BQ24707 Datasheet, PDF (1/36 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection

bq24707
bq24707A
www.ti.com
SLUSA78B – JULY 2010 – REVISED MARCH 2011
1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and
Advanced Circuit Protection
Check for Samples: bq24707, bq24707A
FEATURES
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• SMBus Host-Controlled NMOS-NMOS
Synchronous Buck Converter with
Programmable 615kHz, 750kHz, and 885kHz
Switching Frequency
• Real Time System Control on ILIM Pin to Limit
Charge Current
• Enhanced Safety Features for Over Voltage
Protection, Over Current Protection, Battery,
Inductor, and MOSFET Short Circuit Protection
• Programmable Input Current, Charge Voltage,
Charge Current Limits
– ±0.5% Charge Voltage Accuracy up to 19.2V
– ±3% Charge Current Accuracy up to 8.128A
– ±3% Input Current Accuracy up to 8.064A
– ±2% 20x Adapter Current or Charge Current
Output Accuracy
• Programmable Adapter Detection and
Indicator
• Independent Comparator with Internal
Reference
• Integrated Soft Start
• Integrated Loop Compensation
• AC Adapter Operating Range 5V-24V
• 15µA Off-State Battery Discharge Current
• 20-pin 3.5 x 3.5 mm² QFN Package
• bq24707: ACOK delay default 1.3s
• bq24707A: ACOK delay default 1.2ms
APPLICATIONS
• Portable Notebook Computers, UMPC,
Ultra-Thin Notebook, and Netbook
• Personal Digital Assistant
• Handheld Terminal
• Industrial and Medical Equipment
• Portable Equipment
DESCRIPTION
The bq24707 and bq24707A are high-efficiency,
synchronous battery charger, offering low component
count for space-constraint, multi-chemistry battery
charging applications.
SMBus controlled input current, charge current, and
charge voltage DACs allow for very high regulation
accuracies that can be easily programmed by the
system power management micro-controller.
The IC uses the internal input current register or
external ILIM pin to throttle down PWM modulation to
reduce the charge current.
The IC provides an IFAULT output to alarm if any
MOSFET fault or input over current occurs. This
alarm output allows users to turn off input power
selectors when the fault occurs. Meanwhile, an
independent comparator with internal reference is
available to monitor input current, output current, or
output voltage.
The IC charges one, two, three, or four series Li+
cells, and is available in a 20-pin, 3.5×3.5 mm² QFN
package.
20 19 18 17 16
ACN 1
ACP 2
CMPOUT 3
CMPIN 4
ACOK 5
bq24707
bq24707A
15 LODRV
14 GND
13 SRP
12 SRN
11 IFAULT
6 7 8 9 10
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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.
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