BQ25120F3A 700-nA Low I
Q
Highly Integrated Battery Charge Management Solution
for Wearables and IoT
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.
I
2
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
IN
(5.5-V OVP / 20-V tolerant)
– Dedicated pins for input current limit, charge
current, termination current, and status output
• I
2
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
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
Q
switcher
using 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
BODY SIZE (NOM)
BQ25120F3A
DSBGA (25)
2.50 mm x 2.50 mm
(1)
For all available packages, see the orderable addendum at
the end of the data sheet.
GND
HOST
SDA
SCL
INT
SW
BAT
MR
BQ2512x
MCU /
SYSTEM
-
+
NTC
TS
LS / LDO
<100mA
Load
IN
SYS
RESET
LSCTRL
VINLS
Unregulated
Load
PMID
PG
IPRETERM
ISET
ILIM
CD
IN
Copyright © 2016, Texas Instruments Incorporated
Simplified Schematic
SLUSDI4A – OCTOBER 2018 – REVISED APRIL 2021
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.
