1 Features
• 1-A Power path linear battery charger
– 3.0-V to 5.9-V input voltage operating range
– 25-V tolerant input voltage
– Configurable battery regulation voltage with
0.5% accuracy from 3.6 V to 4.65 V in 10-mV
steps
– 5-mA to 1-A configurable fast charge current
– 110-mΩ battery FET ON resistance
– Up to 2.5-A discharge current to support high
system loads
– Configurable termination current down to 0.5
mA
– Configurable NTC charging profile thresholds
including JEITA support
– Power cycle and advanced reset mechanisms
to recover system
• Power path management for powering the system
and charging the battery
– Regulated system voltage (SYS) ranging from
4.4 V to 4.9 V in addition to battery voltage
tracking and input pass-though options
– Configurable input current limit from 50mA to
1100mA
– Selectable adapter or battery power for system
– I2C allow host to disconnect the battery or
adapter from system as needed
– Dynamic power path management optimizes
charging from weak adapters
• Ultra low quiescent current modes
– 15-nA Shutdown mode
– 3.2-μA Ship mode with button press wake
– 4 μA in Battery only mode
– 40-μA input adapter Iq in Sleep mode
• Dedicated VIN Power Good (/PG_GPO) and
Charge Enable (/CE) pins
• One push-button wake-up and reset input
• Integrated fault protection
– Input overvoltage protection (VIN_OVP)
– Battery undervoltage protection (VBUVLO)
– Battery short protection (BATSC)
– Battery overcurrent protection (BATOCP)
– Input current limit protection (ILIM)
– Thermal regulation (TREG) and thermal
shutdown (TSHUT)
– Battery thermal fault protection (TS)
– Watchdog and safety timer fault
– System short protection
– System overvoltage protection
2 Applications
• TWS charging case
• Medical
• Gaming accesories
• Bulding automation
• IoT devices
• Asset tracking
• Retail automation and payment
3 Description
The BQ25181 is a linear battery charger IC focusing
on small solution size and low quiescent current
for maximum battery life while providing the best
thermal performance through a QFN package with
a thermal pad. The PowerPath function enables
continous power to the regulated system voltage
(SYS) while charging the battery and providing
accurate termination. The device can support up to
1-A charging and system loads of up to 2.5 A.
The BQ25181 is I2C compatible and is highly
configurable providing flexibility and charging control
for various applications. The BQ25181 is available in
a small 10-pin DLH package.