MAXIM MAX5023, MAX5024 User Manual

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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 short­circuit protected and include thermal shutdown.

In addition to an enable input to turn on or off the regu­lator, 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 regu­lator’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.

Applications

Automotive Fire/Smoke Alarms

Industrial Telecom/Networking

Home Security

Features

♦ Wide Operating Input Voltage Range

+6.5V to +65V

♦ Thermally Enhanced 8-Pin SO Package 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)

MAX5023/MAX5024

65V, Low-Quiescent-Current, High-Voltage Linear

Regulators with µP Reset and Watchdog Timer

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

19-2619; Rev 0; 10/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Selector Guide and Typical Operating Circuit appear at end
of data sheet.

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.

PART TEMP RANGE PIN-PACKAGE

MAX5023

MAX5024

_ ASA -40°C to +125°C 8 SO

_ ASA -40°C to +125°C 8 SO

TOP VIEW

1

GND

IN

2

MAX5024

3

4

SO

1

IN

2

MAX5023

3

GND

4

SO

87OUT

WDIEN

N.C.

6

HOLDRESET

5

87OUT

SETEN

N.C.

6

HOLDRESET

5

MAX5023/MAX5024

65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +14V, I

OUT

= 1mA, C

IN

= 10µF, C

OUT

= 15µF, VEN= +2.4V, HOLD = open, 10kΩ from RESET to OUT, TA = -40°C to +125°C,

unless otherwise noted. Typical specifications are at T

A

= +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 (V

IN

+ 0.3V)

HOLD to GND...........................................-0.3V to (V

OUT

+ 0.3V)

SET, WDI, OUT to GND .......................................-0.3V to +13.2V

RESET to GND (Open Drain)...............................-0.3V to +13.2V

Short-Circuit Duration.................................................Continuous

Maximum Current to Any Pin (Except IN, OUT) ...............

±20mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 19.2mW/°C above +70°C)..............1538mW

Thermal Resistance:

(θ

JA

) .............................................................................52°C/W

(θ

JC

) ...............................................................................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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage Range V

Reverse Input Current I

Supply Current I

Shutdown Supply Current I

REGULATOR

Guaranteed Output Current I

Output Voltage V

Dropout Voltage ∆V

Startup Response Time

Line Regulation

Enable Voltage V

Enable Input Current I

HOLD Voltage V

HOLD Release Voltage V

HOLD Pullup Current I

SET Reference Voltage V

SET Input Leakage Current I

IN

REVERSEVIN

Q

SHDN

OUT

VIN must be at least 1.5V greater than V

M easur ed at G N D

VEN ≤ +0.4V 6 16 µA

V

SET = GND, I
5V version

OUT

SET = GND, I

3.3V version

I

OUT

I

DO

LOAD

Rising edge of V
SET = GND

∆V

/

OUT

∆V

EN

EN

IL

IH

HOLD

SET

SET

+8V ≤ VIN ≤ +65V

IN

EN = high, regulator on 2.4

EN = low, regulator off 0.4

VEN = +2.4V 0.5

VEN = +14V 4

Regulator on, EN transition from high to low 0.4 V

EN = low, regulator shuts off

Internally connected to OUT 4 µA

I

OUT

= -60V 0.1 10 µA

= +5V 150 mA

OUT

OUT

OUT

= 5mA, adjustable version (MAX5024) 2.5 11

= 150mA, V

= 10mA 1.223 1.248 1.273 V

OUT

I

= 0mA 58 140

OUT

= 150m A 2000

I

OU T

= 1mA to 150mA,

= 1mA to 150mA,

= +5V (Note 2) 0.9 1.5 V

OUT

IN

to V

, RL = 500Ω,

OUT

6.5 65 V

4.8 5 5.2

3.168 3.3 3.432

400 µs

+5V version -1 1

+3.3V version -0.5 0.5

V

-

OUT

0.4V

0.5 100 nA

µA

V

mV/V

V

µA

V

MAX5023/MAX5024

65V, Low-Quiescent-Current, High-Voltage Linear

Regulators with µP Reset and Watchdog Timer

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +14V, I

OUT

= 1mA, C

IN

= 10µF, C

OUT

= 15µF, VEN= +2.4V, HOLD = open, 10kΩ from RESET to OUT, TA = -40°C to +125°C,

unless otherwise noted. Typical specifications are at T

A

= +25°C.) (Note 1)

Note 1: Limits at -40°C are guaranteed by characterization and not production tested.
Note 2: Dropout voltage is defined as V

IN

- V

OUT

when V

OUT

is 100mV below the value of V

OUT

for VIN= V

OUT

+ 3V.

Note 3: V

OUT

= V

SET

(1 + R1 / R2) = 1.248V (1 + R1 / R2).

Note 4: RESET is guaranteed to be in the correct logic state for V

OUT

> +1V.

Note 5: Guaranteed by design, not production tested.

)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Load Regulation

Power-Supply Rejection Ratio PSRR

Short-Circuit Current I

Thermal-Shutdown
Temperature

Thermal-Shutdown Hysteresis ∆T

RESET CIRCUIT

Reset Threshold V

Reset Timeout Period t

V

to Reset Delay t

OUT

Open-Drain RESET Output
Voltage (Note 4)

Open-Drain RESET Output­Leakage Current

WATCHDOG FUNCTION

Watchdog Timeout Period t

WDI Pulse Width t

WDI Input Voltage

WDI Input Current I

∆V

∆I

T

J(SHDN

J(SHDN

RD

V

I

LKG

WD

WDI

V

V

WDI

OUT

OUT

SC

/

I

I
V

VIN = +8V 175 300 mA

= 1mA to 150mA 1 mV/mA

OUT

= 10mA, f = 100Hz, 500mV

OUT

= +5V

OUT

MAX502_L, SET = GND 4.50 4.625 4.75

MAX502_M, SET = GND 4.25 4.375 4.50

MAX502_T, SET = GND 2.970 3.052 3.135

TH

MAX502_S, SET = GND 2.805 2.887 2.970

MAX5024L/T, SET = Divider
(Figure 1) (Note 3)

MAX5024M/S, SET = Divider
(Figure 1) (Note 3)

RP

V

falling 5 µs

OUT

V

≥ +1.0V, I

OUT

SINK

= 50µA,

RESET asserted

OL

OUT

RESET asserted

V

≥ +4.25V, I

OUT

SINK

SINK

V

≥ +2.85V, I

RESET asserted

RESET not asserted, V

(Note 5) 50 ns

IL

IH

WDI = GND -1 +1 µA

,

P-P

54 dB

150 °C

20 °C

0.925 x
V

OUT

0.875 x
V

OUT

140 200 260 ms

= 1.2mA,

= 3.2mA,

= +11V 1.0 µA

RESET

1.12 1.6 2.08 s

2.4

0.3

0.3

0.4

0.4

V

V

V

MAX5023/MAX5024

65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VIN= +14V, CIN= 10µF, C

OUT

= 15µF, VEN= +2.4V, V

OUT

= +5V, SET = GND, TA= +25°C, unless otherwise specified.)

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX5023 toc01

VIN (V)

V

OUT

(V)

605545 5015 20 25 30 35 405 10

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

0

065

I

OUT

= 0mA

NO-LOAD GROUND CURRENT

vs. TEMPERATURE

MAX5023 toc02

TEMPERATURE (°C)

I

GND

(µA)

1109565 80-10 5 20 35 50-25

10

20

30

40

50

60

70

80

90

100

0

-40 125

VIN = +6.5V

VIN = +14V

VIN = +65V

8

11

14

17

20

5

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX5023 toc03

TEMPERATURE (°C)

I

SHDN

(µA)

1109565 80-10 5 20 35 50-25-40 125

4.80

4.85

4.90

4.95

5.00

5.05

5.10

5.15

5.20

5.25

4.75

OUTPUT VOLTAGE

vs. TEMPERATURE

MAX5023 toc04

TEMPERATURE (°C)

V

OUT

(V)

1109565 80-10 5 20 35 50-25-40 125

I

OUT

= 1mA

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

0

GROUND CURRENT

vs. TEMPERATURE

MAX5023 toc05

TEMPERATURE (°C)

I

GND

(mA)

1109565 80-10 5 20 35 50-25-40 125

I

LOAD

= 50mA

I

LOAD

= 150mA

I

LOAD

= 100mA

V

OUT

(V)

4.6

4.7

4.8

4.9

5.0

5.1

5.2

5.3

5.4

5.5

4.5

OUTPUT VOLTAGE

vs. LOAD CURRENT AND TEMPERATURE

MAX5023 toc06

TEMPERATURE (°C)

1109565 80-10 5 20 35 50-25-40 125

I

LOAD

= 50mA

I

LOAD

= 150mA

I

LOAD

= 100mA

DROPOUT VOLTAGE
vs. LOAD CURRENT

MAX5023 toc07

I

LOAD

(mA)

DROPOUT VOLTAGE (V)

13011070 905030

0.15

0.30

0.45

0.60

0.75

0.90

1.05

1.20

1.35

1.50

0

10 150

V

OUT

= 5V

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX5023 toc08

FREQUENCY (kHz)

PSRR (dB)

100101

-70

-60

-50

-40

-30

-20

-10

0

-80

0.1 1000

C

OUT

= 15µF

I

OUT

= 10mA

LOAD-TRANSIENT RESPONSE

MAX5023 toc09

200µs/div

V

OUT

100mV/div

I

OUT

100mA/div