ISL9212B Datasheet, PDF (1/11 Pages) Intersil Corporation – Charging System Safety Circuit

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Data Sheet
March 21, 2007
ISL9212B
FN6399.0
Charging System Safety Circuit
The ISL9212B is an integrated circuit (IC) optimized to
provide a Li-ion battery redundant safety protection from
failures of a charging system. The IC monitors the input
voltage, the battery voltage, and the charge current. When
any of the three parameters exceeds its limit, the IC turns off
an internal P-Channel MOSFET to remove the power from
the charging system. In addition to the above protected
parameters, the IC also monitors its own internal
temperature and turns off the P-Channel MOSFET when the
die temperature exceeds +140°C. Together with the battery
charger IC and the protection module in a battery pack, the
charging system using the ISL9212B has triple-level
protection and is two-fault tolerant.
The IC is designed to turn on the internal PFET slowly to
avoid inrush current at power-up but will turn off the PFET
quickly when input overvoltage is detected in order to
remove the power before any damage occurs. The
ISL9212B has a logic warning output to indicate the fault and
an enable input to allow the system to remove the input
power.
Ordering Information
PART
NUMBER
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
PKG.
DWG. #
ISL9212BIRZ* _2BZ
(Note)
-40 to +85 12 Ld 4x3 TDFN L12.4x3A
(Pb-free)
ISL9212EVAL1 ISL9212B Evaluation Board
*Add “-T” suffix for tape and reel.
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.
Typical Application Circuit
INPUT
VIN
C₁
OUT
ISL6292
BATTERY
CHARGER
R_ILIM
ISL9212B
ILIM
VB
EN
GND
WRN
R_VB
+
BATTERY
PACK
Features
• Fully Integrated Protection Circuit for Three Protection
Variables
- User Programmable Overcurrent Protection Threshold
- Input Overvoltage Protection in Less Than 1µs
- Battery Overvoltage Protection
• High Immunity of False Triggering Under Transients
• High Accuracy Protection Thresholds
• Warning Output to Indicate the Occurrence of Faults
• Enable Input
• Thermal Enhanced DFN Package
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Cell Phones
• Digital Still Cameras
• PDAs and Smart Phones
• Portable Instruments
• Desktop Chargers
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pinout
ISL9212B
(12 LD 4x3 TDFN)
TOP VIEW
VIN 1
VIN 2
GND 3
WRN 4
NC 5
NC 6
EPAD
12 NC
11 OUT
10 OUT
9 ILIM
8 VB
7 EN
NOTE: EPAD must be electrically connected to the GND pin.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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