19-2619; Rev 0; 10/02
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with 碌P Reset and Watchdog Timer
General Description
The MAX5023/MAX5024 high-voltage linear regulators
operate from a +6.5V to +65V input voltage and deliver
up to 150mA of output current. These devices consume
only 60碌A of quiescent current with no load and with-
stand a -60V reverse-battery voltage at the input. The
MAX5023/MAX5024 include an active-low internal
microprocessor (碌P) reset circuit that asserts when the
regulator output drops below the preset output voltage
threshold by 7.5% or 12.5%, depending on the device
selected. Both devices are available with a fixed +3.3V
or +5V output. These devices are short-
circuit protected and include thermal shutdown.
In addition to an enable input to turn on or off the regu-
lator, the MAX5023/MAX5024 include a
HOLD
input
that allows for the implementation of a self-holding
circuit without requiring external components. Setting
HOLD
low after enabling the regulator, forces the regu-
lator to remain on even if EN is subsequently set low.
Releasing
HOLD
shuts down the regulator.
The MAX5023 includes a watchdog input that monitors a
pulse train from the 碌P and generates reset pulses if the
watchdog input remains high or low for a duration longer
than the 1.6s watchdog timeout period. The MAX5024
includes a SET input which, when connected to ground,
selects a preset output voltage of +3.3V (MAX5024S/
MAX5024T) or +5V (MAX5024L/MAX5024M). Set the
adjustable output voltage by connecting SET to the regu-
lator鈥檚 output through a resistive-divider network.
The MAX5023/MAX5024 operate over the automotive
temperature range (-40掳C to +125掳C) and are available in
a thermally enhanced, surface-mount 8-pin SO package.
Features
o
Wide Operating Input Voltage Range
+6.5V to +65V
o
Thermally Enhanced 8-Pin SO Package Dissipates
1.5W
o
Guaranteed 150mA Output Current
o
60碌A No-Load Supply Current
o
-60V Reverse-Battery Protection
o
Preset +3.3V or +5.0V Output Voltage
o
Thermal and Short-Circuit Protection
o
Operate Over -40掳C to +125掳C Temperature Range
o
Integrated 碌P Reset Circuit
o
Watchdog Timer with 1.6s Timeout Period
(MAX5023)
o
Regulator Enable and Hold Inputs Implement
Self-Holding Circuit
o
SET Input for Adjustable Output Voltage
(MAX5024)
MAX5023/MAX5024
Ordering Information
PART
MAX5023
_ ASA
MAX5024
_ ASA
TEMP RANGE
-40掳C to +125掳C
-40掳C to +125掳C
PIN-PACKAGE
8 SO
8 SO
Applications
Automotive
Industrial
Home Security
Fire/Smoke Alarms
Telecom/Networking
Note:
These parts offer a choice of reset thresholds, reset
threshold tolerances, and regulator output voltages. From the
Selector Guide, insert the desired suffix letter into the blank to
complete the part number.
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Pin Configurations
TOP VIEW
IN
EN
GND
1
2
8
7
OUT
WDI
N.C.
HOLD
IN 1
EN 2
8
7
OUT
SET
N.C.
HOLD
MAX5023
3
6
5
GND
3
RESET 4
RESET 4
MAX5024
6
5
SO
SO
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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