ISL97632_07 Datasheet, PDF (1/9 Pages) Intersil Corporation – White LED Driver with Digital Dimming

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Data Sheet
April 10, 2007
ISL97632
FN9239.2
White LED Driver with Digital Dimming
The ISL97632 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 dynamic digital
dimming capability, the ISL97632 provides a simple, reliable,
and flexible solution to the backlight designers.
The ISL97632 features a simple single-wire digital interface
that provides a 5-bit dimming control. The dimming signal
adjusts the FB voltage and therefore the LED brightness in a
DC manner in 32 linear steps. An EN pin can be used to
provide a zero brightness setting or shutdown power saving
function.
The ISL97632 is available in the 8 Ld DFN (2mmx3mm)
package. There are 14V, 18V, and 26V OVP options that are
suitable for 3, 4, and 6 LEDs backlight applications
respectively. The ISL97632 is specified for operation over
the -40°C to +85°C ambient temperature at input voltage
from 2.4V to 5.5V.
Pinout
ISL97632
(8 LD 2x3 TDFN)
TOP VIEW
GND ₁
VIN 2
EN 3
SDIN 4
8 ^LX
7 VOUT
6 FBSW
5 FB
Typical Application Circuit
10µH or 22µH
VIN
VIN
EN
SDIN
GND
LX
VOUT
FBSW
FB
Features
• 5-Bit Digital Dimming Control
• Drives up to 6 LEDs in Series
• OVP (14V, 18V and 26V for 3, 4, and 6 LEDs applications)
• Integrated Schottky Diode
• 2.4V to 5.5V input
• 86% Efficiency
• 1.4MHz Switching Frequency Allows Small LC
• Enable for Shutdown Function or Zero Brightness Setting
• 1µA Shutdown Current
• Internally Compensated
• 8 Ld DFN (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.#
ISL97632IRT14Z-T ELB
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97632IRT14Z-TK ELB
13” 8 Ld 2x3 TDFN L8.2x3A
(1k pcs.)
ISL97632IRT18Z-T ELC
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97632IRT18Z-TK ELC
13” 8 Ld 2x3 TDFN L8.2x3A
(1k pcs.)
ISL97632IRT26Z-T ELD
13” 8 Ld 2x3 TDFN L8.2x3A
(6k pcs.)
ISL97632IRT26Z-TK ELD
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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