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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 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 288K |
| 代理商： | G5103T11UF |
Ver: 1.1
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G5103
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
FUNCTION
1
SW
Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor.
2
GND
Ground.
3
FB
Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram):
R1 = R2
2
.
1
VOUT
-1
4
SHDN
Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low to turn this
device off.
5
VCC
Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
Function Description
The G5103 is a boost converter with a NMOS
switch embedded (refer to Block Diagram). The
boost cycle is getting started when FB pin voltage
drop below 1.2V as the NMOS switch turns on.
During the switch on period, the inductor current
ramps up until 350mA current limit is reached. Then
turns the switch off, while the inductor current flows
through external schottky diode, and ramps down to
zero. During the switch off period, the inductor cur-
rent charges output capacitor and the output volt-
age is boosted up. This pumping mechanism con-
tinues cycle by cycle until the FB pin voltage ex-
ceed 1.2V and entering the none switching mode.
In this mode, the G5103 consumes as low as 20uA
typically to save battery power.
Applications Information
Choosing an Inductor
There are several recommended inductors that work
well with the G5103 in Table 1. Use the equations and
recommendations in the next few sections to find the
proper inductance value for your design.
Table 1. Recommended Inductors
PART
VALUE
(H) MAX DCR ()
VENDOR
LQH3C4R7
LQH3C100
LQH3C220
4.7
10
22
0.26
0.30
0.92
Murata
www.murata.com
CD43-4R7
CD43-100
CDRH4D18-4R
7
CDRH4D18-100
4.7
10
4.7
10
0.11
0.18
0.16
0.20
Sumida
www.sumida.com
DO1608-472
DO1608-103
DO1608-223
4.7
10
22
0.09
0.16
0.37
Coilcraft
www.coilcraft.com
Inductor Selection—Boost Regulator
The appropriate inductance value for the boost regu-
lator application may be calculated from the following
equation. Select a standard inductor close to this
value.
VOUT-VIN(MIN)+VD
L =
ILIM
x tOFF
Where VD = 0.4V (Schottky diode voltage), ILIM =
350mA and tOFF = 500ns. A larger value can be used
to lightly increase the available output current, but limit
it to about twice the calculating value. When too large
of an inductor will increase the output voltage ripple
without providing much additional output current. In
varying VIN condition such as battery power applica-
tions, use the minimum VIN value in the above equa-
tion. A smaller value can be used to give smaller
physical size, but the inductor current overshoot will be
occurs (see Current Limit Overshoot section).
Inductor Selection—SEPIC Regulator
For a SEPIC regulator using the G5103, the approxi-
mate inductance value can be calculated by below
formula. As for the boost inductor selection, a larger or
smaller value can be used.
VOUT + VD
L = 2
ILIM
x tOFF
Current Limit Overshoot
The G5103 use a constant off-time control scheme,
the power switch is turned off after the 350mA current
limit is reached. When the current limit is reached and
when the switch actually turns off, there is a 100ns
delay time. During this time, the inductor current ex-
ceeds the current limit by a small amount. The formula
below can calculate the peak inductor current.
VIN(MAX) - VSAT
IPEAK = ILIM +
L
x 100ns
Where VSAT = 0.25V (switch saturation voltage). When
the systems with high input voltages and uses smaller
inductance value, the current overshoot will be most
apparent. This overshoot can be useful as it helps in-
crease the amount of available output current. To use
small inductance value for systems design, the current
limit overshoot can be quite high. Even if it is internally
current limited to 350mA, the power switch of the
G5103 can operate larger currents without any prob-
lem, but the total efficiency will suffer. The IPEAK is keep
below 500mA for the G5103 will be obtained best per-
formance.
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