BQ24742 Datasheet, PDF (1/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

bq24741, bq24742
www.ti.com
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
Li-Ion or Li-Polymer Battery Charger with Low I_q and Accurate Trickle Charge
Check for Samples :bq24741 bq24742
FEATURES
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• NMOS-NMOS Synchronous Buck Converter
• Resistor-Programmable Switching Frequency
between 300 kHz and 800 kHz
• 9 V-24 V Input Voltage Operation Range
• Support Two to Four Cells
• Analog Inputs with Ratiometric Programming
via Resistors or DAC/GPIO
– Charge Voltage (4-4.512 V/cell)
– Charge Current (up to 10 A)
– Adapter Current Limit for DPM
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
– ±2% Input Current Sense Amp Accuracy
• 150 mA Trickle-charge Current with ±33%
Accuracy Down to Zero Battery Voltage
• Safety Protection
– Input Overvoltage Protection
– Battery Overvoltage Protection
– Charger Overcurrent Protection
– Thermal Shutdown Protection
– FET/Inductor/Battery Short Protection
• Status and Monitoring Outputs
– Adapter Present Indicator
– Programmable Input Power Detect with
Adjustable Threshold
– Dynamic Power Management (DPM) with
Status Indicator
– Current Drawn from Input Source
• Charge Enable Pin
• Internal Soft-Start and Loop Compensation
• 25 ns Minimum Driver Dead-Time and 99.5%
Maximum Effective Duty Cycle
• 28-pin, 5x5-mm² QFN package
• Energy Star Low Quiescent Current I_q
– < 10 μA Off-State Battery Discharge Current
– < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
• Notebook and Ultra-Mobile PC
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems
DESCRIPTION
The bq24741/2 is a high-efficiency, synchronous
battery charger with integrated compensation,
offering low component count for space-constrained
Li-ion or Li-polymer battery charging applications.
Ratiometric charge current and voltage programming
allows high regulation accuracies, and can be either
hardwired with resistors or programmed by the
system power-management microcontroller using a
DAC or GPIOs.
The bq24741/2 charges two, three, or four series Li+
cells, supporting up to 10 A of charge current, and is
available in a 28-pin, 5x5-mm² thin QFN package.
Text for space
Text for space
CE ¹
ACN ²
ACP ³
LPMOD ⁴
ACDET ⁵
ACSET ⁶
LPREF ⁷
28 27 26 25 24 23 22
bq24741/2
QFN-28
TOP VIEW
21 _DPMDET
20 _CELLS
19 _CSP
18 CSN
17 _BAT
16 _ISET
15 _IADAPT
8 9 10 11 12 13 14
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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.
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 © 2009, Texas Instruments Incorporated