1 Features

• 1A linear battery charger

– 3.0V to 18V input voltage operating range for

battery-to-battery charging, USB adapters, and

high impedance sources.

– Configurable battery regulation voltage with

0.5% accuracy from 3.5V to 4.65V in 10mV

steps

– Li-ion, Li-Poly, and LiFePO4 chemistry

compatible

– 5mA to 1A configurable fast charge current

– 115mΩ battery FET ON resistance

– 55mΩ battery FET ON resistance

– Up to 3A discharge current to support high

system loads

– Configurable NTC charging profile thresholds

including JEITA support

• Power path management for powering the system

and charging the battery

– Regulated system voltage (SYS) ranging from

4.4V to 5.5V addition to battery voltage

tracking.

– Battery Tracking input voltage dynamic power

management (VINDPM) for high impedance

input sources

• Ultra low quiescent current

– 15nA Shutdown mode

– 3.2μA Ship mode with button press wake

– 4μA in Battery Only mode

– 30μA Input adapter Iq in sleep mode

• One push-button wake-up and reset input

• Integrated fault protection

– Input overvoltage protection (VIN_OVP)

– 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

2 Applications

• TWS headset and charging case

• Smart glasses, AR and VR

• Smart watches and other wearable devices

• Retail automation and payment

• Building automation

3 Description

The BQ25186 is a linear battery charger IC focusing

on small solution size and low quiescent current for

extending battery life. The device is available in a

leadless, small package with a thermal pad giving

thermal performance. The device can support up to

1A charging and system loads of up to 3A.

The battery is charged using a standard Li-ion or

LiFePO4 charge profile with three phases: precharge,

constant current and constant voltage. Thermal

regulation provides the maximum charge current

while managing the device temperature. The charger

is also optimized for battery to battery charging

with 3V minimum input voltage operation and can

withstand 25V absolute maximum line transients. The

charger offers a wide operational VIN range for high

impedance sources such as solar cells and wireless

power. The device integrates a single push-button

input to reduce the total solution footprint.