BQ24152 Datasheet, PDF (1/38 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

bq24152
www.ti.com ...................................................................................................................................................................................................... SLUS847 – JUNE 2008
Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and
USB-OTG Support
FEATURES
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•2 Charge Faster than Linear Chargers
• High-Accuracy Voltage and Current Regulation
– Input Current Regulation Accuracy: ±5%
(100 mA and 500 mA)
– Charge Voltage Regulation Accuracy:
±0.5% (25°C), ±1% (0°C-125°C)
– Charge Current Regulation Accuracy: ±5%
• High-Efficiency Mini-USB/AC Battery Charger
for Single-Cell Li-Ion and Li-Polymer Battery
Packs
• 20-V Absolute Maximum Input Voltage Rating
• 6-V Maximum Operating Input Voltage
• Built-In Input Current Sensing and Limiting
• Integrated Power FETs for Up To 1.25-A
Charge Rate
• Programmable Charge Parameters through
I²C™ Interface (up to 3.4 Mbps):
– Input Current
– Fast-Charge/Termination Current
– Charge Voltage (3.5 V to 4.44 V)
– Safety Timer
– Termination Enable
• Synchronous Fixed-Frequency PWM
Controller Operating at 3 MHz with 0% to
99.5% Duty Cycle
• Automatic High Impedance Mode for Low
Power Consumption
• Safety Timer with Reset Control
• Reverse Leakage Protection Prevents Battery
Drainage
• Thermal Regulation and Protection
• Input/Output Overvoltage Protection
• Status Output for Charging and Faults
• USB Friendly Boot-Up Sequence
• Automatic Charging
• Power up System without Battery
• Boost Mode Operation for USB OTG:
– Input Voltage Range (from Battery): 2.5 V to
4.5 V
– Output Voltage for VBUS: 5.05 V
• 1.976 x 1.924mm 20-Pin WCSP Package
APPLICATIONS
• Mobile and Smart Phones
• MP3 Players
• Handheld Devices
DESCRIPTION
The bq24152 is a compact, flexible, high-efficiency,
USB-friendly switch-mode charge management
device for single-cell Li-ion and Li-polymer batteries
used in a wide range of portable applications. The
charge parameters can be programmed through an
I²C interface. The bq24152 integrates a synchronous
PWM controller, power MOSFETs, input current
sensing, high-accuracy current and voltage
regulation, and charge termination, into a small
WCSP package.
The bq24152 charges the battery in three phases:
conditioning, constant current and constant voltage.
The input current is automatically limited to the value
set by the host. Charge is terminated based on
user-selectable minimum current level. A safety timer
with reset control provides a safety backup for I²C
interface. During normal operation, bq24152
automatically restarts the charge cycle if the battery
voltage falls below an internal threshold and
automatically enters sleep mode or high impedance
mode when the input supply is removed. The charge
status is reported to the host using the I²C interface.
Typical Application Circuit
VBUS
C IN
VBUS
SW
U1
1 mF
bq24152
PMID
BOOT
VAUX
10 kW
SCL
10 kW
10 kW
C IN
4.7 mF
I2C BUS
SCL
PGND
CSIN
CSOUT
SDA
STAT
OTG
SDA
STAT
OTG
AUXPWR
VREF
10 kW
HOST
LO 1.0 mH
C _BOOT
10nF
R _SNS
CO
1 0mF
0.1 mF
C _VREF
1 mF
C _AUXPWR
1mF
PACK +
+
PACK -
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
I2C is a trademark of Philips Electronics.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated