1.5A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC with 4.2 VBAT
The BQ24075TRGTR (from Texas Instruments) is a highly integrated single-cell Li-Ion / Li-Polymer linear battery charger IC with power-path management.
It is designed for portable and space-constrained applications, allowing a device to be powered from a USB port or AC adapter while simultaneously charging the battery. The device integrates charging control, power-path management, and safety features into a compact package.
A key feature is its Dynamic Power Path Management (DPPM), which ensures the system is powered even when the battery is low or absent, while intelligently managing charging current.
Key Features
Battery Charging
Supports single-cell Li-Ion / Li-Polymer batteries
Up to 1.5 A programmable charge current
Three-phase charging:
Pre-charge (conditioning)
Constant current
Constant voltage
Fixed 4.2 V charge voltage
Power Path Management
Dynamic Power Path Management (DPPM):
Powers system and charges battery simultaneously
Prioritizes system load over charging
Allows system operation even with:
Deeply discharged battery
No battery connected
Input & Power Features
Operates from:
USB input (100 mA / 500 mA selectable)
AC adapter
Programmable input current limit up to 1.5 A
Input voltage range: ~4.35 V to 6.4 V (28 V max rating)
Input dynamic power management (VIN-DPM) prevents source overload
Protection & Safety
Thermal regulation and shutdown
Over-voltage protection (OVP)
Short-circuit and reverse current protection
Battery temperature monitoring (NTC thermistor input)
Battery disconnect (SYSOFF) feature
Control & Status
Standalone operation (no MCU required, resistor-programmable)
Charge status outputs:
Charging
Charge complete
Power good
Physical Characteristics
Package: 16-pin VQFN (3 mm × 3 mm)
Operating temperature: –40°C to +85°C
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