MAX5024MASA [MAXIM]
Fixed/Adjustable Positive LDO Regulator, 2.5V Min, 11V Max, 1.5V Dropout, BICMOS, PDSO8, SO-8;
| 型号： | MAX5024MASA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fixed/Adjustable Positive LDO Regulator, 2.5V Min, 11V Max, 1.5V Dropout, BICMOS, PDSO8, SO-8 信息通信管理 光电二极管 输出元件 调节器 |
| 文件： | 总15页 (文件大小：942K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
General Description
Features
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.
● 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
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.
● Watchdog Timer with 1.6s Timeout Period
(MAX5023)
● Regulator Enable and Hold Inputs Implement Self-
Holding Circuit
● SET Input for Adjustable Output Voltage (MAX5024)
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.
Selector Guide and Ordering Information appear at end of
data sheet.
Typical Operating Circuit
+6.5V TO +65V
V
CC
IN
OUT
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.
10µF
15µF
µP
MAX5023
10kΩ
Applications
● Automotive
RESET
WDI
RESET
I/O
ON
OFF
EN
● Industrial
● Home Security
● Fire/Smoke Alarms
● Telecom/Networking
I/O
HOLD
GND
19-2619; Rev 8; 3/16
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
Continuous Power Dissipation (T = +70°C)
A
EN to GND .................................................-0.3V to (V + 0.3V)
8-Pin SO-EP (derate 19.2mW/°C above +70°C).......1538mW
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
IN
HOLD to GND ........................................-0.3V to (V
+ 0.3V)
OUT
SET, WDI, OUT to GND.....................................-0.3V to +13.2V
RESET to GND (Open Drain) ............................-0.3V to +13.2V
Short-Circuit Duration (V ≤ +14V)..........................Continuous
IN
Maximum Current to Any Pin (Except IN, OUT) ..............±20mA
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.
(Note 1)
Package Thermal Characteristics
SO-EP
Junction-to-Ambient Thermal Resistance (θ )...........41°C/W
JA
Junction-to-Case Thermal Resistance (θ )..................2°C/W
JC
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V = +14V, I
= 1mA, C = 10μF, C
= 15μF, V
= +2.4V, HOLD = open, 10kΩ from RESET to OUT, T = -40°C to +125°C,
EN A
IN
OUT
IN
OUT
unless otherwise noted. Typical specifications are at T = +25°C.) (Note 2)
A
PARAMETER
Input Voltage Range
Reverse Input Current
SYMBOL
CONDITIONS
must be at least 1.5V greater than V
= -60V
MIN
TYP
MAX
65
UNITS
V
V
V
V
6.5
IN
IN
OUT
I
0.1
58
10
µA
REVERSE
IN
I
= 0mA
140
OUT
Supply Current
I
Measured at GND
µA
µA
Q
I
= 150mA
2000
6
OUT
Shutdown Supply Current
REGULATOR
I
V
≤ +0.4V
16
SHDN
EN
Guaranteed Output Current
I
V
= +5V
150
4.8
mA
V
OUT
OUT
SET = GND, I
5V version
= 1mA to 150mA,
= 1mA to 150mA,
OUT
5
5.2
Output Voltage
V
SET = GND, I
3.3V version
OUT
OUT
3.168
2.5
3.3
3.432
I
I
= 5mA, adjustable version (MAX5024)
11
OUT
Dropout Voltage
ΔV
= 150mA, V = +5V (Note 3)
OUT
0.9
1.5
V
DO
LOAD
Rising edge of V to V
SET = GND
, R = 500Ω,
L
IN
OUT
Startup Response Time
400
µs
+5V version
-1
+1
ΔV
ΔV
/
OUT
Line Regulation
+8V ≤ V ≤ +65V
IN
mV/V
IN
+3.3V version
-0.5
0.5
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Electrical Characteristics (continued)
(V = +14V, I
= 1mA, C = 10μF, C
= 15μF, V
= +2.4V, HOLD = open, 10kΩ from RESET to OUT, T = -40°C to +125°C,
IN
OUT
IN
OUT
EN A
unless otherwise noted. Typical specifications are at T = +25°C.) (Note 2)
A
PARAMETER
Enable Voltage
SYMBOL
CONDITIONS
EN = high, regulator on
EN = low, regulator off
MIN
TYP
MAX
UNITS
2.4
V
V
EN
0.4
V
V
= +2.4V
= +14V
0.5
4
EN
Enable Input Current
I
µA
EN
EN
V
V
Regulator on, EN transition from high to low
EN = low, regulator shuts off
0.4
V
V
HOLD Voltage
IL
V
- 0.4V
HOLD Release Voltage
HOLD Pullup Current
SET Reference Voltage
SET Input Leakage Current
IH
OUT
Internally connected to OUT
4
µA
V
I
HOLD
V
I
= 10mA
1.223
1.248
0.5
1.273
SET
SET
OUT
I
100
nA
ΔV
ΔI
/
OUT
OUT
Load Regulation
I
I
= 1mA to 150mA
1
mV/mA
OUT
= 10mA, f = 100Hz, 500mV
,
OUT
P-P
Power-Supply Rejection Ratio
Short-Circuit Current
PSRR
54
dB
mA
°C
V
= +5V
OUT
I
V
= +8V
IN
175
300
150
SC
Thermal-Shutdown
Temperature
T
J(SHDN)
Thermal-Shutdown Hysteresis ΔT
20
°C
J(SHDN)
RESET CIRCUIT
MAX502_L, SET = GND
MAX502_M, SET = GND
MAX502_T, SET = GND
MAX502_S, SET = GND
4.50
4.25
4.625
4.375
3.052
2.887
4.75
4.50
2.970
2.805
3.135
2.970
Reset Threshold
V
V
TH
MAX5024L/T, SET = Divider
(Figure 1) (Note 4)
0.925 x V
0.875 x V
OUT
MAX5024M/S, SET = Divider
(Figure 1) (Note 4)
OUT
Reset Timeout Period
t
140
200
5
260
ms
µs
RP
V
to Reset Delay
t
V
falling
OUT
RD
OUT
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Electrical Characteristics (continued)
(V = +14V, I
= 1mA, C = 10μF, C
= 15μF, V
= +2.4V, HOLD = open, 10kΩ from RESET to OUT, T = -40°C to +125°C,
EN A
IN
OUT
IN
OUT
unless otherwise noted. Typical specifications are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
≥ +1.0V, I
= 50µA,
OUT
SINK
0.3
RESET asserted
V
≥ +2.85V, I
= 1.2mA,
SINK
Open-Drain RESET Output
Voltage (Note 5)
OUT
RESET asserted
V
0.3
0.4
1.0
V
OL
V
≥ +4.25V, I
= 3.2mA,
OUT
RESET asserted
SINK
Open-Drain RESET Output-
Leakage Current
I
µA
RESET not asserted, V
= +11V
LKG
RESET
WATCHDOG FUNCTION
Watchdog Timeout Period
WDI Pulse Width
t
1.12
1.6
50
2.08
0.4
s
WD
t
(Note 6)
ns
WDI
V
IL
WDI Input Voltage
WDI Input Current
V
V
2.4
-1
IH
I
WDI = GND
+1
µA
WDI
Note 2: Limits at -40°C are guaranteed by characterization and not production tested.
Note 3: Dropout voltage is defined as V - V when V is 100mV below the value of V
for V = V + 3V.
OUT
IN
OUT
OUT
OUT
IN
Note 4: V
= V
(1 + R1/R2) = 1.248V (1 + R1/R2).
OUT
SET
Note 5: RESET is guaranteed to be in the correct logic state for V
Note 6: Guaranteed by design, not production tested.
> +1V.
OUT
Typical Operating Characteristics
(V = +14V, C = 10μF, C
= 15μF, V
= +2.4V, V
= +5V, SET = GND, T = +25°C, unless otherwise specified.)
IN
IN
OUT
EN
OUT A
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
NO-LOAD GROUND CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
90
80
70
60
50
40
30
20
10
0
20
17
14
11
8
V
= +65V
IN
V
= +14V
= +6.5V
IN
IN
V
I
= 0mA
OUT
5
0
5
10 15 20 25 30 35 40 45 50 55 60 65
(V)
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
V
IN
TEMPERATURE (°C)
TEMPERATURE (°C)
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Typical Operating Characteristics (continued)
(V = +14V, C = 10μF, C
= 15μF, V
= +2.4V, V
= +5V, SET = GND, T = +25°C, unless otherwise specified.)
IN
IN
OUT
EN
OUT A
OUTPUT VOLTAGE
vs. TEMPERATURE
GROUND CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. LOAD CURRENT AND TEMPERATURE
5.25
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
I
= 50mA
I
= 150mA
= 100mA
LOAD
LOAD
I
= 100mA
LOAD
I
= 150mA
LOAD
I
LOAD
I
= 50mA
LOAD
I
= 1mA
OUT
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
LOAD-TRANSIENT RESPONSE
MAX5023 toc09
1.50
1.35
1.20
1.05
0.90
0.75
0.60
0.45
0.30
0.15
0
0
-10
-20
-30
-40
-50
-60
-70
-80
V
OUT
100mV/div
I
OUT
100mA/div
C
I
= 15µF
= 10mA
OUT
OUT
V
= 5V
OUT
200µs/div
10
30
50
70
90 110 130 150
(mA)
0.1
1
10
100
1000
I
FREQUENCY (kHz)
LOAD
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Typical Operating Characteristics (continued)
(V = +14V, C = 10μF, C
= 15μF, V
= +2.4V, V
= +5V, SET = GND, T = +25°C, unless otherwise specified.)
IN
IN
OUT
EN
OUT A
ENABLE STARTUP RESPONSE
INPUT VOLTAGE STEP RESPONSE
STARTUP RESPONSE
(V = +14V)
IN
MAX5023 toc10
MAX5023 toc11
MAX5023 toc12
V
I
= V
= 1mA
EN
IN
5V
OUT
1V/div
5V
V
OUT
EN
V
1V/div
V
OUT
1V/div
65V
V
OUT
V
IN
2V/div
0V
20V/div
65V
V
= V
IN
= 1mA
V
IN
EN
I
= 0mA
I
OUT
50V/div
0V
6.5V
OUT
200µs/div
200µs/div
100µs/div
ENABLE STARTUP RESPONSE (V = +14V)
ENABLE STARTUP RESPONSE (V = +65V)
ENABLE STARTUP RESPONSE (V = +65V)
IN
MAX5023 toc15
IN
IN
MAX5023 toc13
MAX5023 toc14
V
EN
V
V
EN
EN
1V/div
1V/div
1V/div
V
OUT
V
OUT
V
OUT
2V/div
2V/div
2V/div
I
= 150mA
I
= 0mA
I
= 150mA
OUT
OUT
OUT
100µs/div
100µs/div
100µs/div
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Typical Operating Characteristics (continued)
(V = +14V, C = 10μF, C
= 15μF, V
= +2.4V, V
= +5V, SET = GND, T = +25°C, unless otherwise specified.)
IN
IN
OUT
EN
OUT
A
ENABLE AND HOLD TIMING
SHUTDOWN RESPONSE
MAX5023 toc17
MAX5023 toc16
V
EN
1V/div
V
EN
5V/div
V
HOLD
5V/div
V
OUT
2V/div
V
OUT
5V/div
I
= 1mA
OUT
200ms/div
40ms/div
GROUND-CURRENT DISTRIBUTION
GROUND-CURRENT DISTRIBUTION
(T = +40°C)
A
(T = +125°C)
A
30
25
20
15
10
5
30
25
20
15
10
5
0
0
47 48 51 52 53 54 55 56 57 58 59 60 61 80
45 53 56 57 58 59 60 61 62 63 64 65 89
I
(µA)
I
(µA)
GND
GND
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Pin Configurations
TOP VIEW
IN
EN
1
2
3
4
8
7
6
5
OUT
WDI
IN
EN
1
2
3
4
8
7
6
5
OUT
SET
MAX5023
SO-EP
MAX5024
SO-EP
GND
N.C.
GND
N.C.
RESET
HOLD
RESET
HOLD
Pin Description
PIN
NAME
FUNCTION
MAX5023 MAX5024
Regulator Input. Supply voltage ranges from +6.5V to +65V. Bypass with a 10µF capacitor to
GND.
1
2
3
4
1
2
3
4
IN
EN
Enable Input. Force EN high to turn on the regulator. Pull EN low and force HOLD high (or
open circuit) to place the device in shutdown mode. Internally connected to ground through a
5MΩ resistor.
Ground. GND also functions as a heatsink. Solder to large pads or the circuit-board ground
plane to maximize thermal dissipation.
GND
RESET
Active-Low Open-Drain Reset Output. RESET remains low while V
is below the reset
OUT
threshold or when WDI is not pulsed within 1.6s. RESET remains low for the duration of the
reset timeout period after the reset conditions are terminated.
Regulator Hold Input. When HOLD is forced low, the regulator stores the on state of the
output allowing the regulator to function even if EN is pulled low. To shutdown the regulator,
release HOLD after EN is pulled low. If HOLD is unused, either float HOLD or connect to OUT.
Internally connected to OUT through a 4µA pullup current source (see Table 1, Truth Table).
5
5
HOLD
6
6
N.C.
No Connection. Not internally connected.
Watchdog Timer Input (MAX5023 only). The watchdog timer asserts a reset if WDI does not
transition within the 1.6s watchdog timeout period. WDI cannot be disabled.
7
—
WDI
Regulator Output. Fixed (+3.3V or +5V) or adjustable (+2.5V to +11V). Bypass with a 15µF
capacitor (min).
8
8
OUT
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage
to the preset fixed value (+3.3V or +5V). Connect to an external resistor-divider network for
adjustable output operation (MAX5024 only).
—
—
7
SET
EP
—
Exposed Pad. Connect pad to GND.
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
tor control inputs, 16μA (max) shutdown current, short-
circuit protection, and thermal shutdown.
Detailed Description
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. 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 regulator output falls below the μP
supply tolerance. Other features include reverse-voltage
protection to -60V, enable (EN) and hold (HOLD) regula-
Regulator
The regulator accepts an input voltage range from +6.5V
to +65V. The MAX5023/MAX5024 offer fixed output volt-
ages of +3.3V and +5V. The MAX5024 also features an
adjustable output voltage that is implemented with an
external resistive-divider network connected between
OUT, SET, and GND (Figure 1). The MAX5024 auto-
matically 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.
Functional Diagram
IN
+6.5V to +65V
OUT
REVERSE BATTERY PROTECTION
4µA
HOLD
EN
CONTROL
LOGIC
BANDGAP
REFERENCE
AMP
MUX
+2.5V to +11V
OUT
THERMAL
SENSOR
R1
COMP
SET
R2
CURRENT
SENSOR AND
REGULATOR
(MAX5024 ONLY)
TO INTERNAL SHUTDOWN
CIRCUITRY
RESET
200ms
TIMEOUT
PERIOD
WATCHDOG
TIMER AND
LOGIC
WDI*
GND
*MAX5023 ONLY.
Figure 1. Functional Diagram
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
BATT
BATT
V
IN
EN
V
WHEN WATCHDOG IS HELD
OV
OV
OV
WDI
OUT
HIGH AND EN = HIGH
RESET
V
OUT
POR
NORMAL OPERATION
WDI HELD HIGH
BATT
BATT
V
IN
EN
V
WHEN WATCHDOG IS HELD
OUT
OV
OV
WDI
LOW AND EN = HIGH
RESET
OV
V
OUT
POR
NORMAL OPERATION
WDI HELD LOW
Figure 2. Watchdog Operation Timing Diagram
Watchdog Operation Timing Diagram. To prevent the
Reset Output
watchdog from asserting RESET, toggle WDI with a
The reset supervisor circuit is fully integrated in the
MAX5023/MAX5024 and uses the same reference volt-
age as the regulator. RESET asserts during power-up/
down and brownout conditions. RESET goes low if V
drops below the preset output voltage threshold, and
valid rising or falling edge prior to t
(min) = 1.12s. The
WD
watchdog counter clears when WDI toggles prior to t
WD
or when RESET asserts. The watchdog resumes counting
after RESET deasserts.
OUT
remains low for 200ms (reset timeout period, t ) after
RP
Enable and Hold Inputs
V
rises above the reset voltage threshold. For the
OUT
The MAX5023/MAX5024 support two logic inputs, EN
(active high) and HOLD (active low), making these devic-
es “automotive friendly.” For example, the ignition drives
EN high, the regulator turns on and remains on even if EN
goes low, as long as HOLD is forced low and stays low
after initial regulator power-up. This feature makes it pos-
sible to implement a self-holding circuit without external
components. Release HOLD (an internal current source
connects HOLD to OUT) to turn the regulator off.
MAX5023 only, RESET also asserts when WDI does not
transition for 1.6s (watchdog timeout period, t ). Two
WD
supply tolerance reset thresholds, -7.5% and -12.5%, are
available for each device type.
Watchdog Timer (MAX5023 only)
A watchdog timer asserts RESET if the watchdog input
(WDI) is not toggled for 1.6s (watchdog timeout period,
t
). RESET remains low for 200ms (reset timeout
WD
period, t ). If the watchdog is not updated for lengthy
Force EN low and HOLD high to place the MAX5023/
MAX5024 into shutdown mode. Shutdown mode draws
less than 16μA of supply current. Table 1 shows the state
of the regulator output with respect to the voltage level at
RP
periods of time, the reset output appears as a pulse
train, asserted for 200ms, deasserted for 1.6s, until WDI
is toggled again. Once RESET asserts, it stays low for
the entire reset timeout period ignoring any WDI transi-
tion during the reset timeout period. Figure 2 shows the
Maxim Integrated
│ 10
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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.
MAX5024 in the event of fault conditions. For continuous
operation, do not exceed the absolute maximum junction
temperature rating of T = +150°C.
J
Applications Information
Thermal Protection
Output-Voltage Selection (MAX5024 only)
When the junction temperature exceeds T = +150°C, an
J
The MAX5024 features Dual Mode™ operation; it oper-
ates in either a preset voltage mode or an adjustable
mode. In preset voltage mode, internal trimmed feedback
resistors set the MAX5024’s internal linear regulator to
+3.3V or +5V (see the Selector Guide).
internal thermal sensor signals the shutdown logic that
turns off the pass transistor and allows the IC to cool.
The thermal sensor turns the pass transistor on again
after the IC’s junction temperature cools by 20°C, result-
ing in a cycled output during continuous thermal-overload
conditions. Thermal protection protects the MAX5023/
V
IN
V
EN
V
EN, ON
5)
1)
V
EN, OFF
>10µs
>10µs
V
HOLD
V
HOLD, REL
6)
2)
4)
V
HOLD, HOLD
7)
V
OUT
V
V
TH
OUT (NOM)
8)
200ms
V
RESET
9)
3)
0.2V
1) ENABLE ACTIVE
2) HOLD INACTIVE, PULLED UP BY V
3) POWER-ON RESET
6) PULSE WIDTH SMALLER THAN 10µs
7) HOLD INACTIVE, RELEASED BY µP
8) REGULATOR OUTPUT SHUTDOWN
9) OUTPUT-LOW RESET
OUT
4) HOLD ACTIVE, CLAMPED TO GND BY EXTERNAL µP
5) ENABLE INACTIVE, CLAMPED BY INT, PULLDOWN RESISTOR
Figure 3. Enable and Hold Behavior
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Maxim Integrated
│ 11
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Table 1. Truth Table for Regulator Output
State
+6.5V TO +65V
10µF
+2.5V TO +11V
15µF
IN
OUT
ORDER EN
OUT
Comments
HOLD
MAX5024
Initial state. EN has 5MΩ
internal resistor to ground.
HOLD has internal current
source to OUT.
HOLD
1
Low
X
Off
ON
R1
R2
OFF
EN
Regulator output is active
when EN is pulled high.
SET
2
3
High
X
On
TO µP
RESET
Hold is asserted forcing the
On regulator output on even if
High Low
GND
EN goes low.
Self-holding state. Regulator
On output stays on regardless of
the state of EN.
V
V
= V
= 1.248V
(1 + R1 / R2)
SET
OUT
4
5
X
Low
SET
R2 = 1kΩ TO 500kΩ
Regulator output is shutdown
Off by releasing HOLD while EN
remains low.
Low High
Figure 4. Setting the MAX5024 Adjustable Output Voltage
X = Don’t care.
Select preset voltage mode by connecting SET to ground.
In adjustable mode, select an output between +2.5V and
+11V using two external resistors connected as a voltage-
divider to SET (Figure 4). Set the output voltage using the
following equation:
2.0
1.8
1.6
1.538W
1.4
DERATE
19.23mW/°C
1.2
1.0
0.8
0.6
0.4
0.2
V
= V
(1 + R1/R2)
OUT
SET
where V
= 1.248V and R2 ≈ 100kΩ.
SET
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Available Output-Current Calculation
T
(°C)
A
The MAX5023/MAX5024 high-voltage regulator provides
up to 150mA of output current. The input voltage extends
to +65V. Package power dissipation limits the amount of
output current available for a given input/output voltage
and ambient temperature. Figure 5 depicts the maximum
power dissipation curve for these devices. The graph
assumes that the exposed metal pad of the MAX5023/
Figure 5. Maximum Power Dissipation vs. Temperature
After determining the allowable package dissipation,
calculate the maximum output current using the following
formula:
2
MAX5024 package is soldered to 1in of PCB copper.
P
D
Use Figure 5 to determine the allowable package
dissipation for a given ambient temperature. Alternately,
use the following formula to calculate the allowable
package dissipation:
I
≅
≤ 150mA
OUT MAX
(
)
V
-V
IN OUT
The above equations do not include the negligible power
dissipation from self-heating due to the IC ground current.
1.538W for T ≤ +70°C
A
P
=
D
1.538 - 0.01923 T - 70°C for + 70°C < T ≤ +125°C
(
)
A
A
Maxim Integrated
│ 12
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Example 1:
0.16
T = +95°C
A
V
= +5V
OUT
V
= +14V
= +5V
DEVICE EXPOSED
PAD SOLDERED TO
1IN COPPER ISLAND
IN
0.14
V
OUT
2
Find the maximum allowable output current. First cal-
culate package dissipation at the given temperature as
follows:
0.12
0.10
0.08
T
A
= +70°C
P
=1.538W - 0.01923W/°C 95°C-70°C
) (
(
)
D
= 1.057W
T
A
= +85°C
0.06
0.04
0.02
Then determine the maximum output current:
1.057W
(
)
I
=
= 117.4mA
OUT MAX
(
)
T
A
= +125°C
14V - 5V
( ) (
)
0
Example 2:
0
5
10 15 20 25 30 35 40 45 50 55 60 65 70
(V)
V
IN
T = +125°C
A
V
IN
= +14V
Figure 6. Maximum Output Current vs. Input Voltage
V
OUT
= +3.3V
In Example 3, the maximum output current is calculated
as 170.9mA, however, the maximum output current can-
not exceed 150mA. Use Figure 6 to quickly determine
allowable maximum output current for selected ambient
temperatures.
Calculate package dissipation at the given temperature
as follows:
P
=1.538W- 0.01923W/°C 125°C-70°C
) (
(
)
D
= 480.4mW
Capacitor Selection and Regulator Stability
And establish the maximum current:
For stable operation over the full temperature range
and with load currents up to 150mA, use a 15μF (min)
output capacitor with an ESR < 0.5Ω. To reduce noise
and improve load-transient response, stability, and power-
supply rejection, use larger output capacitor values such
as 22μF.
480.4mW
(
(
)
)
I
=
= 44.89mA
OUT MAX
(
)
14V - 3.3V
) (
Example 3:
Some ceramic dielectrics exhibit large capacitance and
ESR variation with temperature. For dielectric capaci-
tors such as Z5U and Y5V, use 22μF or more to ensure
stability at temperatures below -10°C. With X7R or X5R
dielectrics, 15μF should be sufficient at all operating tem-
peratures. For high-ESR tantalum capacitors use 22μF
or more to maintain stability. To improve power-supply
rejection and transient response use a minimum 10μF
capacitor between IN and GND.
T = +50°C
A
V
V
= +14V
= +5V
IN
OUT
Calculate package dissipation at the given temperature
as follows:
P
= 1.538W
D
And find the maximum output current:
1.538W
(
(
)
= 170.9mA ⇒ I
I
=
= 150mA
OUT MAX
OUT MAX
(
)
(
)
14V - 5V
) (
)
Maxim Integrated
│ 13
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Selector Guide
PRESET
RESET THRESHOLD
(V
V
RESET
OUT
TOLERANCE
ADJUSTABLE
REGULATOR
OUTPUT
V
)
OUT
TH
WATCHDOG
TIMER
PART
/V
V
V
OUT
OUT
5V
3.3V 4.63V
4.38V
3.05V
2.89V
- 7.5% - 12.5%
ü
ü
ü
—
—
—
ü
ü
—
ü
ü
ü
MAX5023L
MAX5023M
MAX5023T
MAX5023S
MAX5024L
MAX5024M
MAX5024T
MAX5024S
—
—
ü
—
ü
—
—
ü
—
—
—
ü
—
ü
—
—
—
—
ü
—
—
—
—
—
—
—
ü
ü
—
—
ü
—
—
—
ü
—
ü
ü
ü
—
—
—
ü
—
ü
—
—
ü
—
—
—
ü
—
ü
—
—
—
—
ü
ü
—
—
—
—
ü
ü
—
—
—
—
—
ü
ü
ü
—
—
Ordering Information
Chip Information
PROCESS: BiCMOS
PART
TEMP RANGE
PIN-PACKAGE
MAX5023_ ASA
MAX5023_ ASA/V+**
MAX5024_ ASA
MAX5024_ ASA/V+
-40°C to +125°C 8 SO-EP*
-40°C to +125°C 8 SO-EP*
-40°C to +125°C 8 SO-EP*
-40°C to +125°C 8 SO-EP*
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
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.
PACKAGE
TYPE
PACKAGE OUTLINE
CODE
LAND
PATTERN NO.
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
NO.
8L SOIC
S8E+14
21-0111
90-0151
**Future product—contact factory for availability.
Maxim Integrated
│ 14
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MAX5023/MAX5024
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
3
4
5/14
3/15
No /V OPNs; removed automotive reference from Applications section
1
Added /V OPNs to Ordering Information and updated Selector Guide;
added Automotive to Applications section; renumbered notes in Electrical
Characteristics section; moved Ordering Information, Pin Configurations, and
Typical Operating Circuit
1–4, 8, 13
Changed WDI Pulse Width in Electrical Characteristics table from 50ns (min)
to 50ns (typ); updated package code in Package Information section
5
6
5/15
5/15
4, 14
Updated junction-to-ambient thermal resistance in Package Thermal
Characteristics section
2
7
8/15
3/16
Changed MAX5023_ASA/V+ to future product in Ordering Information
Updated package type in Package Information section
14
14
8
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.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2016 Maxim Integrated Products, Inc.
│ 15
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