TPS65921 datasheet(21/66 Pages) TI

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TPS65921

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SWCS048G – MARCH 2010 – REVISED SEPTEMBER 2014

4.13 VDAC Low Dropout Regulator

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage

2.7

3.6

4.5

Output voltage including all

variations (line and load

1.164

1.236

VOUT

regulations, line and load

1.261

1.3

1.339

transients, temperature, and

1.746

1.8

1.854

process)

On mode

IOUT

Rated output current

Low-power mode

DC load regulation

On mode: 0 < IO < IMAX

On mode, VIN = VINmin to VINmax

DC line regulation

at IOUT = IOUTmax

IOUT = 0, CL = 1 μF (within 10% of

Turn-on time

100

µs

VOUT)

Wake-up time

Full load capability

µs

f < 20 kHz

20 kHz < f < 100 kHz

Ripple rejection

f = 1 MHz

VIN = VOUT + 1 V, IO = IMAX

200 Hz < f < 5 kHz

400

Output noise

5 kHz < f < 400 kHz

125

nV/

√Hz

400 kHz < f < 10 MHz

On mode, IOUT = 0

150

On mode, IOUT = IOUTmax

350

Ground current

Low-power mode, IOUT = 0

µA

Low-power mode, IOUT = 1 mA

Off mode at 55°C

VDO

Dropout voltage(1)

On mode, IOUT = IOUTmax

250

ILOAD: IMIN – IMAX

Transient load regulation(2)

–40

Slew: 60 mA/

μs

VIN drops 500 mV

Transient line regulation

Slew: 40 mV/

μs

Overshoot

Softstart

Pull down resistance

Default in off mode

250

320

450

(1)

For nominal output voltage

(2)

Transient load regulation is always included in the overall accuracy of the selected output voltage option. For voltage levels that have a

tighter output voltage specification than the transient load regulation, follow the output voltage specification.

Specifications

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