G5968B Datasheet, PDF (1/2 Pages) Global Mixed-mode Technology Inc – 8-Channels LED Driver

Global Mixed-mode Technology Inc.
8-Channels LED Driver
G5968B
Features
„ 8 Channels
„ 4.2V to 24V Input Supply
„ 48V Maximum Output Voltage
„ Channel Full current Programmable up to 30mA
„ Current Matching 1.5%
„ Highest Vf String Detection for Regulation
„ High Accuracy Digital Dimming by PWM Pin
„ Automatic Connect/Disconnect LED
„ 1MHz Switching Frequency
„ Power sequence free for EN,PWM and VIN
„ Protections:
Š Open LED Protection (OLP)
Š Over Current Protection (OCP)
Š Over Voltage Lockout (OVP)
Š Over Temperature Protection (OTP)
„ TQFN4X4-24 & TSSOP-20 (FD) Package
„ RoHS Compliant
Applications
„ Notebook Display LED Backlighting
„ LCD Monitor LED Backlighting
„ LCD TV LED Backlighting
„ Automotive Display Backlighting
General Description
The G5968B is an integrated power LED backlight
driver that controls 8 channels of LED current for LCD
backlight applications such as notebook computer and
LCD monitor. The G5968B is a current mode boost
converter integrated with 48V/2.5A power switch driv-
ers the LED array. The G5968B’s 8 channels of volt-
age controlled current sinks with current matching
within 1.5%, which compensate 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 G5968B moni-
tors the total highest LED forward voltage string and
uses its feedback signal for output regulation.
A SET pin is used for programming maximum LED
current. A high contrast ratio true PWM dimming can
be achieved by driving PWM pin with a PWM signal.
LED current is proportional to the PWM pin duty.
The G5968B features extensive protection functions
that include OLP, OCP, OVP and OTP. It is available
in a TQFN4X4-24 & TSSOP-20 (FD) package.
Ordering Information
ORDER
NUMBER
MARKING
G5968BR51U
5968
G5968BF21U
G5968
Note: R5: TQFN4X4-24
1: Bonding Code
U:Tape & Reel
F2: TSSOP-20 (FD)
Pin Configuration
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
TQFN4X4-24
TSSOP-20 (FD)
EN 1
NC 2
NC 3
NC 4
GND 5
PWM 6
Thermal
Pad
18 PGND
17 PGND
16 OVP
15 CH1
14 CH2
13 CH3
COMP 1
IN 2
VDC 3
EN 4
GND 5
PWM ⁶
CH8 7
CH7 8
CH6 9
CH5 10
Thermal
Pad
20 ^LX
19 LX
18 PGND
17 PGND
16 OVP
15 CH1
14 CH2
13 CH3
12 CH4
11 SET
G5968B TQFN4X4-24
G5968B TSSOP-20 (FD)
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.1
Mar 14, 2011
TEL: [phone]
http://www.gmt.com.tw
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