ISL6297 Datasheet, PDF (1/16 Pages) Intersil Corporation – Li-ion/Li Polymer Battery Charger

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Datasheet
September 27, 2005
ISL6297
FN9215.0
Li-ion/Li Polymer Battery Charger
The ISL6297 is a Dual-Mode Lithium Ion battery charger
optimized for cellular phone travel charger applications. It
uses Intersil’s patent-pending dual-mode charge
technology to minimize the heat normally generated in a
linear charger. By minimizing the heat generation, the
ISL6297 can be placed inside the connector of the travel
charger to completely remove the influence of the adapter
cable on the charging performance.
The ISL6297 is an enhancement of the original ISL6292B.
New features include improved accuracy, pre-charge circuit
verification, and enhanced LED indicator function.
Working with a current-limited AC/DC converter, the dual-
mode charger charges a Li-ion battery with the same current
profile as a traditional linear charger. The constant charge
current is determined by the current limit of the AC/DC
converter. The constant output voltage is fixed at 4.2V. When
the battery voltage is below 2.8V, the charger preconditions
the battery with a low trickle-charge current. The charge
status is indicated by a bi-color LED. A safety timer prevents
charging a dead battery for an excessively long period.
The ISL6297 also features THERMAGUARD™, a thermal
foldback function that automatically reduces the charge
current when the internal die temperature exceeds a 100°C
limit to prevent further temperature rise. This function
removes the concern of thermal failure in the targeted
space-limited applications. An ambient temperature
monitoring circuit allows users to set two separate
temperature limit levels, for charge and non-charge
conditions. The thermally-enhanced QFN package further
improves the thermal performance of the ISL6297 in space-
limited applications.
Pinout
ISL6297
16 LD QFN
TOP VIEW
16 15 14 13
VIN 1
GRN 2
RED 3
TIME 4
12 VSEN
11 TEMP
10 IMIN
9 IREF
5678
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Very Low Thermal Dual-Mode Operation
• 0.7% Voltage Accuracy with Remote Sense
• Pre-charge circuit verification with LED status indication
• Drives a bi-color LED
• Programmable Safety Timer
• Programmable Current Limit up to 1.5A
• Programmable End-of-Charge Current
• THERMAGUARD™ Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Two-Level Ambient Temperature Setting
• Guaranteed to Operate at 2.65V After Start-Up
• Ambient Temperature Range: -20°C to 70°C
• Thermally-Enhanced QFN Packages
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Medical Handhelds
• Self-Charging Battery Packs
• Stand-Alone Chargers
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6297CR ISL6297CR -20 to 70 16 Ld 4x4 QFN L16.4x4
ISL6297CR-T ISL6297CR 16 Ld 4x4 QFN Tape and Reel
ISL6297CRZ 6297CRZ
(See Note)
-20 to 70 16 Ld 4x4 QFN L16.4x4
(Pb-free)
ISL6297CRZ-T 6297CRZ 16 Ld 4x4 QFN Tape and Reel
(See Note)
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate termination finish,
which are RoHS compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Thermaguard is a trademark of Intersi Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
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