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SC4503 Datasheet(PDF) 19 Page - Semtech Corporation

Part # SC4503
Description  1.3MHz Step-Up Switching Regulator with 1.4A Switch
PDF  22 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4503 Datasheet(HTML) 19 Page - Semtech Corporation

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19
 2007 Semtech Corp.
www.semtech.com
SC4503
POWER MANAGEMENT
Typical Application Circuits
3.3V
26V (10mA)
C1
4.7
µF
OUT1
10BQ015
D1
4.7
µF X 2
R1
C2
R2
49.9k
309k
9V (0.3A)
C9
0.1
µF
D6
D7
C10
1
µF
D2
0.1
µF
C5
D3
0.1
µF
C6
D4
0.1
µF
C7
D5
1
µF
C8
OUT2
OUT3
-8.5V (10mA)
L1
C3
56nF
4.7
µH
17.8k
R3
SC4503
3
1
5
2
GND
SHDN/SS
IN
SW
FB
4
3.3V
< 0.4V
ON
OFF
C4
12pF
RUN
D2 - D7 : BAT54S
L1 : Sumida CDC5D23B-4R7M
C2: Murata GRM21BR61C475K
C1: Murata GRM188R61A105K
Figure 13(a). Triple-Output TFT Power Supply with Soft-Start
CH3
CH2
CH1
CH4
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 20V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : RUN Voltage, 5V/div
400
µs/div
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
Lower Trace : Inductor Current, 0.5A/div
40
µs/div
TFT Power Supply Start-up Transient as
the RUN Voltage is Stepped from 0 to
3.3V
Figure 13(b).
Load Transient Response. I
OUT1
is switched between 50mA and
350mA
Figure 13(c).



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