BQ24257 Datasheet, PDF (1/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

bq24257
bq24258
www.ti.com
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
2A Single Input I²C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated
Current Sense Resistor
Check for Samples: bq24257, bq24258
FEATURES
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•234 High-efficiency Switch-mode Charger with
Integrated Current Sense Resistor
• BC1.2 D+, D– Detection with Dead Battery
Provision (DBP) Pin to Sync with External
USB-PHI
• USB Charging Compliant
• Selectable Input Current Limit of 100 mA,
150 mA, 500 mA, 900 mA. 1.5 A, and 2 A
• In Host Mode (after I²C™ Communication and
Before Watchdog Timer Times Out)
– Programmable Battery Charge Voltage
(V_BATREG)
– Programmable Battery Charge Current
(I_CHG)
– Programmable Input Current Limit (I_LIM)
– Programmable Input Voltage Based
Dynamic Power Management Threshold
(V_{IN_DPM})
– Programmable Input Overvoltage
Protection Threshold (V_OVP)
– Programmable Safety Timer.
• In Standalone Mode (before I²C™
Communication and After Watchdog Timer
Times Out)
– Resistor Programmable I_CHG up to 2 A With
Current Monitoring Output (I_SET)
– Resistor Programmable I_LIM up to 2 A With
Current Monitoring Output (I_LIM)
– Resistor Programmable V_{IN_DPM} (VDPM)
• Watchdog Timer with Disable Bit
• Integrated 4.9 V, 50 mA LDO
• Complete System Level Protection
– Input UVLO, Input Overvoltage Protection
(OVP), Battery OVP, Sleep Mode, V_{IN_DPM}
– Input Current Limit
– Charge Current Limit
– Thermal Regulation and Thermal Shutdown
– Voltage Based, JEITA Compatible NTC
Monitoring Input
– Safety Timer
• 20 V Maximum Input Voltage Rating
• 10.5 V Maximum Operating Input Voltage
• Low R_DS(on) Integrated Sense Resistor for up to
2 A Charging Rate
• Open Drain Status Outputs
• Synchronous Fixed-frequency PWM Controller
Operating at 3 MHz for Small Inductor Support
• AnyBoot Robust Battery Detection Algorithm
• Charge Time Optimizer for Improved Charge
Times at any Given Charge Current
APPLICATIONS
• Mobile Phones, Smart Phones
• MP3 Players
• Handheld Devices
• Portable Media Player
DESCRIPTION
The bq2425x is a highly integrated single-cell Li-Ion battery charger with integrated current sense resistor
targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single
input that operates from either a USB port or AC wall adapter for a versatile solution. BC1.2 compatible D+, D-
detection allows for recognition of CDP, DCP, SDP, and non-standard USB adapters. The use of an accessory
dead battery provision (DBP) pin allows for the system to sync a dead battery state in order to enable or disable
the BC1.2 detection in the event of an external USB-PHI.
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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.
NanoFree is a trademark of Texas Instruments.
2
I²C is a trademark of NXP B.V. Corporation.
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All other trademarks are the property of their respective owners.
4
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated