LT3477 LINER [Linear Technology], LT3477 Datasheet - Page 6

• Manufacturer Part Number: LT3477
• Description: 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
• Manufacturer: LINER [Linear Technology]

BLOCK DIAGRA
PI FU CTIO S
LT3477
I
noninverting input to the second current sense amplifier.
Connect to I
I
inverting input to the second current sense amplifier.
Connect to I
I
noninverting input to the first current sense amplifier.
Connect to I
I
verting input to the first current sense amplifier. Connect
to I
6
SP2
SN2
SP1
SN1
U
SP1
(Pin 16/Pin 14): First Current Sense (–) Pin. The in-
(Pin 13/ Pin 11): Second Current Sense (+) Pin. The
(Pin 15/Pin 13): First Current Sense (+) Pin. The
(Pin 14/ Pin 12): Second Current Sense (–) Pin. The
if not used.
I
I
I
I
I
I
FBP
FBN
V
U
SP1
SN1
ADJ1
SP2
SN2
ADJ2
REF
SN2
SP2
SN1
+
–
+
–
+
–
if not used.
if not used.
if not used.
IA1
IA2
VA
U
1.25V
V
REF
V
V
ADJ
ADJ
(QFN/TSSOP)
W
–
+
+
–
+
+
SHDN
A1
A2
V
IN
Figure 1. LT3477 Block Diagram
A3
SS
SLOPE
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.
Σ
V
C
–
+
A4
OSCILLATOR
R
S
R
T
Q
+
–
Q1
SW
3477 F01
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