TPS54073_16 datasheet(3/25 Pages) TI1

Part #	TPS54073

Description	2.2 ??4 -V, 14-A SYNCHRONOUS BUCK CONVERTER WITH DISABLED SINKING DURING START-UP

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ELECTRICAL CHARACTERISTICS

TPS54073

www.ti.com ............................................................................................................................................................................................ SLVS547 – FEBRUARY 2005

TJ = –40°C to 125°C, VIN = 3 V to 4 V, PVIN = 2.2 V to 4 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE, VIN

VI

Input voltage, VIN

3

4

V

Supply voltage range, PVIN

Output = 1.8 V

2.2

4

V

fs = 350 kHz, RT open, PH pin open, SYNC = 0 V,

6.3

10

mA

PVIN = 2.5 V

VIN = 3.3 V

fs = 550 kHz, RT open, PH pin open, SYNC ≥ 2.5 V,

8.6

13

mA

PVIN = 2.5 V

SHUTDOWN, SS/ENA = 0 V, PVIN = 2.5 V

1

1.4

mA

IQ

Quiescent current

fs = 350 kHz, RT open, PH pin open, SYNC = 0 V,

3.2

6

mA

VIN = 3.3 V

PVIN = 2.5 V

fs = 550 kHz, RT open, PH pin open, SYNC ≥ 2.5 V,

4.4

7

mA

VIN = 3.3 V

SHUTDOWN, SS/ENA = 0 V, VIN = 3.3 V

< 140

µA

UNDERVOLTAGE LOCKOUT (VIN)

Start threshold voltage, UVLO

2.9

3

V

Stop threshold voltage, UVLO

2.7

2.8

V

Hysteresis voltage, UVLO

100

mV

Rising and falling edge deglitch, UVLO(1)

2.5

µs

BIAS VOLTAGE

Output voltage, VBIAS

I(VBIAS) = 0

2.7

2.8

2.9

V

Output current, VBIAS(2)

100

µA

CUMULATIVE REFERENCE

Vref

Accuracy

0.882

0.891

0.900

V

REGULATION

Line regulation(3)(4)

IL = 7 A, fs = 350 kHz, TJ = 85°C

0.05

%/V

IL = 0 A to 14 A, fs = 350 kHz, TJ = 85°C

Load regulation(3)(4)

0.013

%/A

PVIN = 2.5 V, VIN = 3.3 V

OSCILLATOR

RT open(3), SYNC

≤ 0.8 V

280

350

420

Internally set—free running frequency

kHz

RT open(3), SYNC

≥ 2.5 V

440

550

660

RT = 180 k

Ω (1% resistor to AGND)(3)

252

280

308

Externally set—free running frequency range

RT = 100 k

Ω (1% resistor to AGND)

460

500

540

kHz

RT = 68 k

Ω (1% resistor to AGND)(3)

663

700

762

High-level threshold voltage, SYNC

2.5

V

Low-level threshold voltage, SYNC

0.8

V

Pulse duration, SYNC(3)

50

ns

Frequency range, SYNC

300

700

kHz

Ramp valley(3)

0.75

V

Ramp amplitude (peak-to-peak)(3)

1

V

Minimum controllable on time(3)

200

ns

Maximum duty cycle(3)

90%

(1)

Specified by design

(2)

Static resistive loads only

(3)

Specified by design

(4)

Specified by the circuit used in Figure 12

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