BQ25872 Datasheet, PDF (1/68 Pages) Texas Instruments – Battery Switch Charger

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bq25872
SLUSCQ6 – OCTOBER 2016
bq25872 14-V, 7-A, Battery Switch Charger with Integrated 10-bit ADC
1 Features
•1 Adapter Input Voltage Range: 3 V to 14 V
– Allow up to 14-V Adaptor Voltage
• Highly Integrated 7-A Battery Switch
– Integrated MOSFETs and Current Sensing
– Low R_DS(on) (13-mΩ) MOSFETs for High
Current Operation
• Integrated High Accuracy ADC for System Monitor
– VBUS, VBAT, VOUT, VDROP Voltage
– Input and Battery Current
– Battery and VBUS Connector Temperature
• Linear Regulation (LDO) Mode Operation
– Four Linear Regulation Loops: IBUS, IBAT,
VBAT and VOUT
– Programmable Linear Regulation Thresholds
• Programmable Safety Protections
– VBUS, VOUT, and VBAT Over Voltage
Protections (OVP)
– IBUS and IBAT Over Current Protection (OCP)
– IBUS Reverse Current Protection (RCP)
– VDROP (VBUS-VOUT) OVP
– VBUS Connector and Battery Thermal
Protection
– Thermal Shutdown
• Integrated Input OVP FET Control with Fast OVP
Response (2 µs)
• Interrupt Status Output For Host Processor Alert
• Up To 1-MHz I²C Read and Write Speed
• Low Battery Leakage Current in Battery Only
Mode
• WCSP Package for Small Footprint
2 Applications
• Smart Phone
• Tablet PC
3 Description
The device is a 7-A battery switch charger with an
integrated 10-bit ADC. The high-current battery
switch charger is a 13-mΩ MOSFET with reverse
current blocking designed for high efficiency and
minimal voltage drop. The high-charge current
capability of the device makes it ideal for
smartphones, tablets, and other portable devices with
large battery capacity.
The integrated 10-bit ADC can measure input voltage
and current, battery voltage and current, as well as
battery temperature and input connector temperature.
This allows the user application to continuously
monitor the power input and battery charging
parameters to ensure the safety of the battery
charging. The flexible OVP and OCP thresholds for
VBUS, VOUT, and battery can be modified via I²C
registers as the battery goes through constant current
(CC) and constant voltage (CV) mode.
The I²C serial interface of the device can operate at
speeds up to 1 MHz and allows access to the ADC’s
measurements of the different charging parameters
and also allows for flexible software control of the
device. The INT pin provides instantaneous feedback
to the host in case of a fault condition. I²C status
registers allow the host to read the current status of
all faults and events.
The device comes in a DSBGA package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq25872
YFF (42)
2.5 mm x 3.1 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Power Supply
Host
Switch-Mode
Charger
VBUS SW
SDA/
SCL
SYS
BAT
bq25872
SDA/ ^VOUT
SCL
BATP
VBUS
OVP
GATE
BATN
VUSB SRP
System
Battery
Pack
SRN
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.