TPS54900

SLVS405 − OCTOBER 2001

2

www.ti.com

−0.3 V to 18 V

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−0.3 V to VIN + 0.3 V

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−0.3 V to 5 V

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Output voltage range‡, LX0, LX1, LX2, LX3

−0.5 V to VIN + 0.3 V

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−0.3 V to 5 V

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Continuous power dissipation

See Dissipation Rating Table

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−40

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−55

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead soldering temperature, 10 seconds

300

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

‡ All voltages values are with respect to device GND terminal.

DISSIPATION RATING TABLE−FREE-AIR TEMPERATURES§

PACKAGE

AIR FLOW

(CFM)

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

PW

0

500 mW

5 mW/

°C

275 mW

200 mW

§ Low-K PWB

recommended operating conditions (unless otherwise noted)

MIN

NOM

MAX

UNITS

Supply voltage, VIN

14.25

15

16

V

Output current, LX0, LX1, LX2, LX3

20

100

mA

Synchronized PWM frequency (see Note 1)

552

kHz

Inductor

200

225

250

µH

Output capacitor

10

µF

Operating junction temperature, TJ

−40

125

°C

NOTE 1: Synchronized PWM frequency equal to one eighth of SCLK frequency.

electrical characteristics over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY CURRENT

I(qq)

VI disable current

EN > VIH, all outputs software disabled

1.7

2.16

mA

I(q)

VI quiescent current

EN pin < VIL

0.7

1

mA

CUMULATIVE REGULATION

Regulation accuracy

Voltage codes 12.3 V, 12.7 V, 13.1 V

−2%

2%

Regulation accuracy

Voltage codes < 12.3 V

−2.5%

2.5%

OSCILLATOR

f(osc)

Free-run frequency

350

450

550

kHz

f(sync)

Sync frequency range

f(sync) = SCLK / 8

550

750

kHz

Phase stagger count

Phase difference after initialization command

(see Note 2)

4

SCLK

UVLO

V(UVLO)

Undervoltage lockout threshold

13

13.5

V

Vhys(UVLO)

UVLO hysteresis

1.3

1.45

1.6

V

NOTE 2: Ensured by design