TPS54429 datasheet(4/22 Pages) TI1

No. de pieza	TPS54429

Descripción Electrónicos	7V to 18V Input, 4.5-A Synchronous Step-Down ( SWIFT?? Converter

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Fabricante Electrónico	TI1 [Texas Instruments]

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TPS54429

SLVSAS1

– FEBRUARY 2011

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, VIN = 12V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT LIMIT

Iocl

Current limit

LOUT = 1.5 μH

(2), T

A = -20ºC to 85ºC

5.2

5.9

8.0

A

THERMAL SHUTDOWN

Shutdown temperature (2)

165

TSDN

Thermal shutdown threshold

°C

Hysteresis (2)

30

ON-TIME TIMER CONTROL

TON

On time

VIN = 12 V, VO = 1.05 V

145

ns

TOFF(MIN)

Minimum off time

TA = 25°C, VFB = 0.7 V

260

310

ns

SOFT START

ISSC

SS charge current

VSS = 0 V

1.4

2.0

2.6

μA

ISSD

SS discharge current

VSS = 0.5 V

0.1

0.2

mA

POWER GOOD

VFB rising (good)

85

90

95

%

VTHPG

PG threshold

VFB falling (fault)

85

%

IPG

PG sink current

PG = 0.5 V

2.5

5

mA

OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION

VOVP

Output OVP trip threshold

OVP detect

115

120

125

%

TOVPDEL

Output OVP prop delay

10

μs

UVP detect

60

65

70

%

VUVP

Output UVP trip threshold

Hysteresis

10

%

TUVPDEL

Output UVP delay

0.25

ms

TUVPEN

Output UVP enable delay

Relative to soft-start time

x 1.7

UVLO

Wake up VREG5 voltage

3.5

3.8

4.1

VUVLO

UVLO threshold

V

Hysteresis VREG5 voltage

0.23

0.35

0.47

(2)

Not production tested.

4

Product Folder Link(s) :TPS54429

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