1 Features

• 800-mA Power path linear battery charger

– 3.0-V to 5.9-V input voltage operating range

optimized for battery to battery charging and

USB adapter

– 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 800-mA configurable fast charge

current

– 55-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

– Selectable adapter or battery power for system

– Dynamic power path management optimizes

charging from weak adapters

• Ultra low quiescent current modes

– 30-nA Shutdown mode

– 3.2-μA Ship mode with button press wake

– 4 μA in Battery Only mode

– 45-μA 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 (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 headset and charging case

• Smart glasses, AR and VR

• Smart watches and other wearable devices

• Retail automation and payment

• Building automation

3 Description

The BQ21080 is a linear battery charger IC focusing

on small solution size and low quiescent current for

extending battery life. The device is available in an

8-ball chipscale package which does not need HDI

PCB process for fabrication thereby reducing the PCB

cost. The device can support up to 800-mA charging

and system loads of up to 2.5 A.