1308AI Linear Technology Corporation, 1308AI Datasheet - Page 10

• Manufacturer Part Number: 1308AI
• Description: Lt1308b - Single Cell High Currentmicropower 600khz Boost Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LT1308A/LT1308B
10
APPLICATIONS
GROUND PLANE
SHUTDOWN
MULTIPLE
VIAs
R1
Figure 7. Recommended Component
Placement for TSSOP Boost Converter.
Placement is Similar to Figure 4.
GND
R2
1
2
3
4
5
6
7
U
LT1308A
LT1308B
C2
GROUND PLANE
SHUTDOWN
+
INFORMATION
U
LBI
MULTIPLE
R1
VIAs
LBO
Figure 9. Recommended Component Placement for SEPIC
14
13
12
11
10
9
8
R2
GND
V
C1
OUT
W
+
1
2
3
4
LT1308A
LT1308B
C3
C1
+
D1
V
L1
+
U
LBI
IN
LBO
1308 F07
8
7
6
5
V
OUT
3V TO
C1: AVX TAJC476M016
C2: TAIYO YUDEN EMK325BJ475(X5R)
C3: AVX TPSD227M006
A SEPIC (Single-Ended Primary Inductance Converter)
schematic is shown in Figure 8. This converter topology
produces a regulated output over an input voltage range
that spans (i.e., can be higher or lower than) the output.
Recommended component placement for an SO-8 pack-
age SEPIC is shown in Figure 9.
10V
L1A
V
V
D1
C2
IN
IN
+
SHUTDOWN
Figure 8. SEPIC (Single-Ended Primary
Inductance Converter) Converts 3V to 10V
Input to a 5V/500mA Regulated Output
C1
47μF
L1B
SHDN
V
V
IN
C
47k
CTX10-2
LT1308B
680pF
L1A
GND
SW
D1: IR 10BQ015
L1: COILTRONICS CTX10-2
FB
1308 F09
CERAMIC
4.7μF
C2
R2
100k
309k
R1
L1B
D1
+
1308A/B F08
1308abfa
C3
220μF
6.3V
V
5V
500mA
OUT