MAX16023PTAS12+T Maxim Integrated Products, MAX16023PTAS12+T Datasheet - Page 13

• Manufacturer Part Number: MAX16023PTAS12+T
• Description: IC BATTERY BACKUP 1.2V 8TDFN-EP
• Manufacturer: Maxim Integrated Products

Specifications of MAX16023PTAS12+T

• Function: Back-Up Management
• Battery Type: All Battery Types
• Voltage - Supply: 1.53 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
each. Connect a 10µF low-ESR capacitor from OUT to
GND. All capacitors should be mounted as close as
possible to the device.
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
divider to the negative voltage to be monitored.
Figure 3. Monitoring an Additional Supply by Connecting PFO
to MR
R1
R2
V
2
CC
and BATT to GND with a 0.1µF capacitor
PFI
Monitoring an Additional Supply
Applications Information
CC
______________________________________________________________________________________
. Connect the bottom of the resistive
MAX16023L
GND
V
V
CC
1
RESET
ADDITIONAL SUPPLY RESET VOLTAGE
V
PFO
0.1µF
2(RESET)
MR
= V
PFT
x
RESET
(
R1 + R2
R2
µP
)
Battery-Backup Circuits with
Regulated Output Voltage
The power-fail comparators have a typical input hys-
teresis of V
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
falls to the desired trip point (V
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.
Figure 4. Monitoring a Negative Supply
5V
PFO
R1
R2
+5V
0
V-
PFI-HYS
PFI
. This is sufficient for most applica-
MAX16023
V
GND
V
TRIP
CC
Adding Hysteresis to PFI
PFO
0.1μF
TRIP
0
V
V
). Resistor R3 adds
TRIP
TRIP
= V
IS NEGATIVE
PFT
PFT
V-
-
R2
R1
when V
(
5 - V
PFT
)
13
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