LT1304-5 LINER [Linear Technology], LT1304-5 Datasheet - Page 5

• Manufacturer Part Number: LT1304-5
• Description: Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown
• Manufacturer: LINER [Linear Technology]

BLOCK
Figure 1. LT1304 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown
I D AGRA
8
R1 = 355k (LT1304-3.3), 195k (LT1304-5)
R3
R4
SENSE
1
8
W
LBI
FB
590k
R1
S
1.17V
1.24V
V
REF
–
–
+
+
LBI
1
A1
1.17V
1.24V
V
REF
2
+
–
–
+
A3
Figure 2. LT1304-3.3/LT1304-5 Block Diagram
LB0
A1
LB0
2
ENABLE
A3
ENABLE
UNDERVOLTAGE
1.5 s OFF
TIMERS
6 s ON
7
LOCKOUT
1.5V
SHDN
UNDERVOLTAGE
OFF
1.5 s OFF
TIMERS
6 s ON
7
LOCKOUT
SHUTDOWN
1.5V
SHDN
OFF
BIAS
V
~1V
A2
IN
SHUTDOWN
DRIVER
+
BIAS
–
~1V
A2
+
LT1304/LT1304-3.3/LT1304-5
DRIVER
36mV
6
+
–
Q3
C1
1k
I
R2
LIM
1k
36mV
6
Q3
1k
I
3
LIM
R2
1k
Q2
R1
7.2
1
V
IN
L1
V
IN
3
Q2
R1
7.2
1
4
5
Q1
200
SW
GND
SW
4
5
D1
Q1
200
GND
1304 F02
+
C2
V
1304 F01
OUT
5