1 Features

• Standalone charger and easy to configure

• High-efficiency, 1.2-MHz, synchronous switchmode

buck charger

– 92.5% charge efficiency at 2A from 5-V input

for 1-cell battery

– 91.8% charge efficiency at 2A from 9-V input

for 1-cell battery

– 95% charge efficiency at 2A from 12-V input for

2-cell battery

• Single input to support USB input and high voltage

adaptors

– Support 4.1-V - 17-V input voltage range with

28-V absolute maximum input voltage rating

– Input Voltage Dynamic Power Management

(VINDPM) tracking battery voltage

• High integration

– Integrated reverse blocking and synchronous

switching MOSFET

– Internal input and charge current sense

– Internal loop compensation

– Integrated bootstrap diode

• 3.4-V to 9.0-V programmable charge voltage

• 3.0-A maximum fast charge current

• 200-nA low battery leakage current at 4.5-V VBAT

• 4.25-μA VBUS supply current in IC disable mode

• Charge current thermal regulation at 120°C

• Precharge current: 10% of fast charge current

• Termination current: 10% of fast charge current

• Charge accuracy

– ±0.5% charge voltage regulation

– ±10% charge current regulation

• Safety

– Thermal regulation and thermal shutdown

– Input Under-Voltage Lockout (UVLO) and Over-

Voltage Protection (OVP)

– Battery overcharge protection

– Safety timer for precharge and fast charge

– Charge disabled if battery feedback pin FB is

open or short

– Cold/hot battery temperature protection

– Fault report on STAT pin

• Available in WQFN 3x3-16 package

2 Applications

• Wireless speaker

• Gaming

• Cradle charger

• Medical

3 Description

The BQ25306 is a highly-integrated standalone

switch-mode battery charger for 1-cell and 2-cell Liion,

Li-polymer, and LiFePO4 batteries. The BQ25306

supports 4.1-V to 17-V input voltage and 3-A fast

charge current.The integrated current sensing

topology of the device enables high charge efficiency

and low BOM cost. The best-in-class 200-nA low

quiescent current of the device conserves battery

energy and maximizes the shelf time for portable

devices. The BQ25306 is available in a 3x3 WQFN

package for easy 2-layer layout and space limited

applications.