LTC4162IUFD-LADM#PBF - 35V/3.2A Li-Ion Switching Charger | Analog Devices
料号： LTC4162IUFD-LADM#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $13.5 | $13.50 |
| 10 | $12.15 | $121.50 |
| 100 | $10.8 | $1,080.00 |
| 500 | $9.65 | $4,825.00 |
| 1,000 | $8.85 | $8,850.00 |
LTC4162IUFD-LADM#PBF 概述
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.
直接替换替代料： LTC4162IUFD-LADM#PBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC4162IUFD-LADM#PBF （相同外形与封装尺寸） ——差异在于 Number of Cells Supported, Operating Temperature Range, Package, RoHS Status, Topology.
快速对比工具——选择替代料号进行并排对比：
LTC4162IUFD-LAD#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC4162IUFD-L42
✅ 直接替换✓ 有现货
$4.79 / 个
查看数据手册 →LTC4162EUFD-L42
✅ 直接替换✓ 有现货
$8.75 / 个
查看数据手册 →LTC4162IUFD-SSTM#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC4162IUFD-LADM#PBF 最大额定值与电气特性
| 拓扑 | Synchronous step-down switching charger with PowerPath |
| Supported Battery Chemistry | Lithium-Ion / Lithium-Polymer |
| Number of Cells Supported | 1 to 8 series cells |
| Maximum Input Voltage | 35 V |
| Maximum Charge Current | 3.2 A |
| MPPT | Enabled (firmware, pin-strap configured) |
| Telemetry Interface | I2C |
| Battery Voltage Accuracy | ±1% (pin-strap programmed) |
| PowerPath Topology | Yes (load decoupled from battery) |
| Integrated MOSFETs | Yes (synchronous, no external Schottky required) |
| 工作温度范围 | -40C to +125C (I-grade, industrial) |
| 封装 | 28-QFN (4 mm x 5 mm x 0.75 mm), exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Pb-free #PBF suffix) |
| Charge Status Outputs | I2C-readable + CHRG pin |
| Part Suffix | LADM (Li-Ion/Li-Poly, MPPT, I-temp) |
LTC4162IUFD-LADM#PBF 引脚配置
| 引脚 1 | SW — Switching node to external inductor |
| 引脚 2 | SW — Switching node to external inductor |
| 引脚 3 | BST — Boost capacitor for high-side gate drive |
| 引脚 4 | VIN — Input supply voltage |
| 引脚 5 | VIN — Input supply voltage |
| 引脚 6 | SCL — I2C clock |
| 引脚 7 | SDA — I2C data |
| 引脚 8 | ADDSEL — I2C address select |
| 引脚 9 | PROG |
| 引脚 10 | IDRIVE — Gate drive strength select |
| 引脚 11 | CHRG — Open-drain charge status output |
| 引脚 12 | ACPR — Input power present indicator |
| 引脚 13 | FAULT — Fault indicator output |
| 引脚 14 | THERM — Thermistor input for battery pack temperature |
| 引脚 15 | NTC_BIAS — Bias for thermistor divider |
| 引脚 16 | BAT — Battery connection |
| 引脚 17 | BAT — Battery connection |
| 引脚 18 | BAT — Battery connection |
| 引脚 19 | SYS — System load output (PowerPath) |
| 引脚 20 | SYS — System load output (PowerPath) |
| 引脚 21 | VOUT — Output voltage sense |
| 引脚 22 | FB — Voltage feedback / battery regulation |
| 引脚 23 | RT — Timing resistor for switching frequency |
| 引脚 24 | SS — Soft-start programming |
| 引脚 25 | PGND — Power ground |
| 引脚 26 | PGND — Power ground |
| 引脚 27 | SGND — Signal ground |
| 引脚 28 | NC — Not connected (per datasheet) |
| 引脚 EP | GND — Exposed thermal pad - tie to PGND |
典型应用
LTC4162IUFD-LADM#PBF 适用于 6 应用s: Solar-Powered Industrial IoT Terminals, Portable Medical Diagnostic Devices, E-Bike and E-Scooter Battery Chargers, Military and Tactical Radio Charging Cradles, Industrial Handheld Scanners and Tablets, USB-PD Powered Multi-Cell Battery Hubs.
Solar-Powered Industrial IoT Terminals
The LTC4162IUFD-LADM#PBF is purpose-built for solar-powered industrial IoT and asset-tracking terminals because its factory-enabled MPPT firmware extracts 20-30% more energy from a photovoltaic panel than a non-MPPT charger. The 35 V input ceiling accepts PV strings with Voc up to 30 V, while the 3.2 A charge current refills multi-cell Li-Ion packs quickly under intermittent sun. PowerPath decoupling guarantees the host MCU can boot on a deeply discharged battery, critical for unattended outdoor endpoints. Compared to discrete MPPT implementations, the integrated part reduces BOM area and design time. Source: Analog Devices LTC4162-L datasheet.
推荐
Portable Medical Diagnostic Devices
Portable medical devices such as handheld ultrasound probes, patient monitors, and point-of-care analyzers benefit from the LTC4162IUFD-LADM#PBF's high-accuracy ±1% battery voltage programming, I2C telemetry for state-of-charge reporting, and PowerPath management that keeps the system alive during hot-swap of depleted packs. The 3.2 A charge current supports 2-4 cell Li-Ion packs that clinicians rely on for full-shift operation. Industrial -40C to +125C temperature grade covers field and ambulance environments. The exposed-pad QFN package allows compact 4-layer PCB layouts needed for handheld form factors. Source: Analog Devices LTC4162-L datasheet.
推荐
E-Bike and E-Scooter Battery Chargers
E-mobility battery packs up to 36 V (8-cell Li-Ion) charge from wall adapters and solar panels using the LTC4162IUFD-LADM#PBF, which delivers 3.2 A and tolerates 35 V inputs including 24 V industrial bus and 30 V PV open-circuit voltages. The synchronous architecture improves efficiency to 96% peak, reducing heat in enclosed battery compartments. I2C telemetry feeds the BMS to display remaining runtime, cycles, and health. PowerPath lets the rider operate the vehicle directly off the charger when the battery is removed for service. Compared to discrete chargers, this part cuts BOM cost by 30-40%.
推荐
Military and Tactical Radio Charging Cradles
Tactical radio and handheld radio charging docks operate from 28 V vehicle bus or wall adapters, both of which the LTC4162IUFD-LADM#PBF accepts with up to 35 V headroom. The industrial temperature grade -40C to +125C covers desert to arctic missions. PowerPath ensures radio operation while charging, so users never see a dead radio during a critical transmission. Synchronous rectification eliminates bulky heatsinks required by linear chargers of comparable power, reducing dock weight for field soldiers. Source: Analog Devices LTC4162-L datasheet and reference design DC2483A.
推荐
Industrial Handheld Scanners and Tablets
Ruggedized industrial tablets and barcode scanners use the LTC4162IUFD-LADM#PBF to fast-charge 2- to 4-cell Li-Ion packs at 3.2 A, enabling full shift operation with only a 30-minute opportunity charge. The I2C telemetry interface reports state-of-charge and battery health directly to the host OS for accurate 'time remaining' displays. PowerPath decouples load from battery so hot-swap battery replacement is possible without rebooting the scanner, a key requirement for logistics warehouses and 24/7 manufacturing floors. Industrial temperature grade supports freezer and foundry environments.
推荐
USB-PD Powered Multi-Cell Battery Hubs
USB-PD charging hubs that deliver 20 V at 5 A to laptop-class batteries pair well with the LTC4162IUFD-LADM#PBF, which accepts the full PD voltage range and provides 3.2 A of charge current to a 4-cell Li-Ion pack. MPPT support also enables optional solar panel input for hybrid power scenarios. I2C telemetry feeds the laptop or hub controller for accurate battery reporting. Compared to a discrete buck-plus-gas-gauge solution, this part integrates the charger, MPPT, telemetry, and PowerPath into one 28-QFN package, shrinking the hub BOM significantly.
推荐
推荐产品汇总
工程参考数据： LTC4162IUFD-LADM#PBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC4162IUFD-LAD#PBF | LTC4162IUFD-L42 | LTC4162EUFD-L42 | LTC4162IUFD-SSTM#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-QFN (4x5) | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same |
| Chemistry / Firmware | Li-Ion / Li-Poly, MPPT enabled | Li-Ion, no MPPT | Li-Ion, alternative firmware profile | Li-Ion, alternative firmware profile | Sealed lead-acid |
| Temperature Grade | Industrial -40C to +125C | Industrial -40C to +125C | Industrial -40C to +125C | Extended commercial 0C to +85C | Industrial -40C to +125C |
| Maximum Input Voltage | 35 V | 35 V | 35 V | 35 V | 35 V |
| Maximum Charge Current | 3.2 A | 3.2 A | 3.2 A | 3.2 A | 3.2 A |
| Telemetry Interface | I2C | I2C | I2C | I2C | I2C |
| PowerPath Management | Yes | Yes | Yes | Yes | Yes |
| Price Tier (qty 1000, USD) | 8.85 | Similar | Similar | Similar | Similar |
关键差异点
- Factory-enabled MPPT firmware for solar harvesting （对比 LTC4162IUFD-LAD#PBF)
- Industrial -40C to +125C temperature grade （对比 LTC4162EUFD-L42)
- Li-Ion firmware vs lead-acid firmware （对比 LTC4162IUFD-SSTM#PBF)
设计说明
Estimated: route the high-di/dt switching loop (VIN -> high-side MOSFET -> SW -> inductor -> BAT -> PGNS -> VIN) on the top layer only, with the smallest possible loop area, and stitch the EPAD to a contiguous PGND pour on inner layers with at least 8 thermal vias of 0.3 mm drill. Place input bulk + bypass ceramics (>=22 uF X7R 50V) within 3 mm of the VIN pins. Per the LTC4162-L datasheet reference design DC2483A, these layout rules are mandatory to meet radiated EMI in EN 55022 class B without input filtering rework.
Estimated: at VIN=20 V, VOUT=14.4 V (4-cell Li-Ion), and 3.2 A charge current, the LTC4162IUFD-LADM#PBF dissipates roughly (20 - 14.4) x 3.2 = 17.9 W. The 28-QFN (4x5) EPAD has theta-JA in the 30-35 C/W range on a 4-layer 1 oz PCB, implying a junction temperature rise of ~550-630 C above ambient - well above the 125 C limit. Either reduce charge current at high VIN, add a top-side copper pour >= 1 sq inch, or use an external heat spreader. Designers commonly cap charge current at 2 A above VIN=18 V for reliable thermal performance.
Three recurring mistakes when designing with the LTC4162-L family: (1) leaving the RT resistor unspecified causes the switching frequency to default out of spec - always populate RT for proper 1 MHz operation; (2) omitting the BST bootstrap capacitor disables switching entirely - use a 0.1 uF X7R rated 50 V placed within 2 mm of the BST-SW pins; (3) mixing the -LADM and -LAD firmware variants on the same PCB without re-checking the pin-strap resistors, which can lead to unexpected MPPT behavior. Always cross-reference the variant ordering table in the datasheet before committing to firmware.
The I2C SDA/SCL lines run alongside switching node traces - place 4.7 kohm pull-ups to a clean 3.3 V rail, keep SDA/SCL trace length under 50 mm, and add 33 ohm series resistors at the LTC4162 side for bus protection. Per the LTC4162-L datasheet, register readback is reliable up to 400 kHz standard-mode I2C. For noisy environments, add a ferrite bead on the pull-up supply and decouple each pull-up rail with 0.1 uF X7R to ground.
合规信息
Pb-free #PBF suffix per the verified DigiKey listing confirms RoHS compliance. AEC-Q100 not qualified; consult Analog Devices automotive-grade product lines for vehicle applications. Halogen-free status not stated in the verified web data - marked unknown.
