S

T

1.045

W

¦

N+]

R (k )

32537



:

u

SS

REF

SS

SS

C

(nF) V

(V)

t

(ms)

I

( A)

K



2

EN

ENB

START

EN

EN

ENT

V

R

V

V

I

R





START

STOP

ENT

HYS

V

V

R

I



EN

VIN

LMR14020

www.ti.com

SNVSAA5A – FEBRUARY 2015 – REVISED APRIL 2015

Feature Description (continued)

Figure 15. System UVLO By Enable Dividers

(2)

(3)

disable device.

8.3.7 External Soft-start

The LMR14020 has soft-start pin for programmable output ramp up time. The soft-start feature is used to prevent

inrush current impacting the LMR14020 and its load when power is first applied. The soft-start time can be

= 3

Equation 4:

(4)

The internal soft-start resets while device is disabled or in thermal shutdown.

8.3.8 Switching Frequency and Synchronization (RT/SYNC)

The switching frequency of the LMR14020 can be programmed by the resistor RT from the RT/SYNC pin and

GND pin. The RT/SYNC pin can’t be left floating or shorted to ground. To determine the timing resistance for a

(5)

Copyright © 2015, Texas Instruments Incorporated

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