BQ24171_15 Datasheet, PDF (1/39 Pages) Texas Instruments – bq24171 JEITA-Compliant Stand-Alone, Switched-Mode Li-Ion and Li-Polymer Battery Charger With Integrated MOSFETs and Power Path Selector

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bq24171
SLUSAF2C – 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
1 Features
•1 JEITA-Compatible Battery Temperature Sensing
• 1.6-MHz Synchronous Switched-Mode Charger
With 4-A Integrated N-MOSFETs
• Up to 94% Efficiency
• 30-V Input Rating With Adjustable Overvoltage
Protection
– 4.5-V to 17-V Input Operating Voltage
• Battery Charge Voltage
– Adjustable Charge Voltage up to 3-Series
Cells
• High Integration
– Automatic Power Path Selector Between
Adapter and Battery
– Dynamic Power Management
– Integrated 20-V Switching MOSFETs
– Integrated Bootstrap Diode
– Internal Loop Compensation
– Internal Digital Soft Start
• Safety
– Thermal Regulation Loop Throttles Back
Current to Limit T_J = 120°C
– Thermal Shutdown
– Battery Thermistor Sense Hot/Cold Charge
Suspend and Battery Detect
– Input Overvoltage Protection With
Programmable Threshold
– Cycle-by-Cycle Current Limit
• Accuracy
– ±0.5% Charge Voltage Regulation
– ±4% Charge Current Regulation
– ±4% Input Current Regulation
• Less Than 15-μA Battery Current With Adapter
Removed
• Less Than 1.5-mA Input Current With Adapter
Present and Charge Disabled
• Small QFN Package
– 24-Pin, 5.5-mm × 3.5-mm QFN Package
2 Applications
• Tablet PCs
• Netbooks and Ultra-Mobile Computers
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Backup Systems
3 Description
The bq24171 device is highly integrated stand-alone
Li-ion and Li-polymer switched-mode battery charger
with two integrated N-channel power MOSFETs. The
device offers a constant-frequency synchronous
PWM controller with high-accuracy regulation of input
current, charge current, and voltage. The bq24171
closely monitors the battery pack temperature and
allows charge only in a JEITA profile-compatible
window with a lower charge rate at a low temperature
and a lower charge voltage at a high temperature.
The bq24171 device charges the battery in three
phases: preconditioning, constant current, and
constant voltage. The bq24171 charges up to 3-
series cells with an adjustable cell voltage.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24171
VQFN (24)
5.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
12V Adapter
R_IN
2
C_IN
2.2?
VBAT
D2
D1
R1
10
Q1
Q2
R_AC: 10m
C12: 0.1µ
C11: 0.1µ
R11
4.02k
R12
4.02k
C2: 1µ
VREF
R4
100k
R5
22.1k
ACN
ACP
CMSRC
PVCC
BATDRV
VREF
R2
232k
R3
32.4k
ACDRV
VREF
SW
bq24171
ISET
BTST
ACSET
REGN
R6
1000k
R7
100k
R_T
103AT
VREF
R8
2.2k
R9
6.8k
AVCC
C1
1µ
C3: 0.1?
OVPSET
TTC
PGND
SRP
SRN
R10
1.5k
VREF
D3
TS
FB
THERMAL
STAT PAD
System
C4: 10µ
R14
Q3
1k
L: 3.3?H R_SR:10m
VBAT
C5
0.047?
C7
0.1?
C6
1?
C8
0.1?
C9, C10
10? 10?
R2
299 kW
R2
100 kW
1
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.