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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