BQ24618_15 Datasheet, PDF (1/43 Pages) Texas Instruments – System Power Selector and Low

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bq24618
SLUSA55B – OCTOBER 2010 – REVISED APRIL 2015
bq24618 Stand-Alone USB-Friendly Synchronous Switched-Mode Li-Ion or Li-Polymer
Battery Charger With System Power Selector and Low I_q
1 Features
2 Applications
•1 USB-Friendly 4.7-V to 28-V Input Operating
Range
• Stand-Alone Charge Controller to Support 1 to 6
Li-Ion or Li-Polymer Battery Cells
• Up to 10-A 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 Overvoltage Protection
– Battery Thermistor Sense Hot/Cold Charge
Suspend
– Battery Detection
– Reverse-Protection Input FET
– Programmable Safety Timer
– Charge Overcurrent Protection
– Battery Short Protection
– Battery Overvoltage Protection
– Thermal Shutdown
• Status Outputs
– Adapter Present
– Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck Converter
• 30-ns Driver Dead-Time and 99.5% Maximum
Effective Duty Cycle
• Energy Star Low Quiescent Current I_q
– < 15-µA Off-State Battery Discharge Current
– < 1.5-mA Off-State Input Quiescent Current
• Tablet PCs
• Smart Phones
• Portable Media Players, Navigation Devices,
Notebooks and Ultra-Mobile PCs
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
3 Description
The bq24618 device is highly integrated Li-ion or Li-
polymer switched-mode battery-charge controller.
The bq24618 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 supports charge currents up to 10 A. 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24618
VQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
ADAPTER
Simplified Schematic
ACP ACN
ACDRV BATDRV
CE
VREF
ISET1
ISET2
ACSET
HIDRV
PH
LODRV
SYSTEM
Battery
pack
VREF
ADAPTER
STAT1
STAT2
PG
TS
SRP
SRN
VFB
TTC
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.