LT1302-5 Linear Technology, LT1302-5 Datasheet - Page 5

• Manufacturer Part Number: LT1302-5
• Description: Micropower High Output Current Step-Up Adjustable and Fixed 5V DC/DC Converters
• Manufacturer: Linear Technology

PI FU CTIO S
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct.
PGND (Pin 8): Power Ground. Pins 8 and 1 should be
connected under the package. In the SO package, pins 1
BLOCK DIAGRA
100pF
U
V
C5
IN
C1
+
U
R1
R2
4
3
FB
SHDN
REFERENCE
U
1.24V
SHUTDOWN
W
1
SM
GND
V
15mV
OS
+
–
–
+
A1
CMP1
HYSTERETIC
COMPARATOR
ERROR
AMPLIFIER
Figure 2. LT1302 Block Diagram
V
ENABLE
IN
Q5
6
2
R3
22k
V
2
V
IN
C
C4
0.01 F
A
OSCILLATOR
220kHz
C2
0.1 F
and 8 are thermally connected to the die. One square inch
of PCB copper provides an adequate heat sink for the
device.
OFF
A2
V
Q1
IN
+
–
L1
Q2
5
300
I
36mV
T
BIAS
A3
730
R5
DRIVER
3.6k
LT1302/LT1302-5
Q3
R4
1.75
7
8
Q4
160X
SW
PGND
D1
+
1302 F02
C3
V
OUT
5