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SC4539ULTRT Datasheet

  • SC4539ULTRT

  • High Effi ciency Boost Converter for up to 6 LEDS

  • 14頁

  • SEMTECH   SEMTECH

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SC4539
High Efficiency Boost Converter
for up to 6 LEDS
POWER MANAGEMENT
Features
Input voltage range 鈥?2.8V to 5.5V
Current-mode PWM control 鈥?800kHz
Programmable LED current up to 30mA
Soft-start to reduce in-rush current
PWM dimming 鈥?100Hz to 50kHz
PWM dimming at ISET 鈥?Analog and filtered
Over-voltage protection 鈥?25V (max.)
Under-voltage lockout (UVLO)
Thermal shutdown
Shutdown current 鈥?<1渭A
Ultra-thin package 鈥?2mm x 2mm x 0.6mm
Lead-free package, WEEE and RoHS compliant
Description
The SC4539 is designed to regulate current for a series
chain of white LEDs in LCD backlighting applications
where small size and high efficiency are priorities. This
device integrates an 800kHz current-mode PWM boost
converter and a 30mA programmable low dropout current
sink regulator.
An external resistor sets the LED current up to 30mA.
PWM dimming (100Hz to 50kHz) may be applied directly
to the enable (EN) pin, or dimming can be controlled by
applying an analog signal to the ISET circuit. The boost
circuit can output up to 22V (guaranteed) to drive up to 6
LEDs in series. The current regulator protects against
shorts between the BL and OUT pins and also eliminates
backlight glow during shutdown when using LEDs with
high leakage. Under-voltage lockout and thermal shut-
down provide additional protection. A small external
capacitor and series resistor control soft-start and loop
compensation. Over-voltage detection protects the
SC4539 if the LED pin is floating or shorted to ground.
The SC4539 is available in an MLPD-8 pin 2mm x 2mm x
0.6mm package, with a rated temperature range of -40擄C
to +85擄C.
Applications
White LED Display Backlight Driver
Smartphones and PDAs
Cellular Handsets
MP3 and Portable Media Players
DSC, GPS, Satellite Radio, Game Players
Typical Application Circuit
D
L1
LX
IN
C
IN
OUT
C
OUT
2.8 to
5.5V
SC4539
Enable and
PWM dimming
R
ISET
C
COMP
ISET
EN
R
COMP
COMP
GND
BL
September 5, 2007
1

SC4539ULTRT 產(chǎn)品屬性

  • 3,000

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動器

  • -

  • 是

  • -

  • 1

  • 是

  • 背光

  • 白色 LED

  • 680kHz ~ 920kHz

  • 2.8 V ~ 5.5 V

  • 5 V ~ 22 V

  • 表面貼裝

  • 8-UFQFN 裸露焊盤

  • 8-UMLP

  • 帶卷 (TR)

  • -40°C ~ 85°C

  • SC4539ULTRT-NDSC4539ULTRTTR

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