ISL97634 Datasheet, PDF (1/10 Pages) Intersil Corporation – White LED Driver with Wide PWM Dimming Range

®
Data Sheet
April 10, 2007
ISL97634
FN6264.2
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 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.
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 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.
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 6 LEDs in Series
• 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
• 85% Efficiency
• 1.4MHz Switching Frequency Allows Small LC
• 1µA Shutdown Current
• Internally Compensated
• 8 Ld TDFN (2mmx3mm)
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• LED Backlighting for:
- Cell phones
- Smartphones
- MP3
- PMP
- Automotive Navigation Panel
- Portable GPS
Ordering Information
PART
NUMBER
(Note)
TAPE &
PART REEL
MARKING (QTY)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL97634IRT14Z-T ELE
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97634IRT14Z-TK ELE
13” 8 Ld 2x3 TDFN L8.2x3A
(1k pcs.)
ISL97634IRT18Z-T ELF
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97634IRT18Z-TK ELF
13” 8 Ld 2x3 TDFN L8.2x3A
(1k pcs.)
ISL97634IRT26Z-T ELG
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97634IRT26Z-TK ELG
13” 8 Ld 2x3 TDFN L8.2x3A
(1k pcs.)
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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