Texas Instruments BQ25120F3A Manual

BQ25120F3A 700-nA Low I

1 Features

• Increases system operation time between charges
– Configurable 300-mA buck regulator
(1.8-V default)
– 700-nA (typical) Iq with buck converter enabled
(no load)
– Configurable load switch or 100-mA LDO
output (LDO by default. VLDO 1.8-V)
– Up to 300-mA charge current for fast charging.
2
I C programmable up to 200 mA, external
resistor setting for 200 mA to 300 mA.
– 0.5% Accurate battery voltage regulation
(configurable from 3.6 V to 4.65 V in 10-mV
steps) 4.35-V default
– Configurable termination current down to
500 µA
– Simple voltage based battery monitor
– Watchdog timer disabled
– TS WARM fault disabled (no reduction in
battery regulation voltage)
• Highly integrated solution with small footprint
– 2.5-mm x 2.5-mm WCSP Package and six
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
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.
Highly Integrated Battery Charge Management Solution
Q
for Wearables and IoT

2 Applications

• Smart watches and other wearable devices
• Fitness accessories
• Health monitoring medical accessories
• Rechargeable toys

3 Description

The BQ25120F3A 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
using DCS-Control
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.
PART NUMBER
BQ25120F3A
(1)
IN
SLUSDI4A – OCTOBER 2018 – REVISED APRIL 2021
™ that extends light load efficiency
Device Information
PACKAGE
DSBGA (25)
For all available packages, see the orderable addendum at
the end of the data sheet.
PG
IN
BQ2512x
GND
CD
HOST
SDA
SCL
INT
RESET
LSCTRL
MR
IPRETERM
ISET
ILIM
Simplified Schematic
BQ25120F3A
switcher
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
Copyright © 2016, Texas Instruments Incorporated