TPS54980

SLVS452A − FEBRUARY 2003 − REVISED FEBRUARY 2005

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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

3.0

4.0

V

I(Q)

Quiescent current

fs = 350 kHz, RT open,

PH pin open

9.8

17

mA

I(Q)

Quiescent current

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

14

23

mA

Shutdown, ENA = 0 V

1

1.4

UNDER VOLTAGE LOCK OUT

Start threshold voltage, UVLO

2.95

3.0

V

Stop threshold voltage, UVLO

2.70

2.80

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 = 4.5 A,fs = 350 kHz, TJ = 85°C

0.04

%/V

Line regulation(1)(3)

IL = 4.5 A,fs = 550 kHz, TJ = 85°C

0.04

%/V

Load regulation(1)(3)

IL = 0 A to 9 A, fs = 350 kHz, TJ = 85°C

0.03

%/A

Load regulation(1)(3)

IL = 0 A to 9 A, fs = 550 kHz, TJ = 85°C

0.03

%/A

OSCILLATOR

Internally set—free running frequency

RT open

280

350

420

kHz

RT = 180 k

Ω (1% resistor to AGND)

252

280

308

Externally set—free running frequency range

RT = 100 k

Ω (1% resistor to AGND)

460

500

540

kHz

Externally set—free running frequency range

RT = 68 k

Ω (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