LTC7899 datasheet(7/50 Pages) AD

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Data Sheet

LTC7899

analog.com

Rev. 0

7 of 50

(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical

values, all voltages are with respect to VIN- unless otherwise noted. (GND to VIN-) = 12V, RUN = 5V, EXTVCC = INTVCC,

DRVSET = 0V, DRVUV = 0V, TGUP = TGDN = TGxx, BGUP = BGDN = BGxx, and DTCA and DTCB = 0V, unless

otherwise noted. )

PARAMETER

SYMBOL

CONDITIONS/COMMENTS

MIN

TYP

MAX

UNITS

EXTVCC LDO

Switchover Voltage

EXTVCC Rising

DRVUV = INTVCC, TA = 25°C

DRVUV = floating, TA = 25°C

DRVUV = 0V, TA = 25°C

7.5

5.9

4.6

7.7

6.1

4.8

8.0

6.4

5.1

EXTVCC Switchover

Hysteresis

EXTVCC Falling

250

INTVCC Regulation

Point

4.5

Spread Spectrum Oscillator and Phase-Locked Loop

Fixed Frequency

fOSC

PLLIN/SPREAD = 0V

FREQ = 0V, TA = 25°C

FREQ = INTVCC

FREQ = 374kΩ

FREQ = 75kΩ, TA = 25°C

FREQ = 14.7kΩ

320

2.0

450

370

2.25

100

500

2.5

420

2.5

550

kHz

MHz

kHz

MHz

Synchronizable

Frequency Range

fSYNC

PLLIN/SPREAD = External Clock

0.1

2.5

MHz

PLLIN Input High Level

2.2

PLLIN Input Low Level

0.5

Spread Spectrum

Frequency Range

(Relative to fOSC)

PLLIN/SPREAD = INTVCC

Minimum Frequency

Maximum Frequency

PGOOD Output

PGOOD Voltage Low

IPGOOD = 2mA, TA = 25°C

0.2

0.4

PGOOD Leakage

Current

PGOOD = 5V, TA = 25°C

-1

μA

PGOOD Trip Level VFBB

with Respect to Set

Regulated Voltage

TA = 25°C

VFBB Rising

Hysteresis

VFBB Falling

Hysteresis

-13

2.5

-10

2.5

-7

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