TPS54325_15 datasheet(6/26 Pages) TI

Part #	TPS54325

Description	TPS54325 4.5-V to 18-V, 3-A Output Synchronous Step Down Switcher with Integrated FET

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Manufacturer	TI [Texas Instruments]

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TPS54325

SLVS932F – MAY 2009 – REVISED NOVEMBER 2014

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Electrical Characteristics (continued)

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT LIMIT

Iocl

Current limit

TA = –40°C to 85°C

(1)

3.5

4.1

5.5

A

THERMAL SHUTDOWN

Shutdown temperature (1)

150

TSDN

Thermal shutdown threshold

°C

Hysteresis (1)

25

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

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

5

μs

UVP detect

65%

70%

75%

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

3.45

3.70

3.95

VUVLO

UVLO threshold

V

Hysteresis VREG5 voltage

0.15

0.25

0.35

6

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