SC4503TSKTRT Semtech, SC4503TSKTRT Datasheet - Page 18

• 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 12(b). Effi ciency vs Load Current
85
80
75
70
65
60
55
50
45
40
35
30
0.001
V
OUT
2.6 - 4.2V
Efficiency vs Load Current
= 3.3V
0.010
1-CELL
LI-ION
Load Current (A)
Figure 12(a). Single Li-ion Cell to 3.3V SEPIC Converter.
1µF
C1
0.100
V
V
V
R3
8.06k
IN
IN
IN
C3
0.22µF
= 2.6V
= 3.6V
= 4.2V
L1 and L2: Coiltronics DRQ73-3R3
C1: Murata GRM188R61A105K
C2: Murata GRM21BR60J106K
C5: Murata GRM188R61A225K
4
1.000
SHDN/SS
IN
5
SC4503
3.3µH
GND
L1
2
1
SW
FB
18
3
2.2µF
C5
Figure 12(c).
Upper Trace : Output Voltage, AC Coupled, 0.2V/div
Lower Trace : Input Inductor Current, 0.2A/div
L2
3.3µH
10BQ015
D1
Load Transient Response of the Circuit
in Figure 12(a). I
100mA and 500mA
C4
15pF
40µs/div
R1
412k
R2
249k
3.3V, 0.45A
VOUT
C2
10µF
OUT
V
is switched between
IN
= 3.6V
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SC4503