SC4503TSKTRT Semtech, SC4503TSKTRT Datasheet - Page 19

• Manufacturer Part Number: SC4503TSKTRT
• Description: IC SW REG STEP-UP 1.4A TSOT23-5
• Manufacturer: Semtech
• Type: Step-Up (Boost), Sepicr

Specifications of SC4503TSKTRT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 27V
• Current - Output: 1.4A
• Frequency - Switching: 1.3MHz
• Voltage - Input: 2.5 ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: SC4503TSKTR

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