BQ24157 Datasheet, PDF (1/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

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bq24157
SLUSB80 – SEPTEMBER 2012
Fully Integrated Switch-Mode Charger
With USB Compliance and USB-OTG Support
Check for Samples: bq24157
FEATURES
1
•23 Power Up System without Battery
• 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 to 125°C)
– Charge Current Regulation Accuracy: ±5%
• Input Voltage Based Dynamic Power
Management (VIN DPM)
• Bad Adaptor Detection and Rejection
• Safety Limit Register for Maximum Charge
Voltage and Current Limiting
• High-Efficiency Mini-USB/AC Battery Charger
for Single-Cell Li-Ion and Li-Polymer Battery
Packs
• 20-V Absolute Maximum Input Voltage Rating
• 6.5-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™ Compatible Interface (up to 3.4 Mbps):
– Input Current Limit
– VIN DPM Threshold
– Fast-Charge/Termination Current
– Charge Regulation Voltage (3.5 V to 4.44 V)
– Low Charge Current Mode Enable/Disable
– Termination Enable/Disable
• Synchronous Fixed-Frequency PWM
Controller Operating at 3 MHz With 0% to
99.5% Duty Cycle
• Automatic High Impedance Mode for Low
Power Consumption
• Robust Protection
– 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
• Boost Mode Operation for USB OTG
– Input Voltage Range (from Battery): 3.2 V to
4.5 V
• 2.1 mm x 2 mm 20-Pin WCSP Package
APPLICATIONS
• Mobile and Smart Phones
• MP3 Players
• Handheld Devices
Figure 1. Typical Application Circuit
VBUS
CIN
1 mF
VBUS
SW
U1
bq24157
VAUX
PMID
CIN 4.7 mF
SCL
SDA
STAT
10 kW 10 kW
10 kW
I2C BUS
OTG
10 kW ^CD
HOST
10 kW
SCL
SDA
STAT
OTG
CD
BOOT
PGND
CSIN
CSOUT
VREF
LO 1.0 mH
CBOOT
33 nF
CCSIN
RSNS
0.1 mF
CVREF
1 mF
CCSOUT
0.1 mF
CO1
22 mF
VBAT
CO2
33 mF
PACK+
+
PACK–
1
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.
NanoFree is a trademark of Texas Instruments.
2
I²C is a trademark of NXP B.V. Corporation.
3
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 © 2012, Texas Instruments Incorporated