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LTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC 4.2V 500mA (10-Pack)
LTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC 4.2V 500mA (10-Pack)
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LTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC - 4.2V / 500mA (10-Pack)
The LTC4054 (also LTC4054ES5-4.2) is a standalone linear charger IC for single-cell 3.7V Li-ion and LiPo batteries in a compact SOT-23-5 surface-mount package. With programmable charge current up to 800mA, built-in thermal regulation, and a charge status output, it is the simplest way to add USB or wall adapter Li-ion charging to any portable device design.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | LTC4054 / LTC4054ES5-4.2 |
| Package | SOT-23-5 (SMD) |
| Battery Chemistry | Single-cell Li-ion / LiPo (3.7V nominal) |
| Float Voltage | 4.2V (fixed, +/-1%) |
| Max Charge Current | 800mA (set by RPROG resistor) |
| Input Voltage Range | 4.25V - 6.5V (USB 5V compatible) |
| Charge Termination | C/10 current cutoff (automatic) |
| Thermal Regulation | Yes - reduces current to limit junction temp to 115C |
| CHRG Status Pin | Open-drain (LOW = charging, Hi-Z = complete/standby) |
| Quiescent Current | 85uA (charging) / 2uA (standby) |
| Quantity | 10 pieces |
Charge Current Setting
| RPROG (kohm) | Charge Current |
|---|---|
| 10k | ~100mA |
| 4k | ~250mA |
| 2k | ~500mA |
| 1.2k | ~800mA |
Why Choose LTC4054?
- USB 5V Compatible - Direct connection to USB VBUS (4.25V-6.5V input range)
- Thermal Regulation - Automatically reduces charge current to prevent overheating; no heatsink needed
- Programmable Current - Single resistor sets charge current from 100mA to 800mA
- Automatic Termination - Stops charging at C/10 current; no external timer needed
- SOT-23-5 Package - Minimal PCB footprint for space-constrained wearable and IoT designs
Typical Applications
- USB-powered Li-ion/LiPo battery charger for IoT devices
- Wearable device battery charging circuit
- Portable sensor node battery management
- Arduino/ESP32 project Li-ion charging module
- Power bank charging IC
- Single-cell LiPo charger for RC models and drones
Minimal Application Circuit
VCC to USB 5V. BAT to Li-ion battery positive. GND to battery negative. RPROG resistor (2k ohm for 500mA) from PROG pin to GND. CHRG pin to LED via 10k ohm pull-up to VCC for charge status indicator. No other components required.
FAQ
Q: Can LTC4054 charge a 2-cell (7.4V) Li-ion pack? No - LTC4054 is designed for single-cell (4.2V) only. For multi-cell packs, use LTC4002, BQ24195, or dedicated multi-cell charger ICs.
Q: Is LTC4054 the same as TP4054? Yes - TP4054 is a Chinese-manufactured equivalent with identical pinout and specifications. Both are drop-in replacements for each other.
Package Contents
- 10x LTC4054 SOT-23-5 Li-Ion Battery Charger IC
- ★Product Description
- ★About us
- ★Custom cable
LTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC - 4.2V / 500mA (10-Pack)
The LTC4054 (also LTC4054ES5-4.2) is a standalone linear charger IC for single-cell 3.7V Li-ion and LiPo batteries in a compact SOT-23-5 surface-mount package. With programmable charge current up to 800mA, built-in thermal regulation, and a charge status output, it is the simplest way to add USB or wall adapter Li-ion charging to any portable device design.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | LTC4054 / LTC4054ES5-4.2 |
| Package | SOT-23-5 (SMD) |
| Battery Chemistry | Single-cell Li-ion / LiPo (3.7V nominal) |
| Float Voltage | 4.2V (fixed, +/-1%) |
| Max Charge Current | 800mA (set by RPROG resistor) |
| Input Voltage Range | 4.25V - 6.5V (USB 5V compatible) |
| Charge Termination | C/10 current cutoff (automatic) |
| Thermal Regulation | Yes - reduces current to limit junction temp to 115C |
| CHRG Status Pin | Open-drain (LOW = charging, Hi-Z = complete/standby) |
| Quiescent Current | 85uA (charging) / 2uA (standby) |
| Quantity | 10 pieces |
Charge Current Setting
| RPROG (kohm) | Charge Current |
|---|---|
| 10k | ~100mA |
| 4k | ~250mA |
| 2k | ~500mA |
| 1.2k | ~800mA |
Why Choose LTC4054?
- USB 5V Compatible - Direct connection to USB VBUS (4.25V-6.5V input range)
- Thermal Regulation - Automatically reduces charge current to prevent overheating; no heatsink needed
- Programmable Current - Single resistor sets charge current from 100mA to 800mA
- Automatic Termination - Stops charging at C/10 current; no external timer needed
- SOT-23-5 Package - Minimal PCB footprint for space-constrained wearable and IoT designs
Typical Applications
- USB-powered Li-ion/LiPo battery charger for IoT devices
- Wearable device battery charging circuit
- Portable sensor node battery management
- Arduino/ESP32 project Li-ion charging module
- Power bank charging IC
- Single-cell LiPo charger for RC models and drones
Minimal Application Circuit
VCC to USB 5V. BAT to Li-ion battery positive. GND to battery negative. RPROG resistor (2k ohm for 500mA) from PROG pin to GND. CHRG pin to LED via 10k ohm pull-up to VCC for charge status indicator. No other components required.
FAQ
Q: Can LTC4054 charge a 2-cell (7.4V) Li-ion pack? No - LTC4054 is designed for single-cell (4.2V) only. For multi-cell packs, use LTC4002, BQ24195, or dedicated multi-cell charger ICs.
Q: Is LTC4054 the same as TP4054? Yes - TP4054 is a Chinese-manufactured equivalent with identical pinout and specifications. Both are drop-in replacements for each other.
Package Contents
- 10x LTC4054 SOT-23-5 Li-Ion Battery Charger IC
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