TPS51222

SLUS908 – JANUARY 2009............................................................................................................................................................................................... www.ti.com

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

OUTPUT DRIVERS

Source, V(VBST-DRVH) = 0.1 V

1.7

5

R(DRVH)

DRVH resistance

Ω

Sink, V(DRVH-SW) = 0.1 V

1

3

Source, V(VREG5-DRVL) = 0.1 V

1.3

4

R(DRVL)

DRVL resistance

Ω

Sink, V(DRVL-GND) = 0.1 V

0.7

2

CURRENT MONITOR

GIMON

Current monitor gain

50

VCSPx–VCSNx = 60 mV, 0.95 V < VCSNx < 12.6 V,

VIMON

Current monitor output

2.75

3.00

3.25

V

TA = 25°C

VCSPx–VCSNx = 0 mV, 0.95 V < VCSNx < 12.6 V,

VIMON-OFF

Current monitor output offset

–200

200

mV

TA = 25°C

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

V(EN12SSEND)

EN1/EN2 SS End Threshold

SS-End threshold at external soft start (3)

2

V

I(EN12)

EN1/EN2 Source Current

VEN1/EN2 = 0V

1.6

2

2.4

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

SKIPSELx = 0 V

–0.5

0.5

I(SKIPSEL)

SKIPSEL Input Current

µA

SKIPSELx = 5 V

–0.5

0.5

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

VVBST = 37 V, VSW = 32 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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