G5994 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 4-Channels HB-LED Driver with High Voltage DC-DC Controller

Global Mixed-mode Technology Inc.
G5994
4-Channels HB-LED Driver with High Voltage
DC-DC Controller
Features
„ 4 Channels
„ Drive 20mA to 150mA Each Channel
„ 100Hz to 25kHz Dimming Frequency
„ Current Mode Boost Controller
„ 10V to 30V Input Supply
„ 50kHz to 2MHz Programmable Switching
Frequency
„ External Switching Frequency Synchronization
„ Current Matching 2%
„ Highest Vf String Detection for Regulation
„ Protections:
Š Open LED Protection (OLP)
Š Short LED Protection (SLP)
Š Switch Over Current Protection (OCP)
Š Output Over Voltage Protection (OVP)
Š Over Temperature Protection (OTP)
„ TSSOP-20 (FD) Package
„ RoHS Compliant
Applications
„ LCD TV LED Backlighting
„ LCD Monitor LED Backlighting
General Description
The G5994 is an integrated HB-LED backlight driver
that controls 4 channels of LED current for LCD back-
light applications such as LCD TV and LCD monitor.
The G5994 is capable for driving 20mA to 150mA
white LEDs. The G5994’s 4 channels of voltage con-
trolled current sinks with 2% current matching com-
pensate for the non-uniformity effect of forward voltage
variance in the LED stacks. To minimize the voltage
headroom and power loss in the typical multi-strings
operation, the G5994 monitors the total highest LED
forward voltage string and uses its feedback signal for
output regulation.
A SETI pin is used for programming maximum LED
current. A high contrast ratio true PWM dimming can
be achieved by driving DIM pin with a PWM signal.
LED current is proportional to the DIM pin duty.
The G5994 features extensive protection functions
that include OLP, SLP, OCP, OVP and OTP. It is
available in a TSSOP-20 (FD) package.
Ordering Information
ORDER
NUMBER
G5994F21U
Note: F2: TSSOP-20 (FD)
1: Bonding Code
U:Tape & Reel
Pin Configuration
MARKING
G5994
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TSSOP-20 (FD)
NDRV 1
DRV 2
VCC 3
IN 4
EN 5
COMP 6
RT 7
FLT 8
OVP 9
SETI 10
G5994
Thermal
Pad
Top View
TSSOP-20 (FD)
20 PGND
19 CS
18 OUT4
17 OUT3
16 LEDGND
15 OUT2
14 OUT1
13 DIM
12 SGND
11 RSDT
Ver: 0.1
Mar 03, 2011
TEL: [phone]
http://www.gmt.com.tw
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