Global Mixed-mode Technology Inc.
G5114/G5116/G5118
High Efficiency, Constant Current Output for 8 Se-
ries LEDs Driver
Features
Driving Up to 8 LEDs
Auto Trigger/Release OVP Function
(G5114/G5118)
Input Voltage Range: 1.7V ~ 6.5V
Precise Dimming Control Using PWM Signal
50µA No Switching Current
Internal 30V Switch With 0.8Ω Rds(on)
Soft Start Function Included
Up to 85% Efficiency
General Description
The G5114/G5116/G5118 are high efficiency boost
converters with constant current output that drives up to
8 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
G5114T1U
G5116T1U
G5118P8U
ORDER NUMBER
(Pb free)
G5114T1Uf
G5116T1Uf
G5118P8Uf
MARKING
5114X
5116X
G5118
TEMP.
RANGE
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
PACKAGE
SOT-23-5
SOT-23-5
MSOP-8
Pin Configuration
Typical Application Circuit
SW
1
5 VCC
GND 2
FB 3
G5114
4 OVP
SOT-23-5
V
IN
2.7V to 4.2V
V
IN
L1
D1
V
OUT
SW
OVP
C2
1µF/ 35V
8 LEDs
SW 1
GND 2
FB 3
SOT-23-5
5 VCC
4.7µF/ 6.3V
C1
G5116
PWM Dimming
Waveform
G5118
SHDN
GND
FB
R
S
4 SHDN
VCC 1
PGND 2
8 SW
7 AGND
G5118
N.C. 3
OVP 4
MSOP-8L
6 FB
5 SHDN
Ver: 1.1
Sep 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
SW, OVP to GND……….……..…….…..….-0.3V to +35V
VCC,
SHDN
to GND.….......................…...-0.3V to +7V
FB to GND.....................….......................…-0.3V to VCC
Operating Temperature.….……………...…-40°C to 85°C
G5114/G5116/G5118
Junction Temperature.......................…...................125°C
Storage Temperature………....……....…..–65°C to 150°C
Reflow Temperature (soldering, 10sec)……….....260°C
Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device.
Electrical Characteristics
(V
CC
=V
SHDN
=3.6V, T
A
=25°C, unless specified)
PARAMETER
Input Voltage Range
OV Protection Threshold
OV Pin Input Current
Quiescent Current
FB Comparator Trip Point
Switch Off Time
Switch R
DS(ON)
Switch Leakage Current
Switch Current Limit
V
FB
= 0V
I
SW
= 150mA
Switch Off, V
SW
= 30V
G5114/G5118, Trigger
G5114/G5118, Release
G5114/G5118, V
ovp
= 28V
V
FB
= 0.3V
V
SHDN
= 0V
CONDITION
MIN
1.7
28
---
---
---
---
242
---
---
---
320
0.9
---
TYP
---
29
---
10
50
2.4
250
400
0.8
0.1
400
---
---
MAX
6.5
30
25
15
100
3
258
---
1.2
5
480
---
0.25
UNIT
V
V
V
µA
µA
µA
mV
ns
Ω
µA
mA
V
V
SHDN
Pin Voltage High
SHDN
Pin Voltage Low
Note.1:The G5114/G5116/G5118 are guaranteed to meet performance specifications from 0°C~85°C. Specifications
over the -40°C~85°C operating temperature range are assured by design, characterization and correlation
with statistical process controls.
Block Diagram
L1
V
IN
C1
VCC
SHDN
C2
D1
V
OUT
*
SW
OVP
**
BIAS
V
OUT
LED
Series
FB
R2
+
SHUTDOWN
LOGIC
PUMP CONTROL
OC
DRIVER
COMP
en_sw
+
T
OFF
PULSE
CONTROL
CTRL
ERROR
COMP
0.25V
VREF
GND
*
SHDN pin only availiable for G5116/G5118
**
OVP pin only availiable for G5114/G5118
Ver: 1.1
Sep 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(V
CC
= +3.6V, V
SHDN
= +3.6V, L=10µH, T
A
=25°C, unless otherwise noted)
G5114/G5116/G5118
Efficiency vs. Output Current
90
85
90
Efficiency vs. Input Voltage
85
V
IN
=4.2V
Efficiency (%)
I
O
=20mA
Efficiency (%)
80
75
70
65
60
0
5
10
V
IN
-3.6V
V
IN
=2.7V
80
75
70
65
60
6LEDs, C
O
=1µF
15
20
25
6LEDs, C
O
=1µF
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Load Current (mA)
Input Voltage (V)
SW RDS_on vs. Input Voltage
1.5
1.25
1.5
1.25
SW RDS_on vs. Temperature
SW RDS_on (
Ω
)
1
0.75
0.5
0.25
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
SW RDS_on (
Ω
)
1
0.75
0.5
0.25
0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
Current Limit vs. Input Voltage
500
400
300
200
100
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
600
500
Current Limit vs. Temperature
Current Limit (mA)
Current Limit (mA)
400
300
200
100
0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
Ver: 1.1
Sep 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(Continued)
OVP Trigger Threshold vs. Input Voltage
31
G5114/G5116/G5118
OVP Trigger Threshold vs. Temperature
35
OVP Trigger Threshold (V)
OVP Trigger Threshold (V)
34
33
32
31
30
29
28
27
26
25
-40
-20
0
20
40
60
80
100
30
29
28
27
26
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
Input Voltage (V)
Temperature (°C)
OVP Release Threshold vs. Input Voltage
24
OVP Release Threshold vs. Temperature
30
OVP Release Threshold (V)
OVP Release Threshold (V)
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
29
28
27
26
25
24
23
22
21
20
-40
-20
0
20
40
60
80
100
23.5
23
22.5
22
Input Voltage (V)
Temperature (°C)
LED Current vs. Input Voltage
30
25
25
LED Current vs. Duty Cycle
6LEDs
6LEDs
C
O
=0.1µF
20
LED Current (mA)
20
15
10
5
0
1.5
2
2.5
3
3.5
4
C
O
=1µF
LED Current (mA)
C
O
=0.1µF
15
10
C
O
=1µF
5
0
4.5
5
5.5
6
6.5
0
10
20
30
40
50
60
70
80
90 100
Input Voltage (V)
Duty Cycle (%)
Ver: 1.1
Sep 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(Continued)
Efficiency vs. Output Current
90
85
G5114/G5116/G5118
PWM Dimming
V
IN
=4.2V
Efficiency (%)
80
75
70
65
60
0
5
10
15
20
25
V
IN
=3.0V
V
IN
=3.6V
8LEDs, C
O
=1µF
Load Current (mA)
OVP Waveform
G5118 Inrush Current Waveform
Ver: 1.1
Sep 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
京公网安备 11010802033920号
EEWORLD
