MAX5023_05 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer

19-2619; Rev 2; 5/05
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP 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 60µA 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 (µP) 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 µP 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’s output through a resistive-divider network.
The MAX5023/MAX5024 operate over the automotive
temperature range (-40°C to +125°C) and are available
in a thermally enhanced, surface-mount 8-pin SO-EP
package.
Applications
Automotive
Fire/Smoke Alarms
Industrial
Telecom/Networking
Home Security
TOP VIEW
IN 1
EN 2
GND 3
RESET 4
MAX5023
8 OUT
7 WDI
6 N.C.
5 HOLD
Features
♦ Wide Operating Input Voltage Range
+6.5V to +65V
♦ Thermally Enhanced 8-Pin SO Package with
Exposed Pad Dissipates 1.5W
♦ Guaranteed 150mA Output Current
♦ 60µA No-Load Supply Current
♦ -60V Reverse-Battery Protection
♦ Preset +3.3V or +5.0V Output Voltage
♦ Thermal and Short-Circuit Protection
♦ Operate Over -40°C to +125°C Temperature Range
♦ Integrated µP Reset Circuit
♦ Watchdog Timer with 1.6s Timeout Period
(MAX5023)
♦ Regulator Enable and Hold Inputs Implement
Self-Holding Circuit
♦ SET Input for Adjustable Output Voltage
(MAX5024)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5023_ ASA
MAX5024_ ASA
-40°C to +125°C
-40°C to +125°C
8 SO-EP*
8 SO-EP*
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.
*EP = Exposed Paddle.
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Pin Configurations
IN 1
EN 2
GND 3
RESET 4
MAX5024
8 OUT
7 SET
6 N.C.
5 HOLD
SO-EP
SO-EP
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