lt3473a Linear Technology Corporation, lt3473a Datasheet - Page 6

• Manufacturer Part Number: lt3473a
• Description: Micropower 1a Boost Converter With Schottky And Output Disconnect
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
LT3473/LT3473A
6
13
7
8
9
4
3
5
9
100mV
100mV
FB
CTRL
PGOOD
GND
FB
CTRL
PGOOD
GND
Q5
Q5
+
+
+
+
A4
A4
–
–
W
–
–
–
+
+
–
+
+
1.25V
g
1.25V
g
V
V
m
m
REF
REF
AMPLIFIER
AMPLIFIER
ERROR
ERROR
GENERATOR
GENERATOR
Figure 2. LT3473A Block Diagram
Figure 1. LT3473 Block Diagram
RAMP
RAMP
Σ
Σ
–
+
–
+
V
V
11
7
IN
IN
BTH
A2
COMPARATOR
A2
COMPARATOR
BTH
V
V
C
C
SHDN
POWER SECTION
SHDN
POWER SECTION
10
6
+
–
+
–
OSCILLATOR
OSCILLATOR
A1
A1
1.2MHz
R
1.2MHz
R
S
S
Q
Q
ENABLE
ENABLE
A3
A3
DRIVER
DRIVER
–
+
–
+
12
8
Q1
Q1
SW
SW
DRIVER
DRIVER
PNP
PNP
Q3
Q4
Q2
Q2
OUT
CAP
NB1
NE1
NB2
NE2
OUT
CAP
3437 F02
3437 F01
1
2
3
4
5
6
1
2
3473f