LT3477 데이터 시트보기 (PDF) - Linear Technology

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LT3477

3A, DC/DC Converter with Dual Rail-to-Rail Current Sense

Linear Technology 

LT3477

PI FU CTIO S (QFN/TSSOP)

ISP2 (Pin 13/ Pin 11): Second Current Sense (+) Pin. The

noninverting input to the second current sense amplifier.

Connect to ISN2 if not used.

ISN2 (Pin 14/ Pin 12): Second Current Sense (–) Pin. The

inverting input to the second current sense amplifier.

Connect to ISP2 if not used.

ISP1 (Pin 15/Pin 13): First Current Sense (+) Pin. The

noninverting input to the first current sense amplifier.

Connect to ISN1 if not used.

ISN1 (Pin 16/Pin 14): First Current Sense (–) Pin. The in-

verting input to the first current sense amplifier. Connect

to ISP1 if not used.

GND (Pins 17/Pin 15): Ground. Tie directly to local

ground plane.

SW (Pins 18, 19/Pins 16, 17): Switch Pins. Collector of

the internal NPN power switch. Connect the inductor and

diode here and minimize the metal trace area connected to

this pin to minimize electromagnetic interference.

Exposed Pad (Pin 21/Pin 21): Power Ground. Must be

soldered to PCB ground for electrical contact and rated

thermal performance.

BLOCK DIAGRA

ISP1 +

IA1

ISN1 –

IADJ1

–

VADJ

+ A1

+

ISP2 +

IA2

ISN2 –

IADJ2

FBP +

VA

FBN –

–

VADJ

+ A2

+

VREF

VREF

1.25V

SHDN VIN

SS

VC

A3

–

A4

SLOPE +

RQ

S

Σ

OSCILLATOR

RT

Figure 1. LT3477 Block Diagram

6

SW

Q1

3477 F01

3477fb

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