MAX16039 Maxim Integrated Products, MAX16039 Datasheet - Page 14

• Manufacturer Part Number: MAX16039
• Description: (MAX16033 - MAX16040) Low-Power Battery Backup Circuits
• Manufacturer: Maxim Integrated Products

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Low-Power Battery Backup
Circuits in Small µDFN Packages
Figure 8. (a) Adding Additional Hysteresis to the Power-Fail Comparator. (b) Shifting the Additional Hysteresis above V
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PFO
V
V
V
V
V
0V
TRIP
H
L
PFT
PFH
V
(a)
IN
=
R1
R2
=
=
=
(
V
=
V
PFT
PFT
1 235
12
V
.
PFT
mV
⎛
⎜
⎝
C1
1
+
TO µP
+
V
⎛
⎜
⎝
1
V
V
L
R
+
PFH
R
R3
2
1
V
R
R
)
TRIP
+
2
⎛
⎜
⎝
1
PFI
PFO (PUSH-PULL)
1
⎞
⎟
⎠
R
R
+
3
1
MAX16033–
MAX16040
V
H
⎞
⎟ −
⎠
R
R
GND
1
2
V
CC
+
R
R
3
1
R
R
1
3
V
⎞
⎟
⎠
CC
V
IN
V
V
V
V
V
V
TRIP
H
L
PFT
PFH
D
PFO
0V
(b)
=
V
=
=
IN
=
=
(
V
R1
R2
DIODE FORWARD VOLTAGE
=
V
TRIP
1 235
PFT
12
V
.
PFT
mV
+
V
⎛
⎜
⎝
C1
1
V
TO µP
PFH
+
V
TRIP
R
R
R3
)
⎛
⎜
⎝
1
2
1
⎞
⎟
⎠
+
PFI
PFO (PUSH-PULL)
R
R
2
1
MAX16033–
MAX16040
V
H
+
GND
V
CC
R
R
1
3
⎞
⎟ −
⎠
TRIP
R
R
1
3
V
IN
V
D