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.