Datasheet

LTC2919
7
2919f
BLOCK DIAGRA
W
–
+
–
+
–
+
ADJUSTABLE
PULSE
GENERATOR
THREE-STATE
DECODE
THREE-STATE
DECODE
TMR
RST
OUT1
OUT2
GND
2919 BD
200ms
PULSE
GENERATOR
–
+
SEL
CONTROL 1CONTROL 2
EN
ADJ1
ADJ2
REF
V
CC
V
CC
6.5V
+
–
500mV
+
–
1.000V
V
CC
SEL
GND
OPEN
V
CC
CONTROL 1
H
L
L
CONTROL 2
H
H
L
CONTROL = H = NEGATIVE POLARITY
CONTROL = L = POSITIVE POLARITY
TI I G DIAGRA S
WWU
2919 TD
1V
1V
V
CC(UVLO)
V
CC(UVLO)
+ ΔV
CC(UVLO)
t
PROP
t
PROP
V
CC
OUT
t
UV
t
RST
RST
UVLO Timing
1V
V
RT
V
RT
– ΔV
RT
V
ADJ
t
PROP
t
RST
RST
Negative Polarity Input Timing
1V
t
PROP
t
PROP
OUT
V
ADJ
t
PROP
1V
V
RT
t
RST
RST
Positive Polarity Input Timing
V
RT
+ ΔV
RT
1V
t
PROP
t
PROP
OUT
NOTES:
1. ΔV
RT
AND ΔV
CC(UVLO)
= 0, except in
Comparator Mode
2. IN COMPARATOR MODE, t
RST
= t
PROP
.
PI FU CTIO S
UUU
(MSOP/DFN Package)
ADJ1 (Pin 10): Adjustable Voltage Input 1. Input to volt-
age monitor comparator 1 (0.5V nominal threshold). The
polarity of the input is selected by the state of the SEL
pin (refer to Table 1). Tie to REF if unused (with SEL =
V
CC
or Open).
Exposed Pad (Pin 11, DFN Only): The Exposed Pad may
be left unconnected. For better thermal contact, tie to a PCB
trace. This trace must be grounded or unconnected.