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LT3477

3477fc

PIN FUNCTIONS (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.

–

∑

–

IA1

ISP1

ISN1

SLOPE

VADJ

IADJ1

ISP2

ISN2

FBP

FBN

SHDN

IADJ2

VREF

–

IA2

–

VIN

VADJ

VREF

1.25V

RQ1

3477 F01

OSCILLATOR

Figure 1. LT3477 Block Diagram

BLOCK DIAGRAM

LT3477 Datasheet(PDF) 6 Page - Linear Technology

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