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Global Mixed-mode Technology Inc.
G5105
Low-Noise Step-up DC-DC Converter
Features
90% Efficiency Adjustable Output from VIN to 20V 0.8A, 0.6, 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-performance, voltage-mode, fixed-frequency (at 1MHz), pulse width modulation (PWM) circuitry with a built-in 0.6 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 dynamics, 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
-40C ~ +85C -40C ~ +85C
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
VIN 2.5V to 5.5V VCC
L1 4.7H SW FB COMP
D1 VOUT 15V, 40mA R1 560k CF 47pF
SHDN
GND
2
5 COMP
C1 10F
GND
RC 3.6k
R2 51k
C2 10F
FB
3 SOT-23-6/TSOT-23-6
4 SHDN
CC 10nF
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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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 . . . . . . . . . . . . . .-40C to 85C
G5105
Junction Temperature . . . . . . . . . . . . . . . . . . . . .125C Storage Temperature. . . . . . . . . . . . . . -65C to 150C Reflow Temperature (soldering, 10sec) . . . . . . 260C
Stress beyond those listed under "Absolute Maximum Rating" may cause permanent damage to the device.
Electrical Characteristics
(VCC=V SHDN =3.6V, TA=25C) PARAMETER
Input Voltage Range Input Voltage UVLO VFB = 1.5V (no switching) Quiescent Current VFB = 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 A mA A V ppm/C mmho V/V % MHz % A A V V
FB Comparator Trip Point Error Amp Transconductance Error Amp Voltage Gain Output Over Voltage Protection Switching Frequency Maximum Duty Switch RDS(ON) Switch Leakage Current Switch Current Limit
SHDN Pin Voltage High SHDN Pin Voltage Low
VFB = 0.2V ISW = 150mA VSW = 20V
0.7 85 ----0.7 2 ---
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VCC= +3.6V, V SHDN = +3.6V, L=10H, TA=25C, 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 (A) 80 60 40 20 0 2 2.5 3 3.5 4 4.5 5 5.5 6 IQ_NOSW (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 ( A)
IQ_SHDN vs. Temperature
0.5 0.4 0.3 0.2
IQ_SHDN ( 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
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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 () SW R_on ()
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
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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
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Stability Waveform
G5105
Stability Waveform
Load Transient
Load Transient
Efficiency vs. Load Current
100 90 80 Efficiency (%) 70 60 50 40 30 20 10 0 0.1 1 10 100 Load Current (mA) 1000 V OUT =7.5V V IN=2.5V V IN=3.6V V IN=5.0V Efficiency (%) 100 90 80 70 60 50 40 30 20 10 0 0.1
Efficiency vs. Load Current
V IN=3.6V
V IN=5.0V
V IN=3.0V V OUT =20V
1
10 100 Load Current (mA)
1000
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Recommended Minimum Footprint
SOT-23-6/TSOT-23-6
G5105
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5 6
G5105
NAME
SW GND FB
SHDN
FUNCTION
Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor. Ground Pin. Feedback Pin. Active Low Shutdown Pin. Compensation Pin. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
COMP VCC
Block Diagram
FB COMP SW
COMPARATOR A1 + A2 + R Q CONTROL
DRIVER M1
S
1.28V VREF RAMP GENERATOR OC
+
1MHz OSCILLATOR
VCC
SHDN
GND
White LED Driver
L1 VIN C1 VCC ON OFF SHDN SW M1 C2 D2 (Optional) D1 VOUT
G5105
GND R2 FB
COMP R3 RC CC R4 R1
VBIAS
VDIM PWM Dimming
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Function Description
Normal Operation The G5105 uses a constant frequency control scheme to provide excellent line and load regulation. Operation can be best understood by referring to the block diagram. At the start of each oscillator cycle, the SR latch is set, which turns on the power switch M1. An artificial ramp is generated to the positive terminal of the PWM comparator A2. When this voltage exceeds the level at the negative input of A2, the SR latch is reset turning off the power switch. The level at the negative input of A2 is set by the error amplifier A1, and is simply an amplified version of the difference between the feedback voltage and the reference voltage of 1.28V. In this manner, the error amplifier sets the correct peak current level (DCM) or duty (CCM) to keep the output in regulation. Over Voltage Protection Over voltage protect function is designed to prevent the output accidentally damage the load. Once the device detects over voltage (nominalx1.05) at the output, the internal NMOS switch turns off to stop power input
G5105
ciency are the major concerns for most G5105 applications. Inductor with low core losses and small DCR (cooper wire resistance) at 1MHz are good choice for G5105 applications. Capacitor Selection The small size of ceramic capacitors makes them suitable for G5105 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 10F or 22F capacitor for input and output are recommended for most applications. Smaller input/output capacitor enlarges the input/output ripple. Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for G5105 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1MHz switching frequency of the G5105. A Schottky diode rated at 1A is sufficient for most G5105 applications.
Application Information
Inductor Selection A 4.7H or 10H inductor is recommended for small ripple applications. Small form factor and high effi-
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
G5105
C L
D
E
H
e1 e
1
A2 b
A A1
SOT-23-6 (TB) Package
Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance 0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane
SYMBOL
A A1 A2 b C D E e H L 1
MIN.
1.00 0.00 0.70 0.35 0.10 2.70 1.40 ----2.60 0.37 1
DIMENSION IN MM NOM.
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 2.80 -----5
MAX.
1.30 0.10 0.90 0.50 0.25 3.10 1.80 ----3.00 ----9
MIN.
0.039 0.000 0.028 0.014 0.004 0.106 0.055 ----0.102 0.015 1
DIMENSION IN INCH NOM.
0.043 ----0.031 0.016 0.006 0.114 0.063 0.075(TYP) 0.110 ----5
MAX.
0.051 0.004 0.035 0.020 0.010 0.122 0.071 ----0.118 ----9
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
C L
G5105
D
E1 E
e e1
1
A2 y A1
A b
TSOT-23-6 (TP) Package
Note: 1. Dimension D does not include mold flash, protrusions or tate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.1mm PER end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm PER side. 2. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body.
SYMBOL
A A1 A2 b C D E E1 e e1 L y 1
MIN.
0.75 0.00 0.70 0.35 0.10 2.80 2.60 1.50
DIMENSION IN MM NOM.
--------0.75 --------2.90 2.80 1.60 0.95 BSC 1.90 BSC -------------
MAX.
0.90 0.10 0.80 0.51 0.25 3.00 3.00 1.70
MIN.
0.030 0.000 0.028 0.014 0.004 0.110 0.102 0.059
DIMENSION IN INCH NOM.
--------0.030 --------0.114 0.110 0.063 0.0374 BSC 0.0748 BSC -------------
MAX.
0.035 0.004 0.031 0.020 0.010 0.118 0.118 0.067
0.37 ----0
----0.10 8
0.015 0
----0.004 8
Taping Specification
PACKAGE
SOT-23-6 TSOT-23-6
Feed Direction SOT- 23-6 / TSOT-23-6 Package Orientation
Q'TY/REEL
3,000 ea 3,000 ea
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 0.6 Preliminary May 10, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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