Texas Instruments BQ25120A Manual

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BQ25121A Low I
1 Features
• Increases System Operation Time Between
Charges
– Configurable 300-mA Buck Regulator
(2.5-V Default)
– 700 nA (typical) Iq with Buck Converter
Enabled (No Load)
– Configurable Load Switch or 100mA LDO
Output (Load Switch by Default)
– Up to 300-mA Charge Current for Fast
Charging
– 0.5% Accurate Battery Voltage Regulation
(Configurable from 3.6 V to 4.65 V in 10-mV
Steps)
– Configurable Termination Current Down to
500 µA
– Simple Voltage Based Battery Monitor
– Watchdog Timer Disabled
• Highly Integrated Solution with Small Footprint
– 2.5 mm x 2.5 mm WCSP Package and 6
External Components for Minimal Solution
– Push-Button Wake-Up and Reset with
Adjustable Timers
– Power Path Management for Powering the
System and Charging the Battery
– Power Path Management enables <50 nA Ship
Mode Battery Quiescent Current for Longest
Shelf Life
– Battery Charger Operates from 3.4 V – 5.5 V
(5.5-V OVP / 20-V Tolerant)
– Dedicated Pins for Input Current Limit, Charge
Current, Termination Current, and Status
Output
2
• I C Communication Control
– Charge Voltage and Current
– Termination Threshold
– Input Current Limit
– VINDPM Threshold
– Timer Options
– Load Switch Control
– System Output Voltage Adjustment
– LDO Output Voltage Adjustment
• Safety-Related Certification:
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
Copyright © 2021 Texas Instruments Incorporated
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Highly Integrated Battery Charge Management Solution
Q
for Wearables and IoT
IN
Product Folder Links:
SLUSDA7A – APRIL 2018 – REVISED JANUARY 2021
SLUSDA7A – APRIL 2018 – REVISED JANUARY 2021
– TUV IEC 62368-1 Certification
2 Applications
• Smart Watches and other Wearable Devices
• Fitness Accessories
• Health Monitoring Medical Accessories
• Rechargeable Toys
3 Description
The BQ25121A is a highly integrated battery charge
management IC that integrates the most common
functions for wearable devices: Linear charger,
regulated output, load switch, manual reset with timer,
and battery voltage monitor. The integrated buck
converter is a high efficiency, low I
DCS-Control ™ that extends light load efficiency down
to 10-µA load currents. The low quiescent current
during operation and shutdown enables maximum
battery life. The device supports charge currents from
5 mA to 300 mA.
Device Information
PART NUMBER PACKAGE
BQ25121A DSBGA (25)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
PG
IN
BQ25121A
GND
CD
HOST
SDA
SCL
INT
RESET
LSCTRL
MR
IPRETERM
ISET
ILIM
Simplified Schematic
BQ25121A
BQ25121A
BQ25121A
switcher using
Q
(1)
BODY SIZE (NOM)
2.50 mm x 2.50 mm
Unregulated
PMID
Load
VINLS
SYS
MCU /
SW
SYSTEM
LS / LDO
<100mA
Load
BAT
TS
NTC
IN
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