BQ24172RGYR ,1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-alone Battery Charge 24-VQFN -40 to 85Features – ±4% Input Current Regulation• <15-μA Battery Current With Adapter Removed1• 1.6-MHz Sync ..
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BQ24172RGYR
1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-alone Battery Charge
L:3.3mH
12-VAdapter
VBATSW
0.047m
ACP
CIN
2.2µ
ISET
CMSRC
PVCCACN
RIN
BATDRV0.1m
C11: 0.1µ
C12: 0.1µ
C4:10µ
R12
4.02 k Q2R14
1 k
0.1m32.4k
AVCC
ACSET
100k
22.1k
VREF
VBAT
bq24170 : 10 mAC
R11
4.02 k:10 mSR
VREF
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bq24170, bq24172SLUSAD2C –NOVEMBER 2010–REVISED APRIL 2015
bq2417x 1.6-MHz Synchronous Switched-Mode Li-Ion and Li-Polymer Stand-Alone Battery
Charger With Integrated MOSFETs and Power Path Selector Features – ±4% Input Current Regulation <15-μA Battery Current With Adapter Removed 1.6-MHz Synchronous Switched-Mode Charger
with 4-A Integrated N-MOSFETs • <1.5-mA Input Current With Adapter Present and
Charge Disabled• Upto 94% Efficiency 30-V Input Rating with Adjustable Overvoltage
2 ApplicationsProtection Tablet PCs– 4.5-Vto 17-V Input Operating Voltage Range Portable Data Capture Terminals• Battery Charge Voltage Portable Printers– bq24170: 1-,2-,or 3-Cell with 4.2 V/Cell Medical Diagnostics Equipment– bq24172: Adjustable Charge Voltage Battery Bay Chargers• High Integration Battery Backup Systems– Automatic Power Path Selector Between
Adapter and Battery
3 Description– Dynamic Power Management The bq2417x deviceisa highly integrated stand-– Integrated 20-V Switching MOSFETs alone Li-Ion and Li-Polymer switched-mode battery Integrated Bootstrap Diode charger with two integrated N-channel power
MOSFETs. The device offersa constant-frequency– Internal Digital Soft Start synchronous PWM controller with high-accuracy• Safety regulation of input current, charge current, and Thermal Regulation Loop Throttles Back voltage. The bq2417x closely monitors the battery
Currentto LimitTJ= 120°C pack temperatureto allow charge onlyina preset
temperature window. The bq24170 charges one, two,– Thermal Shutdown or three cells (selected by CELL pin), and the– Battery Thermistor Sense Hot/Cold Charge bq24172is adjustable forupto three series Li+ cells.Suspend and Battery Detect Adjustable Input Overvoltage Protection
Device Information(1)– Cycle-by-Cycle Current Limit• Accuracy– ±0.5% Charge Voltage Regulation
(1) Forall available packages, see the orderable addendumat– ±4% Charge Current Regulation
the endofthe data sheet.
Typical Application Schematic
