VOUT (500 mV/DIV)

RLOAD = 1.2

Ö

RFB1 = 0

Ö

VSS/TRK (500 mV/DIV)

TIME (4 ms/DIV)

VEN (1V/DIV)

VOUT (500 mV/DIV)

RLOAD = 1.2Ö

TIME (200 és/DIV)

VOUT (500 mV/DIV)

RLOAD = 1.2

Ö

VEN (5V/DIV)

CSS/TRK = None

CSS/TRK = 33 nF

CSS/TRK = 68 nF

TIME (2 ms/DIV)

VOUT (50 mV/DIV)

VIN (1V/DIV)

TIME (100 és/DIV)

VIN (3V to 5V)

LM20146

SNVS563C – FEBRUARY 2008 – REVISED APRIL 2013

www.ti.com

Typical Performance Characteristics (continued)

Unless otherwise specified: CIN = COUT = 100µF, L = 1.0µH (TDK SPM6530T-1R0M120), VIN = 5V, VOUT = 1.2V, RLOAD =

1.2

Ω, fSW = 500 kHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others.

Line Transient Response

Start-Up (Soft-Start)

Figure 20.

Figure 21.

Start-Up (Tracking)

Power Down

Figure 22.

Figure 23.

Short Circuit Input Current

PGOOD

vs.

vs.

VIN

IPGOOD

Figure 24.

Figure 25.

8

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