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.
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)
MAX5023/MAX5024
Ordering Information
PART
MAX5023_
ASA
MAX5024_
ASA
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
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.
Applications
Automotive
Industrial
Home Security
Fire/Smoke Alarms
Telecom/Networking
Pin Configurations
TOP VIEW
IN 1
EN 2
8
7
OUT
WDI
N.C.
HOLD
IN
1
8
7
OUT
SET
N.C.
HOLD
EN 2
MAX5023
GND
3
6
5
GND
3
RESET 4
RESET 4
MAX5024
6
5
SO-EP
SO-EP
________________________________________________________________
Maxim Integrated Products
1
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.
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
MAX5023/MAX5024
ABSOLUTE MAXIMUM RATINGS
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 (V
IN
≤
+14V)............................Continuous
Maximum Current to Any Pin (Except IN, OUT) ...............
±
20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO-EP (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
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 10µF, C
OUT
= 15µF, V
EN
= +2.4V,
HOLD
= open, 10kΩ from
RESET
to OUT, T
A
= -40°C to +125°C,
unless otherwise noted. Typical specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage Range
Reverse Input Current
Supply Current
Shutdown Supply Current
REGULATOR
Guaranteed Output Current
I
OUT
V
OUT
= +5V
SET = GND, I
OUT
= 1mA to 150mA,
5V version
Output Voltage
V
OUT
SET = GND, I
OUT
= 1mA to 150mA,
3.3V version
I
OUT
= 5mA, adjustable version (MAX5024)
Dropout Voltage
Startup Response Time
Line Regulation
Enable Voltage
Enable Input Current
HOLD
Voltage
HOLD
Release Voltage
HOLD
Pullup Current
SET Reference Voltage
SET Input Leakage Current
∆V
OUT
/
∆V
IN
V
EN
I
EN
V
IL
V
IH
I
HOLD
V
SET
I
SET
∆V
DO
I
LOAD
= 150mA, V
OUT
= +5V (Note 2)
Rising edge of V
IN
to V
OUT
, R
L
= 500Ω,
SET = GND
+8V
≤
V
IN
≤
+65V
+5V version
+3.3V version
-1
-0.5
2.4
0.4
0.5
4
0.4
V
OUT
-
0.4V
4
1.223
1.248
0.5
1.273
100
150
4.8
3.168
2.5
0.9
400
+1
0.5
5
3.3
5.2
3.432
11
1.5
V
µs
mV/V
V
µA
V
V
µA
V
nA
V
mA
SYMBOL
V
IN
I
REVERSE
I
Q
I
SHDN
V
IN
= -60V
Measured at GND
V
EN
≤
+0.4V
I
OUT
= 0mA
I
OUT
= 150mA
CONDITIONS
V
IN
must be at least 1.5V greater than V
OUT
MIN
6.5
0.1
58
2000
6
16
TYP
MAX
65
10
140
UNITS
V
µA
µA
µA
EN = high, regulator on
EN = low, regulator off
V
EN
= +2.4V
V
EN
= +14V
Regulator on, EN transition from high to low
EN = low, regulator shuts off
Internally connected to OUT
I
OUT
= 10mA
2
_______________________________________________________________________________________
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 10µF, C
OUT
= 15µF, V
EN
= +2.4V,
HOLD
= open, 10kΩ from
RESET
to OUT, T
A
= -40°C to +125°C,
unless otherwise noted. Typical specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
Load Regulation
Power-Supply Rejection Ratio
Short-Circuit Current
Thermal-Shutdown
Temperature
Thermal-Shutdown Hysteresis
RESET CIRCUIT
MAX502_L, SET = GND
MAX502_M, SET = GND
MAX502_T, SET = GND
Reset Threshold
V
TH
MAX502_S, SET = GND
MAX5024L/T, SET = Divider
(Figure 1) (Note 3)
MAX5024M/S, SET = Divider
(Figure 1) (Note 3)
Reset Timeout Period
V
OUT
to Reset Delay
t
RP
t
RD
V
OUT
falling
V
OUT
≥
+1.0V, I
SINK
= 50µA,
RESET
asserted
Open-Drain
RESET
Output
Voltage (Note 4)
V
OL
V
OUT
≥
+2.85V, I
SINK
= 1.2mA,
RESET
asserted
V
OUT
≥
+4.25V, I
SINK
= 3.2mA,
RESET
asserted
Open-Drain
RESET
Output-
Leakage Current
WATCHDOG FUNCTION
Watchdog Timeout Period
WDI Pulse Width
WDI Input Voltage
WDI Input Current
t
WD
t
WDI
V
IL
V
IH
I
WDI
WDI = GND
2.4
-1
+1
(Note 5)
1.12
50
0.4
1.6
2.08
s
ns
V
µA
I
LKG
RESET
not asserted, V
RESET
= +11V
140
4.50
4.25
2.970
2.805
4.625
4.375
3.052
2.887
0.925 x
V
OUT
0.875 x
V
OUT
200
5
0.3
0.3
0.4
1.0
µA
V
260
ms
µs
4.75
4.50
3.135
2.970
V
SYMBOL
∆V
OUT
/
∆I
OUT
PSRR
I
SC
T
J(SHDN)
∆T
J(SHDN)
CONDITIONS
I
OUT
= 1mA to 150mA
I
OUT
= 10mA, f = 100Hz, 500mV
P-P
,
V
OUT
= +5V
V
IN
= +8V
175
MIN
TYP
1
54
300
150
20
MAX
UNITS
mV/mA
dB
mA
°C
°C
MAX5023/MAX5024
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 V
IN
= 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.
_______________________________________________________________________________________
3
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
MAX5023/MAX5024
Typical Operating Characteristics
(V
IN
= +14V, C
IN
= 10µF, C
OUT
= 15µF, V
EN
= +2.4V, V
OUT
= +5V, SET = GND, T
A
= +25°C, unless otherwise specified.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX5023 toc01
NO-LOAD GROUND CURRENT
vs. TEMPERATURE
MAX5023 toc02
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX5023 toc03
5.5
5.0
4.5
4.0
3.0
2.5
2.0
1.5
1.0
0.5
0
I
OUT
= 0mA
3.5
V
OUT
(V)
100
90
80
70
I
GND
(µA)
60
50
40
30
20
10
0
V
IN
= +6.5V
V
IN
= +65V
20
17
I
SHDN
(µA)
V
IN
= +14V
14
11
8
5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0 5 10 15 20 25 30 35 40 45 50 55 60 65
V
IN
(V)
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX5023 toc04
GROUND CURRENT
vs. TEMPERATURE
MAX5023 toc05
OUTPUT VOLTAGE
vs. LOAD CURRENT AND TEMPERATURE
5.4
5.3
5.2
V
OUT
(V)
5.1
5.0
4.9
I
LOAD
= 100mA
I
LOAD
= 150mA
I
LOAD
= 50mA
MAX5023 toc06
5.25
5.20
5.15
5.10
2.25
2.00
1.75
1.50
I
GND
(mA)
1.25
1.00
0.75
0.50
0.25
I
LOAD
= 100mA
I
LOAD
= 150mA
5.5
V
OUT
(V)
5.05
5.00
4.95
4.90
4.85
4.80
4.75
TEMPERATURE (°C)
I
OUT
= 1mA
-40 -25 -10 5 20 35 50 65 80 95 110 125
4.8
4.7
I
LOAD
= 50mA
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4.6
4.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
DROPOUT VOLTAGE
vs. LOAD CURRENT
1.35
1.20
DROPOUT VOLTAGE (V)
1.05
0.90
0.75
0.60
0.45
0.30
0.15
0
10
30
50
70
90
110
130
150
I
LOAD
(mA)
V
OUT
= 5V
-70
-80
0.1
PSRR (dB)
-30
-40
-50
-60
MAX5023 toc07
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-10
-20
MAX5023 toc08
LOAD-TRANSIENT RESPONSE
MAX5023 toc09
1.50
0
V
OUT
100mV/div
I
OUT
100mA/div
C
OUT
= 15µF
I
OUT
= 10mA
1
10
FREQUENCY (kHz)
100
1000
200µs/div
4
_______________________________________________________________________________________
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
MAX5023/MAX5024
Typical Operating Characteristics (continued)
(V
IN
= +14V, C
IN
= 10µF, C
OUT
= 15µF, V
EN
= +2.4V, V
OUT
= +5V, SET = GND, T
A
= +25°C, unless otherwise specified.)
INPUT VOLTAGE STEP RESPONSE
MAX5023 toc10
STARTUP RESPONSE
MAX5023 toc11
ENABLE STARTUP RESPONSE
(V
IN
= +14V)
V
EN
1V/div
MAX5023 toc12
5V
V
OUT
1V/div
5V
V
EN
= V
IN
I
OUT
= 1mA
65V
V
IN
20V/div
6.5V
200µs/div
V
EN
= V
IN
I
OUT
= 1mA
V
OUT
1V/div
V
OUT
2V/div
0V
65V
V
IN
50V/div
0V
200µs/div
I
OUT
= 0mA
100µs/div
ENABLE STARTUP RESPONSE (V
IN
= +14V)
MAX5023 toc13
ENABLE STARTUP RESPONSE (V
IN
= +65V)
MAX5023 toc14
ENABLE STARTUP RESPONSE (V
IN
= +65V)
MAX5023 toc15
V
EN
1V/div
V
EN
1V/div
V
EN
1V/div
V
OUT
2V/div
V
OUT
2V/div
I
OUT
= 150mA
100µs/div
100µs/div
V
OUT
2V/div
I
OUT
= 0mA
100µs/div
I
OUT
= 150mA
SHUTDOWN RESPONSE
MAX5023 toc16
ENABLE AND HOLD TIMING
MAX5023 toc17
V
EN
1V/div
V
EN
5V/div
V
HOLD
5V/div
V
OUT
2V/div
V
OUT
5V/div
I
OUT
= 1mA
40ms/div
200ms/div
_______________________________________________________________________________________
5
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