TPS2350

SLUS574A − JULY 2003 − REVISED SEPTEMBER 2003

4

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ELECTRICAL CHARACTERISTICS

−VINA = −48 V, −VINB = 0 V, UV = 2.5 V, OV = 0.5 V, SENSE = 0 V, RAMP = 0 V, SOURCE = more negative of –VINA

Overload Comparator

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VTH_OL SENSE current overload threshold

100

120

140

mV

tRSP

Response time

SENSE – SOURCE = 200 mV

2

4

7

µs

Fault Timer

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOL

FLTTIM low−level output voltage, to −VINA

UV = −48 V

5

mV

ICHG

FLTTIM charging current, current limit mode

FLTTIM − SOURCE = 2 V

−54

−50

−41

µA

VFLT

FLTTIM fault threshold voltage to SOURCE

3.75

4.00

4.25

V

VRST

Fault reset threshold to SOURCE

0.5

V

IDSG

FLTTIM Discharge current, retry mode

FLTTIM – SOURCE = 2 V

0.38

0.75

µA

D

Output duty cycle during retry cycles

SENSE − SOURCE = 80 mV,

FLTTIM − SOURCE = 2 V

1.0%

1.5%

IRST

FLTTIM discharge current, timer reset mode

FLTTIM − SOURCE = 2 V, SENSE = V

1

mA

Logic Outputs (FLT, PG)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IOHFLT

FLT high-level output leakage current

UV = −48 V, FLT – SOURCE = 80 V

−10

10

A

IOHPG

PG high-level output leakage current

UV = −45 V, PG – SOURCE = 80 V

−10

10

µA

RDS(on)

FLT ON resistance

SENSE−SOURCE = 80 mV,

FLTTIM−SOURCE = 5 V,

I(FLT) = 1 mA

50

80

Ω

RDS(on)

PG ON resistance

UV = −48 V, IO(PG) = 1 mA

50

80

Supply Selector

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VTHA

Threshold voltage, −VINA falling

−VINB = −48 V, −VINA falling

−48.45

−48.40

−48.35

V

VTHB

Threshold voltage, −VINB falling

−VINA = −48 V, −VINB falling

−48.45

−48.40

−48.35

V

ISINK

GATA sink current

−VINA = 0 V, −VINB = −48 V,

GATA = −41 V

30

80

mA

ISOURCE GATA source current

−VINA = −48 V, −VINB = −0 V,

GATA = −41 V

−50

−20

µA

ISINK

GATB sink current

−VINA = −48 V, −VINB = −0 V,

GATB = −41 V

30

80

mA

ISOURCE GATB source current

−VINA = 0 V, −VINB = −48 V,

GATB = −41 V

−50

−20

µA

VOLA

GATA low voltage to –VINA

−VINA = 0 V, −VINB = −48 V

0.1

VOLA

GATA high voltage to –VINA

−VINA = −48 V, −VINB = 0 V

11

14

17

V

VOLB

GATB low voltage to –VINB

−VINA = −48 V, −VINB = 0 V

0.1

V

VOLB

GATB high voltage to −VINB

−VINA = 0 V, −VINB = −48 V

11

14

17

† All voltages are with respect to RTN unless otherwise stated.

‡ Currents are positive into and negative out of the specified terminal.