Datasheet

LTC1696
12
External Triggering
The LTC1696 has a feature which allows the output to be
latched into an active high state by pulling the TIMER/
RESET pin high even if both the feedback voltages at the
C1
1nF
6
5
4
1696 F04
1
2
3
LTC1696
RESET
5V
1.8V
Q2
2N7002
TRIGGER
Q3
2N7002
D1
1N4148
FB1
GND
V
CC
FB2
OUT
TIMER/
RESET
R1
44.2k
1%
1.5V
V
CC
3.3V
R2
38.3k
1%
R3
44.2k
1%
R5
6.8k
5%
Q1
2N7002
N-CHANNEL
×2
PRIMARY
INPUT
SUPPLY
R4
54.9k
1%
C2
0.1µF
POWER MANAGEMENT
CONTOLLER
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com  LINEAR TECHNOLOGY CORPORATION 2001
1696f LT/TP 0701 2K • PRINTED IN USA
Figure 4. External Triggering
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PowerPath and DirectSense are trademarks of Linear Technology Corporation.
APPLICATIO S I FOR ATIO
WUUU
FB1 and FB2 pins are below the trip threshold of the
internal comparator. The output is then reset by pulling the
TIMER/RESET pin low. Figure 4 shows a circuit that uses
the external triggering function of the LTC1696.