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參數(shù)資料
| 型號(hào)： | G5103T11UF |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Micro-power Step-Up DC/DC Converters in SOT-23-5 |
| 中文描述： | 微功率升壓型DC / DC轉(zhuǎn)換器采用SOT - 23 - 5 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 288K |
| 代理商： | G5103T11UF |
Ver: 1.1
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G5103
Global Mixed-mode Technology Inc.
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors
should be used at the output to minimize the output
ripple voltage and the peak-to-peak transient voltage.
Multilayer ceramic capacitors (MLCC) are the best
choice, as they have a very low ESR and are available
in very small packages. Their small size makes them a
good match with the G5103’s SOT-23 package. If solid
tantalum capacitors (like the AVX TPS, Sprague 593D
families) or OS-CON capacitors are used, they will
occupy more volume than a ceramic ones and the
higher ESR increases the output ripple voltage. Notice
that use a capacitor with a sufficient voltage rating.
A low ESR surface-mount ceramic capacitors also
make a good selection for the input bypass capacitor,
which should be placed as close as possible to the
G5103. A 4.7F input capacitor is sufficient for most
applications.
Diode Selection
For most G5103 applications, the high switching fre-
quency requires a high-speed rectifier Schottky diodes,
such as the MBR0520 (0.5A, 20V) with their low for-
ward voltage drop and fast switching speed, are rec-
ommended. Many different manufacturers make
equivalent parts, but make sure that the component is
rated to operate at least 0.35A. To achieve high effi-
ciency, the average current rating of the Schottky di-
odes should be greater than the peak switching cur-
rent. Choose a reverse breakdown voltage greater
than the output voltage.
Lowering Output Voltage Ripple
The G5103 supplies energy to the load in bursts by
ramping up the inductor current, then delivering that
current to the load. To use low ESR capacitors will
help minimize the output ripple voltage, but proper
selection of the inductor and the output capacitor also
plays a big role. If a larger inductance value or a
smaller capacitance value is used, the output ripple
voltage will increase because the capacitor will be
slightly overcharged each burst cycle. To reduce the
output ripple, increase the output capacitance value or
add a 10pF feed-forward capacitor in the feedback
network of the G5103 (see the circuits in the Typical
Applications section). To add this small, inexpensive
10pF capacitor will greatly reduce the output voltage
ripple.
Typical Applications
Boost Converter
SEPIC Converter
VCC
SW
SHDN
FB
GND
G5103
C2
22F
C1
4.7F
L1
4.7H
R2
120k
V
IN
2.5V to 4.2V
R1
390k
5V
50mA
D1
L1
10H
VCC
SW
SHDN
FB
GND
G5103
C2
22F
C1
4.7F
R2
270k
V
IN
2.5V to 4.2V
R1
470k
3.3V
60mA
C3
1F
L1:MURATA LQH3C4R7M24
D1:MOTOROLA MBR0520
L1,L2:MURATA LQH3C100K24
D1:MOTOROLA MBR0520
L2
10H
D1
VCC
SW
SHDN
FB
GND
G5103
C2
22F
C1
4.7F
L1
4.7H
R2
120k
V
IN
2.5V to 4.2V
R1
390k
5V
50mA
D1
L1
10H
VCC
SW
SHDN
FB
GND
G5103
C2
22F
C1
4.7F
R2
270k
V
IN
2.5V to 4.2V
R1
470k
3.3V
60mA
C3
1F
L1:MURATA LQH3C4R7M24
D1:MOTOROLA MBR0520
L1,L2:MURATA LQH3C100K24
D1:MOTOROLA MBR0520
L2
10H
D1
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