SC187ULTRT datasheet(9/17 Pages) SEMTECH

Part #	SC187ULTRT

Description	4A, 2.2MHz Synchronous Step-Down Regulator with 15 Preset Output Voltages

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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9 / 17 page

SC187

Start Up (CTL

X) — No Load

Start Up (CTL

X) — Full Load

Typical Characteristics (continued)

Circuit Conditions: C

IN = 22µF/6.3V, COUT = 2 x 22µF/6.3V, CSS = 10nF. Unless otherwise noted, L = 1.0µH (TOKO: FDV0530S-1R0).

Time (500ns�div)

s�div)

�div)

V

OUT (1V/div)

V

CTLx (5V/div)

I

OUT (5V/div)

V

IN = 5V, = IOUT = 4A; VOUT = 1.5V

PGOOD (5V/div)

V

IN = 5.0V

I

OUT = 0A

Mode= Hi

Ch1:V

EN

Ch2: I

OUT

Ch3: V

OUT

Ch4: PGood

V

IN = 5.0V

I

OUT = 0A

Mode= Hi

Ch1:V

EN

Ch2: I

OUT

Ch3: V

OUT

Ch4: PGood

Start Up (CTL

X) — No Load

Start Up into Pre-Biased Output (V

OUT=1.5V)

Start Up into Pre-Biased Output (V

OUT=3.3V)

Time (500ns�div)

s�div)

�div)

V

OUT (1V/div)

V

CTLx (5V/div)

I

OUT (5V/div)

PGOOD (5V/div)

Time (500ns�div)

s�div)

�div)

V

OUT (2V/div)

V

CTLx (5V/div)

I

OUT (5V/div)

PGOOD (5V/div)

Time (500µs�div)

s�div)

�div)

V

OUT (2V/div)

V

CTLx (5V/div)

I

OUT (5A/div)

PGOOD (5V/div)

V

IN = 5V, = IOUT = 0; VOUT = 3.3V

Start Up (CTL

X) — Full Load

9

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