2
DEMO MANUAL DC194
MICROPOWER BOOST REGULATOR
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90
80
70
60
50
40
10
100
1000
DC194 G06
LT1317B
V
OUT
= 3.3V
V
IN
= 3V
V
IN
= 1.6V
V
IN
= 2.4V
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90
80
70
60
50
40
10
100
1000
DC194 G05
LT1317B
V
OUT
= 5V
V
IN
= 3.3V
V
IN
= 1.6V
V
IN
= 2.4V
INPUT VOLTAGE (V)
1.5
OUTPUT CURRENT (mA)
600
500
400
300
200
100
2.5
3.5
4.0
DC194 G02
2.0
3.0
4.5
5.0
TYPICAL
MINIMUM
V
OUT
= 5V
PACKAGE A D SCHE ATIC DIAGRA S
M
W
U
W
LT1317B Efficiency
INPUT VOLTAGE (V)
1.5
OUTPUT CURRENT (mA)
3.5
DC194 G01
2.0
2.5
3.0
600
500
400
300
200
100
V
OUT
= 3.3V
TYPICAL
MINIMUM
LT1317B Efficiency
Load Current vs Input Voltage
Load Current vs Input Voltage
Figure 1. Demo Board Schematic
1
2
3
4
V
C
FB
SHDN
GND
8
7
6
5
LBO
LBI
V
IN
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
LT1317CMS8
LT1317BCMS8
+
+
SHDN
LBI
LBO
SW
D1
MBR0520LT1
U1
LT1317CMS8(A)
LTHA
OR
LT1317BCMS8(B)
LTHB
L1
10
µ
H
6
3
7
8
5
1
4
2
3.3V
2
3
1
5V
JP1
C1
22
µ
F
10V
R4
OPT
R6
OPT
R7
OPT
R5
OPT
FB
V
C
GND
R3
33k
R1A
604k
3.3V
R1B
332k
5V
C2
100
µ
F
6.3V
R2
1.00M
C3
3300pF
C4
0.1
µ
F
V
OUT
GND
DC194 F01
C5
100pF
V
IN
V
IN
SHDN
LBI
LBO
NOTES:
1. FOR VERSION A: USE LT1317CMS8 (LTHA)
2. FOR VERSION B; USE LT1317BCMS8 (LTHB)
3. FOR 3.3V OUTPUT, INSTALL SHUNT AT
JP1 PINS 1, 2
FOR 5V OUTPUT, INSTALL SHUNT AT
JP1 PINS 2, 3
