TPS51218_16 datasheet(5/27 Pages) TI1

Part #	TPS51218

Description	HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY

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Manufacturer	TI1 [Texas Instruments]

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TPS51218

www.ti.com

SLUS935B

– MAY 2009 – REVISED FEBRUARY 2012

ELECTRICAL CHARACTERISTICS (continued)

over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PROTECTION: CURRENT SENSE

ITRIP

TRIP source current

VTRIP = 1V, TA = 25°C

9

10

11

μA

TRIP current temperature

TCITRIP

On the basis of 25

°C

4700

ppm/

°C

coeffficient

Current limit threshold setting

VTRIP

VTRIP-GND Voltage

0.2

3

V

range

VTRIP = 3.0 V

355

375

395

VOCL

Current limit threshold

VTRIP = 1.6 V

185

200

215

mV

VTRIP = 0.2 V

17

25

33

VTRIP = 3.0 V

–395

–375

–355

VOCLN

Negative current limit threshold

VTRIP = 1.6 V

–215

–200

–185

mV

VTRIP = 0.2 V

–33

–25

–17

Positive

3

15

Adaptive zero cross adjustable

VAZCADJ

mV

range

Negative

–15

–3

PROTECTION: UVP AND OVP

VOVP

OVP trip threshold

OVP detect

115%

120%

125%

tOVPDEL

OVP propagation delay time

50-mV overdrive

1

μs

VUVP

Output UVP trip threshold

UVP detect

65%

70%

75%

Output UVP propagation delay

tUVPDEL

0.8

1

1.2

ms

time

tUVPEN

Output UVP enable delay time

From Enable to UVP workable

1.0

1.2

1.4

ms

UVLO

Wake up

4.20

4.38

4.50

VUVV5IN

V5IN UVLO threshold

V

Shutdown

3.7

3.93

4.1

THERMAL SHUTDOWN

Shutdown temperature (3)

145

TSDN

Thermal shutdown threshold

°C

Hysteresis(3)

10

(3)

Ensured by design. Not production tested.

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