BQ24618 Datasheet, PDF (1/36 Pages) Texas Instruments – Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger

bq24618
www.ti.com
SLUSA55 – OCTOBER 2010
Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery
Charger with System Power Selector and Low I_q
Check for Samples: bq24618
FEATURES
1
• USB Friendly 4.7V-28V Input Operating Range
• Stand-alone Charge Controller to Support 1-6
Li-Ion or Li-Polymer Battery Cells
• Up-to 10A Charge Current and Adapter Current
• 600 kHz NMOS-NMOS Synchronous Buck
Converter
• 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
• Safety Protection
– Input Over-Voltage Protection
– Battery Thermistor Sense Hot/Cold Charge
Suspend
– 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 99.5% Max
Effective Duty Cycle
• 24-pin, 4×4-mm² QFN package
• Energy Star Low Quiescent Current I_q
– < 15 µA Off-State Battery Discharge current
– < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
• Tablet PC
• Smart Phones
• Portable Media Players, Navigation Devices,
Notebook and Ultra-Mobile PC
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
DESCRIPTION
The bq24618 is highly integrated Li-ion or Li-polymer
switch-mode battery charge controller. It offers a
constant-frequency synchronous switching PWM
controller with high accuracy charge current and
voltage regulation, charge preconditioning,
termination, adapter current regulation and charge
status monitoring.
The bq24618 operates from either a USB port or AC
adapter and support the charge currents up to 10A.
The device 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
for charge termination. The bq24618 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 PIN-OUT
24 23 22 21 20 19
ACN ¹
18 REGN
ACP ²
ACDRV 3
CE 4
STAT1 ⁵
bq24618
QFN-24
TOP VIEW
17 GND
16 ACSET
15 ISET2
14 SRP
TS 6
13 SRN
7 8 9 10 11 12
1
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