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SC121ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
SC121
13
Typical Characteristics (continued)
Time = (400ns/div)
V
OUT
= 3.3V, V
IN
= 1.5V, I
OUT
= 50mA
V
OUT
ripple
(10mV/div)
I
L
(100mA/div)
V
LX
(5V/div)
Time = (100µs/div)
V
OUT
= 3.3V, V
IN
= 1.5V, T
A
=25°C
I
OUT
= 40mA to
140mA
(50mA/div)
V
OUT
(100mV/div)
AC Coupled
Load Transient
PWM Operation
0.5 1 1.5 2 2.5 3 3.5 4 4.5
0
20
40
60
80
100
V
IN
(V)
I
OUT
(mA)
R
1
= 931k
Ω
, R
2
= 294k
Ω
, L = 4.7
μ
H, C
FB
= 22pF
0.5 1 1.5 2 2.5 3 3.5 4 4.5
0
20
40
60
80
100
120
140
160
V
IN
(V)
Equivalent R
LOAD
(
Ω
)
R
1
= 931k
Ω
, R
2
= 294k
Ω
, L = 4.7
μ
H, C
FB
= 22pF
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
Startup Max Load Current vs. V
IN
(Any V
OUT
)
Startup Min Load Res. vs. V
IN
(Any V
OUT
)
V
OUT
= 3.3V, I
OUT
= 1mA
0.6
0.65
0.7
0.75
0.8
0.85
0.9
-40
-20
0204060
80 100
Temperature (°C)
Startup Voltage (V)
Min. Start-up Voltage vs. Temperature (Any V
OUT
)
SC121
14
Pin Descriptions
MLPD Pin # Pin Name Pin Function
1 LX Switching node — connect an inductor from the input supply to this pin.
2 GND Signal and power ground.
3IN
Battery or supply input — requires an external 10µF bypass capacitor (capacitance evaluated while under
V
IN
bias) for normal operation.
4 EN Enable digital control input — active high.
5FB
Feedback input — connect to GND for preset 3.3V output. A voltage divider is connected from OUT to GND
to adjust output from 1.8V to 5.0V.
6 OUT
Output voltage pin — requires an external 10µF bypass capacitor (capacitance evaluated while under V
OUT
bias) for normal operation.
T
Thermal
Pad
Thermal Pad is for heat sinking purposes — connect to ground plane using multiple vias — not connected
internally.
SC121
15
Block Diagram
-
+
V
REF
1.2 V
Start-up
Oscillator
Gate Drive
and
Logic
Control
Error
Amp.
-
+
Slope
Comp.
Oscillator and
Slope
Generator
PWM
Control
-
+
-
+
-
+
-
+
+
-
Current
Amplifier
P
LIM
Amp.
1.7 V
V
OUT
Comp.
IN
EN
FB
GND
LX
OUT
Bulk
Bias
+
-
N
LIM
Amplifier
PWM
Comp.
Output Voltage
Selection Logic
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

SC121ULTRT

Mfr. #:
Buy SC121ULTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators LOW VOLTAGE BOOST CONVRTR_PWM
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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