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BQ24171RGYR
JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger
L:3.3?H
12VAdapter
C9, C10
10?
VBAT
BTST
REGN
0.047?
ACP
CIN
2.2?
ISET
VREF
CMSRC
TTC
OVPSET
PVCCACN
RIN
BATDRV
0.1?
C11: 0.1µ
C12: 0.1µ
C4:10µ
C2: 1µ
R11
4.02k
R12
4.02k
ACDRV Q2R14
0.1?
232k
32.4kR1
1000k
100k
AVCC
ACSET
100k
22.1k
VREF
VBAT
VREF
bq24171
L:3.3?H
C9, C10
10?
VBAT
BTST
REGN
0.047?
ACP
CIN
2.2?
ISET
VREF
CMSRC
TTC
OVPSET
PVCCACN
RIN: 10mAC
BATDRVBATDRV
0.1?
C11: 0.1µ
C12: 0.1µ
C4:10µ
C2: 1µ
R11
4.02k
R12
4.02k
ACDRV R:10mSR Q2R14
0.1?
232k
32.4kR1
1000k
100k
AVCC
ACSET
100k
22.1k
VREF
VBAT
VREF
10?10?
System
299 kWProduct
Folder
Sample &
Buy
Technical
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Community
bq24171SLUSAF2C –FEBRUARY 2011–REVISED APRIL 2015
bq24171 JEITA-Compliant Stand-Alone, Switched-Mode Li-Ion and
Li-Polymer Battery Charger With Integrated MOSFETs and Power Path Selector Features 2 Applications JEITA-Compatible Battery Temperature Sensing • Tablet PCs 1.6-MHz Synchronous Switched-Mode Charger • Netbooks and Ultra-Mobile Computers
With 4-A Integrated N-MOSFETs • Portable Data Capture Terminals Upto 94% Efficiency • Portable Printers 30-V Input Rating With Adjustable Overvoltage • Medical Diagnostics Equipment
Protection • Battery Bay Chargers 4.5-Vto 17-V Input Operating Voltage • Battery Backup Systems Battery Charge Voltage
Description– Adjustable Charge Voltageupto 3-Series
Cells The bq24171 deviceis highly integrated stand-alone
Li-ion and Li-polymer switched-mode battery charger• High Integration with two integrated N-channel power MOSFETs. The– Automatic Power Path Selector Between device offers a constant-frequency synchronousAdapter and Battery PWM controller with high-accuracy regulationof input Dynamic Power Management current, charge current, and voltage. The bq24171
closely monitors the battery pack temperature and– Integrated 20-V Switching MOSFETs allows charge only ina JEITA profile-compatible– Integrated Bootstrap Diode window witha lower charge rateata low temperature Internal Loop Compensation anda lower charge voltageata high temperature.
The bq24171 device charges the batteryin three– Internal Digital Soft Start phases: preconditioning, constant current, and• Safety constant voltage. The bq24171 charges up to 3-– Thermal Regulation Loop Throttles Back series cells withan adjustable cell voltage.
Currentto LimitTJ= 120°C
Device Information(1)– Thermal Shutdown– Battery Thermistor Sense Hot/Cold ChargeSuspend and Battery Detect
(1) Forall available packages, see the orderable addendumat– Input Overvoltage Protection With
the endofthe data sheet.Programmable Threshold Cycle-by-Cycle Current Limit
Typical Application Schematic Accuracy ±0.5% Charge Voltage Regulation ±4% Charge Current Regulation ±4% Input Current Regulation Current With Adapter Input Current With Adapter Package
