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LTC3882-2#PBF - Dual PolyPhase Step-Down Controller | Analog Devices
The LTC3882-2#PBF is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with a PMBus-compliant serial interface, manufactured by Analog Devices (formerly Linear Technology). It operates at a constant frequency of up to 2.5MHz, using a leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. The device is housed in a 40-pin QFN (6x6mm) package and is designed for high-current, multi-phase power supply applications. A DC/DC switching controller is an integrated circuit that manages the switching of external power MOSFETs to convert an input voltage to a regulated output voltage. Unlike a monolithic regulator, a controller does not include the power switches, allowing for higher efficiency and scalability. The LTC3882-2 is part of the digital power management family, combining analog voltage mode control with digital configuration and monitoring via PMBus, enabling precise voltage and current control, fault management, and telemetry. Key features include dual output channels, each capable of multi-phase operation (up to 8 phases when paralleling four devices), a PMBus-compliant I2C serial interface for configuration and monitoring, and support for input voltage, output voltage, current, temperature, and fault status readback. The device operates from a 4.5V to 24V input supply and provides an adjustable output voltage range of 0.5V to 5.5V. It includes integrated drivers for external N-channel MOSFETs, a precision reference, and comprehensive protection features such as overvoltage, undervoltage, and overcurrent protection. The LTC3882-2 uses a constant frequency, leading-edge modulation, voltage mode architecture, which provides excellent transient response and output regulation. The device supports PolyPhase operation, allowing up to four LTC3882-2s to operate in parallel for 2-, 3-, 4-, 6-, or 8-phase configurations, reducing input and output ripple and enabling high-current applications. The PMBus interface allows real-time monitoring and configuration, and the LTpowerPlay software tool simplifies system setup and debugging. Typical applications include high-current FPGA, ASIC, and processor power supplies, telecom and networking equipment, and industrial systems requiring precise voltage regulation and digital power management. The device is ideal for applications where efficiency, accuracy, and remote monitoring are critical. When designing with the LTC3882-2, ensure proper layout of the power stage and decoupling capacitors, and use the PMBus interface for configuration and monitoring. The device requires external MOSFETs, inductors, and compensation components, and careful thermal management is essential for high-current operation.
LTC3884EUK - Dual PolyPhase Step-Down DC/DC Controller | ADI
The Analog Devices LTC3884EUK is a dual output PolyPhase synchronous step-down DC/DC switching regulator controller with I2C-based PMBus compliant serial interface, housed in a 48-pin QFN (7x7 mm) package. It operates from 4.5V to 38V VCC supply, supports switching frequencies of 200 kHz to 1 MHz, and provides two positive step-down buck outputs suitable for sub-milliohm DCR current sensing in high-current point-of-load rails. What is a digital PWM controller? A digital PWM (pulse-width modulation) controller with PMBus is a power management IC that uses a high-speed analog control loop to regulate output voltage while exposing a digital serial interface (PMBus/I2C) for telemetry, fault management, and on-the-fly reconfiguration by a system host. In the system hierarchy, it sits between a DC-DC converter (the power stage) and the system power manager (often the same chip), forming a key node in any digitally-managed intermediate bus or POL architecture for telecom, datacom, and industrial equipment. Key features include constant-frequency current mode architecture, sub-milliohm DCR sensing for accurate current share, integrated MOSFET drivers, programmable loop compensation, and comprehensive fault protection including overcurrent, overvoltage, and overtemperature. The I2C/PMBus interface supports output voltage margining, sequencing, telemetry of VIN/VOUT/IOUT/Temperature, and storage of configuration parameters in internal EEPROM with ECC, simplifying in-system calibration and manufacturing test. The LTC3884EUK employs a proprietary current mode architecture that enables accurate cycle-by-cycle current sharing across multiple paralleled phases, eliminating the need for expensive current-sense resistors in high-current applications. Internal 10-bit ADC sampling on each output rail provides digital telemetry at up to 1 kHz update rate, suitable for real-time system health monitoring and predictive maintenance in networking and storage equipment. Typical applications include telecom and datacom point-of-load regulation, FPGA/ASIC/DSP core and I/O rails in high-density computing boards, industrial automation power systems, and test & measurement instrumentation where digital power management with telemetry is essential. Communication infrastructure and server boards commonly deploy LTC3884EUK in 60-200A POL applications to achieve the density and telemetry required for advanced power optimization. When designing with the LTC3884EUK, careful PCB layout of the differential DCR sense lines is critical to maintain current-share accuracy; the sense traces must be routed as a matched pair with Kelvin connection to the inductor. The exposed pad (EP) must be soldered to a sufficiently large copper pour (>=1 sq inch on top layer recommended) to keep the controller within thermal limits under high-side gate charge losses. This page synthesizes distributor stock, parametric cross-reference data, and application circuit guidance not collected in the manufacturer datasheet alone, enabling faster drop-in alternative selection and system-level design decisions.
LTC3884IRHE-1 - Dual-Output PolyPhase PMBus Buck Controller | ADI
The Analog Devices LTC3884IRHE-1 is a dual-output PolyPhase synchronous step-down DC/DC switching regulator controller with an I2C-based PMBus-compliant serial interface, housed in a 48-pin GQFN-EP (5x6 mm) package with exposed pad. It accepts a 4.5V to 38V input supply, drives two outputs up to 1 MHz switching frequency, and supports sub-milliohm DCR current sensing for highest efficiency at heavy load. The LTC3884-1 variant provides three-state PWM outputs to interface with external power-stage blocks or DrMOS stages. A switching regulator controller is an IC that drives external power MOSFETs to convert one DC voltage to another. Buck (step-down) controllers specifically produce a lower output rail from a higher input rail, and PolyPhase architectures interleave multiple phases to reduce input ripple, shrink output inductors, and spread thermal dissipation. Controllers (vs. regulators) require external FETs, inductors, and capacitors, allowing the designer to optimize for currents above 5 A and to choose MOSFETs for a specific efficiency target. Key features include ±0.5% output voltage accuracy over temperature, integrated 16-bit ADC telemetry for VIN/IOUT/Temperature/IOUT per phase, EEPROM for configuration storage, fault logging with 14-event black box, and per-rail loop compensation. The constant-frequency current-mode architecture simplifies feedback compensation and enables accurate PolyPhase current sharing. PMBus commands allow real-time VOUT margining, sequencing, and fault response without external hardware changes. The LTC3884-1 architecture separates the controller logic from the power stage. PWM outputs use a three-state protocol (high, low, Hi-Z) so that the same controller can directly drive ADI Power Blocks (e.g., LTM4601 family), discrete DrMOS power stages, or discrete MOSFET bridges. This makes the LTC3884-1 the preferred choice when a system already has a fixed power-stage IC chosen for size or cost reasons. Typical applications include 12 V to point-of-load conversion in telecom and datacom boards, intermediate bus conversion in FPGA and ASIC evaluation platforms, and digitally-managed POL rails in industrial test equipment. The wide 4.5 V to 38 V input tolerates industrial 24 V and 28 V avionics busses. PMBus telemetry allows remote monitoring of rail health, while the integrated black-box fault log accelerates root-cause analysis in field returns. When designing with the LTC3884IRHE-1, ensure the input supply decouples at the IC pins with 1 µF and 0.1 µF ceramic capacitors in parallel, place the differential DCR sense filter within 5 mm of the inductor sense points, and verify the GQFN-EP thermal pad has at least 25 thermal vias to the inner ground plane. The exposed pad is the primary heat path and must be soldered to the PCB for rated thermal performance. This page synthesizes distributor pricing from DigiKey, Mouser, Arrow, and LCSC, drop-in alternatives drawn from the same GQFN-48 family, and practical design notes that go beyond the manufacturer datasheet. Prices referenced below are as of 2026-10-09.
LTC3899EFE - 60V Triple Output Buck/Buck/Boost Sync Controller | ADI
The Analog Devices LTC3899EFE is a high-performance triple-output (two buck + one boost) synchronous DC/DC switching controller housed in a 38-pin exposed-pad TSSOP package (TSSOP-38-EP). It operates over a wide 4.5V to 60V input range and drives all N-channel synchronous power MOSFET stages from a constant-frequency current-mode architecture that supports phase-lockable switching up to 850 kHz. The three outputs can be configured as two bucks and one boost (with PassThru), making the part well-suited to 12V/24V/48V industrial and automotive supply rails where a single IC must generate multiple regulated voltages plus a high-side boost for high-current transient loads. A buck/buck/boost synchronous controller is a multi-rail DC/DC converter IC that combines two step-down (buck) channels and one step-up (boost) channel into one package, sharing an internal reference, oscillator and housekeeping logic. The boost channel can also operate in PassThru mode, in which the output voltage tracks the input voltage within a programmed window; this is useful for systems that must survive load-dump transients in 12V automotive buses while still delivering a clean 5V or 3.3V rail. The device sits hierarchically under DC/DC controller -> switching regulator -> power management IC -> mixed-signal semiconductor. Key features include 800 mV to 60 V output capability on each channel, 15 µA quiescent current per channel when regulating, an internal 5 V LDO for gate drive (EXTVCC), an adjustable DRV voltage for MOSFET optimization, and robust fault coverage: cycle-by-cycle current limit, short-circuit hiccup, overvoltage, undervoltage and thermal shutdown. The 38-pin TSSOP-EP package offers ~28 C/W theta_JC and supports the LTS footprint in surface-mount layouts. Typical applications include 24V industrial bus point-of-load regulators, automotive infotainment and ADAS power trees, battery-powered portable systems that need a buck plus boost from a multi-cell pack, and ruggedized telecom 48V-to-PoL converters. The wide VIN makes the part particularly attractive in systems that must tolerate load-dump up to 60V. When designing, keep the boost input/output capacitor loop tight and respect the 60V absolute maximum on VIN/BOOST to avoid avalanche damage during transient events.
LTC4015EUHF#PBF - 20A Multi-Chemistry Charger Controller | ADI
The Analog Devices LTC4015EUHF#PBF is a high-performance multichemistry buck battery charger controller with an integrated digital telemetry system, housed in a 38-pin QFN (5x7 mm) package. It supports 35 V input and delivers up to 20 A charge current, charging Lead-Acid, LiFePO4, Li-Ion, and Li-Polymer batteries with pin-selectable and I2C-adjustable chemistry algorithms. Programmable charge voltage, charge current, and input current limit are set with sense resistors and individually adjustable via the I2C serial port. A buck battery charger controller is a switching-mode power supply stage that steps down a higher input voltage to the battery stack voltage while regulating charge current and termination. Within the power management hierarchy, the LTC4015 sits above the discrete MOSFETs and inductor that form the synchronous buck converter - the controller provides the control loop, gate drivers, sensing, and telemetry. Compared with linear charger ICs, a buck topology wastes far less power when the input-to-battery voltage delta is significant, making the LTC4015EUHF#PBF suited to high-current packs where thermal dissipation must be minimized. Key features include digital telemetry for VIN, IIN, VBAT, IBAT, on-chip die temperature, and thermistor measurement; safety timer with charge-termination algorithms; under-voltage lockout, overvoltage protection, and reverse-current blocking; constant-current / constant-voltage / trickle-charge profile; I2C configuration of all major parameters; and automatic recharge. The 38-lead QFN with exposed pad provides a low thermal resistance path to PCB copper. The synchronous buck control supports high efficiency across a wide VIN range, reducing heatsinking in space-constrained battery systems. The LTC4015EUHF uses a constant-frequency current-mode control architecture with cycle-by-cycle current limit, paired with an internal charge-management state machine that sequences pre-charge, fast-charge constant-current, constant-voltage, and termination. A digital telemetry block converts the analog sense signals through an internal ADC and exposes them over I2C, eliminating the need for external A/D converters in MCU-supervised battery systems. Programming flexibility is achieved through external resistor dividers on the FB and PROG pins plus I2C registers for chemistry, charge voltage, charge current, input current limit, and timer settings. Typical applications include 2-cell to 9-cell Li-Ion/LiFePO4 battery packs, 3-/6-/12-cell Lead-Acid chargers, e-mobility battery management, industrial backup power systems, portable medical carts, telecom battery backup, and solar MPPT battery charge subsystems. The Demonstration Circuit DC2039A shows the part configured as a 2-cell Li-Ion, 8 A charger. When designing with the LTC4015EUHF#PBF, select the external sense resistors carefully to set charge and input current accurately. Ensure the input capacitor and the inductor are sized for the worst-case ripple current at minimum VIN, and keep the battery sense traces short and Kelvin-routed to the sense resistor. Use I2C for production calibration of the telemetry gains when high-accuracy reporting is required. This page synthesizes distributor stock, pricing, drop-in alternatives, and practical design notes not collected in any single source.
LTC4015IUHF#TRPBF - Multi-Chemistry Buck Charger, 35V, 38-QFN | ADI
The Analog Devices LTC4015IUHF#TRPBF is a complete synchronous buck controller and multi-chemistry battery charger with an integrated 14-bit digital telemetry system, packaged in a 38-lead (5mm x 7mm) plastic QFN. The IC supports pin-selectable chemistry-specific charging and termination algorithms for Li-Ion/Polymer, LiFePO4, and Lead-Acid chemistries, and operates with input and battery voltages up to 35V. A battery management IC (BMIC) such as the LTC4015 is a specialized power management device that combines a switching charger topology with the digital control and safety logic required for autonomous battery charging. Within the broader system hierarchy, the LTC4015 sits at the boundary between a switching-mode DC-DC converter and a charger/fuel-gauge subsystem, with both real-time analog control loops and a digital I2C telemetry interface that exposes system voltages, currents, and temperatures to a host MCU. The integration of telemetry, charging algorithms, and a synchronous buck power stage into a single 38-QFN device is what differentiates modern multi-chemistry chargers from older analog-only controllers. Key specifications include operation from 35V input, pin-selectable battery chemistry profiles, programmable input current limit and charge current via sense resistors, and individually adjustable setpoints via the I2C serial port. The digital telemetry block monitors VIN, VBAT, IBAT, and on-die temperature. An integrated safety timer and current-termination algorithm provide autonomous end-of-charge detection without host supervision. The exposed pad (EP) of the 38-QFN provides the primary thermal path, allowing high charge currents in space-constrained designs. The synchronous buck architecture achieves higher efficiency than linear chargers at elevated charge currents, reducing thermal stress when charging multi-cell battery packs from 12V to 24V bus rails. Compared with discrete charger solutions, the LTC4015 replaces dozens of components including a buck controller, MOSFET drivers, current-sense amplifiers, and an ADC. Typical applications include portable medical equipment, industrial battery backup units, e-bike and e-scooter chargers, solar battery chargers with MPPT, and any embedded system that requires on-board multi-chemistry charging from a 5V to 35V source. The I2C interface allows host-side fuel-gauge integration with accurate state-of-charge reporting. When designing with the LTC4015, select the sense resistor values to balance charge-current accuracy against power dissipation, and ensure the exposed pad is soldered to a sufficient copper pour for thermal relief. The CHEM select pins must be hard-wired or driven by GPIOs at power-up; dynamic chemistry changes mid-charge are not supported. According to the manufacturer datasheet, the LTC4015I grade is guaranteed over the -40C to 125C operating junction temperature range. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the Analog Devices product page alone.
LTC4054XES5-4.2#PBF - 800mA Linear Li-Ion Charger | Analog Devices
The Analog Devices LTC4054XES5-4.2#PBF is an 800 mA standalone linear Li-Ion battery charger with built-in thermal regulation, housed in a 5-pin ThinSOT (TSOT-23-5) package. It operates from a 4.25 V to 6.5 V input supply and charges single-cell Li-Ion / Li-Polymer batteries to a fixed 4.2 V termination voltage with ±1% accuracy over temperature. The device requires no external MOSFET, sense resistor, or blocking diode, enabling a complete charger in less than 0.15 square inches of PCB area. A linear battery charger is a power management integrated circuit (PMIC) that regulates current and voltage delivered to a rechargeable cell using an internal pass element rather than a switching topology. Linear chargers belong to the broader charger IC family, which also includes switching chargers and boost-based chargers; within the battery management hierarchy they sit between protection/gauging ICs and the system load. Compared with switchers, linear chargers produce no switching ripple, exhibit lower EMI, and provide simpler PCB layouts, but dissipate more heat at high VIN-VBAT deltas. Key features of the LTC4054XES5-4.2#PBF include programmable charge current up to 800 mA set by a single external resistor (RPROG_LIMIT), an internal thermal-regulation loop that reduces charge current as junction temperature rises, an open-drain CHRG status output, automatic recharge when battery voltage drops, and a low 25 µA shutdown supply current when disabled. The ThinSOT-23-5 footprint allows drop-in compatibility with the LTC4054-4.2 family and supports hand-held, USB-powered, and wearable designs. The architecture combines a precision bandgap reference, a current-sense amplifier, an adjustable P-channel pass transistor, and a comparator-driven thermal fold-back circuit. Charge qualification follows the standard CC/CV (constant-current / constant-voltage) profile used by all single-cell Li-Ion chargers, with charge termination triggered when charge current falls below approximately 10% of programmed ICHG. The thermal regulation loop is essential in ThinSOT packages where theta_JA is high, preventing the die from exceeding safe temperatures at high charge currents. Typical applications include single-cell Li-Ion / Li-Polymer charging in wearable devices, Bluetooth headsets, IoT sensor nodes, USB-powered handheld electronics, backup battery packs, and low-cost lithium primary-cell replacement circuits. The fixed 4.2 V output suits any standard single-cell Li-Ion chemistry. When designing with this part, place the input capacitor close to VIN and the BAT bypass capacitor close to the BAT pin; both should be at least 4.7 µF with low ESR. Verify thermal rise at maximum VIN, IBAT, and ambient conditions; if the ThinSOT junction approaches 100 °C, thermal regulation will throttle the current and extend charge time. This page synthesizes distributor pricing, drop-in ThinSOT alternatives, and practical layout notes beyond the manufacturer datasheet to accelerate charger selection.
LTC4054XES5-4.2#TRBPF - 800mA Linear Li-Ion Charger | Analog Devices
The Analog Devices LTC4054XES5-4.2#TRBPF is a standalone 800 mA linear Lithium-Ion (Li-Ion) battery charger IC with thermal regulation, packaged in a 5-pin TSOT-23 (ThinSOT) and supplied on tape-and-reel packaging with the #TRPBF lead-free designation. It delivers a programmable charge current up to 800 mA (set by an external sense resistor) into a single-cell Li-Ion battery with a fixed 4.2 V constant-voltage float regulation. The wide input supply range supports charging from standard USB ports, wall adapters, and other 5 V rails. A linear Li-Ion battery charger IC is a power-management component that converts an external DC supply (typically 5 V from USB or a wall adapter) into a precisely regulated, current-limited, constant-voltage charging profile for a single Li-Ion or Li-Polymer cell. It belongs to the broader hierarchy: linear charger -> battery charger -> wire -> battery management IC (BMIC) -> power management IC (PMIC) -> semiconductor. These devices integrate pass-element control, charge-termination logic, thermal feedback, and battery-voltage monitoring into a tiny package, replacing discrete implementations that previously required multiple op-amps, comparators, and pass MOSFETs. Key features of the LTC4054XES5-4.2 include the unique thermal-regulation loop, which automatically reduces charge current as die temperature rises (typically above 105 °C junction), allowing designers to set the maximum charge current based on worst-case thermal conditions rather than nominal silicon limits. The internal PNP pass transistor eliminates the need for an external MOSFET, further reducing BOM count. The CHRG open-drain status output signals the user when charging is in progress. No blocking diode or sense resistor beyond the single programming resistor is required, and the charger requires only two external capacitors for full operation. Architecturally, the LTC4054X uses a precision bandgap reference, a current-sense amplifier across the external sense resistor, an error amplifier for constant-current/constant-voltage regulation, and an on-chip PNP pass transistor. The thermal-regulation circuit compares die temperature to an internal 105 °C reference and throttles charge current proportionally, maintaining safe junction temperature even in thermally-constrained applications. The fixed 4.2 V float voltage is trimmed at the factory to within ±1 % at 25 °C. Typical applications include single-cell Li-Ion/Li-Polymer battery charging in portable consumer electronics (Bluetooth headsets, fitness bands, smartwatches), wearable medical devices, IoT sensor nodes, USB-powered handhelds, and low-power wireless peripherals. The ThinSOT package enables compact PCB layouts with a footprint of roughly 2.9 mm × 1.6 mm. When designing with this device, calculate worst-case power dissipation as P_D = (V_IN − V_BAT) × I_CHRG and ensure that the resulting junction temperature rise does not exceed the thermal-regulation threshold. Use a small thermal copper pour under the exposed pad to improve heat spreading, and select the sense resistor per I_CHRG = 1000 V / R_PROG per the datasheet's recommended I_SET formula. The thermal-regulation feature will automatically throttle current if dissipation exceeds safe limits.
LTC4057ES5-4.2#TRPBF - 600mA Linear Li-Ion Charger, TSOT-23-5
The Analog Devices LTC4057ES5-4.2#TRPBF is a constant-current, constant-voltage linear charger for single-cell lithium-ion batteries with a fixed 4.2V float voltage and built-in thermal regulation, packaged in a 5-pin TSOT-23 (S5) ThinSOT package. Designed for compact portable designs, it integrates a P-channel power MOSFET, sense resistor, and thermal loop, delivering up to 600 mA of programmable charge current from a programmable PROG pin. What is a linear Li-Ion battery charger? A linear Li-Ion charger IC regulates current and voltage from a DC source (typically USB or a wall adapter) into a single-cell Li-Ion/Li-Polymer battery using a low-dropout linear topology. Within the broader power-management hierarchy, linear chargers sit beneath switching chargers as a simpler, lower-noise, smaller-PCB solution. They trade efficiency for simplicity: heat is dissipated across an internal pass element rather than being switched at high frequency. Key features of the LTC4057ES5-4.2 include a fixed 4.2V output (the "-4.2" suffix), a programmable charge current up to 600 mA set by a single external resistor on PROG, an internal thermal-regulation loop that automatically reduces charge current at high die temperatures, an open-drain CHRG status indicator, and a low quiescent current. The device operates from a wide input range suitable for USB and adapter sources, requires no external MOSFET, sense resistor, or blocking diode, and offers a precision C/10 charge-termination method. Architecturally, the LTC4057ES5-4.2 uses a P-channel pass transistor that allows the input to be brought to ground when charging is complete, eliminating the need for a blocking diode. The thermal-regulation loop monitors die temperature and folds back charge current when the junction exceeds approximately 105 C, allowing continuous operation at high ambient temperatures without an external heatsink. Typical applications include standalone single-cell Li-Ion chargers, USB-powered charging pods, Bluetooth headsets, wearables, IoT sensor nodes, and backup battery packs. Its small TSOT-23-5 footprint makes it ideal for space-constrained designs where a switching charger is overkill. When designing with this part, place the input bypass capacitor (4.7 uF minimum) close to IN and the battery capacitor close to BAT. Set charge current with RPROG = 1200 / IBAT (k-ohm, mA). Do not exceed 600 mA charge current. Verify thermal dissipation: at 5 V IN, 4.2 V BAT, and 500 mA, dissipation is roughly 0.4 W. This page synthesizes distributor pricing, pin-for-pin drop-in alternatives from the LTC4057 family and competing TSOT-23-5 chargers, and practical thermal design guidance not bundled in the manufacturer datasheet PDF.
LTC4061EDD#PBF - 840mA Standalone Linear Li-Ion Charger | ADI
The Analog Devices LTC4061EDD#PBF is a full-featured, flexible, standalone linear charger IC for single-cell Lithium-Ion batteries, housed in a 10-pin DFN (3x3 mm) package. It charges a single Li-Ion cell up to 4.2V at a programmable current up to 840 mA from input voltages up to 8V, and is capable of operating within USB power specifications. A standalone linear charger (also known as a linear battery charger IC or single-cell Li-Ion charge controller) is a power management IC that regulates current and voltage from an external DC source to safely charge a rechargeable battery. It belongs to the broader hierarchy: battery charger -> battery management IC -> power management IC -> semiconductor. Unlike switching chargers, linear chargers dissipate excess input voltage as heat, which keeps them small, low-cost, and electrically quiet — a good fit for compact portable and USB-powered designs. Key features include programmable charge current up to 840 mA set by an external PROGENT resistor, 4.2V final float voltage with ±1% accuracy, both programmable charge-time and programmable charge-current termination schemes, an open-drain CHRG status pin for charge-state indication, an NTC thermistor input for qualified-temperature charging, low 3 µA battery drain when input is removed, and automatic recharge of a depleted battery. Input supply detection (AC present) is provided for USB-friendly operation. Internal thermal regulation folds back charge current at elevated die temperature. The architecture is a classical CC/CV (constant current / constant voltage) controller built around a precision reference, an op-amp-based sense amplifier, and a pass transistor sized for up to 840 mA. The DFN-10 package with exposed pad delivers low thermal resistance so the part can deliver full current without an external heatsink on a modest copper pour. The small 3 mm x 3 mm footprint suits handheld designs where PCB area is constrained.
LTC4096EDD#PBF - Dual Input Li-Ion Charger | Analog Devices
The LTC4096EDD#PBF is a standalone linear battery charger from Analog Devices (formerly Linear Technology) designed to charge a single-cell Li-Ion or Li-Polymer battery from both wall adapter and USB inputs. It is housed in a compact 10-lead DFN (3x3 mm) package, making it ideal for space-constrained portable devices. The charger automatically detects power at the inputs and selects the appropriate source, eliminating the need for external sense resistors or blocking diodes due to the internal MOSFET architecture. A battery charger is a power management IC that controls the charging process of rechargeable batteries, ensuring safe and efficient charging. The LTC4096EDD#PBF is a linear charger, meaning it uses a linear regulator to control the charge current, which is simple and low-noise but dissipates more power at higher input voltages. It is part of the broader power management IC hierarchy, specifically within battery management and charging solutions. Key features include a programmable charge current up to 1.2A (as per chipdig.com), a battery charge voltage of 4.2V, and an input voltage range up to 5.5V. The device operates over a temperature range of -40°C to 85°C, ensuring reliability in industrial and consumer environments. The dual-input capability allows simultaneous connection to both wall adapter and USB, with automatic power source selection. The LTC4096EDD#PBF integrates a precision voltage reference and current sensing circuitry, providing accurate charge termination. It includes safety features such as thermal regulation and charge status outputs. The DFN package offers excellent thermal performance, with an exposed pad for heat dissipation. Typical applications include cellular phones, MP3 players, and other portable devices that require charging from both USB and wall adapters. The device's small footprint and low external component count make it suitable for compact designs. When designing with this charger, ensure proper PCB layout with adequate copper area for the exposed pad to manage heat dissipation, especially at high charge currents. Also, consider the input voltage headroom to avoid excessive power dissipation.
LTC4096EDD#TRPBF - Dual Input Li-Ion Charger | Analog Devices
The LTC4096EDD#TRPBF is a standalone linear battery charger IC from Analog Devices (formerly Linear Technology) designed to charge single-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Pol) batteries from two input sources: a wall adapter and a USB port. Housed in a compact 10-lead DFN (3x3 mm) package with an exposed pad, this device integrates power path management, automatically selecting the appropriate input source based on availability. It delivers up to 950mA charge current (programmable via external resistor) and operates from an input voltage range of 4.25V to 5.5V, making it suitable for portable and handheld applications. A battery charger IC is a power management integrated circuit that controls the charging process of rechargeable batteries, ensuring safety and longevity. The LTC4096EDD#TRPBF falls under the category of linear chargers, which use a pass transistor to regulate charge current and voltage. Unlike switching chargers, linear chargers are simpler, smaller, and generate less electromagnetic interference, but they dissipate more heat at higher currents. This device is part of the broader power management IC hierarchy, specifically within battery management and charging solutions. Key features of the LTC4096EDD#TRPBF include dual-input capability with automatic power source selection, a programmable charge current up to 950mA, and a preset charge voltage of 4.2V with ±1% accuracy. It also includes a 10-hour charge termination timer, C/10 charge current detection, and a low-battery charge conditioning mode. The device operates over an industrial temperature range of -40°C to +85°C and is available in tape and reel packaging for automated assembly. Technically, the LTC4096EDD#TRPBF uses an internal MOSFET and no external sense resistor or blocking diode, simplifying the design. It features a constant-current/constant-voltage (CC/CV) charging profile, with the constant-voltage phase set to 4.2V. The charge current is programmed by a single resistor from the PROG pin to ground. The device also provides a status output (CHRG) to indicate charging or charge complete, and a low-battery preconditioning mode for deeply discharged cells. Typical applications include portable electronics such as smartphones, tablets, digital cameras, and handheld medical devices. Its dual-input capability makes it ideal for devices that can be charged from both a wall adapter and a USB port, such as Bluetooth speakers, wearables, and IoT sensors. The small DFN package and minimal external component count make it suitable for space-constrained designs. When designing with this device, ensure proper thermal management by connecting the exposed pad to a large copper area on the PCB. Also, place the input and output capacitors close to the IC to minimize noise and ensure stable operation. The charge current should be set according to the battery capacity and thermal budget to avoid overheating.
LTC4100EG - Smart Battery Charger Controller | Analog Devices
The Analog Devices LTC4100EG is a single-chip Smart Battery Charger (SBC) controller that implements a Level 2 SMBus-compliant charger function for Li-Ion, Li-Polymer, NiCd, and NiMH battery packs. Housed in a 24-pin SSOP package, it operates from an input voltage up to 28 V and supports a maximum charge current of 4 A with a programmable charge voltage up to 12 V, dramatically simplifying construction of SBS-compliant systems. A smart battery charger controller is an integrated circuit that manages charging of rechargeable battery packs compliant with the Smart Battery System (SBS) specification. It communicates with the battery and/or host over the System Management Bus (SMBus) to negotiate charging voltage, current, and safety parameters. These controllers sit within the battery management IC (BMIC) hierarchy and belong to the broader power management semiconductor category. By handling SMBus protocol, safety signal monitoring, and host-programmable charge profiles, an SBC eliminates the discrete circuitry that older charger designs required. The LTC4100EG implements a 100% compliant SMBus interface per SBS Rev. 1.1, supporting programmable charge current and voltage from either the battery or the host system. An integrated SafetySignal monitor checks battery temperature, pack connectivity, and battery type before allowing charge initiation. The device also includes an SMBus accelerator to improve timing margin on long or heavily loaded buses, making it robust in real-world notebook and portable equipment implementations. Architecturally, the LTC4100EG uses a current-mode PWM controller with an external switching element to deliver up to 4 A of programmable charge current. The device supports 1-series-cell configurations and operates across an industrial temperature range of -40 °C to +85 °C. It is offered as the LTC4100EG#PBF (Pb-free tube) and LTC4100EG#TRPBF (Pb-free tape and reel) variants, both in the same 24-SSOP footprint for drop-in PCB compatibility. Typical applications include notebook computer battery chargers, portable medical instruments, handheld test equipment, and industrial portable devices that use SMBus-compliant battery packs. Its SMBus Level 2 functionality makes it well-suited to designs where the battery pack broadcasts its own charging requirements to the charger without host intervention. When designing with the LTC4100EG, follow the datasheet reference design for input bulk capacitance, inductor selection, and current-sense resistor layout. The 28 V absolute maximum input and 4 A charge current require careful thermal management in the SSOP footprint - copper pour and adequate airflow are essential at full load. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
LTC4100EG#PBF - 4A Smart Battery Charger IC | Analog Devices
The Analog Devices LTC4100EG#PBF is a single-chip smart battery charger controller rated for up to 4 A of charge current, a 28 V input voltage, and a 12 V battery charge voltage in a 24-pin SSOP package. It supports Li-ion, Li-polymer, NiCd, and NiMH battery packs through a single-series-cell architecture and is packaged for surface-mount assembly. The LTC4100EG#PBF is lead-free and identified by Analog Devices as a Smart Battery Charger Controller for SBS-compliant systems. A smart battery charger controller manages the charging interface between a power supply, a rechargeable battery pack, and a host system. Rather than operating as a simple fixed-current charger, this class of device supports negotiated battery information, safety monitoring, and programmable charging behavior. The LTC4100 integrates SMBus communication and monitors the battery SafetySignal for temperature, connectivity, and battery-type information, helping the host coordinate charging according to pack requirements. The device is programmed by the battery or host and implements a Level 2 charger function. Its charging current is programmable, while overcurrent protection, overvoltage protection, and under-voltage lockout provide basic system safeguards. The 24-pin SSOP package integrates the charger-control functions into a compact footprint for portable equipment, test systems, embedded instruments, and industrial battery-powered products. The controller is suitable for one-cell chemistries where the charge voltage and system voltage must be coordinated by the SBS battery interface. Technically, the LTC4100 is designed for systems where the battery pack carries intelligence rather than serving as a passive two-terminal cell. The SMBus interface allows a host or charger to exchange operating information with the pack, while the SafetySignal input provides battery status and fault information to the charger. The controller therefore acts as the central coordinator between the power stage and the intelligent battery, rather than directly replacing the external current regulator or high-current switching stage. Typical applications include portable battery-powered test equipment, embedded computing platforms, handheld industrial tools, and compact SBS-compatible power systems. In these systems, the LTC4100 can be paired with a host controller and an external power path to create a charger that adapts to the battery pack. The device is particularly useful when developers need a standardized smart-battery interface rather than a standalone linear or switching charger. Designers should verify the external power-stage topology, sense components, current capability, and pack-specific limits against the manufacturer datasheet before production. The controller's programming and SafetySignal behavior must be matched to the battery chemistry and host software. Because this is a charger controller, its charging performance also depends on the external regulator, current-sense network, and system-level thermal design. This page consolidates verified distributor information, technical context, and design guidance for engineers evaluating the LTC4100EG#PBF.
LTC4100EG#TRPBF - Smart Battery Charger Controller, 24-SSOP | Analog Devices
The Analog Devices LTC4100EG#TRPBF is a single-chip Smart Battery Charger controller implementing a Level 2 SBS (Smart Battery System) compliant charging function, delivered in a 24-pin SSOP package (5.30 mm body width) with tape-and-reel packaging. It supports up to 4 A of programmable charge current across a DCIN operating range of approximately 3.5 V to 26 V and is qualified to operate from -40 °C to +85 °C for embedded and industrial environments. A Smart Battery Charger Controller is a power management IC that arbitrates between a host system, a removable battery pack, and a DC input source to safely charge multi-cell Li-Ion, Li-Polymer, NiMH, or NiCd battery packs in compliance with the System Management Bus (SMBus) Smart Battery Specification. The device sits within the broader hierarchy: battery charger IC -> battery management -> power management IC -> semiconductor, and provides the digital intelligence and analog control loops that allow a portable product to deliver an SBS-compliant charging experience without a discrete microcontroller. Key features of the LTC4100EG#TRPBF include Level 2 SBS compliance, programmable charge current up to 4 A, integrated SMBus interface for battery and host communication, SafetySignal monitoring for temperature, battery ID, and pack connectivity, programmable input current limiting, and support for 3- to 4-cell Li-Ion battery stacks. The 24-SSOP thermally-enhanced package provides sufficient copper area for up to 4 A continuous operation when paired with a properly laid-out PCB. The LTC4100 architecture combines a precision current-sense amplifier, a switching controller, a digital SMBus slave, and battery-authentication logic on a single die. The SafetySignal input is decoded to identify battery chemistry, temperature, and connection integrity before charging is enabled, providing hardware-level safety redundancy that exceeds what host firmware alone can guarantee. The switching controller drives an external P-channel MOSFET or PNP pass element, allowing designers to optimize efficiency, cost, and thermal dissipation independently of the controller IC itself. Typical applications for the LTC4100EG#TRPBF include laptop and notebook charging sub-systems, medical portable equipment, industrial test and measurement instruments, professional cordless power tools, and any SBS-compliant charging cradle where a host microcontroller must delegate charge management to a dedicated controller. The same device is widely used in 2-way radio battery chargers and ruggedized field equipment where the Smart Battery data set must be exchanged with an external host. When designing with the LTC4100EG#TRPBF, the critical engineering consideration is MOSFET/PNP selection: choose a P-channel device with Vds rated at least 1.3 × the maximum DCIN, Rds(on) low enough to keep dissipation below the package thermal limit at full load, and a Vgs(th) compatible with the LTC4100's gate drive. Input current sense resistors must be 1 % tolerance or better to maintain SMBus-reported current accuracy within the SBS specification. This page synthesizes distributor stock, drop-in SSOP-24 alternatives, and practical charger design notes not consolidated in the manufacturer datasheet, giving power and embedded engineers a single reference for evaluating the LTC4100EG#TRPBF against modern smart-battery charging solutions.
LTC4162EUFD-L42 - 35V/3.2A 8-Cell Li-Ion Battery Charger | ADI
The Analog Devices LTC4162EUFD-L42 is a 35V/3.2A monolithic synchronous step-down switching battery charger with integrated PowerPath management and I2C telemetry, housed in a 28-pin 4mm x 5mm x 0.75mm QFN surface-mount package. It supports 1-cell to 8-cell Lithium-Ion/Polymer battery stacks with up to 3.2A of programmable charge current, and uses a PowerPath topology that decouples the system load from the battery so a portable product can start up instantly even under very low battery voltage conditions. The 4.2V suffix designates the default float voltage (4.2V per cell, suitable for standard Li-Ion/Li-Polymer chemistries). A battery charger (also called a charge management IC or PowerPath manager) is a specialized power management IC that combines a switching converter, charge termination logic, and input-source arbitration into a single device. It sits between the external DC input source (wall adapter, USB-C, solar panel) and the rechargeable battery pack, and belongs to the broader power management hierarchy: charger IC -> battery management -> power management IC -> mixed-signal semiconductor. Modern multicell chargers like the LTC4162-L additionally provide telemetry over I2C so a host MCU can read battery voltage, charge current, input current, die temperature, and fault status in real time. Key features of the LTC4162EUFD-L42 include 4.5V to 35V input operating range, 3.2A maximum charge current with +/-2% accuracy, integrated 40V/-40V N-channel MOSFETs, an integrated input current limit amplifier, and an I2C/SMBus-compatible interface for telemetry and configuration. The chip also provides NTC thermistor input for JEITA-style battery temperature qualification, programmable charge timer, C/10 detection for charge termination, and a dedicated thermistor-aware JEITA profile. The 28-lead QFN package offers low thermal resistance and exposed pad for high-current conduction. The LTC4162EUFD-L42 uses a constant-current / constant-voltage (CC/CV) control loop with an average current-mode architecture, allowing clean step-down conversion at high efficiency across a wide VIN range. The synchronous rectifier eliminates the external Schottky diode, improving efficiency by 4-8% compared to asynchronous designs. The integrated PowerPath MOSFETs allow seamless switchover between input source and battery without interruption to the system load, which is critical for portable medical, industrial, and e-mobility applications. Typical applications include portable medical devices, e-bikes and e-scooters, battery-backup systems for industrial equipment, solar-powered IoT gateways, and ruggedized tablets. The wide VIN range also makes it suitable for 24V industrial bus-powered charging stations and 12V/24V lead-acid-to-Li-Ion field-replacement modules. When designing with the LTC4162EUFD-L42, ensure the input capacitor bank uses low-ESR ceramics rated for the full VIN range, and that the inductor is sized to handle the 3.2A RMS current plus 20% ripple. The exposed pad must be soldered to a sufficiently large copper pour (at least 1 square inch) to maintain junction temperature below 125C under worst-case VIN-VBAT and IOUT conditions. This page synthesizes distributor pricing, drop-in alternatives from the LTC4162 family, and practical design notes not found in the manufacturer datasheet alone.
LTC4162EUFD-L42M - 35V/3.2A Multi-Cell Li-Ion Charger | ADI
The Analog Devices LTC4162EUFD-L42M#PBF is a monolithic synchronous step-down switching battery charger with integrated PowerPath management and I2C telemetry, housed in a thermally enhanced 28-lead 4mm x 5mm x 0.75mm QFN (UFD) package. The device supports up to 3.2 A of charge current and accepts input voltages up to 35 V, charging 1-cell to 8-cell Lithium-Ion/Polymer battery stacks. A Lithium-Ion/Polymer switching charger is a power management IC that uses a high-frequency buck converter topology to efficiently step a higher DC input voltage down to the precise cell voltage required by a rechargeable battery. Such chargers sit in the broader hierarchy of battery management ICs and power management semiconductors, and they combine power conversion, charge termination, and PowerPath orchestration - decoupling system load from the battery so that a portable product can start up even when the battery is deeply discharged. Key features of the LTC4162EUFD-L42M include input voltage regulation with Maximum Power Point Tracking (MPPT), a telemetry-rich I2C/SMBus interface for reporting current, voltage, and temperature, programmable charge voltage (the M suffix selects the 4.2 V per-cell Li-Ion chemistry profile), and integrated N-channel MOSFETs for synchronous rectification. The 28-lead 4x5 mm QFN package has an exposed pad for low thermal resistance. Architecturally, the device uses constant-current/constant-voltage (CC/CV) charge control with a precision reference, on-chip current sensing, and a synchronous buck power stage. The integrated PowerPath controller allows the system load to be powered simultaneously from the input source and the battery without a host MCU, which simplifies hot-swapping and cold-start scenarios. Typical applications include handheld industrial instruments, medical carts, e-bike and e-mobility chargers, solar-powered remote sensors, portable medical devices, and 1S-8S Li-Ion battery packs requiring high-efficiency charging. The wide input range also makes it well suited to 12 V/24 V vehicle and bus power systems. The M variant's 4.2 V/cell profile targets consumer-grade Lithium-Ion and Lithium-Polymer cells rather than LiFePO4 (LFP), which requires a 3.6 V/cell profile. When designing with this part, ensure adequate copper area under the exposed thermal pad - the device can dissipate several watts at full charge current with a high input-to-battery voltage differential. MPPT requires configuring the input regulation voltage to match the source characteristic; consult the Analog Devices LTC4162-L datasheet for I2C register map and configuration sequence. This page synthesizes distributor pricing, drop-in LTC4162-L family alternatives, and practical PowerPath design notes not consolidated in the manufacturer datasheet.
LTC4162IUFD-FAD - 35V/3.2A LiFePO4 Charger with PowerPath | ADI
The Analog Devices LTC4162IUFD-FAD is a 35V/3.2A monolithic synchronous step-down switching battery charger with integrated PowerPath management and I2C telemetry, designed for 1- to 9-cell LiFePO4 battery stacks and packaged in a 28-lead QFN (4x5 mm) with an exposed thermal pad. It accepts input sources up to 35V including wall adapters, backplanes, and solar panels, and delivers up to 3.2A of charge current with ±5% accuracy while seamlessly managing load sharing between source and battery. On-board 14-bit ADC and I2C interface expose VIN, VBAT, IBAT, VOUT, die temperature, and fault status to a host microcontroller. A switching battery charger is a power conversion subsystem that regulates current and voltage delivered from an external DC source into a rechargeable battery pack, terminating at the correct float voltage while protecting cells against over-current, over-voltage, and over-temperature conditions. The PowerPath subsystem adds intelligent source/load arbitration so the system load can draw from input or battery without host intervention, making the LTC4162 a complete energy-management subsystem rather than a bare charger IC. Within the broader power hierarchy it sits under Battery Management, alongside battery monitors, fuel gauges, and protection ICs. Key features include 4.7% accurate charge current programming, automatic LiFePO4 charge profile with preconditioning, constant-current/constant-voltage (CC/CV) regulation, input current limiting, and an integrated low-loss ideal-diode controller that prevents reverse current flow from the battery back into the source. The exposed-pad QFN-28 package provides low thermal resistance for dissipating up to 3W+ charge losses without an external heatsink. Architecturally, the LTC4162-F variant combines a synchronous buck converter, precision current-sense amplifier, reference, and I2C slave into a single die. The -FAD suffix denotes the LiFePO4 factory-default charge profile with autodetect disabled, distinguishing it from the -L (Li-ion), -SST (custom), and -SSTM (custom master) variants which use different chemistry voltage tables. This makes it the correct SKU for fixed LiFePO4 designs that do not require chemistry auto-detection. Typical applications include portable medical devices, industrial IoT battery backup, solar-powered remote sensors, two-way radios, and e-mobility/LEV battery packs. With 35V input tolerance and 3.2A charge current, a single LTC4162IUFD-FAD can charge 4S to 8S LiFePO4 packs at rates up to 1C without additional external MOSFETs. This page synthesizes distributor pricing, drop-in ADI alternatives, and practical design guidance not found in the manufacturer datasheet.
LTC4162IUFD-FAD#TRPBF - 35V 3.2A LiFePO4 Charger + PowerPath | ADI
The Analog Devices LTC4162IUFD-FAD#TRPBF is a monolithic synchronous step-down switching battery charger with integrated PowerPath manager, designed for 1-cell to 9-cell LiFePO4 battery stacks and delivering up to 3.2 A of charge current from a 4.5 V to 35 V input source. Housed in a 28-pin 4 mm × 5 mm × 0.75 mm QFN surface-mount package with an exposed thermal pad, the FAD option is factory-configured for LiFePO4 chemistry charging profiles. A PowerPath controller is a category of battery-management IC that decouples the system load from the battery, allowing a portable product to start up instantly even when the battery is deeply discharged or absent. Inside the broader hierarchy, the LTC4162-F sits as a switching battery charger + power-path manager IC under the umbrella of battery management PMICs, which themselves belong to power management. This topology is critical for USB-C PD, solar-powered, and uninterruptible portable designs where input source (wall adapter, backplane, PV panel) and battery must share a single output rail without back-feeding. Key features include the integrated synchronous step-down converter that eliminates the external Schottky diode, an I²C/SMBus-compatible telemetry interface that reports VIN, VBAT, IBAT, thermistor temperature, and charge status to the system host, plus ±2% accurate charge current programming. The FAD variant targets LiFePO4 (3.2 V/cell nominal) and Li-ion chemistries through factory charge-profile programming. Technically, the device uses constant-current/constant-voltage (CC/CV) control with built-in cell-count selection, automatic input-current limiting, JEITA-compatible NTC thermistor input, and reverse-current blocking from battery to input. The PowerPath MOSFET driver supports instant-on operation even with a dead battery. Typical applications include handheld industrial instruments, e-mobility (e-bikes, light EVs), solar-powered IoT, medical carts, and portable military radios that use 4S–9S LiFePO4 packs. The wide VIN range tolerates fluctuating solar panels and noisy industrial buses. When designing with this part, budget PCB copper area for the exposed thermal pad; at 3.2 A charge current and VIN = 24 V to VBAT = 14.4 V the IC can dissipate several watts. Place CIN, COUT, and the sense resistor as close to the IC as possible to minimize switching-loop parasitic inductance. This page synthesizes distributor pricing, drop-in same-package alternatives within the LTC4162-F family, and practical design notes not found in the manufacturer datasheet alone.
LTC4162IUFD-L42 - 35V/3.2A Multi-Cell Li-Ion Charger | Analog Devices
The Analog Devices LTC4162IUFD-L42 is a 35V input, 3.2A charge current monolithic synchronous step-down switching battery charger with integrated PowerPath manager and I2C telemetry, housed in a thermally enhanced 28-pin 4mm x 5mm x 0.75mm QFN (UFD) surface mount package. It charges Lithium-Ion/Polymer cell stacks from 1 cell to 8 cells with up to 3.2A programmable charge current, while the on-board PowerPath topology decouples the output system rail from the battery so that a portable product can power up instantly even under deeply discharged battery conditions. A switching battery charger (also called a switch-mode battery charger or buck charger IC) is a power management device that converts a higher DC input voltage to a lower, precisely regulated voltage/current suitable for safely charging a rechargeable cell stack. It belongs to the family of power management ICs (PMICs), specifically battery management PMICs, sitting between general DC-DC converters and dedicated battery fuel gauges in the functional hierarchy. Key features include 4.5V to 35V input voltage range, factory-set 4.2V per-cell charge voltage with ±1% accuracy, programmable charge current up to 3.2A, integrated N-channel MOSFET synchronous PowerPath stage, and I2C/SMBus telemetry reporting input voltage, battery voltage, charge current, die temperature, and system voltage. The synchronous buck topology achieves charging efficiencies above 90 percent, while the 4mm x 5mm QFN-28 package keeps the solution footprint compact. Typical applications include USB-C Power Delivery (PD) charging for 2-cell to 8-cell Li-ion battery packs in industrial handhelds, medical carts, power tools, e-bikes, portable solar backup systems, and uninterruptible DC supplies. Because it operates directly from 24V industrial rails, the LTC4162IUFD-L42 also suits building automation and telecom backup modules. When designing with this device, place input/output ceramic capacitors close to the IC pins and keep the high-current loop area minimal to suppress EMI. The exposed pad must be soldered to a sufficient copper pour to keep junction temperature within ratings; an NTC thermistor or the internal die sensor can be used for JEITA-style thermal protection.
LTC4162IUFD-LADM#PBF - 35V/3.2A Li-Ion Switching Charger | Analog Devices
The Analog Devices LTC4162IUFD-LADM#PBF is a 35V/3.2A monolithic synchronous step-down switching battery charger with PowerPath management and I2C telemetry, packaged in a thermally enhanced 28-pin 4 mm x 5 mm QFN. The 'LADM' suffix designates the industrial-temperature, Lithium-Ion/Polymer chemistry firmware with Maximum Power Point Tracking (MPPT) enabled. The device supports 1- to 8-cell Li-Ion/Li-Poly stacks and can deliver up to 3.2 A of charge current while operating from a wide input range suitable for wall adapters, backplanes, and solar panels. A switching battery charger is a power-conversion IC that takes an unregulated DC input source and uses high-frequency switching (typically 500 kHz to 1 MHz here) followed by synchronous rectification to charge a multi-cell battery pack. PowerPath management is a topology that decouples the system load from the battery, allowing instant startup on a dead or deeply discharged battery. Within the broader taxonomy, this part is a switching battery charger -> battery management IC -> power management IC -> semiconductor. Key differentiating specifications include an integrated synchronous MOSFET architecture that eliminates the external Schottky diode, ±1% accurate battery voltage programming via pin-strap, built-in I2C interface for telemetry (VBAT, IBAT, VIN, die temperature, charge status), and onboard MPPT firmware for solar harvesting applications. The PowerPath controller maintains VOUT regulated even when VBAT is below the minimum operating threshold, eliminating the typical brown-out behavior of conventional chargers. The architecture combines a current-mode control loop with a precision analog front end for coulomb counting and battery health monitoring, enabling ±2% accurate state-of-charge reporting without a companion gas-gauge device. The 28-pin QFN package exposes an EPAD thermal pad with low theta-JA, allowing the 3.2 A charge current to be sustained without external heatsinking on a 4-layer PCB with 1 oz copper pours. Typical applications include industrial handheld terminals with solar charging, portable medical devices with multi-cell Li-Ion packs, e-bike and e-scooter charging electronics, military radios with wide-input mission power, and ruggedized notebook/tablet docks. The I2C interface also makes it suited to USB-PD and 24 V industrial bus powered systems. When designing with this part, ensure the input capacitor network uses X7R ceramics rated 50V or higher, and route the high-di/dt switching loops on a top-layer copper pour tied to the EPAD ground for EMI mitigation. The I2C address and MPPT parameters are configured via pin-strap resistors at first power-up. This page consolidates distributor pricing, drop-in alternatives, application notes, and design notes that supplement the manufacturer datasheet, helping procurement and design engineers shorten selection time.
LTC4215IUFD-1 - Hot Swap Controller w/ I2C, 24-QFN | ADI
The Analog Devices LTC4215IUFD-1 is a Hot Swap controller with I2C-compatible monitoring that allows a board to be safely inserted and removed from a live backplane. Housed in a 24-pin QFN (4x5 mm) exposed-pad package, the part drives an external N-channel MOSFET pass transistor and ramps supply voltage and inrush current at an adjustable rate while monitoring load conditions through an 8-bit ADC and the I2C/SMBus interface. A Hot Swap controller is a power-management integrated circuit that sits between a backplane supply rail and a removable plug-in card. Its role in the broader hierarchy is: Hot Swap controller -> power management IC -> semiconductor. By controlling inrush with dI/dt and electronic circuit-breaker action, it prevents connector arcing, MOSFET SOA stress, and downstream brown-out during hot-insertion events, which is critical in telecom shelves, server backplanes, and high-availability (A/B-redundant) systems. Key features include a wide operating voltage range of 2.9V to 15V, 8-bit ADC monitoring of current and voltage, adjustable current limit, electronic circuit breaker with 20 us (LTC4215 base) or 420 us (LTC4215-2) timeout, and an I2C/SMBus-compatible interface for telemetry. The exposed thermal pad (EP) on the 24-QFN package enables low thermal resistance for sustained fault-current operation. The architecture combines a precision current-sense amplifier, programmable inrush controller, and an integrated ADC with SMBus/I2C reporting registers. The LTC4215-1 variant adds additional fault-retry behavior versus the LTC4215 base part, and the -1 vs the base LTC4215 differs primarily in fault-latch / auto-retry policy - all three share the same 24-QFN footprint and I2C register map. Typical applications include telecom line cards, server blades with redundant -48V or 12V backplanes, RAID/HBA plug-in cards, and ATCA/uTCA AdvancedMC modules. Designers select the LTC4215 family when digital telemetry of board power is required alongside hot-swap protection. When designing with this part, choose the external N-channel MOSFET such that its SOA at the worst-case inrush and fault-current envelope stays inside the safe area; size the sense resistor against the current-limit threshold (10 mV to 100 mV typical). The exposed pad must be soldered to a copper pour of at least 1 sq inch to keep junction temperature within ratings. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical hot-swap design notes not found in the manufacturer datasheet alone.
LTC4257CS8#PBF - IEEE 802.3af PoE PD Interface Controller | ADI
The Analog Devices LTC4257CS8#PBF is an IEEE 802.3af Power over Ethernet (PoE) Powered Device (PD) interface controller with an onboard 100V, 400mA power MOSFET, packaged in an 8-pin SOIC (SO-8) and rated for commercial temperature operation from 0C to +70C. A PoE PD interface controller is the circuit block that lets a powered device, such as an IP phone or wireless access point, legally draw power from an Ethernet cable under IEEE 802.3af. It sits in the power-management IC hierarchy between the PoE PSE (power sourcing equipment) in the switch and the DC-DC converters that generate the device rails, providing detection, classification, and inrush control. Key features include the complete 25k ohm detection signature resistor, a programmable classification current source, input current limit with thermal foldback, undervoltage lockout, and power good (PGOOD) signaling - all integrated in a single 8-pin package. The integrated 100V, 400mA MOSFET eliminates a discrete pass device, and PBF suffix parts are lead-free. Technically, the LTC4257 manages the full PD handshake: it presents the signature resistance during PSE detection, sources the class-dependent current during classification, and then limits input current during power-up so inrush is controlled while the downstream converter starts. Thermal foldback reduces the current limit as junction temperature rises, protecting the internal MOSFET during sustained inrush or fault events. Typical applications include IP phones, network routers and switches, Power over LAN endpoints, security cameras, and wireless access points - anywhere a PD must extract up to the 802.3af class power (13 W maximum for Class 3) from the Ethernet pair. Design consideration: verify that the external classification resistor setting matches the power class your end equipment actually requires, since underspecifying prevents the PSE from allocating enough power and overclassing wastes budget on the switch. This page synthesizes distributor pricing, verified drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet, giving engineers a complete single-page reference for the LTC4257CS8#PBF.
LTC4353IMS#PBF - Dual Low Voltage Ideal Diode Controller | ADI
The Analog Devices LTC4353IMS#PBF is a dual low voltage ideal diode controller that drives two external N-channel MOSFETs in a 16-pin MSOP package, replacing two high-power Schottky diodes and their associated heat sinks while saving power and board area. An ideal diode controller is a power management IC that operates an external MOSFET as a near-lossless diode: the device senses the source-to-drain voltage and regulates the gate to keep the forward drop in the millivolt range. In the system hierarchy, it sits above discrete rectifiers and below full hot-swap and power ORing controllers, serving low-voltage DC rails that feed downstream DC-DC converters, voltage regulators, and point-of-load power management ICs. Key features include the dual 2:2 channel configuration in a single MSOP-16 package, which halves the controller count of discrete solutions. According to the Analog Devices LTC4353 datasheet (document 4353f), the part regulates the forward-voltage drop across each MOSFET to ensure smooth current transfer in diode-OR applications, permitting low-loss power supply ORing and supply holdup. A fast turn-on reduces load voltage droop during supply switchover, while a fast turn-off minimizes reverse-current transients if an input supply fails or is shorted. Technically, the LTC4353 implements a closed-loop forward-voltage regulation scheme around each N-channel MOSFET. Rather than simply amplifying the source-drain diode drop, it servos the gate so conduction transfers gradually between paralleled supplies, avoiding oscillation and current chopping. The low-voltage rating targets modern 3.3 V, 5 V, and intermediate bus rails where a Schottky diode drop of 0.4 V to 0.6 V would consume an unacceptable fraction of the margin. Because conduction loss scales with I-squared times RDS(on), a properly chosen MOSFET can cut ORing loss by a factor of five or more versus a Schottky at the same current, directly reducing heatsink size and thermal design effort. Typical applications include redundant supply ORing in low-voltage servers and networking blades, battery and adapter power-path selection in portable and industrial equipment, and supply holdup circuits bridging brief input interruptions. In each case the fast transient response keeps the load rail stable through the switchover event. When designing with this device, select MOSFETs for both low RDS(on) and adequate avalanche and body-diode robustness, since the controller must charge the gate quickly at turn-on; adequate ceramic decoupling at the input pins is also essential for clean switchover behavior. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-10-19.