1 Features

• 1-A linear battery charger

– 3.0V to 18V input voltage operating range

optimized for battery-to-battery charging and

USB adapters

– 25V tolerant input voltage

– Configurable battery regulation voltage with

0.5 accuracy from 3.6V to 4.65V in 10mV

steps

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

support

– 5mA to 1A configurable fast charge current

– 115mΩ battery FET ON resistance

– Up to 3.125A discharge current to support high

system loads

– Configurable termination current down to

0.5mA

– Configurable NTC charging profile thresholds

including JEITA support

– Power cycle and advanced reset mechanism

• Power path management for powering the system

and charging the battery

– Regulated system voltage (SYS) ranging from

4.4V to 4.9V in addition to battery voltage

tracking and input pass-though options

– Configurable input current limit

– USB Suspend mode supported

– Battery Tracking input voltage dynamic power

management (VINDPM) for high impedance

input sources

– Dynamic power path management optimizes

charging from weak adapters

• 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 undervoltage protection (BUVLO)

– 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 3.125A.