Power good window,

reference to REFIN

EN AND

V5IN

VREF

PGOOD

VOUT

Fixed

1.6 ms

soft-start

PGOOD

Delay

1.0 ms

+8%

±8%

Internal soft-start delay time

260 µs typical

400 µs typical

±5%

+16%

±16%

REFIN

Tme

R1

VREF

REFIN

7

9

R2

TPS53317

OUT

REF

R2

V

V

R1

R2

=

´

+

TPS53317

www.ti.com

SLUSAK4D – JUNE 2011 – REVISED JULY 2015

Feature Description (continued)

7.3.4 Power Sequences

7.3.4.1 Non-Tracking Startup

The TPS53317 device can be configured for non-tracking application. When non-tracking is configured, output

voltage is regulated to the REFIN voltage which taps off the voltage dividers from the 2-V reference voltage.

Either the EN pin or the V5IN pin can be used to start up the device. The device uses internal voltage servo DAC

to provide a 1.6-ms soft-start time during soft-start initialization. (See Figure 18.)

In a non-tracking application, the output voltage is determined by the resistive divider between the VREF pin and

the REFIN pin.

(2)

.

.

Figure 17. Non-Tracking Configuration

Figure 18. Non-Tracking Startup Timing

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