User Manual

MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 1µF, C
OUT
= 10µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RESET OUTPUT
L
4.500 4.625 4.750
M
4.250 4.375 4.500
T
2.970 3.053 3.135
S
2.805 2.888 2.970
Z
2.250 2.313 2.375
Y
2.125 2.188 2.250
W
1.620 1.665 1.710
Reset Threshold (Preset Output
Voltage)
SET/SET1 = GND
V
1.530 1.575 1.620
V
L/T/Z/W
0.90 x
V
OUT
0.925 x
V
OUT
0.95 x
V
OUT
Reset Threshold (Adjustable
Output Voltage)
M/S/Y/V
0.85 x
V
OUT
0.875 x
V
OUT
0.90 x
V
OUT
V
OUT to Reset Delay V
OUT1
/V
OUT
falling 35 µs
D0 35 µs
D1
2.187 3.125 4.063
D2
8.75 12.5 16.25
D3 35 50 65
Reset Timeout Period
(CSRT = OUT/OUT1)
t
RP
V
OUT1
/V
OUT
rising
D4
140 200
260
ms
CSRT Ramp Current
800 1000 1250
nA
CSRT Ramp Threshold
1.185 1.218 1.255
V
WATCHDOG INPUT
CSWT = OUT/OUT1 (fixed)
280.0 400.0 520.0
Normal Watchdog Timeout Period
t
WD2
CSWT = 1500pF (adjustable)
170 236.2
290
ms
CSWT = OUT/OUT1 (fixed)
37.5 50.0 62.5
Fast Watchdog Timeout Period
SET Ratio = 8
t
WD1
CSWT = 1500pF (adjustable)
21.95 29.52 36.90
ms
CSWT = OUT/OUT1 (fixed)
18.75 25.0 31.25
Fast Watchdog Timeout Period
SET Ratio = 16
t
WD1
CSWT = 1500pF (adjustable)
10.80 14.76 18.45
ms
CSWT = OUT/OUT1 (fixed)
4.68 6.25 7.81
Fast Watchdog Timeout Period
SET Ratio = 64
t
WD1
CSWT = 1500pF (adjustable)
2.52 3.69 4.62
ms
Fast Watchdog Minimum Period t
WD0
2000
ns
CSWT Ramp Current Adjustable timeout
800 1000 1250
nA
CSWT Ramp Threshold Adjustable timeout
1.185 1.218 1.255
V
Undercurrent Threshold for
Watchdog Enable
7.0 10
13.8
mA
Undercurrent Threshold for
Watchdog Disable
357mA