LTC1702A datasheet(7/24 Pages) LINER

tên linh kiện	LTC1702A

Giải thích chi tiết về linh kiện	High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency

PDF	24 Pages

Scroll/Zoom	100%

nhà sản xuất	LINER [Linear Technology]

Trang chủ	http://www.linear.com

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7 / 24 page

LT3844

3844fb

FUNCTIONAL DIAGRAM

PIN FUNCTIONS

BOOST (Pin 16): The BOOST pin is the supply for the

bootstrapped gate drive and is externally connected to a

low ESR ceramic boost capacitor referenced to SW pin.

The recommended value of the BOOST capacitor, CBOOST,

is 50 times greater than the total input capacitance of the

topside MOSFET. In most applications 0.1μF is adequate.

The maximum voltage that this pin sees is VIN + VCC,

ground referred.

Exposed Pad (Pin 17): SGND. The exposed leadframe is

internally connected to the SGND pin. Solder the exposed

pad to the PCB ground for electrical contact and optimal

thermal performance.

–

VIN

UVLO

(<4V)

BST

UVLO

REGULATOR

FEEDBACK

REFERENCE

–

1.231V

3.8V

REGULATOR

INTERNAL

SUPPLY RAIL

VIN

VCC

UVLO

(<6V)

SHDN

DRIVE

CONTROL

NOL

SWITCH

LOGIC

DRIVE

CONTROL

BURST_EN

CSS

SENSE–

VFB

0.5V

2μA

50μA

Burst Mode

OPERATION

OSCILLATOR

SLOPE COMP

GENERATOR

BOOST

VCC

PGND

SYNC

fSET

RSET

SENSE+

SGND

BOOSTED SWITCH

DRIVER

CURRENT

SENSE

COMPARATOR

100mV

VREF + 200mV

SOFT-START

BURST DISABLE

DRIVER

FAULT CONDITION:

VIN UVLO

VCC UVLO

VSHDN UVLO

CSS CLAMPED TO

VFB + VBE

VREF

~1V

ERROR

AMP

–

(OPTIONAL)

RSENSE

3844 FD

CC2

CC1

VIN

CIN

CBOOST

VOUT

COUT

CVCC

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