Datasheet

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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 withstand 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 regula-

tor, 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 regulator 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

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)

Selector Guide and Typical Operating Circuit appear at end

of data sheet.

19-2619; Rev 3; 5/14

● 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.

*EP = Exposed Paddle.

PART TEMP RANGE PIN-PACKAGE

MAX5023_ ASA -40°C to +125°C 8 SO-EP*

MAX5024_ ASA -40°C to +125°C 8 SO-EP*

N.C.

HOLDRESET

OUT

WDIEN

GND

SO-EP

TOP VIEW

MAX5023

N.C.

HOLDRESET

OUT

SETEN

GND

SO-EP

MAX5024

MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear

Regulators with μP Reset and Watchdog Timer

Pin Congurations

Ordering Information

Summary of content (14 pages)

PAGE 1
MAX5023/MAX5024 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 withstand a -60V reverse-battery voltage at the input.
PAGE 2
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Absolute Maximum Ratings IN to GND................................................................-60V to +70V EN to GND..................................................-0.3V to (VIN + 0.3V) HOLD to GND......................................... -0.3V to (VOUT + 0.3V) SET, WDI, OUT to GND......................................-0.3V to +13.2V RESET to GND (Open Drain).............................-0.
PAGE 3
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, 10kΩ from RESET to OUT, TA = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C.
PAGE 4
MAX5023/MAX5024 PARAMETER 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer SYMBOL Open-Drain RESET Output Voltage (Note 4) CONDITIONS VOL Open-Drain RESET OutputLeakage Current ILKG MIN TYP MAX UNITS VOUT ≥ +1.0V, ISINK = 50µA, RESET asserted 0.3 VOUT ≥ +2.85V, ISINK = 1.2mA, RESET asserted 0.3 VOUT ≥ +4.25V, ISINK = 3.2mA, RESET asserted 0.4 RESET not asserted, VRESET = +11V 1.0 µA 2.
PAGE 5
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Typical Operating Characteristics (continued) (VIN = +14V, CIN = 10μF, COUT = 15μF, VEN = +2.4V, VOUT = +5V, SET = GND, TA = +25°C, unless otherwise specified.) 5.20 5.15 2.00 1.75 1.50 5.00 4.95 4.85 0.50 4.80 0.25 IOUT = 1mA -40 -25 -10 5 20 35 50 65 80 95 110 125 4.8 ILOAD = 100mA ILOAD = 150mA 4.7 4.6 ILOAD = 50mA -40 -25 -10 5 20 35 50 65 80 95 110 125 4.
PAGE 6
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Typical Operating Characteristics (continued) (VIN = +14V, CIN = 10μF, COUT = 15μF, VEN = +2.4V, VOUT = +5V, SET = GND, TA = +25°C, unless otherwise specified.) INPUT VOLTAGE STEP RESPONSE STARTUP RESPONSE MAX5023 toc10 5V VOUT 1V/div MAX5023 toc11 VEN = VIN IOUT = 1mA 5V ENABLE STARTUP RESPONSE (VIN = +14V) MAX5023 toc12 VEN 1V/div VOUT 1V/div 65V VIN 20V/div VEN = VIN IOUT = 1mA 6.
PAGE 7
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Typical Operating Characteristics (continued) (VIN = +14V, CIN = 10μF, COUT = 15μF, VEN = +2.4V, VOUT = +5V, SET = GND, TA = +25°C, unless otherwise specified.
PAGE 8
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Detailed Description tor control inputs, 16μA (max) shutdown current, shortcircuit protection, and thermal shutdown. The 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.
PAGE 9
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer BATT VIN BATT EN VOUT WHEN WATCHDOG IS HELD HIGH AND EN = HIGH WDI OV RESET OV VOUT OV POR NORMAL OPERATION WDI HELD HIGH NORMAL OPERATION WDI HELD LOW BATT VIN BATT EN VOUT WHEN WATCHDOG IS HELD LOW AND EN = HIGH WDI OV RESET OV VOUT OV POR Figure 2.
PAGE 10
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer EN and HOLD. Figure 3 shows the timing diagram for the enable and hold functions. Connecting HOLD to OUT or floating HOLD allows the EN input to act as a standard ON/OFF switch for the regulator output. Thermal Protection When the junction temperature exceeds TJ = +150°C, an internal thermal sensor signals the shutdown logic that turns off the pass transistor and allows the IC to cool.
PAGE 11
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Table 1. Truth Table for Regulator Output State ORDER 1 2 EN Low High HOLD X X OUT Off +6.5V TO +65V Comments 10µF Initial state. EN has 5MΩ internal resistor to ground. HOLD has internal current source to OUT. On Regulator output is active when EN is pulled high. 3 High Low On Hold is asserted forcing the regulator output on even if EN goes low.
PAGE 12
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Example 1: TA = +95°C 0.16 VIN = +14V VOUT = +5V DEVICE EXPOSED PAD SOLDERED TO 1IN2 COPPER ISLAND 0.14 VOUT = +5V Find the maximum allowable output current. First calculate package dissipation at the given temperature as follows: = 1.057 W Then determine the maximum output current: (1.057 W ) I= = OUT(MAX) (14 V)-(5V) TA = +70°C 0.10 IOUT(MAX) (A) = PD 1.538 W - (0.
PAGE 13
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Selector Guide Reset Threshold (VTH) Preset VOUT Part VOUT Reset Tolerance Watchdog Timer Adjustable Regulator Output 5V 3.3V 4.63V 4.38V 3.05V 2.89V VOUT 7.5% VOUT 12.
PAGE 14
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer Revision History REVISION NUMBER REVISION DATE 3 5/14 PAGES CHANGED DESCRIPTION No /V OPNs; removed automotive reference from Applications section 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.