Global Mixed-mode Technology Inc.
G5105
Low-Noise Step-up DC-DC Converter
Features
90% Efficiency
Adjustable Output from V
IN
to 20V
0.8A, 0.6Ω, 24V Power MOSFET
2.5V to 5.5V Input Range
Fast 1MHz Switching Frequency
SOT-23-6 and TSOT-23-6 Package
General Description
The G5105 boost converter in corporate high-per-
formance, voltage-mode, fixed-frequency (at 1MHz),
pulse width modulation (PWM) circuitry with a built-in
0.6Ω n-channel MOSFET to provide a highly efficient
regulator.
High switching frequency allows easy filtering and
faster loop performance. An external compensation
pin provides the user flexibility in determining loop dy-
namics, allowing the use of small, low ESR ceramic
output capacitors. The device can produce an output
voltage as high as 20V.
The G5105 is available in a space-saving SOT-23-6
and TSOT-23-6 package.
Applications
Small/Medium Size LCD Displays
Organic LED Bias
Portable Applications
Hand-Held Devices
Ordering Information
ORDER
NUMBER
G5105TBU
G5105TPU
MARKING
5105xx
5105x
TEMP.
RANGE
-40°C ~ +85°C
-40°C ~ +85°C
PACKAGE
(Pb free)
SOT-23-6
TSOT-23-6
Note:TB : SOT-23-6 TP: TSOT-23-6
U: Tape & Reel
Pin Configuration
Typical Application Circuit
G5105
SW
1
6
VCC
V
IN
2.5V to 5.5V
VCC
L1
4.7µH
SW
FB
COMP
D1
V
OUT
15V, 40mA
R1
560k
C
F
47pF
SHDN
GND
2
5 COMP
C1
10µF
GND
R
C
3.6kΩ
R2
51kΩ
C2
10µF
FB
3
SOT-23-6/TSOT-23-6
4 SHDN
C
C
10nF
Ver: 0.6 Preliminary
May 10, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
VCC,
SHDN
to GND. . . . . . . . . . . . . . . . .-0.3V to +7V
FB, COMP to GND . . . . . . . . . . . . . . . . . . -0.3V to VCC
SW to GND . . . . . . . . . . . . . . . . . . . . .. . .-0.3V to +24V
Operating Temperature . . . . . . . . . . . . . .-40°C to 85°C
G5105
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)
PARAMETER
Input Voltage Range
Input Voltage UVLO
V
FB
= 1.5V (no switching)
Quiescent Current
V
FB
= 0V (switching)
V
SHDN
= 0V
Initial Accuracy
Temperature Coefficient
CONDITIONS
MIN
2.5
1.7
---
---
---
1.25
---
---
---
---
TYP
---
2.0
100
---
0.1
1.28
100
0.76
100
5
1
---
0.6
0.1
0.95
---
---
MAX
5.5
2.3
200
2
1
1.31
---
---
---
10
1.3
---
1
10
1.3
---
0.8
UNITS
V
V
µA
mA
µA
V
ppm/°C
mmho
V/V
%
MHz
%
Ω
µA
A
V
V
FB Comparator Trip Point
Error Amp Transconductance
Error Amp Voltage Gain
Output Over Voltage Protection
Switching Frequency
Maximum Duty
Switch R
DS(ON)
Switch Leakage Current
Switch Current Limit
SHDN
Pin Voltage High
SHDN
Pin Voltage Low
V
FB
= 0.2V
I
SW
= 150mA
V
SW
= 20V
0.7
85
---
---
0.7
2
---
Ver: 0.6 Preliminary
May 10, 2006
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.)
IQ_SW vs. Input Voltage
1.2
1
0.8
0.6
0.4
0.2
0
2
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
1.2
1
0.8
0.6
0.4
0.2
0
-40
G5105
IQ_SW vs. Temperature
IQ_SW (mA)
IQ_SW (mA)
-20
0
20
40
60
80
100
Temperature (
°
C)
IQ_NOSW vs. Input Voltage
140
120
100
IQ_NOSW (
µ
A)
80
60
40
20
0
2
2.5
3
3.5
4
4.5
5
5.5
6
IQ_NOSW (
µ
A)
IQ_NOSW vs. Temperature
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (
°
C)
IQ_SHDN vs. Input Voltage
0.5
0.4
0.3
IQ_SHDN (
µ
A)
IQ_SHDN vs. Temperature
0.5
0.4
0.3
0.2
IQ_SHDN (
µ
A)
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
2
2.5
3
3.5
4
4.5
Input Voltage (V)
5
5.5
6
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-40
-20
0
20
40
60
80
100
Temperature (
°
C)
Ver: 0.6 Preliminary
May 10, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
Feedback Voltage vs. Input Voltage
1.31
1.3
Feedback Voltage (mV)
G5105
Feedback Voltage vs. Temperature
1.31
1.3
Feedback Voltage (mV)
1.29
1.28
1.27
1.26
1.25
2
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
1.29
1.28
1.27
1.26
1.25
-40
-20
0
20
40
60
80
100
Temperature (
°
C)
Frequency vs. Input Voltage
1.2
1.1
1
0.9
Frequency (MHz)
Frequency vs. Temperature
1.2
1.1
1
0.9
Frequency (MHz)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0
20
40
60
80
100
Temperature (
°
C)
SW R_on vs. Input Voltage
1
0.9
0.8
0.7
SW R_on (Ω)
SW R_on (Ω)
SW R_on vs. Temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
0.6
0.5
0.4
0.3
0.2
0.1
0
2
2.5
3
3.5
4
4.5
Input Voltage (V)
5
5.5
6
-20
0
20
40
60
Temperature (
°
C)
80
100
Ver: 0.6 Preliminary
May 10, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
Current Limit vs. Input Voltage
1000
950
900
Current Limit (mA)
Current Limit (mA)
G5105
Current Limit vs. Temperature
1000
950
900
850
800
750
700
650
600
-40
850
800
750
700
650
600
2
2.5
3
3.5
4
4.5
Input Voltage (V)
5
5.5
6
-20
0
20
40
60
Temperature (
°
C)
80
100
Stability Waveform
Stability Waveform
Stability Waveform
Stability Waveform
Ver: 0.6 Preliminary
May 10, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
5
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