SC121 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC121' PDF : 23 Pages View PDF
SC121
Typical Characteristics (continued)
PWM Operation
V = 3.3V, V = 1.5V, I = 50mA
OUT
IN
OUT
VOUT ripple
(10mV/div)
I
L
(100mA/div)
V
LX
(5V/div)
Time = (400ns/div)
Startup Max Load Current vs. V (Any V )
IN
OUT
R1 = 931kΩ, R2 = 294kΩ, L = 4.7μH, CFB = 22pF
100
80
60
T = 85°C
A
T = –40°C
A
40
20
TA = 25°C
0
0.5 1
1.5 2
2.5 3
3.5 4
4.5
VIN (V)
Min. Start-up Voltage vs. Temperature (Any V )
OUT
VOUT = 3.3V, IOUT = 1mA
0.9
0.85
0.8
0.75
0.7
0.65
0.6
-40
-20
0
20
40
60
Temperature (°C)
80
100
Load Transient
V = 3.3V, V = 1.5V, T =25°C
OUT
IN
A
IOUT = 40mA to
140mA
(50mA/div)
V
OUT
(100mV/div)
AC Coupled
Time = (100μs/div)
Startup Min Load Res. vs. V (Any V )
IN
OUT
R1 = 931kΩ, R2 = 294kΩ, L = 4.7μH, CFB = 22pF
160
140
T = –40°C
A
120
100
TA = 25°C
80
60
40
T = 85°C
A
20
0
0.5 1
1.5 2
2.5 3
3.5 4
4.5
VIN (V)
13
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