BQ24630 Datasheet, PDF (1/33 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System Power Selector and Low Iq

bq24630
www.ti.com
SLUS894 – JANUARY 2010
Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System
Power Selector and Low I_q
Check for Samples: bq24630
FEATURES
1
• 300 kHz NMOS-NMOS Synchronous Buck
Converter
• Stand-alone Charger Specifically for Lithium
Phosphate
• 5V–28V VCC Input Operating Range, Support
1-7 Battery Cells
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
• Integration
– Automatic System Power Selection from
Adapter or Battery
– Internal Loop Compensation
– Internal Soft Start
– Dynamic Power Management (DPM)
• Safety Protection
– Input Over-Voltage Protection
– Battery Thermistor Sense Suspend Charge
at Hot/Cold and Automatically I_CHARGE/8 at
Hot/Cold or Warm/Cool
– Battery Detection
– Reverse Protection Input FET
– Programmable Safety Timer
– Charge Over-Current Protection
– Battery Short Protection
– Battery Over-Voltage Protection
– Thermal Shutdown
• Status Outputs
– Adapter Present
– Charger Operation Status
• Charge Enable Pin
• 6V Gate Drive for Synchronous Buck
Converter
• 30ns Driver Dead-time and 99.95% Max
Effective Duty Cycle
• 24-Pin 4×4-mm² QFN Package
• Energy Star Low Quiescent Current I_q
– < 15 mA Off-State Battery Discharge current
– < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
• Power Tool and Portable Equipment
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
• Netbook, Mobile Internet Device and
Ultra-Mobile PC
DESCRIPTION
The bq24630 is highly integrated switch-mode battery
charge controller designed specifically for Lithium
Phosphate battery. It offers a constant-frequency
synchronous PWM controller with high accuracy
current and voltage regulation, charge
preconditioning, termination, adapter current
regulation, and charge status monitoring.
The bq24630 charges the battery in three phases:
preconditioning, constant current, and constant
voltage. Charge is terminated when the current
reaches a minimum user-selectable level. A
programmable charge timer provides a safety
backup. The bq24630 automatically restarts the
charge cycle if the battery voltage falls below an
internal threshold, and enters a low-quiescent current
sleep mode when the input voltage falls below the
battery voltage.
PACKAGE AND PINOUT
24 23 22 21 20 19
ACN 1
ACP 2
ACDRV 3
CE 4
STAT1 5
TS 6
OAT
(bq24630)
QFN-24
18 REGN
17 GND
16 ACSET
15 ISET 2
14 SRP
13 SRN
7 8 9 10 11 12
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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 © 2010, Texas Instruments Incorporated