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MAX16024LTBR+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
Applications Information
The MAX16023/MAX16024 are protected for typical
short-circuit conditions of 10s or less. Shorting OUT to
ground for longer than 10s might damage the device.
Bypass V
CC
and BATT to GND with a 0.1µF capacitor
each. Connect a 10µF low-ESR capacitor from OUT to
GND. All capacitors should be mounted as close as
possible to the device.
Monitoring an Additional Supply
The MAX16023 power-fail comparator can monitor
either positive or negative supplies using a resistive
divider to PFI (Figures 3 and 4). PFO can be used to
generate an interrupt to the µP or to trigger a reset. To
monitor a negative supply, connect the top of the resis-
tive divider to V
CC
. Connect the bottom of the resistive
divider to the negative voltage to be monitored.
Adding Hysteresis to PFI
The power-fail comparators have a typical input hys-
teresis of V
PFI-HYS
. This is sufficient for most applica-
tions where a power-supply line is being monitored
through an external voltage-divider (see the
Monitoring
an Additional Supply
section). Figure 5 shows how to
add hysteresis to the power-fail comparator. Select the
ratio of R1 and R2 such that PFI sees V
PFT
when V
IN
falls to the desired trip point (V
TRIP
). Resistor R3 adds
hysteresis. R3 is typically an order of magnitude greater
than R1 or R2. The current through R1 and R2 should
be at least 100µA to ensure that the 1µA (max) PFI
input current does not shift the trip point. R3 should be
larger than 50kΩ to prevent it from loading down PFO.
Capacitor C1 adds additional noise rejection.
MAX16023/MAX16024
Battery-Backup Circuits with
Regulated Output Voltage
______________________________________________________________________________________ 13
MAX16023L
0.1µF
GND
PFI
R2
R1
MR
PFO
ADDITIONAL SUPPLY RESET VOLTAGE
RESET
V
2
V
CC
V
1
RESET
µP
V
2(RESET)
= V
PFT
x
( )
R1 + R2
R2
Figure 3. Monitoring an Additional Supply by Connecting PFO
to MR
MAX16023
0.1μF
GND
PFI
R2
R1
PFO
V
CC
V
TRIP
= V
PFT
-
(
5 - V
PFT
)
R2
R1
V
TRIP
IS NEGATIVE
V-
5V
PFO
0
+5V
V
TRIP
V-
0
Figure 4. Monitoring a Negative Supply
MAX16023/MAX16024
Operation Without a Backup
Power Source
The MAX16023/MAX16024 provide battery-backup
functions. If a backup power source is not used, con-
nect BATT to GND.
Replacing the Backup Battery
When V
CC
is above V
TH
, the backup power source can
be removed without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
V
CC
stays above the reset threshold voltage.
Negative-Going V
CC
Transients
The MAX16023/MAX16024 are relatively immune to
short duration, negative-going V
CC
transients.
Resetting the µP when V
CC
experiences only small
glitches is usually not desirable. A 0.1µF bypass
capacitor mounted close to the V
CC
pin provides addi-
tional transient immunity.
Capacitor Selection and
Regulator Stability
For stable operation, connect a low-ESR 10µF (min) out-
put capacitor from OUT to GND. To reduce noise and
improve load-transient response and power-supply rejec-
tion, use larger output capacitor values.
Battery-Backup Circuits with
Regulated Output Voltage
14 ______________________________________________________________________________________
MAX16023
0.1µF
GND
PFI
PFO
R2
R1
R3
V
CC
V
H
=
(
V
PFT
+ V
PFI - HYS
)
x
(
+
+ 1
)
R1
R2
R1
R3
V
L
= R1 x
(
-
)
+ V
PFT
V
PFT
R2
V
CC
- V
PFT
R3
WHERE V
PFT
IS THE POWER-FAIL
THRESHOLD VOLTAGE.
*OPTIONAL
+5V
V
IN
C1*
TO µP
PFO
0
+5V
V
TRIP
V
L
V
H
V
IN
V
TRIP
= V
PFT
x
( )
R1 + R2
R2
Figure 5. Adding Hysteresis to the Power-Fail Comparator
Part Number Table
PART
OUTPUT
TYPE
R ESET
T H R ESH O L D
VO L T A G E
( V)
REGUL ATED
OU TPU T
VO LTA GE
( V)
PART
OUTPUT
TYPE
R ESET
T H R ESH O L D
VO L T A G E
( V)
R EG U L A T ED
O U T PU T
VO L T A G E
( V)
MAX16023LTAL12+T Push-Pull 4.63 1.2 MAX16024LTBL12+T Push-Pull 4.63 1.2
MAX16023LTAL18+T Push-Pull 4.63 1.8 MAX16024LTBL18+T Push-Pull 4.63 1.8
MAX16023LTAL25+T Push-Pull 4.63 2.5 MAX16024LTBL25+T Push-Pull 4.63 2.5
MAX16023LTAL33+T Push-Pull 4.63 3.3 MAX16024LTBL33+T Push-Pull 4.63 3.3
MAX16023LTAM12+T Push-Pull 4.38 1.2 MAX16024LTBM12+T Push-Pull 4.38 1.2
MAX16023LTAM18+T Push-Pull 4.38 1.8 MAX16024LTBM18+T Push-Pull 4.38 1.8
MAX16023LTAM25+T Push-Pull 4.38 2.5 MAX16024LTBM25+T Push-Pull 4.38 2.5
MAX16023LTAM33+T Push-Pull 4.38 3.3 MAX16024LTBM33+T Push-Pull 4.38 3.3
MAX16023LTAT12+T Push-Pull 3.08 1.2 MAX16024LTBT12+T Push-Pull 3.08 1.2
MAX16023LTAT18+T Push-Pull 3.08 1.8 MAX16024LTBT18+T Push-Pull 3.08 1.8
MAX16023LTAT25+T Push-Pull 3.08 2.5 MAX16024LTBT25+T Push-Pull 3.08 2.5
MAX16023LTAS12+T Push-Pull 2.93 1.2 MAX16024LTBS12+T Push-Pull 2.93 1.2
MAX16023LTAS18+T Push-Pull 2.93 1.8 MAX16024LTBS18+T Push-Pull 2.93 1.8
MAX16023LTAS25+T Push-Pull 2.93 2.5 MAX16024LTBS25+T Push-Pull 2.93 2.5
MAX16023LTAR12+T Push-Pull 2.63 1.2 MAX16024LTBR12+T Push-Pull 2.63 1.2
MAX16023LTAR18+T Push-Pull 2.63 1.8 MAX16024LTBR18+T Push-Pull 2.63 1.8
MAX16023LTAR25+T Push-Pull 2.63 2.5 MAX16024LTBR25+T Push-Pull 2.63 2.5
MAX16023LTAZ12+T Push-Pull 2.32 1.2 MAX16024LTBZ12+T Push-Pull 2.32 1.2
MAX16023/MAX16024
Battery-Backup Circuits with
Regulated Output Voltage
______________________________________________________________________________________ 15
Part Number Table (continued)
PART
OUTPUT
TYPE
R ESET
T H R ESH O L D
VO L T A G E
( V)
REGUL ATED
OU TPU T
VO LTA GE
( V)
PART
OUTPUT
TYPE
R ESET
T H R ESH O L D
VO L T A G E
( V)
R EG U L A T ED
O U T PU T
VO L T A G E
( V)
MAX16023LTAZ18+T Push-Pull 2.32 1.8 MAX16024LTBZ18+T Push-Pull 2.32 1.8
MAX16023LTAY12+T Push-Pull 2.19 1.2 MAX16024LTBY12+T Push-Pull 2.19 1.2
MAX16023LTAY18+T Push-Pull 2.19 1.8 MAX16024LTBY18+T Push-Pull 2.19 1.8
MAX16023LTAW12+T Push-Pull 1.67 1.2 MAX16024LTBW12+T Push-Pull 1.67 1.2
MAX16023LTAV12+T Push-Pull 1.575 1.2 MAX16024LTBV12+T Push-Pull 1.575 1.2
MAX16023PTAL12+T Open-Drain 4.63 1.2 MAX16024PTBL12+T Open-Drain 4.63 1.2
MAX16023PTAL18+T Open-Drain 4.63 1.8 MAX16024PTBL18+T Open-Drain 4.63 1.8
MAX16023PTAL25+T Open-Drain 4.63 2.5 MAX16024PTBL25+T Open-Drain 4.63 2.5
MAX16023PTAL33+T Open-Drain 4.63 3.3 MAX16024PTBL33+T Open-Drain 4.63 3.3
MAX16023PTAM12+T Open-Drain 4.38 1.2 MAX16024PTBM12+T Open-Drain 4.38 1.2
MAX16023PTAM18+T Open-Drain 4.38 1.8 MAX16024PTBM18+T Open-Drain 4.38 1.8
MAX16023PTAM25+T Open-Drain 4.38 2.5 MAX16024PTBM25+T Open-Drain 4.38 2.5
MAX16023PTAM33+T Open-Drain 4.38 3.3 MAX16024PTBM33+T Open-Drain 4.38 3.3
MAX16023PTAT12+T Open-Drain 3.08 1.2 MAX16024PTBS12+T Open-Drain 3.08 1.2
MAX16023PTAT18+T Open-Drain 3.08 1.8 MAX16024PTBS18+T Open-Drain 3.08 1.8
MAX16023PTAT25+T Open-Drain 3.08 2.5 MAX16024PTBS25+T O p e n - D r a i n 3.08 2.5
MAX16023PTAS12+T Open-Drain 2.93 1.2 MAX16024PTBT12+T Open-Drain 2.93 1.2
MAX16023PTAS18+T Open-Drain 2.93 1.8 MAX16024PTBT18+T Open-Drain 2.93 1.8
MAX16023PTAS25+T Open-Drain 2.93 2.5 MAX16024PTBT25+T Open-Drain 2.93 2.5
MAX16023PTAR12+T Open-Drain 2.63 1.2 MAX16024PTBR12+T Open-Drain 2.63 1.2
MAX16023PTAR18+T Open-Drain 2.63 1.8 MAX16024PTBR18+T Open-Drain 2.63 1.8
MAX16023PTAR25+T Open-Drain 2.63 2.5 MAX16024PTBR25+T Open-Drain 2.63 2.5
MAX16023PTAZ12+T Open-Drain 2.32 1.2 MAX16024PTBZ12+T Open-Drain 2.32 1.2
MAX16023PTAZ18+T Open-Drain 2.32 1.8 MAX16024PTBZ18+T Open-Drain 2.32 1.8
MAX16023PTAY12+T Open-Drain 2.19 1.2 MAX16024PTBY12+T Open-Drain 2.19 1.2
MAX16023PTAY18+T Open-Drain 2.19 1.8 MAX16024PTBY18+T Open-Drain 2.19 1.8
MAX16023PTAW12+T Open-Drain 1.67 1.2 MAX16024PTBW12+T Open-Drain 1.67 1.2
MAX16023PTAV12+T Open-Drain 1.575 1.2 MAX16024PTBV12+T Open-Drain 1.575 1.2
MAX16024PTBL+T Open-Drain 4.63 Adjustable MAX16024LTBL+T Push-Pull 4.63 Adjustable
MAX16024PTBM+T Open-Drain 4.38 Adjustable MAX16024LTBM+T Push-Pull 4.38 Adjustable
MAX16024PTBT+T Open-Drain 3.08 Adjustable MAX16024LTBT+T Push-Pull 3.08 Adjustable
MAX16024PTBS+T Open-Drain 2.93 Adjustable MAX16024LTBS+T Push-Pull 2.93 Adjustable
MAX16024PTBR+T Open-Drain 2.63 Adjustable MAX16024LTBR+T Push-Pull 2.63 Adjustable
MAX16024PTBZ+T Open-Drain 2.32 Adjustable MAX16024LTBZ+T Push-Pull 2.32 Adjustable
MAX16024PTBY+T Open-Drain 2.19 Adjustable MAX16024LTBY+T Push-Pull 2.19 Adjustable
MAX16024PTBW+T Open-Drain 1.67 Adjustable MAX16024LTBW+T Push-Pull 1.67 Adjustable
MAX16024PTBV+T Open-Drain 1.575 Adjustable MAX16024LTBV+T Push-Pull 1.575 Adjustable
Bold parts denote standard versions. Samples are generally available on standard versions.
Contact factory for availability of nonstandard versions.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX16024LTBR+T

Mfr. #:
Buy MAX16024LTBR+T
Manufacturer:
Maxim Integrated
Description:
Battery Management Battery Backup Adj-Ep
Lifecycle:
New from this manufacturer.
Delivery:
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