MAX5024TASA ,65V, low-quiescent-current, high-voltage linear regulator with mP reset and watchdog timerFeaturesThe MAX5023/MAX5024 high-voltage linear regulators Wide Operating Input Voltage Rangeopera ..
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MAX9208EAI+T ,10-Bit Bus LVDS DeserializersApplicationsMAX9206EAI/V+ -40°C to +85°C 28 SSOP 16 to 40Cellular Phone Base DSLAMsStationsMAX9208E ..
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MAX5023LASA-MAX5023MASA-MAX5023TASA-MAX5024LASA-MAX5024MASA-MAX5024TASA
65V, low-quiescent-current, high-voltage linear regulator with mP reset and watchdog timer
General DescriptionThe 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 HOLDinput
that allows for the implementation of a self-holding
circuit without requiring external components. Setting
HOLDlow after enabling the regulator, forces the regu-
lator to remain on even if EN is subsequently set low.
Releasing HOLDshuts 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 package.
ApplicationsAutomotiveFire/Smoke Alarms
IndustrialTelecom/Networking
Home Security
FeaturesWide Operating Input Voltage Range
+6.5V to +65VThermally Enhanced 8-Pin SO Package Dissipates
1.5WGuaranteed 150mA Output Current60µA No-Load Supply Current-60V Reverse-Battery ProtectionPreset +3.3V or +5.0V Output VoltageThermal and Short-Circuit ProtectionOperate Over -40°C to +125°C Temperature RangeIntegrated µP Reset CircuitWatchdog Timer with 1.6s Timeout Period
(MAX5023)Regulator Enable and Hold Inputs Implement
Self-Holding CircuitSET Input for Adjustable Output Voltage
(MAX5024)
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
Pin Configurations19-2619; Rev 0; 10/02
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
Note: These parts offer a choice of reset thresholds, resetthreshold tolerances, and regulator output voltages. From the
Selector Guide, insert the desired suffix letter into the blank to
complete the part number.
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +14V, IOUT = 1mA, CIN = 10µF, COUT = 15µF, VEN= +2.4V, HOLD= open, 10kΩfrom RESETto OUT, TA = -40°C to +125°C,
unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND................................................................-60V to +70V
EN to GND...................................................-0.3V to (VIN+ 0.3V)
HOLDto GND...........................................-0.3V to (VOUT+ 0.3V)
SET, WDI, OUT to GND.......................................-0.3V to +13.2V
RESETto GND (Open Drain)...............................-0.3V to +13.2V
Short-Circuit Duration.................................................Continuous
Maximum Current to Any Pin (Except IN, OUT)...............±20mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 19.2mW/°C above +70°C)..............1538mW
Thermal Resistance:
(θJA).............................................................................52°C/W
(θJC)...............................................................................2°C/W
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
ELECTRICAL CHARACTERISTICS (continued)(VIN= +14V, IOUT = 1mA, CIN = 10µF, COUT = 15µF, VEN= +2.4V, HOLD= open, 10kΩfrom RESETto OUT, TA = -40°C to +125°C,
Note 1:Limits at -40°C are guaranteed by characterization and not production tested.
Note 2:Dropout voltage is defined as VIN- VOUTwhen VOUTis 100mV below the value of VOUTfor VIN= VOUT+ 3V.
Note 3:VOUT = VSET(1 + R1 / R2) = 1.248V (1 + R1 / R2).
Note 4:RESETis guaranteed to be in the correct logic state for VOUT> +1V.
Note 5:Guaranteed by design, not production tested.
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
Typical Operating Characteristics(VIN= +14V, CIN= 10µF, COUT= 15µF, VEN= +2.4V, VOUT= +5V, SET = GND, TA= +25°C, unless otherwise specified.)
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
INPUT VOLTAGE STEP RESPONSEMAX5023 toc10
200µs/div
VOUT
1V/div
65V
6.5V
VIN
20V/div
STARTUP RESPONSEMAX5023 toc11
200µs/div
VOUT
1V/div
65V
VIN
50V/div
ENABLE STARTUP RESPONSE
(VIN = +14V)MAX5023 toc12
100µs/div
VEN
1V/div
VOUT
2V/div
ENABLE STARTUP RESPONSE (VIN = +14V)MAX5023 toc13
100µs/div
VEN
1V/div
VOUT
2V/div
ENABLE STARTUP RESPONSE (VIN = +65V)MAX5023 toc14
100µs/div
VEN
1V/div
VOUT
2V/div
ENABLE STARTUP RESPONSE (VIN = +65V)MAX5023 toc15
100µs/div
VEN
1V/div
VOUT
2V/div
ypical Operating Characteristics (continued)(VIN= +14V, CIN= 10µF, COUT= 15µF, VEN= +2.4V, VOUT= +5V, SET = GND, TA= +25°C, unless otherwise specified.)
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer54535657554852515860615980
GROUND-CURRENT DISTRIBUTION
(TA = +40°C)MAX5023toc18
IGND (µA)
NUMBER OF UNITS
ypical Operating Characteristics (continued)(VIN= +14V, CIN= 10µF, COUT= 15µF, VEN= +2.4V, VOUT= +5V, SET = GND, TA= +25°C, unless otherwise specified.)
Pin Description
Detailed DescriptionThe MAX5023/MAX5024 high-voltage linear regulators
include an integrated µP reset circuit and watchdog
timer/adjustable output voltage. The devices guarantee
150mA load drive and are available with preset output
voltages of +3.3V or +5V. The MAX5023 features a
watchdog timer (WDI) with a 1.6s timeout period. The
MAX5024 offers an adjustable output voltage using an
external resistive-divider network between SET and
OUT. The internal reset circuit monitors the regulator
output voltage and asserts a reset output when the reg-
ulator output falls below the µP supply tolerance. Other
features include reverse-voltage protection to -60V,
enable (EN) and hold (HOLD) regulator control inputs,
16µA (max) shutdown current, short-circuit protection,
and thermal shutdown.
RegulatorThe regulator accepts an input voltage range from
+6.5V to +65V. The MAX5023/MAX5024 offer fixed out-
put voltages of +3.3V and +5V. The MAX5024 also fea-
tures an adjustable output voltage that is implemented
with an external resistive-divider network connected
between OUT, SET, and GND (Figure 1). The MAX5024
automatically determines the feedback path depending
on the voltage at SET. Featured characteristics include
reverse-voltage protection to -60V and enable and hold
regulator control inputs. The Typical Operating Circuit
shows a self-holding configuration for the MAX5023.
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
Functional DiagramFigure1. Functional Diagram
