MAX14588 [MAXIM]
1A Adjustable Overcurrent and Overvoltage Protector with High Accuracy; 1A可调式过电流和过电压保护器，高精度
| 型号： | MAX14588 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1A Adjustable Overcurrent and Overvoltage Protector with High Accuracy |
| 文件： | 总15页 (文件大小：2247K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
General Description
The MAX14588 adjustable overvoltage and overcurrent
protection device is ideal for protecting systems against
positive and negative input voltage faults up to ±40V, and
Benefits and Features
● Robust Industrial Power Protection
• Wide Input Supply Range: +4.5V to +36V
• Negative Input Tolerance to -36V
feature low 190mΩ (typ) R
integrated FETs.
ON
• Low R
190mΩ (typ)
ON
The adjustable overvoltage range is between 6V and 36V,
while the adjustable undervoltage range is between 4.5V
and 24V. The overvoltage lockout (OVLO) and undervoltage
lockout (UVLO) thresholds are set using optional external
resistors. The factory preset internal OVLO threshold is 33V
(typ), and the preset internal UVLO threshold is 19V (typ).
• Reverse Current Flow Control Input
• Thermal Overload Protection
• Extended -40ºC to +125ºC Temperature Range
● Flexible Design Options
• Adjustable OVLO and UVLO Thresholds
• Programmable Forward-Current Limit: 0.15A to 1A
The MAX14588 also features programmable current-limit
protection up to 1A. The device can be set for autoretry,
latch-off, or continuous fault response when an overcur-
rent event occurs. Once current reaches the threshold, the
MAX14588 turns off after 21ms (typ) blanking time, and
stays off during the retry period when set to autoretry mode.
The device latches off after the blanking time when set to
latch-off mode. The device limits the current continuously
when set to continuous mode. The MAX14588 also features
reverse current and thermal shutdown protection.
• Programmable Overcurrent Fault Response:
Autoretry, Latch-Off, and Continuous
• Dual Enable Inputs: EN and High Voltage HVEN
● Saves Space
• 16-Pin, 3mm x 3mm, TQFN Package
Applications
● Sensor Systems
The MAX14588 is available in a small, 16-pin (3mm x 3mm)
TQFN package. The MAX14588 operates over the -40°C to
+125°C extended temperature range.
● Condition Monitoring
● Factory Sensors
● Process Analytics
● Process Instrumentation
● Weighing and Batching Systems
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX14588.related.
Typical Application Circuit
V
POWER
IN
IN
OUT
OUT
0.47µF
4.7µF
RIEN
EN
100kΩ
R3
R1
SYSTEM
V
IO
SYSTEM
POWER
SUPPLY
MAX14588
OPTIONAL FOR
HIGH INPUT
SURGE
HVEN
GND
UVLO
OVLO
SETI
FLAG
CLHS
APPLICATIONS
CLTS1
CLTS2
R4
R2
CLTS_MODE
HVEN
GND
19-6551; Rev 0; 12/12
MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Absolute Maximum Ratings
(All voltages referenced to GND.)
I
(DC Operating)(Note 1)...................................................1.0A
IN
IN to GND...............................................................-40V to +40V
IN to OUT...............................................................-40V to +40V
OUT.......................................................................-0.3V to +40V
HVEN......................................................................-40V to +40V
OVLO, UVLO, FLAG, EN, RIEN,
Continuous Power Dissipation (T = +70ºC)
A
TQFN (derate 20.8mW/ºC above +70ºC) ...................1667mW
Operating Temperature Range..........................-40ºC to +125ºC
Maximum Junction Temperature .....................................+150ºC
Storage Temperature Range.............................-65ºC to +150ºC
Lead Temperature (soldering, 10s) .................................+300ºC
Soldering Temperature (reflow).......................................+260ºC
CLTS1, CLTS2, CLTS_MODE.............................-0.3V to +6V
SETI............................................ -0.3V to min(V , 1.22V)+0.3V
IN
CLHS............................................... -0.3V to min(V , 5V)+0.3V
IN
Note 1: DC current is also limited by the thermal design of the system.
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 2)
Package Thermal Characteristics
TQFN
Junction-to-Ambient Thermal Resistance (θ )............48ºC/W
Junction-to-Case Thermal Resistance (θ ).................10ºC/W
JC
JA
Note 2: 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 = 4.5V to 36V, T = -40ºC to +125ºC, unless otherwise noted. Typical values are at V = 24V, R
= 12kΩ, T = +25ºC.) (Note 3)
A
IN
A
IN
SETI
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
36
UNITS
V
IN Voltage
V
4.5
IN
SHDN
Shutdown IN Current
I
V
= 0V, V
= 0V, V
= 5V
= 5V,
6.6
0.1
16
µA
EN
HVEN
V
V
EN
HVEN
Shutdown OUT Current
I
2
µA
OFF
= 0V
OUT
Reverse IN Current
Supply Current
I
V
V
V
V
V
V
= -40V, V
= V = 0V
GND
-35
-21
530
33
µA
µA
IN_RVS
IN
IN
IN
IN
IN
IN
OUT
I
= 15V, V
rising
= 0V
800
34.3
33.7
19.5
20.2
IN
HVEN
32
Internal Overvoltage Trip Level
V
V
V
OVLO
falling
falling
rising
30.3
17.5
18.2
32
18.5
19.2
3
Internal Undervoltage Trip Level
Overvoltage Lockout Hysteresis
V
UVLO
% of typical OVLO
%
V
External OVLO Adjustment
Range
(Note 4)
6
36
External OVLO Select Threshold
Voltage
V
0.3
-100
4.5
0.4
0.4
0.5
+100
24
V
nA
V
SEL_OVLO
External OVLO Leakage
I
V
< 1.2V
OVLO_LEAK
OVLO
External UVLO Adjustment
Range
(Note 4)
External UVLO Select Threshold
Voltage
V
0.3
0.5
V
SEL_UVLO
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Electrical Characteristics (continued)
(V = 4.5V to 36V, T = -40ºC to +125ºC, unless otherwise noted. Typical values are at V = 24V, R
= 12kΩ, T = +25ºC.) (Note 3)
A
IN
A
IN
SETI
PARAMETER
SYMBOL
CONDITIONS
< 1.2V
UVLO
MIN
TYP
MAX
+100
1.247
UNITS
External UVLO Leakage
BG Reference Voltage
CLHS Voltage
I
V
-100
1.196
23
nA
V
UVLO_LEAK
V
1.220
3.5
BG
V
Source 100µA
V
CLHS
INTERNAL FETs
Internal FETs On-Resistance
Current-Limit Adjustment Range
R
I
= 100mA, V ≥ 8V
190
370
1.0
mΩ
ON
LOAD
IN
I
0.15
-20
A
LIM
0.15A ≤ I
< 0.3A
+20
+10
LIM
Current-Limit Accuracy
%
0.3A ≤ I
< 1.0A
-10
LIM
FLAG Assertion Drop Voltage
Threshold
Increase (V - V
asserts, V = 24V
IN
) drop until FLAG
IN
OUT
V
400
600
800
0.4
mV
V
FA
FLAG Output Logic-Low Voltage
I
= 1mA
SINK
FLAG Output Leakage Current
V
= V
= 5V, flag deasserted
2
µA
IN
FLAG
Reverse-Current Blocking
Threshold
V
V
V
- V
IN
25
1
100
430
250
mV
µA
RIB
OUT
Reverse-Blocking Supply Current
I
- V > 130mV, current into OUT
700
RBL
OUT
IN
LOGIC INPUTS
HVEN Threshold Voltage
HVEN Threshold Hysteresis
HVEN Input Current
V
2
2
3.5
41
V
%
HVENTH
I
V
V
= 36V
26
µA
HVEN_
HVEN
HVEN Input Reverse Current
I
= V
= -36V
-43
1.4
-28
µA
V
HVEN_R
IN
HVEN
EN, RIEN, CLTS1, CLTS2,
CLTS_MODE Input Logic-High
V
IH
EN, RIEN, CLTS1, CLTS2,
CLTS_MODE Input Logic- Low
V
0.4
+1
V
IL
EN, RIEN, CLTS1, CLTS2,
CLTS_MODE Input Leakage
Current
V
= 5V
-1
µA
ILEAK
LOGIC
DYNAMIC (NOTE 5)
From OFF to ON (see Table 2),
= 240Ω, C = 470µF
Switch Turn-On Time
500
3
µs
µs
t
ON
R
LOAD
OUT
From ON to OFF (see Table 2),
= 47Ω, C = 1µF
Switch Turn-Off Time
t
OFF
R
LOAD
OUT
From (V > V
) to
IN
OVLO
Overvoltage Switch Turn-Off
Time
(V
= 80% of V ),
3
3
µs
µs
t
OFF_OVP
OUT
IN_OVLO
R
= 47Ω
After t
BLANK
LOAD
Overcurrent Switch Turn-Off Time
t
OFF_OCP
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Electrical Characteristics (continued)
(V = 4.5V to 36V, T = -40ºC to +125ºC, unless otherwise noted. Typical values are at V = 24V, R
= 12kΩ, T = +25ºC.) (Note 3)
A
IN
A
IN
SETI
PARAMETER
SYMBOL
CONDITIONS
< V < V )
IN_OVLO
MIN
TYP
MAX
UNITS
From (V
IN_UVLO
IN
IN Debounce Time
and (EN = high or HVEN = low) to
= 10% of V
14
16.5
19
ms
t
DEB
V
OUT
IN
Blanking Time
17.8
527
21
24.1
ms
ms
t
BLANK
After blanking time from I
FLAG deasserted
> I
to
OUT
LIM
Autoretry Time
620
713
t
RETRY
THERMAL PROTECTION
Thermal Shutdown
150
30
ºC
ºC
Thermal Shutdown Hysteresis
Note 3: All devices are 100% production tested at T = + 25ºC. Specifications over the
A
operating temperature range are guaranteed by design.
Note 4: All timing is measured using 20% and 80% levels.
Timing Diagrams
AUTORETRY VERSIONS
t
t
t
t
t
t
BLANK
BLANK
RETRY
BLANK
RETRY
BLANK
t
RETRY
OUT
THE DEVICE COMES
OUT OF THERMAL
SHUTDOWN MODE
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES
TO THERMAL
SHUTDOWN MODE
FLAG
NOTE: TIME NOT IN SCALE
Figure 1. Autoretry Fault Diagram
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Timing Diagrams (continued)
LATCH VERSION
t
t
BLANK
BLANK
OUT
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES
THE DEVICE COMES
OUT OF THERMAL
SHUTDOWN MODE
TO THERMAL
SHUTDOWN MODE
INPUT OR EN CYCLE
FLAG
NOTE: TIME NOT IN SCALE
Figure 2. Latchoff Fault Diagram
CONTINUOUS VERSIONS
t
BLANK
OUT
THE DEVICE COMES OUT OF
THERMAL SHUTDOWN MODE
CURRENT LIMIT
LOAD CURRENT
THE DEVICE GOES TO
THERMAL SHUTDOWN MODE
FLAG
NOTE: TIME NOT IN SCALE
Figure 3. Continuous Fault Diagram
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Timing Diagrams (continued)
< t
< t
DEB
t
DEB
DEB
UVLO
THRESHOLD
V
IN
ON
OFF
SWITCH
STATUS
NOTE: TIME NOT IN SCALE
Figure 4. Debounce Timing
Typical Operating Characteristics
(C = 1µF, C
= 1µF, T = +25°C, unless otherwise noted.)
A
IN
OUT
IN QUIESCENT SUPPLY CURRENT
vs. IN VOLTAGE
IN QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
1000
900
800
700
600
500
400
300
200
100
0
600
500
400
300
200
100
0
1.005
V
EN
= 3V
V = 5V
EN
V
IN
= 32V
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
I
= 100mA
OUT
V
IN
= 24V
V
IN
= 12V
0
10
20
30
40
-40 -25 -10
5
20 35 50 65 80 95 110 125
12
16
20
24
28
32
36
IN VOLTAGE (V)
TEMPERATURE (ºC)
IN VOLTAGE (V)
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Typical Operating Characteristics (continued)
(C = 1µF, C
= 1µF, T = +25°C, unless otherwise noted.)
A
IN
OUT
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
NORMALIZED CURRENT LIMIT
vs. SUPPLY VOLTAGE
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
R
= 12kΩ
V
IN
= 24V
SETI
V
IN
= 32V
V
IN
= 24V
V
IN
= 12V
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
10
20
30
40
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
IN VOLTAGE (V)
TEMPERATURE (ºC)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN FORWARD CURRENT
vs. TEMPERATURE
SWITCH DEBOUNCE TIME
vs. TEMPERATURE
12
10
8
0.5
0.4
0.3
0.2
0.1
0
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
V
IN
= 24V
R = 24Ω
L
V
IN
= 32V
6
V
V
= 24V
= 12V
IN
V
IN
= 32V
4
V
IN
= 24V
2
IN
V
IN
= 12V
0
-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 (ºC)
TEMPERATURE (ºC)
TEMPERATURE (ºC)
SWITCH TURN-OFF TIME
vs. TEMPERATURE
POWER-UP RESPONSE
CURRENT LIMIT vs. R
SETI
MAX14588 toc12
1.2
1.0
0.8
0.6
0.4
0.2
0
50
45
40
35
30
25
20
15
10
5
V
V = 24V
IN
IN
10V/div
V
IN
= 24V
R = 24Ω
L
V
OUT
10V/div
0
0
20
40
(kΩ)
60
80
20ms/div
-40 -25 -10
5
20 35 50 65 80 95 110 125
R
SETI
TEMPERATURE (ºC)
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Typical Operating Characteristics (continued)
(C = 1µF, C
= 1µF, T = +25°C, unless otherwise noted.)
A
IN
OUT
REVERSE BLOCKING RESPONSE
FLAG RESPONSE
MAX14588 toc13
MAX14588 toc14
V
V
= 3V
R = 240Ω
L
RIEN
SUDDEN SHORT
APPLIED AT OUT
IN
20V/div
0V
0V
V
IN
20V/div
0V
0V
V
OUT
20V/div
V
OUT
V
20V/div
FLAG
5V/div
V
I
FLAG
OUT
5V/div
10A/div
200µs/div
1ms/div
CURRENT-LIMIT RESPONSE
CURRENT LIMIT-RESPONSE
MAX14588 toc16
MAX14588 toc15
100mA
TO SUDDEN
SHORT ON OUT
100mA
TO SHORT
ON OUT WITH 1A/s
V
V
IN
IN
20V/div
20V/div
0V
0V
0V
0V
V
OUT
V
OUT
20V/div
20V/div
I
I
OUT
500mA/div
OUT
500mA/div
0A
0A
10ms/div
100ms/div
BLANKING TIME
RETRY TIME
MAX14588 toc17
MAX14588 toc18
AUTORETRY
AUTORETRY
V
V
OUT
500mV/div
OUT
500mV/div
4ms/div
100ms/div
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Pin Configuration
TOP VIEW
12
11
10
9
OVLO
8
7
6
5
EN 13
OUT 14
IN
MAX14588
OUT
IN
15
16
*EP
HVEN
RIEN
+
1
2
3
4
TQFN
*CONNECT EP TO GND
Pin Description
PIN
NAME
FUNCTION
Current-Limit-Type Select Mode.
1
CLTS_MODE
CLTS_MODE = 0: CLTS1 and CLTS2 are sampled only when (V – V
CLTS_MODE = 1: CLTS1 and CLTS2 are continuously sampled.
) < 0.6V.
OUT
IN
Current-Limit-Type-Select Logic-High Voltage. Connect CLTS_MODE/CLTS1/CLTS2 to CLHS for
logic-high.
2
CLHS
3
4
CLTS1
CLTS2
HVEN
IN
Current-Limit-Type Select 1. See Table 1.
Current-Limit-Type Select 2. See Table 1.
5
36V Capable Active-Low Enable Input. See Table 2.
Overvoltage Protection Input. Bypass IN to ground with a 0.47µF ceramic capacitor.
6, 7
Externally Programmable Overvoltage Lockout Threshold. Connect OVLO to GND to use the
default internal OVLO threshold. Connect OVLO to an external resistor-divider to define a
threshold externally and override the preset internal OVLO threshold.
8
9
OVLO
UVLO
Externally Programmable Undervoltage Lockout Threshold. Connect UVLO to GND to use
the default internal UVLO threshold. Connect UVLO to an external resistor-divider to define a
threshold externally and override the preset internal UVLO threshold.
Overload-Current-Limit Adjust. Connect a resistor from SETI to GND to program the overcurrent
limit. SETI must be connected to a resistor. If SETI is connected to GND, the FETs turn off and
FLAG is asserted. Do not connect more than 10pF to SETI.
10
11
SETI
GND
Ground
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Pin Description (continued)
PIN
NAME
FUNCTION
Open-Drain Fault Indicator Output. FLAG goes low when the fault duration exceeds the blanking
time, reverse current is detected, thermal shutdown mode is active, OVLO threshold is reached, or
SETI is connected to GND.
12
FLAG
13
EN
Active-High Enable Input. See Table 2.
Output Voltage. Output of internal FETs. Bypass OUT to GND with a 1µF ceramic capacitor placed
as close to the device as possible.
14,15
OUT
Reverse-Current Enable Input. Connect RIEN to GND to disable the reverse-current flow
protection. Connect RIEN to logic-high to activate the reverse-current flow protection.
16
—
RIEN
EP
Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection.
Functional Diagram
IN
OUT
OUT
REVERSE-INPUT
REVERSE-CURRENT
PROTECTION
IN
FLAG
N
CONTROL LOGIC
V
BG
EN
RIEN
HVEN
CLHS
UVLO
CLTS1
V
V
SEL
CLTS2
THERMAL
SHUTDOWN
CLTS_MODE
OVLO
SETI
SEL
MAX14588
GND
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
The autoretry feature reduces the system power in case
Detailed Description
The MAX14588 is an adjustable overvoltage and over-
current protection device designed to protect systems
against positive and negative input voltage faults up to
of overcurrent or short-circuit conditions. During t
BLANK
time, when the switch is on, the supply current is held
at the current limit. During t time, when the switch
RETRY
is off, there is no current through the switch. Thus, the
output current is much less than the programmed current
limit. Calculate the average output current using the fol-
lowing equation.
±40V, and features a low 190m
Ω (typ) on-resistance
FET. If the input voltage exceeds the OVLO threshold
or falls below the UVLO, the internal FETs are turned off
to prevent damage to the protected components. If the
OVLO or the UVLO pin is set below the external OVLO
t
BLANK
I
= I
LIM
or UVLO select threshold (V
, V
), the
SEL_OVLO SEL_UVLO
LOAD
t
+ t
BLANK
RETRY
device automatically selects the internal ±5% accurate
trip thresholds. The internal OVLO threshold is preset to
33V (typ), and the internal UVLO threshold is preset to
19V (typ).
With a 21ms (typ) t
duty cycle is 3.3%, resulting in a 96.7% power saving.
and 620ms (typ) t
, the
RETRY
BLANK
Latch-Off
Current-Limit Type Select
When the current threshold is reached, the t
timer
BLANK
The MAX14588 power-up current-limit default is continu-
ous mode when CLTS_MODE is low. After power up, the
current-limit type can be programmed externally through
CLTS1 and CLTS2 (Table 1). When CLTS_MODE is high,
CLTS1 and CLTS2 are sampled continuously. When
CLTS_MODE is low, CLTS1 and CLTS2 are sampled
begins counting. The FLAG asserts if the overcurrent
condition is present for t The timer resets when
.
BLANK
the overcurrent condition disappears before t
has
BLANK
elapsed. The switch turns off and stays off if the over-
current condition continues beyond the blanking time.
To reset the switch, either toggle the control logic EN or
HVEN or cycle the input voltage. (Figure 2)
only when V -V
< 0.6V. Connect CLTS1, CLTS2,
IN OUT
and CLTS_MODE to CLHS for logic-high or to GND for
logic-low.
Continuous
When the current threshold is reached, the MAX14588
limits the output current to the programmed current limit.
The FLAG asserts if the overcurrent condition is present
BLANK
removed. (Figure 3)
Autoretry
When the current threshold is reached, the t
begins counting. The FLAG asserts if the overcurrent con-
dition is present for t The timer resets if the over-
current condition disappears before t
A retry time delay, t
timer
BLANK
for t
and deasserts when the overload condition is
.
BLANK
has elapsed.
, is started immediately after
BLANK
Reverse-Current Block Enable (RIEN)
RETRY
This feature disables the reverse-current protection and
enables reverse-current flow from OUT to IN. The reverse-
current block enable feature is useful in applications with
inductive loads.
t
has elapsed and during t
time, the FETs
BLANK
RETRY
are off. At the end of t
, the FETs are turned on
RETRY
again. If the fault still exists, the cycle is repeated and the
FLAG stays low. When the fault is removed, the FETs stay
on. (Figure 1)
Fault Flag Output
FLAG is an open-drain fault indicator output and requires
an external pull-up resistor to a DC supply. FLAG goes
low when any of the following conditions occur:
Table 1. Current-Limit Type Select
CLTS2
CLTS1
CURRENT-LIMIT TYPE
LATCH OFF
0
0
1
1
0
1
0
1
● The blanking time has elapsed
● The reverse-current protection has tripped
● The die temperature exceeds +150ºC
● SETI is connected to ground
AUTORETRY
CONTINUOUS
CONTINUOUS
● OVLO threshold is reached
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Thermal Shutdown Protection
Input Debounce Protection
The MAX14588 has a thermal-shutdown feature to pro-
tect the device from overheating. The device turns off and
the FLAG asserts when the junction temperature exceeds
+150ºC (typ). The devices exit thermal shutdown and
resume normal operation after the junction temperature
cools by 30ºC (typ), except when in latch off mode, the
device remains latched off.
The MAX14588 features input debounce protection.
When the input voltage is higher than the UVLO thresh-
old voltage for a period greater than the debounce time
(t
), the internal FETs are turned on. This feature is
DEB
intended for applications where the EN or HVEN signal
is present when the power supply ramps up (Figure 3).
Applications Information
The thermal limit behaves similar to the current limit. For
autoretry mode, the thermal limit works with auto retry
timer. When the device comes out of the thermal limit, it
starts after the retry time. For latch off mode, the device
latches off until power or EN cycle. For continuous mode,
the device only disables while the temperature is over the
limit. There is no blanking time for thermal protection.
Setting the Current Limit/Threshold
A resistor from SETI to ground programs the current-limit/
threshold value for the MAX14588. Leaving SETI uncon-
nected selects a 0A current limit/threshold. Connecting
SETI to ground asserts FLAG.
Use the following formula to calculate the current limit:
Overvoltage Lockout (OVLO)
The MAX14588 has a 33V (typ) preset OVLO threshold
when the voltage at OVLO is set below the external
6100
R
(kΩ) =
SETI
I
(mA)
LIM
OVLO select voltage (V
). Connect OVLO to GND to
SEL
IN Bypass Capacitor
activate the preset OVLO threshold. Connect the external
resistors to OVLO pin as shown in the Typical Operating
Circuit to externally adjust the OVLO threshold. Use the
following equation to adjust the OVLO threshold. The rec-
ommended value for R3 is 2.2MΩ.
Connect a minimum of 0.47µF capacitor from IN to GND
to limit the input voltage drop during momentary output
short-circuit conditions. Larger capacitor values further
reduce the voltage undershoot at the input.
Hot Plug IN
R3
R4
V
= V
× 1+
OVLO
BG
In many system powering applications, an input filter-
ing capacitor is required to lower the radiated emission,
enhance the ESD capability, etc. In hot plug applications,
parasitic cable inductance along with the input capacitor
causes overshoot and ringing when the powered cable is
connected to the input terminal.
Undervoltage Lockout (UVLO)
The MAX14588 has a 19V (typ) preset UVLO threshold
when the voltage at UVLO is set below the external OVLO
select voltage (V
). Connect UVLO to GND to activate
SEL
This effect causes the protection device to see almost
twice the applied voltage. An input voltage of 24V can
easily exceed the absolute maximum rating of 40V, which
may permanently damage the device. A transient voltage
suppressor (TVS) is often used for industrial applications
to protect the system from these conditions. We recom-
mend using a TVS that is capable of limiting the input
surge to 40V placed close to the input terminal.
the preset UVLO threshold. Connect the external resistors
to UVLO pin as shown in the Typical Operating Circuit to
externally adjust the UVLO threshold. Use the following
equation to adjust the UVLO threshold. The recommend-
ed value for R1 is 2.2MΩ.
R1
V
= V
× 1+
UVLO
BG
R2
Switch Control
Table 2. Enable Inputs
There are two independent enable inputs (HVEN and
EN) for MAX14588. HVEN is a high-voltage capable
input. Toggle HVEN or EN to reset the fault condition
once short-circuit is detected and the device shuts down
(Table 2).
EN
0
SWITCH STATUS
HVEN
0
0
1
1
ON
ON
1
0
OFF
ON
1
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
OUT Bypass Capacitor
Layout and Thermal Dissipation
For stable operation over the full temperature range and
over the entire programmable current-limit range, con-
nect a 4.7µF ceramic capacitor from OUT to ground.
Excessive output capacitance can cause a false overcur-
rent condition due to decreased dv/dt across the capaci-
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors as
close as possible to the device (no more than 5mm). IN
tor. Calculate the maximum capacitive load (C
that can be connected to OUT by using the following
formula:
) value
and OUT must be connected with wide short traces to the
power bus. During normal operation, the power dissipa-
tion is small and the package temperature change is mini-
mal. If the output is continuously shorted to ground at the
maximum supply voltage, the switches with the autoretry
option do not cause thermal shutdown detection to trip:
MAX
I
(mA) x t
(ms)
BLANK(TYP)
LIM
C
(µF) =
MAX
V
(V)
IN
V
×I
× t
For example, for V = 24V, t
= 20ms, and
IN(MAX) OUT(MAX) BLANK
IN
BLANK(TYP)
P
=
(MAX)
I
= 1A, C
equals 833µF.
LIM
MAX
t
+ t
BLANK
RETRY
Output Freewheeling Diode for
Inductive Hard Short to Ground
In applications that require protection form a sudden short
to ground with an inductive load or a long cable, a schottky
diode between the OUT terminal and ground is recom-
mended. This is to prevent a negative spike on the OUT
due to the inductive kickback during a short-circuit event.
Attention must be given to continuous current-limit mode
when the power dissipation during a fault condition can
cause the device to reach the thermal shutdown threshold.
Thermal vias from the exposed pad to ground plane are
highly recommended to increase the system thermal capac-
itance while reducing the thermal resistance to the ambient.
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Ordering Information
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.
TEMP
PART
TOP
MARK
PIN-
PACKAGE
RANGE
-40ºC to
MAX14588ETE+T
+125ºC
16 TQFN-
AJZ
EP*
+ Denotes a lead(Pb)-free package/RoHS-compliant package.
T = Tape and reel
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
*EP = Exposed Pad
16 TQFN-EP
T1633+5
21-0136
90-0032
Chip Information
PROCESS: BiCMOS
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MAX14588
1A Adjustable Overcurrent and Overvoltage
Protector with High Accuracy
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
12/12
Initial release
—
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.
2012 Maxim Integrated Products, Inc.
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