ISL97634
®
Data Sheet
April 10, 2007
FN6264.2
White LED Driver with Wide PWM
Dimming Range
Features
• Drives Up to 6 LEDs in Series
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 6 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.
• OVP (14V, 18V, and 26V for 3, 4 and 6 LEDs Applications)
• PWM Dimming Control From DC to 32kHz
• Output Disconnect Switch
• Integrated Schottky Diode
• 2.4V to 5.5V Input
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.
• 85% Efficiency
• 1.4MHz Switching Frequency Allows Small LC
• 1µA Shutdown Current
• Internally Compensated
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 6 LEDs 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.
• 8 Ld TDFN (2mmx3mm)
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• LED Backlighting for:
- Cell phones
Pinout
- Smartphones
- MP3
ISL97634
(8 LD TDFN)
TOP VIEW
- PMP
- Automotive Navigation Panel
- Portable GPS
GND
LX
1
2
3
4
8
7
6
5
VIN
PWM/EN
NC
VOUT
FBSW
FB
Ordering Information
PART
NUMBER
(Note)
TAPE &
REEL
MARKING (QTY)
PART
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL97634IRT14Z-T ELE
ISL97634IRT14Z-TK ELE
ISL97634IRT18Z-T ELF
ISL97634IRT18Z-TK ELF
ISL97634IRT26Z-T ELG
ISL97634IRT26Z-TK ELG
13”
(6k pcs.)
8 Ld 2x3 TDFN L8.2x3A
8 Ld 2x3 TDFN L8.2x3A
8 Ld 2x3 TDFN L8.2x3A
8 Ld 2x3 TDFN L8.2x3A
8 Ld 2x3 TDFN L8.2x3A
8 Ld 2x3 TDFN L8.2x3A
Typical Application Circuit
13”
(1k pcs.)
10µH or 22µH
VIN
13”
(6k pcs.)
LX
VIN
13”
(1k pcs.)
PWM/EN
NC
VOUT
13”
(6k pcs.)
FBSW
FB
13”
(1k pcs.)
GND
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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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