BQ24620 Datasheet, PDF (1/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq

bq24620
www.ti.com
SLUS893 – MARCH 2010
Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low I_q
Check for Samples: bq24620
FEATURES
1
• 300 kHz NMOS-NMOS Synchronous Buck
Converter
• Stand-alone Charger Designed Specifically for
Lithium Phosphate
• 5V–28V VCC Operating Range, Support 1-7
Battery Cells
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
• Integration
– Internal Loop Compensation
– Internal Soft Start
• Safety
– Input Over-Voltage Protection
– Battery Thermistor Sense Suspend Charge
at Hot/Cold Charge Suspend and
Automatically I_CHARGE/8 at WARM/COOL
– Battery Detection
– Built-in 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
• 16-Pin 3.5×3.5-mm QFN Package
• Energy Star Low Iq
– < 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 bq24620 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, and charge status
monitoring.
The bq24620 charges the battery in three phases:
preconditioning, constant current, and constant
voltage. Charge is terminated when the current
reaches a minimum level. An internal charge timer
provides a safety backup. The bq24620 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
16 15 14
13
VCC 1
2
CE
STAT ³
TS 4
OAR
(bq24620)
QFN-16
TOP VIEW
12 _REGN
11 GND
10 SRP
9 SRN
5
6
7
8
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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