TPS74812DRCR datasheet(11/19 Pages) TI

No. de pieza	TPS74812DRCR

Descripción Electrónicos	1.5A LDO Linear Regulator with Programmable Soft-Start

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Fabricante Electrónico	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)

TPS74801

SBVS074 – JANUARY 2007

The TPS74801 offers very low dropout performance,

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

VOUT applications. The low dropout of the TPS74801

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

converter and still achieve good efficiency. This

provides designers with the power architecture for

their application to achieve the smallest, simplest,

and lowest cost solution.

There are two different specifications for dropout

voltage with the TPS74801. The first specification

(shown in Figure 26) 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 1.56V above VOUT, which is the

Figure 27. Typical Application of the TPS74801

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 less than

VOUT +1.56V, VIN dropout is less than specified.

The TPS74801 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

TPS74801 error amplifier tracks the voltage ramp of

the external soft-start capacitor until the voltage

exceeds the internal reference. The soft-start ramp

Figure 26. Typical Application of the TPS74801

time is dependant on the soft-start charging current

Using an Auxiliary Bias Rail

(ISS), soft-start capacitance (CSS), and the internal

reference voltage (VREF), and can be calculated

The second specification (shown in Figure 27) is

using 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

available or low dropout is not required. Dropout is

current limit (ICL) and the output capacitor may set

limited by BIAS in these applications because VBIAS

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

provides the gate drive to the pass FET; therefore,

given by Equation 2:

VBIAS must be 1.56V above VOUT.

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.

11

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