TPS40197 datasheet(4/28 Pages) TI1

No de pièce	TPS40197

Description	SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE FOR SMART-REFLEX??DSPs

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Fabricant	TI1 [Texas Instruments]

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TPS40197

SLUS886A – NOVEMBER 2008 – REVISED JULY 2012

www.ti.com

ELECTRICAL CHARACTERISTICS

–40°C

≤ TJ ≤ 85°C, VVDD = 12 V, all parameters at zero power dissipation (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOLTAGE REFERENCE AND VID

0.9 V

≤ VVID ≤ 1.2 V, 0°C ≤ TJ ≤ 85°C

–0.5%

0.5%

VFB

FB input voltage

VVID

0.9 V

≤ VVID ≤ 1.2 V, –40°C ≤ TJ ≤ 85°C

–1.0%

1.0%

IVID

VID pull-up current

50

80

120

μA

VVID

VID pull-up voltage

1.60

1.68

1.78

V

tANTI-SKEW

Anti-skew filtering time

300

550

750

ns

(1)

VVIDH

VID high-level input voltage

0.8

1.0

1.3

V

VVIDL

VID low-level input voltage

0.30

0.55

0.70

V

IREF

REF source/sink current

400

650

850

μA

INPUT SUPPLY

Normal input supply voltage

VVDD

4.5

14.0

V

range

VENABLE = 3 V

2.5

4.5

mA

IVDD

Operating current

VENABLE = 0.6 V

45

70

μA

SOFT-START

tSS

Soft-start time

3.3

5.5

7.0

tSSDLY

Soft-start delay time

1.3

2.3

4.0

ms

tREG

Time to regulation

5.0

8.0

11.0

ON-BOARD REGULATOR

VBP

Output voltage

VVDD > 6 V, IBP ≤ 10 mA

5.1

5.3

5.5

V

Regulator dropout voltage

VDO

VVDD >5 V, IBP ≤ 25 mA

350

550

mV

(VVDD–VBP)

ISC

Regulator current limit threshold

50

mA

IBP

Average current

50

OSCILLATOR

fSW

Switching frequency

420

520

600

kHz

VRAMP

(1)

Ramp amplitude

1

V

PWM

DMAX

(1)

Maximum duty cycle

85%

tON(min)

(1)

Minimum controllable pulse

110

HDRV off to LDRV on

50

ns

tDEAD

Output driver dead time

LDRV off to HDRV on

25

ERROR AMPLIFIER

GBWP

(1)

Gain bandwidth product

7

10

MHz

AOL

(1)

Open loop gain

60

dB

Input bias current (current out of

IIB

100

nA

FB pin)

IEAOP

Output source current

VFB = 0 V

1

mA

IEAOM

Output sink current

VFB = 2 V

1

UNDERVOLTAGE LOCKOUT

VUVLO

Turn-on voltage

3.9

4.2

4.4

V

UVLOHYST

Hysteresis

700

850

1000

mV

SHUTDOWN

VIH

High-level input voltage, ENABLE

1.9

3.0

V

VIL

Low-level input voltage, ENABLE

0.6

1.2

(1)

Specified by design. Not production tested.

4

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