TPS51511_15 datasheet(4/30 Pages) TI

Part #	TPS51511

Description	Synchronous Switcher Controller With 2-A LDO for GPU Power

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Manufacturer	TI [Texas Instruments]

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TPS51511

SLVS735A – FEBRUARY 2007 – REVISED APRIL 2007

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, V

V5IN = 5 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOSW OUTPUT

TA = 25°C

740.2

750

759.8

VVSWFB

VSWFB regulation voltage

TA = 0 to 85°C (3)

738.7

750

761.3

mV

TA = -40 to 85°C (3)

738.0

750

762.0

RVOSW

Input impedance, VOSW

750

k

Ω

VSWFB = 0.78 V, COMP = open

–0.04

µA

IVSWFB

Input current, VSWFB

VSWFB = 0.78 V, COMP = 5 V

–0.06

µA

IVOSWDischg

Discharge current, VOSW

ENSW = 0 V, VOSW = 0.5 V

8

15

35

mA

TRANSCONDUCTANCE AMPLIFIER

gm

Gain

TA = 25°C

240

300

360

µS

ENLDO=0 V, ENSW=5 V, VSWFB=0 V, VOSW=1.94 V,

ICOMPSNK

COMP maximum sink current

13

µA

COMP=1.28 V

ENLDO=0 V, ENSW=5 V, VSWFB=0 V, VOSW=1.66 V,

ICOMPSRC

COMP maximum source current

–13

µA

COMP=1.28 V

VCOMPHI

COMP high clamp voltage

ENLDO=0 V, ENSW=5 V, VSWFB=0 V, CS=0 V, VOSW=1.66 V

1.31

1.34

1.37

V

VCOMPLO

COMP low clamp voltage

ENLDO=0 V, ENSW=5 V, VSWFB=0V, CS=0 V, VOSW=1.94 V

1.18

1.21

1.24

V

DUTY CONTROL

TON

Operation on time

VIN = 12 V, VOSW = 1.8 V

400

ns

TON0

Startup on time

VIN = 12 V, VOSW = 0 V

125

ns

TONMIN

Minimum on time

TA = 25°C

100

ns

TOFFMIN

Minimum off time

TA = 25°C

350

ns

OUTPUT DRIVERS

Source, IDRVH = -100 mA

3

6

RDRVH

DRVH resistance

Ω

Sink, IDRVH = 100 mA

0.9

3

Source, IDRVL = -100 mA

3

6

RDRVL

DRVL resistance

Ω

Sink, IDRVL = 100 mA

0.9

3

DRVH-off to DRVL-on(3)

10

TD

Dead time

ns

DRVL-off to DRVH-on(3)

30

INTERNAL BST DIODE

VFBST

Forward voltage

VV5IN-VBST, IF = 10 mA, TA = 25°C

0.7

0.8

0.9

V

VBST = 34 V, LL = 28 V,

IVBSTLK

VBST leakage current

0.1

1

µA

VOSW = 1.87 V, TA = 25°C

ZERO CURRNT COMPARATOR

VZC

Zero current comparator offset

–10

0

10

mV

(3)

Ensured by design. Not production tested.

4

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