LTM4613 datasheet(11/34 Pages) LINER

11 / 34 page

LTM4651

4651f

For more information www.linear.com/LTM4651

TEST CIRCUIT

DECOUPLING REQUIREMENTS

APPLICATION

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Test Circuit 1

CINH, CD

External High Frequency Input Capacitor Requirement,

24V ≤ VIN ≤ 34V, VOUT– = –24V

9.4

µF

COUTH

External High Frequency Output Capacitor Requirement

24V ≤ VIN ≤ 34V, VOUT– = –24V

µF

TA = 25°C. Refer to Test Circuit 1.

ISETa ISETb

VIN

SVIN

RUN

GND

CLKIN

INTVCC

VINREG

COMPa

COMPb

fSET

PGOOD

PGDFB

GNDSNS

PGND

VOUT–

SVOUT–

TEMP+

TEMP–

EXTVCC

LTM4651

VOUT–

–24V

UP TO 2A

AT VIN = 24V

COUTH

27µF

LOAD

COUTL*

68µF

RPGDFB

196k

RfSET

57.6k

RSET

480k

4.7 F

CINH

4.7 F

VIN

3.6V

TO 34V

4651 TC01

CTH

0.1 F

RTH

499Ω

CEXTVCC

1 F

REXTVCC**

0Ω

*Polarized output capacitors COUTL, if used, must be rated to withstand ~0.3V typical reverse polarity prior to LTM4651 start-up,

stemming from a weakly forward-biased body diode. In such cases, a Schottky diode should be connected between PGND and

VOUT– to limit the voltage. See the Applications Information section and Figures 33a and 33b.

**Outside the ATE Test environment, REXTVCC, if used, should not be 0Ω. See the Applications Information section.

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