SC189ASKTRT Semtech, SC189ASKTRT Datasheet - Page 12

• Manufacturer Part Number: SC189ASKTRT
• Description: 2.5MHz, 1.5A Synchronous Step Down Regulator In SOT-23_5
• Manufacturer: Semtech

© 2009 Semtech Corp.
Typical Waveforms (continued)
Circuit Conditions: V
Start Up into Pre-Biased Output (V
2V/div
2V/div
5V/div
2V/div
1V/div
2V/div
1V/div
2V/div
V
V
V
V
V
V
OUT
V
OUT
V
OUT
EN
EN
IN
IN
IN
Start Up into Pre-Bias Output (Enable)
V
R
V
R
V
R
Start Up (Power up V
IN
OUT
IN
OUT
IN
OUT
=5.0V
=5.0V
=5.0V
Shutdown (Disable) (V
=1k
=1k
=33
OUT
Shutdown-Disable (V
Start Up (V
=3.3V (SC189ZULTRT); L= 2.2uH (TOKO: 1071AS-2R2); C
OUT
200µs/div
200µs/div
500µs/div
=3.3V), EN=VIN
IN
) (V
OUT
OUT
OUT
=3.3V)
=3.3V)
OUT
=3.3V)
=3.3V)(Enable)
12
IN
= C
Start Up into Pre-Biased Output (V
Start Up into Pre-Bias Output (Power Up V
OUT
2V/div
2V/div
5V/div
2V/div
1V/div
1V/div
2V/div
V
V
V
V
V
OUT
V
OUT
V
OUT
= 10uF/6.3V (Murata: GRM21BR60J106K).
EN
IN
IN
IN
V
R
V
R
V
R
Start Up (Power up V
IN
OUT
IN
OUT
IN
OUT
=5.0V
=5.0V
=5.0V
Shutdown (Disable) (V
=2.2
=1k
=3.3
Shutdown-Disable (V
Start Up (V
OUT
200µs/div
200µs/div
100µs/div
=3.3V), EN=VIN
IN
) (V
OUT
OUT
OUT
=3.3V)
OUT
=3.3V)
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=3.3V)
=3.3V)(Power Up)
SC189
IN
)