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
• 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
• 4.1-V / 4.2-V / 4.35-V / 4.4-V 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 current setting pin ICHG is
open or short
– JEITA 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 BQ25303J is a highly-integrated standalone
switch-mode battery charger for 1-cell Li-ion and Lipolymer
batteries. The BQ25303J 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 BQ25303J is
available in a 3x3 WQFN package for easy 2-layer
layout and space limited applications.