LTC2924 Datasheet, PDF (18/20 Pages) Linear Technology – Quad Power Supply Sequencer

LTC2924
TYPICAL APPLICATIO S
Precision Negative Rail Sequencer
Q1
–5V
0.1µF
10k
1.36k
1M
–
LM321
+
V_ON – 4.5V
V_OFF – 3.9V
7k
3V
5V
5V
EARLY
100k
0.1µF
0.1µF
0.1µF
2N3906 SOT-23
Q2
Q3
Q4
SYSTEM
CONTROLLER
10k 10k
150nF
150nF
V_ON = 2.79V
V_OFF = 2.73V
0.1µF
V_ON = 4.21V
V_OFF = 3.76V
V_CC
OUT1
IN1
OUT2
IN2
OUT3
IN3
OUT4
IN4
ON LTC2924
DONE
FAULT
TMR HYS/CFG
PGT GND
52.3k 45.3k 6.04k
V_ON = 3.32V
V_OFF = 2.80V
11.8k 7.68k 1.69k
Q1-Q4: IRL3714S
ALL RESISTORS 1%
49.9k
2924 TA06a
5V/DIV
5V/DIV
2V/DIV
2V/DIV
Power-Up Sequence
5V
3.3V
–5V
10ms/DIV
DONE
TMR
ON
2924 TA07b
5V/DIV
5V/DIV
2V/DIV
2V/DIV
Power-Down Sequence
5V
3.3V
–5V
DONE
10ms/DIV
TMR
ON
2924 TA07c
2924fa
18