Global Mixed-mode Technology Inc.
G5115/G5117/G5119
High Efficiency, Constant Current Output for 4 Se-
ries LEDs Driver
Features
Driving Up to 4 LEDs
Auto Trigger/Release OVP Function
(G5115/G5119)
Input Voltage Range: 1.7V ~ 6.5V
Precise Dimming Control Using PWM Signal
50µA No Switching Current
Internal 18V Switch With 0.8Ω Rds(on)
Soft Start Function Included
Up to 85% Efficiency
General Description
The G5115/G5117/G5119 are high efficiency boost
converters with constant current output that drives up to
4 white LEDs. The continuous LED current is set with
the FB pin regulated voltage across an external sense
resistor (Rs) connected from that pin to ground. A dim-
ming PWM waveform to
SHDN
pin controls LED av-
erage current proportional to its duty makes the bright-
ness of LEDs also proportional to the duty.
Low FB regulation voltage and low switch turned on
resistance result in high converting efficiency from wide
battery voltage range to high LED series voltage.
An over-voltage protection prevents device damage
while LEDs is open. It is easy to release protection
state by just put the load path closed.
Applications
White LED Backlight Display for PDA
Pocket PC
Smart Phones
Handheld Devices
Cellular Phones
Ordering Information
ORDER NUMBER
G5115T1U
G5117T1U
G5119P8U
Note:T1 : SOT-23-5
U : Tape & Ree
l
ORDER NUMBER
(Pb free)
G5115T1Uf
G5117T1Uf
G5119P8Uf
P8 : MSOP-8L
MARKING
5115X
5117X
G5119
TEMP. RANGE
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
PACKAGE
SOT-23-5
SOT-23-5
MSOP-8L
Pin Configuration
SW
1
5 VCC
Typical Application Circuit
GND 2
FB 3
G5115
4 OVP
SOT-23-5
V
IN
2.7V to 4.2V
L1
D1
V
OUT
V
IN
4.7µF/ 6.3V
C1
SW
OVP
C2
1µF/ 25V
4 LEDs
SW 1
GND 2
FB 3
SOT-23-5
VCC 1
PGND 2
5 VCC
G5117
4 SHDN
G5119
PWM Dimming
Waveform
SHDN
GND
FB
R
S
8 SW
7 AGND
G5119
N.C. 3
OVP 4
MSOP-8
6 FB
5 SHDN
Ver: 1.1
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
