1 Features

• High integration buck-boost forward (sink) mode

charger for 1- to 7-cell Li-Ion batteries supporting

USB PD profile with integrated switching

MOSFETs and loop compensation

• Highly efficient

– Programmable switching frequency from

450kHz to 1.2MHz

– Bypass mode for >98.5% efficiency USB-PD

PPS direct battery charging at 20V, 3A

– Selectable PFM with out-of-audio (OOA)

operation for light load efficiency improvement

• Supports a wide range of input sources with

2.5V to 36V operating range and 45V absolute

maximum rating

– Support VIN down to 2.5V with VBAT > 3.2V

– USB-PD input

– Input voltage dynamic power management

(VINDPM) up to 36V to prevent input source

overload

– Optional input current dynamic power

management (IINDPM) up-to 3.3A for

maximum power limit

• Optional Narrow voltage DC (NVDC) power path

management

– System instant-on with depleted or no battery

– Battery supplements system when the adapter

is fully loaded

• I2C controlled for optimal system performance with

resistor-programmable option

– Hardware selectable default cell count, charge

voltage, input and charge current limits

– 3A charging current with 20mA resolution

• Reverse/OTG (source) mode powers input port

from battery

– 3.5V to 34V reverse output voltage with 20mV

resolution to support USB-PD PPS

– Up-to 3.3A reverse output current regulation

with 20mA resolution to support USB-PD PPS

• Low quiescent current

– TBD μA for battery only operation

– TBD μA for converter switching

• High accuracy

– TBD charge voltage regulation

– TBD input/output current regulation

• Safety

– Input and battery OVP

– Thermal regulation and thermal shutdown

– Converter MOSFETs OCP

– Charging safety timer

2 Applications

• Video doorbell, Smart home control

• Data concentrators, Wireless speaker, Appliances

• Smart trackers, Smart speaker

• Multiparameter patient monitor, Electrocardiogram

(ECG), Ultrasound smart probe

3 Description

The BQ25690 is a fully integrated switch-mode buckboost

charger for 1- to 7 cell Li-ion batteries, Lipolymer

batteries. Wide input voltage range from

2.5V to 36V supports applications powered from

battery, standard USB-PD adapters and high voltage

dedicated DC adapters. The device integrates 4

switching MOSFETs and all the converter loop

compensation for small solution size with simple

design. It uses NVDC power path management,

regulating the system slightly above the battery

voltage without dropping below a configurable

minimum system voltage. When system power

exceeds the input source rating, battery supplement

mode supports the system without overloading the

input source. The device also supports the full input

(sink) and output (reverse or source mode) voltage

ranges for USB Type-C and USB power delivery

(USB-PD) applications.