TPS54880 datasheet(3/23 Pages) TI1

No. de pieza	TPS54880

Descripción Electrónicos	4-V TO 6-V INPUT, 8-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs

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Fabricante Electrónico	TI1 [Texas Instruments]

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TPS54880

SLVS450A − OCTOBER 2002 REVISED APRIL 2005

www.ti.com

3

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range unless otherwise noted

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE, VIN

Input voltage range, VIN

4.0

6.0

V

I

Quiescent current

fs = 350 kHz, RT open,

PH pin open

11

15.8

mA

I(Q)

Quiescent current

fs = 500 kHz, RT = 100 kΩ, PH pin open

16

23.5

mA

Shutdown, ENA = 0 V

1

1.4

UNDER VOLTAGE LOCK OUT

Start threshold voltage, UVLO

3.8

3.85

V

Stop threshold voltage, UVLO

3.4

3.5

V

Hysteresis voltage, UVLO

0.14

0.16

V

Rising and falling edge deglitch, UVLO(1)

2.5

µs

BIAS VOLTAGE

Output voltage, VBIAS

I(VBIAS) = 0

2.70

2.80

2.90

V

Output current, VBIAS (2)

100

µA

CUMULATIVE REFERENCE

Vref

Accuracy

0.882

0.891

0.900

V

REGULATION

Line regulation(1)(3)

IL = 3 A, fs = 350 kHz, TJ = 85°C

0.04

%/V

Line regulation(1)(3)

IL = 3 A, fs = 550 kHz, TJ = 85°C

0.04

%/V

Load regulation(1)(3)

IL = 0 A to 6 A, fs = 350 kHz, TJ = 85°C

0.03

%/A

Load regulation(1)(3)

IL = 0 A to 6 A, fs = 550 kHz, TJ = 85°C

0.03

%/A

OSCILLATOR

Internally set—free running frequency

RT open

280

350

420

kHz

RT = 180 kΩ (1% resistor to AGND)

252

280

308

Externally set—free running frequency range

RT = 100 kΩ (1% resistor to AGND)

460

500

540

kHz

Externally set free running frequency range

RT = 68 kΩ (1% resistor to AGND)

663

700

762

kHz

Ramp valley(1)

0.75

V

Ramp amplitude (peak-to-peak)(1)

1

V

Minimum controllable on time(1)

200

ns

Maximum duty cycle

90%

(1) Specified by design

(2) Static resistive loads only

(3) Specified by the circuit used in Figure 9

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