ISL97634_08 Datasheet, PDF (1/10 Pages) Intersil Corporation – White LED Driver with Wide PWM Dimming Range

®
Data Sheet
March 7, 2008
ISL97634
FN6264.3
White LED Driver with Wide PWM
Dimming Range
The ISL97634 represents an efficient and highly integrated
PWM boost LED driver that is suitable for 1.8” to 3.5” LCDs
that employ 2 to 7 white LEDs for backlighting. With
integrated Schottky diode, OVP, and wide range of PWM
dimming capability, the ISL97634 provides a simple, reliable,
and flexible solution to the backlight designers.
The ISL97634 features a wide range of PWM dimming
control capability. It allows dimming frequency as low as DC
to 32kHz beyond audible spectrum. The ISL97634 also
features a feedback disconnect switch to prevent the output
from being modulated by the PWM dimming signal that
minimizes system disturbance.
The ISL97634 is available in the 8 Ld TDFN (2mmx3mm)
package. There are 14V, 18V, and 26V OVP options that are
suitable for 3 LEDS, 4 LEDs, and 7 LEDs (3.5V/20mA type)
backlight applications respectively. The ISL97634 is
specified for operation over the -40°C to +85°C ambient
temperature at input voltage from 2.4V to 5.5V.
Pinout
ISL97634
(8 LD TDFN)
TOP VIEW
GND ₁
VIN 2
PWM/EN 3
NC 4
8 ^LX
7 VOUT
6 FBSW
5 FB
Typical Application Circuit
10µH or 22µH
VIN
VIN
PWM/EN
NC
GND
LX
VOUT
FBSW
FB
Features
• Drives Up to 7 LEDs in Series (3.5V/20mA type)
• OVP (14V, 18V, and 26V for 3, 4 and 7 LEDs Applications)
• PWM Dimming Control From DC to 32kHz
• Output Disconnect Switch
• Integrated Schottky Diode
• 2.4V to 5.5V Input
• 85% Efficiency
• 1.4MHz Switching Frequency Allows Small LC
• 1µA Shutdown Current
• Internally Compensated
• 8 Ld TDFN (2mmx3mm)
• Pb-Free (RoHS Compliant)
Applications
• LED Backlighting for:
- Cell phones
- Smartphones
- MP3
- PMP
- Automotive Navigation Panel
- Portable GPS
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-free)
Tape & Reel
PKG.
DWG.
#
ISL97634IRT14Z-T ELE
8 Ld 2x3 TDFN L8.2x3A
ISL97634IRT14Z-TK ELE
8 Ld 2x3 TDFN L8.2x3A
ISL97634IRT18Z-T ELF
8 Ld 2x3 TDFN L8.2x3A
ISL97634IRT18Z-TK ELF
8 Ld 2x3 TDFN L8.2x3A
ISL97634IRT26Z-T ELG
8 Ld 2x3 TDFN L8.2x3A
ISL97634IRT26Z-TK ELG
8 Ld 2x3 TDFN L8.2x3A
*Please refer to TB347 for details on reel specifications
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is 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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