1 Features

• High-efficiency, 1.5-MHz, synchronous switching

mode buck charger for single cell battery

– >90 efficiency down to 25-mA charge current

from 5-V input

– Charge termination from 10 mA to 620 mA, 10-

mA steps

– Flexible JEITA profile for safe charging over

temperature

• BATFET control to support shutdown, ship mode

and full system reset

– 1.5-μA quiescent current in battery only mode

– 0.15-μA battery leakage current in ship mode

– 0.1-μA battery leakage current in shutdown

• Supports USB On-The-Go (OTG)

– Boost mode operation supporting 3.84-V to 9.6-

V output

– >90 boost efficiency down to 100-mA OTG

current for 5-V VBUS

• Supports a wide range of input sources

– 3.9-V to 18-V wide input operating voltage

range with 26-V absolute maximum input

voltage

– Maximizes source power with input voltage

regulation (VINDPM) and input current

regulation (IINDPM)

– VINDPM threshold automatically tracks battery

voltage

• Efficient battery operation with 15-mΩ BATFET

• Narrow VDC (NVDC) power path management

– System instant-on with depleted or no battery

– Battery supplement when adapter is fully

loaded

• Flexible autonomous or I2C-controlled modes

• Integrated 12-Bit ADC for voltage, current,

temperature monitoring

• High accuracy

– ±0.5 charge voltage regulation

– ±5 charge current regulation

– ±5 input current regulation

• Safety

– Thermal regulation and thermal shutdown

– Input, system, battery overvoltage protection

– Battery, converter overcurrent protection

– Charging safety timer

2 Applications

• Tablet

• Gaming and Computer Accessories

• IP Camera, EPOS

• Portable Medical Equipment

3 Description

BQ25620 and BQ25622 are a highly-integrated 3.5-

A switch-mode battery charge management and

system power path management device for single

cell Li-Ion and Li-polymer batteries. The solution is

highly integrated with built-in current sensing, loop

compensation, input reverse-blocking FET (RBFET,

Q1), high-side switching FET (HSFET, Q2), lowside

switching FET (LSFET, Q3), and battery FET

(BATFET, Q4) between system and battery. It uses

narrow VDC power path management, regulating the

system slightly above the battery voltage without

dropping below a configurable minimum system

voltage. The low impedance power path optimizes

switch-mode operation efficiency, reduces battery

charging time, extends battery life during discharging

phase, and the ultra-low 0.15-μA ship mode current

extends battery shelf life. The I2C serial interface with

charging and system settings makes BQ25620 and

BQ25622 truly flexible solutions.