LT3991 datasheet(10/24 Pages) LINER

Part #	LT3991

Description	42V, 2.5A Synchronous Step-Down Regulator

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT8611

10

8611p

BLOCK DIAGRAM

IMON (Pin 23): Proportional-to-Current Monitor Output.

This pin sources a voltage 20 times the voltage between

the ISP and ISN pins such that:

VIMON = 20 • (VISP-VISN).

IMON can source 200μA and sink 10μA. Float IMON if

unused.

ICTRL (Pin 24): Current Adjustment Pin. ICTRL adjusts

the maximum ISP-ISN drop before the LT8611 reduces

output current. Connect directly to INTVCC or float for

full-scale ISP-ISN threshold of 50mV or apply values

between GND and 1V to modulate current limit. There is

an internal 1.4μA pull-up current on this pin. Float or tie

to INTVCC when unused.

GND (Exposed Pad Pin 25): Ground. The exposed pad

must be connected to the negative terminal of the input

capacitor and soldered to the PCB in order to lower the

thermal resistance.

PIN FUNCTIONS

+

–

SLOPE COMP

INTERNAL 0.97V REF

OSCILLATOR

200kHz TO 2.2MHz

BURST

DETECT

3.4V

REG

M1

M2

CBST

CF

8611 BD

SW

L

BST

13-15

SWITCH

LOGIC

AND

ANTI-

SHOOT

THROUGH

ERROR

AMP

SHDN

±9%

VC

SHDN

TSD

INTVCC UVLO

VIN UVLO

SHDN

TSD

VIN UVLO

EN/UV

1V

+

–

+

–

4

6

ISP

R

20R

VOUT

RSEN

ICTRL

1

21

ISN

1.0V

R

22

24

25

IMON

GND

23

INTVCC

17

BIAS

18

PGND

7, 8

PG

19

FB

R1

C1

R3

OPT

R4

OPT

R2

RT

CSS

(OPT)

VOUT

20

TR/SS

2.2μA

2

RT

3

SYNC

1

VIN

CIN

CVCC

5, 6

1.4μA

COUT

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