TPS51220RHBT datasheet(6/37 Pages) TI

Part #	TPS51220RHBT

Description	Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

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Manufacturer	TI [Texas Instruments]

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TPS51220

SLVS785 – OCTOBER 2007

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, EN = 3.3V, VIN = 12V, V5SW = 5V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

UVP, OVP AND UVLO

V(OVP)

OVP Trip Threshold

OVP detect

110%

115%

120%

t(OVPDLY)

OVP Prop Delay

1.5

μs

V(UVP)

UVP Trip Threshold

UVP detect

65%

70%

73%

t(UVPDLY)

UVP Delay

0.8

1

1.2

ms

Wake up

1.7

1.8

1.9

V

V(UVREF2)

VREF2 UVLO Threshold

Hysteresis

75

100

125

mV

Wake up

3

3.1

3.2

V(UVREG3)

VREG3 UVLO Threshold

V

Hysteresis

0.10

0.15

0.20

Wake up

4.1

4.2

4.3

V

V(UVREG5)

VREG5 UVLO Threshold

Hysteresis

0.35

0.40

0.44

V

INTERFACE AND LOGIC THRESHOLD

Wake up

0.8

1

1.2

V(EN)

EN Threshold

V

Hysteresis

0.1

0.2

0.3

Wake up

0.45

0.50

0.55

V(EN12)

EN1/EN2 Threshold

V

Hysteresis

0.1

0.2

0.3

EN1/EN2 SS Start

V(EN12SS)

SS-ramp start threshold at external soft start

1

V

Threshold

EN1/EN2 SS End

V(EN12SSEND)

SS-End threshold at external soft start (3)

2

V

Threshold

I(EN12)

EN1/EN2 Source Current

VEN1/EN2 = 0V

1.5

2

2.6

μA

Continuous

1.5

Auto Skip

1.9

2.1

SKIPSEL1/SKIPSEL2

V(SKIPSEL)

V

Setting Voltage

OOA Skip (min 1/8 Fsw)

3.2

3.4

OOA Skip (min 1/16 Fsw)

3.8

V(OCL-ULV), Discharge ON

1.5

V(OCL-ULV), Discharge OFF

1.9

2.1

V(TRIP)

TRIP Setting Voltage

V

V(OCL-LV), Discharge OFF

3.2

3.4

V(OCL-LV), Discharge ON

3.8

Current mode, OVP enable

1.5

D-CAP mode, OVP disable

1.9

2.1

V(FUNC)

FUNC Setting Voltage

V

D-CAP mode, OVP enable

3.2

3.4

Current mode, OVP disable

3.8

TRIP = 0 V

–1

1

I(TRIP)

TRIP Input Current

μA

TRIP =5 V

–1

1

SKIPSELx = 0 V

–1

1

I(SKIPSEL)

SKIPSEL Input Current

μA

SKIPSELx = 5 V

–1

1

BOOT STRAP SW

V(FBST)

Forward Voltage

VVREG5-VBST, IF = 10 mA, TA = 25°C

0.10

0.20

V

I(BSTLK)

VBST Leakage Current

VBST = 30 V, SW = 25 V

0.01

1.5

μA

THERMAL SHUTDOWN

Shutdown temperature(3)

150

T(SDN)

Thermal SDN Threshold

°C

Hysteresis(3)

10

(3)

Specified by design.

6

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