LTC4061EDD#PBF - 840mA Standalone Linear Li-Ion Charger | ADI
N.º de pieza: LTC4061EDD#PBF ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.92 | $3,92 |
| 10 | $3.48 | $34,80 |
| 100 | $2.83 | $283,00 |
| 500 | $2.3 | $1.150,00 |
| 1.000 | $1.94 | $1.940,00 |
LTC4061EDD#PBF Descripción general
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.
Alternativas directas para LTC4061EDD#PBF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC4061EDD-4.4#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4061EDD#TRPBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4061EDD-4.2#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LTC4061EDD#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.94 / unidad
Ver hoja de datos →LTC4054ES5-4.2#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4075EDD#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4061EDD#PBF Especificaciones
| Battery Chemistry | Lithium-Ion (single cell) |
| Number of Cells | 1 |
| Charge Topology | Linear (CC/CV) |
| Input Voltage (max) | 8 V |
| Final Float Voltage | 4.2 V |
| Programmable Charge Current (max) | 840 mA |
| Charge Termination | Programmable time and programmable current |
| Status Output | Open-drain CHRG |
| NTC Thermistor Input | Yes |
| Battery Drain (input removed) | 3 uA |
| USB-Compatible | Yes |
| Temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 10-pin DFN (3x3 mm) with exposed pad |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 |
| Lead-Free / RoHS | Yes (Pb-free #PBF suffix) |
Configuración de pines de LTC4061EDD#PBF
| Pin 1 | VCC — Input supply voltage (up to 8V) |
| Pin 2 | CHRG — Open-drain charge status output |
| Pin 3 | NTC — NTC thermistor input for qualified-temperature charging |
| Pin 4 | PROGENT — Charge current programming resistor to GND |
| Pin 5 | GND — Ground |
| Pin 6 | BAT — Battery connection (charge output / sense input) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
Aplicaciones típicas
LTC4061EDD#PBF es adecuado para 6 aplicacións: USB Single-Cell Li-Ion Charger, Portable Medical & Wearable Devices, Bluetooth / Wireless Headphone Charging Cradle, Handheld Test Instruments & Data Loggers, IoT Sensor Node Battery Backup, Industrial Handheld Scanners / POS Terminals.
USB Single-Cell Li-Ion Charger
The LTC4061 is purpose-built for USB-powered single-cell Li-Ion charging in portable electronics. Its 8V tolerance on VCC lets it sit directly on a 5V USB rail without upstream protection, while the 840 mA programmable charge current covers both USB 500 mA and dedicated 1A wall-adapter use cases. The internal 3 uA quiescent drain from BAT when VCC is removed prevents the charger itself from discharging a connected battery during storage. The NTC input qualifies charging only when the cell temperature is inside the safe window, which is required for UL/IEC 60950-1 USB charging compliance. Place a 4.7 uF ceramic on VCC, a 4.7 uF ceramic on BAT, and a 1.5 kOhm PROGENT resistor to GND for the full 840 mA charge current — see datasheet typical application circuit.
Recomendado
Portable Medical & Wearable Devices
The LTC4061's small 3x3 mm DFN-10 footprint and low 3 uA battery leakage make it a strong fit for wearable and portable medical devices where PCB area and standby drain are tightly constrained. The integrated CHRG open-drain status output drives an LED or host GPIO without additional glue logic, simplifying the BOM. The NTC thermistor input satisfies medical battery-pack guidelines by gating charge outside the qualified temperature window. The 4.2V ±1% accuracy float voltage protects sensitive Li-Ion cells against overcharge that could otherwise degrade cycle life. Combined with a downstream LDO such as the ADP3330, the LTC4061 delivers a clean, isolated power path for continuous-wear wearables.
Recomendado
Bluetooth / Wireless Headphone Charging Cradle
Charging cradles for Bluetooth headphones and earbuds use single-cell Li-Ion batteries and benefit from the LTC4061's USB-friendly input range. The 840 mA programmable charge current means a 100 mAh earbud cell can be fully recharged in under 30 minutes when paired with a higher-current PROGENT setting. The exposed-pad DFN-10 package keeps the charger footprint under 9 mm², leaving room for the USB-C receptacle and indicator LED. The CHRG pin drives a status LED directly, giving users instant feedback. Internal thermal regulation automatically folds back charge current at elevated die temperatures, which is critical in enclosed cradle housings without heatsink area.
Recomendado
Handheld Test Instruments & Data Loggers
Handheld instruments and data loggers often charge a single 18650 or pouch Li-Ion cell from a 5V USB rail and demand low standby drain between uses. The LTC4061's 3 uA battery drain when input is removed is critical for monthly-storage products where parasitic draw would otherwise flatten the cell. The 8V VCC tolerance gives designers margin against non-USB 6V adapters or faulted supplies. The exposed-pad DFN-10 keeps the charger footprint compact while delivering up to 840 mA — sufficient for 1 C-rate on a 700-800 mAh cell. The programmable termination by both current and time gives engineers flexibility to optimize charge duration against cell wear.
Recomendado
IoT Sensor Node Battery Backup
For IoT sensor nodes that occasionally lose primary power and must run from a backup Li-Ion or Li-Po cell, the LTC4061 provides a USB-friendly charging front-end with automatic recharge behavior. Its open-drain CHRG pin can wake a host microcontroller only when input is present and charging, minimizing interrupt load. The NTC input allows safe charging of Li-Po cells used in outdoor sensor pods that experience wide temperature swings. With programmable current down to a few milliamps via a high-impedance PROGENT resistor, the part supports small coin-cell-friendly cells as well as larger 18650 cells, all without changing the PCB.
Recomendado
Industrial Handheld Scanners / POS Terminals
Industrial handheld scanners and mobile POS terminals often rely on a single-cell Li-Ion battery that is charged through a 5V USB-C or barrel-jack input. The LTC4061's 8V input tolerance, programmable 840 mA charge current, and integrated NTC thermistor input deliver a robust charging front-end that meets industrial environmental and safety requirements. The exposed pad of the DFN-10 package spreads heat into the PCB copper pour, eliminating the need for a heatsink even at full 840 mA in a 25°C ambient. The CHRG open-drain status output interfaces directly with the scanner's host MCU, enabling on-screen battery-state UI without extra circuitry.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC4061EDD#PBF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC4061EDD-4.4#PBF | LTC4061EDD#TRPBF | LTC4054ES5-4.2#PBF | LTC4075EDD#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-DFN (3x3 mm) | 10-DFN (3x3 mm) - same | 10-DFN (3x3 mm) - same | 10-DFN (3x3 mm) - same | 10-DFN (3x3 mm) - same |
| Float Voltage | 4.2 V | 4.4 V (+5%) | 4.2 V (same) | 4.2 V (same) | 4.2 V (same) |
| Max Charge Current | 840 mA | 840 mA | 840 mA | 500 mA (-40%) | 800 mA (-5%) |
| Input Voltage (max) | 8 V | 8 V | 8 V | 8 V | 8 V |
| NTC Thermistor Input | Yes | Yes | Yes | Yes | No (parallel/backup topology) |
| CHRG Status Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- Higher charge current than LTC4054 family (frente a LTC4054ES5-4.2#PBF)
- Pin-compatible with -4.4 variant for newer chemistries (frente a LTC4061EDD-4.4#PBF)
- Integrated NTC input reduces BOM vs LTC4075 (frente a LTC4075EDD#PBF)
Notas de diseño
Estimated: at VIN=5V, VBAT=3.7V and 840 mA charge current, the linear charger dissipates about (5 - 3.7) * 0.84 = 1.09 W in the pass transistor. The DFN-10 exposed pad typically shows ~40 C/W theta_JA on a 1 sq inch 2-oz copper pour, yielding ~44°C junction rise — well within the 125°C thermal shutdown limit. For continuous 840 mA charging at elevated ambient, add copper area under the exposed pad or reduce PROGENT current.
Place a 4.7 uF X5R ceramic bypass capacitor on VCC and a 4.7 uF X5R ceramic on BAT, both within 2 mm of their respective pins. Per the LTC4061 datasheet, insufficient BAT capacitance can cause the charger to oscillate or to misread the BAT pin during CV mode. A 0.1 uF ceramic in parallel with the BAT bulk cap reduces high-frequency impedance.
If the NTC thermistor input is not used, the pin MUST be tied to a valid bias (e.g., a resistor to VCC) to enable charging — leaving it floating disables charge. Do not exceed 8V on VCC; even brief transients above the abs-max rating will damage the IC. Ensure the PROGENT resistor is 1% or better for charge-current accuracy, and place it close to the PROGENT pin to minimize leakage.
Solder the exposed thermal pad to a copper pour on the top layer connected to GND with multiple thermal vias to inner planes. This both improves heat spreading and provides the ground reference the charger requires. Route BAT traces away from switching nodes if a downstream switching regulator shares the board, to avoid false CHRG pin state changes from coupled noise.
Información de cumplimiento
#PBF suffix denotes Pb-free and RoHS-compliant per Analog Devices ordering information. Halogen-free status not explicitly stated in verified web data.
