Texas Instruments BQ25155 Manual

2
BQ25155 I C Controlled 1-Cell 500-mA Linear Battery Charger With 10-nA Ship Mode,
Power Path With Regulated System (PMID) Voltage, ADC, and LDO
1 Features
• Linear battery charger with 1.25-mA to 500-mA
fast charge current range
2
– 0.5% Accurate I C programmable battery
regulation voltage ranging from 3.6 V to 4.6 V in
10-mV steps
– Configurable termination current supporting
down to 0.5 mA
– 20-V Tolerant input with typical 3.4-V to 5.5-V
input voltage operating range
– Programmable thermal charging profile, fully
configurable hot, warm, cool and cold
thresholds
• Power Path management for powering system and
charging battery
2
– I C Programmable regulated system voltage
(PMID) ranging from 4.4V to 4.9V in addition to
battery voltage tracking and Input pass-though
options
– Dynamic power path management optimizes
charging from weak adapters
2
– Advanced I C control allows host to disconnect
the battery or adapter as needed
2
• I C Configurable load switch or up to 150-mA LDO
output
– Programmable range from 0.6 V to 3.7 V in
100-mV steps
• Ultra low Iddq for extended battery life
– 10-nA Ship mode battery Iq
– 400-nA Iq While powering the system (PMID
and VDD on)
• One push-button wake-up and reset input with
adjustable timers
– Supports system power cycle and HW reset
• 16-Bit ADC
– Monitoring of charge current, battery thermistor
and battery, input and system (PMID) voltages
– General purpose ADC input
• Always on 1.8-V VDD LDO supporting loads up to
10 mA
• Safety-Related Certifications
– TUV IEC 62368 Certification
• 20-Pin 2-mm x 1.6-mm CSP package
2
• 12-mm Total solution size
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.
SLUSDO1B – JUNE 2019 – REVISED AUGUST 2023
2 Applications
• Headsets, earbuds and hearing aids
• Smart watches and smart trackers
• Wearable fitness and activity monitors
• Blood glucose monitors
3 Description
The BQ25155 is a highly integrated battery charge
management IC that integrates the most common
functions for wearable, portable and small medical
devices, namely a charger, a regulated output voltage
rail for system power, ADC for battery and system
monitoring, a LDO, and push-button controller.
The BQ25155 IC integrates a linear charger with
Power Path that enables quick and accurate charging
for small batteries while providing a regulated voltage
to the system. The regulated system voltage (PMID)
output may be configured through I
recommended operating condition of downstream IC's
and system loads for optimal system operation.
Device Information
PART NUMBER PACKAGE
BQ25155 DSBGA (20)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
BQ25155
USB
IN
C
4
I2C Bus
CE
LP
Host
INT
PG
ADCIN
MR
GND
Simplified Schematic
BQ25155
2
C based on the
(1)
BODY SIZE (NOM)
2.00 mm x 1.60 mm
PMID System
C
5
VINLS
<150mA
LS/LDO
Load
C
3
<10mA
VDD
Load
C
1
VIO
BAT
C
2
+
NTC
TS
±