LTM4613 datasheet(10/34 Pages) LINER

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LTM4651

4651f

For more information www.linear.com/LTM4651

SIMPLIFIED BLOCK DIAGRAM

TEMP– (J2, J7): Temperature Sensor, Negative Input.

Collector and base of a 2N3906-genre PNP bipolar junc-

tion transistor (BJT). Optionally interface to temperature

monitoringcircuitrysuchasLTC2997, LTC2990,LTC2974

or LTC2975. Otherwise leave electrically open. Pins J2

and J7 are electrically connected together internal to the

LTM4651, and thus it is only necessary to connect one

TEMP– pin to monitoring circuitry. The remaining TEMP–

pin can be used for redundant connectivity or routed to an

ICTtestpointfordesign-for-testconsiderations,asdesired.

SW (H4): Switching Node of Switching Converter Stage.

Used for test purposes. May be routed a short distance

with a thin trace to a local test point to monitor switching

action of the converter, if desired, but do not route near any

sensitivesignals;otherwise,leaveelectricallyopencircuit.

NC (A6 – 7, B2, B6 – 7, C1, C6 – 7, D6 – 7, E6 – 7, F6 – 7,

G6 – 7, H6 – 7, K6 – 7, L6 – 7): No Connect Pins, i.e., Pins

with No Internal Connection. The NC pins predominantly

serve to provide improved mounting of the module to the

board. In one’s layout, NC pins are permitted to remain

electrically unconnected or can be connected as desired,

e.g., connected to a VOUT– plane for heat-spreading pur-

poses and/or to facilitate routing.

PIN FUNCTIONS

4651 BD

ISETb

RUN:

>1.2VTYP = ON

<1.07VTYP = OFF

1µF

CINH

SVIN

CINL

POWER CONTROL

AND ANALOG CIRCUITS

PGND

VOUT–

VIN

3.6V

TO 58V

PGDFB

VOUT–

GND

COMPa

COMPb

INTVCC

fSET

10pF

1.5nF

10nF

50Ω

VOUT–

249k

+– 2V

–

4.99k

220pF

PGOOD

LOGIC

VOUT–

0.1F

1Ω

400nH

TEMP–

TEMP+

SVOUT–

0.1F

VIN

0.1F

RISET

GNDSNS

TO CURRENT COMPARATORS,

PWM AND FET DRIVERS

HI-Z WHEN

VPGDFB – SVOUT–

IS WITHIN

0.6V ±7.5%

RPGDFB

LOAD-LOCAL

MLCCs (HIGH-

FREQUENCY

DECOUPLING)

VOUT–

UP TO 0A

DOWN TO (VIN–58V),

NO EXCEEDING 26V

BELOW PGND

COUTH

4.7F

×2

CDGND*

ERROR

AMPLIFIER

50A

–

RUN

(REFERRED

TO GND)

CLKIN

(REFERRED

TO GND)

EXTVCC

ISETa

RISET =

| VOUT– |

50µA

400kHz

DEFAULT

SVOUT–

100Ω

VINREG

COMP

BUFFER

PGOOD

(REFERRED

TO GND)

(CENTRALLY

LOCATED PNP

TEMP SENSOR)

CINOUT*

*CINOUT and CDGND OPTIONAL, FOR REDUCED

RADIATED EMI. SEE FIGURES 5 THROUGH 8.

ISVIN

ISVOUT–

LOAD

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