SC189ASKTRT Semtech, SC189ASKTRT Datasheet - Page 10

• 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
500mV/div
500mV/div
2V/div
2V/div
2V/div
2V/div
2V/div
1V/div
Start Up into Pre-Biased Output (V
V
V
V
V
V
V
OUT
V
OUT
V
OUT
EN
EN
IN
IN
Start Up into Pre-Bias Output (Enable)
IN
V
R
V
R
V
R
Start Up (Power up V
IN
OUT
IN
OUT
IN
OUT
=5.0V
=5.0V
=5.0V
=1k
=1k
=1k
Start Up (Enable)(V
OUT
Start Up (V
=1.5V (SC189HULTRT); L= 2.2uH (TOKO: 1071AS-2R2); C
Start Up (V
OUT
100µs/div
200µs/div
200µs/div
=1.5V), EN=VIN
IN
OUT
) (V
OUT
=1.5V)
=1.5V)
OUT
=1.5V)
OUT
=1.5V) Enable
10
IN
= C
500mV/div
500mV/div
2V/div
OUT
2V/div
2V/div
2V/div
2V/div
1V/div
V
V
V
V
V
V
V
OUT
V
OUT
OUT
= 10uF/6.3V (Murata: GRM21BR60J106K).
EN
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
=1
=1
=1.5
Start Up (Enable)(V
Start Up (V
Start Up (V
Shutdown-Disable
OUT
100µs/div
200µs/div
50µs/div
=1.5V), EN=VIN
IN
OUT
) (V
OUT
OUT
=1.5V)
=1.5V)
OUT
=1.5V)
=1.5V)
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