SC189EULTRT datasheet(10/23 Pages) SEMTECH

Part #	SC189EULTRT

Description	2.5MHz, 1.5A Synchronous Step Down Regulator

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Manufacturer	SEMTECH [Semtech Corporation]

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10

SC189

Start Up (Enable)(V

OUT=1.5V)

Start Up (Power up V

IN) (VOUT=1.5V)

Start Up into Pre-Bias Output (Enable)

Start Up (Enable)(V

OUT=1.5V)

Start Up (Power up V

IN) (VOUT=1.5V)

Shutdown (Disable) (V

OUT=1.5V)

V

OUT

1V/div

100µs/div

Start Up (V

OUT=1.5V)

V

IN=5.0V

R

OUT=1k



V

EN

2V/div

V

IN

2V/div

V

OUT

500mV/div

200µs/div

Start Up (V

OUT=1.5V), EN=VIN

V

IN

2V/div

V

IN=5.0V

R

OUT=1k



V

OUT

500mV/div

200µs/div

V

IN

2V/div

V

IN=5.0V

R

OUT=1k



Start Up into Pre-Biased Output (V

OUT=1.5V) Enable

V

EN

2V/div

V

OUT

1V/div

100µs/div

Start Up (V

OUT=1.5V)

V

EN

2V/div

V

IN

2V/div

V

IN=5.0V

R

OUT=1



V

OUT

500mV/div

200µs/div

Start Up (V

OUT=1.5V), EN=VIN

V

IN

2V/div

V

IN=5.0V

R

OUT=1



50µs/div

Shutdown-Disable

V

OUT

500mV/div

V

EN

2V/div

V

IN

2V/div

V

IN=5.0V

R

OUT=1.5



Typical Waveforms (continued)

Circuit Conditions: V

OUT=1.5V (SC189HULTRT); L= 2.2uH (TOKO: 1071AS-2R2); CIN= COUT= 10uF/6.3V (Murata: GRM21BR60J106K).

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