TPS74701DRCT datasheet(11/24 Pages) TI

Part #	TPS74701DRCT

Description	500mA Low-Dropout Linear Regulator with Programmable Soft-Start

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Manufacturer	TI [Texas Instruments]

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DROPOUT VOLTAGE

Reference

SimplifiedBlock Diagram

V

OUT

BIAS

FB

IN

V

IN

V

=3.3V

5%

BIAS

±

V

=3.3V

5V

V

=1.5V

I

=1.5A

Efficiency=45%

IN

OUT

±

C

OUT

PROGRAMMABLE SOFT-START

Reference

SimplifiedBlock Diagram

V

OUT

BIAS

FB

IN

V

=5V

5%

BIAS

±

V

=1.8V

V

=1.5V

I

=1.5A

Efficiency=83%

IN

OUT

C

OUT

t

=

SS

(V

C

)

´

REF

SS

I

SS

(1)

t

=

SSCL

(V

C

)

´

OUT(NOM)

OUT

I

CL(MIN)

(2)

TPS74701

SBVS099A – NOVEMBER 2007 – REVISED NOVEMBER 2007

The TPS74701 offers very low dropout performance,

making it well-suited for high-current, low VIN/low

VOUT applications. The low dropout of the TPS74701

allows the device to be used in place of a dc/dc

converter and still achieve good efficiency. This

feature

provides

designers

with

the

power

architecture for their applications to achieve the

smallest, simplest, and lowest cost solution.

There are two different specifications for dropout

voltage with the TPS74701. The first specification

(shown in Figure 25) is referred to as VIN Dropout and

is used when an external bias voltage is applied to

achieve low dropout. This specification assumes that

VBIAS is at least 1.62V

(1) above V

OUT, which is the

Figure 26. Typical Application of the TPS74701

case for VBIAS when powered by a 3.3V rail with 5%

Without an Auxiliary Bias Rail

tolerance and with VOUT = 1.5V. If VBIAS is higher than

VOUT +1.62V

(1), V

IN dropout is less than specified.

The TPS74701 features a programmable, monotonic,

voltage-controlled

soft-start

that

is

set

with

an

external capacitor (CSS). This feature is important for

many applications because it eliminates power-up

initialization problems when powering FPGAs, DSPs,

or other processors. The controlled voltage ramp of

the output also reduces peak inrush current during

start-up, minimizing start-up transient events to the

input power bus.

To achieve a linear and monotonic soft-start, the

TPS74701 error amplifier tracks the voltage ramp of

the external soft-start capacitor until the voltage

exceeds the internal reference. The soft-start ramp

Figure 25. Typical Application of the TPS74701

time depends on the soft-start charging current (ISS),

Using an Auxiliary Bias Rail

soft-start

capacitance

(CSS),

and

the

internal

reference voltage (VREF), and can be calculated using

The second specification (shown in Figure 26) is

Equation 1:

referred

to

as

VBIAS Dropout and applies to

applications where IN and BIAS are tied together.

This option

allows

the

device

to

be

used

in

applications where an auxiliary bias voltage is not

If large output capacitors are used, the device current

available or low dropout is not required. Dropout is

limit (ICL) and the output capacitor may set the

limited by BIAS in these applications because VBIAS

start-up time. In this case, the start-up time is given

provides the gate drive to the pass FET; therefore,

by Equation 2:

VBIAS must be 1.39V above VOUT. Because of this

usage, IN and BIAS tied together easily consume

huge power. Pay attention not to exceed the power

rating of the IC package.

where:

VOUT(NOM) is the nominal output voltage,

COUT is the output capacitance, and

ICL(MIN) is the minimum current limit for the device.

In applications where monotonic startup is required,

the soft-start time given by Equation 1 should be set

greater than Equation 2.

(1)

1.62V is a test condition of this device and can be adjusted by

referring to Figure 8.

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