MAX17609ATC+T [MAXIM]
4.5V to 60V, 1A Current Limiter with OV, UV, and Reverse Protection;
| 型号： | MAX17609ATC+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 4.5V to 60V, 1A Current Limiter with OV, UV, and Reverse Protection |
| 文件： | 总21页 (文件大小：619K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
General Description
Benefits and Features
The Olympus series of ICs are the industry’s smallest
and robust integrated system protection solutions. The
MAX17608/MAX17609/MAX17610 adjustable overvoltage
and overcurrent protection devices are ideal to protect
systems against positive and negative input voltage faults up
● Robust Protection Reduces System Downtime
• Wide Input-Supply Range: +4.5V to +60V
• Hot Plug-in Tolerant Without TVS up to 35V Input
Supply
• Negative Input Tolerance to -65V
• Low R
260mΩ (typ)
to +60V and -65V, and feature low 260mΩ (typ) R
FETs.
ON
ON
• Reverse Current-Blocking Protection
• Thermal Overload Protection
• Extended -40°C to +125°C Temperature Range
The adjustable input overvoltage protection range is 5.5V
to 60V and the adjustable input undervoltage protection
range is 4.5V to 59V. The input overvoltage-lockout
(OVLO) and undervoltage-lockout (UVLO) thresholds are
set using external resistors. Additionally, the devices offer
an internal input undervoltage threshold at 4V (typ).
• MAX17608 Enables OV, UV, and Reverse Voltage
Protection
• MAX17609 Enables OV and UV Protection
• MAX17610 Enables Reverse Voltage Protection
● Flexible Design Options Enable Reuse and Less
Requalification
The devices feature programmable current-limit protection
up to 1A; hence, controlling the inrush current at startup
while charging high capacitances at the output. Current-
limit threshold is programmed by connecting a resistor from
the SETI pin to GND. When the device current reaches
the programmed threshold, the device prevents further
increases in current by modulating the FET resistance. The
devices can be programmed to behave in three different
ways under current-limit condition: Autoretry, Continous, or
Latch-off modes. The voltage appearing on the SETI pin is
proportional to the instantaneous current flowing through
the device and is read by an ADC.
• Adjustable OVLO and UVLO Thresholds
• Programmable Forward-Current Limit: 0.1A to 0.2A
with ±5% Accuracy and 0.2A to 1.0A with ±3%
Accuracy Over Full Temperature Range
• Programmable Overcurrent Fault Response:
Autoretry, Continuous, and Latch-Off Modes
• Smooth Current Transitions
● Saves Board Space and Reduces External BOM
Count
• 12-Pin, 3mm x 3mm, TDFN-EP Package
• Integrated FETs
MAX17608 and MAX17610 block current flowing in the
reverse direction (i.e., from OUT to IN) whereas MAX17609
allows current flow in the reverse direction. The devices
feature thermal shutdown protection against excessive
power dissipation.
Ordering Information appears at end of data sheet.
The devices are available in a small, 12-pin (3mm x 3mm)
TDFN-EP package. The devices operate over the -40°C to
+125°C extended temperature range.
Applications
● Sensor Systems
● Condition Monitoring
● Factory Sensors
● Process Instrumentation
● Weighing and Batching Systems
● Industrial Applications such as PLC, Network-Control
Modules, Battery-Operated Modules
19-100228; Rev 1; 6/18
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Typical Operating Circuits
MAX17608 and MAX17609
IN
OUT
0.47µF
4.7µF
V
PULLUP
SYSTEM
R3
MAX17608
MAX17609
SYSTEM
FLAG
UVOV
EN
FAULT
OPTIONAL
POWER
FOR
SUPPLY
OVLO
UVLO
UV/OV FAULT
HIGH
INPUT
R1
R2
SURGE
APPLICATIONS
EN
R4
CLMODE
SETI
ADC
GND
R
SETI
MAX17610
IN
OUT
0.47µF
4.7µF
V
PULLUP
SYSTEM
MAX17610
FORWARD
FAULT
REVERSE
FAULT
SYSTEM
POWER
SUPPLY
FWD
REV
EN
OPTIONAL
FOR
HIGH
INPUT
SURGE
EN
APPLICATIONS
CLMODE
SETI
ADC
GND
R
SETI
Maxim Integrated
│ 2
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Absolute Maximum Ratings
IN to GND...............................................................-70V to +65V
IN to OUT ...............................................................-65V to +65V
OUT to GND .........................................................-0.3V to +65V
SETI to GND (Note 1) ..........................................-0.3V to +1.6V
Continuous Power Dissipation (12 pin TDFN-EP
(T = +70°C, derate 24.4mW/°C above +70°C)) ...1951.2mW
A
UVLO, OVLO to GND .............-0.3V to MAX(V , V
UVOV, FLAG, FWD, REV, EN,
CLMODE to GND.............................................-0.3V to +6.0V
IN Current (DC) ....................................................................1.1A
) + 0.3V
Extended Operating Temperature Range ...........-40°C to 125°C
Junction Temperature Range (Note 2)............. -40°C to +150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (Soldering, 10s).................................+300°C
IN OUT
Note 1: SETI pin is internally clamped. Forcing more than 5mA current into the pin can damage the device.
o
Note 2: Junction temperature greater than +125 C degrades operating lifetimes.
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.
Package Information
PACKAGE TYPE: 12 TDFN
Package Code
TD1233+1C
21-0664
Outline Number
Land Pattern Number
90-0397
THERMAL RESISTANCE, FOUR-LAYER BOARD:
Junction to Ambient (θ
)
41°C/W
8.5°C/W
JA
Junction to Case (θ
)
JC
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.
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 = +4.5 to +60V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V = +24V, T = +25°C, R
= 1.5kΩ.)
IN
A
IN
A
SETI
(Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN Voltage Range
V
4.5
60
60
IN
Shutdown Input Current
Shutdown Output Current
Reverse Input Current
Supply Current
I
V
V
V
V
V
V
= 0V
25
μA
SHDN
EN
I
= 0V, V
= 0V
-2
µA
OFF
EN
OUT
I
= -60V, V = 0V
OUT
-85
-50
0.88
4.02
3.5
µA
IN_RVS
IN
IN
IN
IN
I
= 24V, V = 5V
EN
1.20
4.45
mA
IN
rising
3.46
Internal Undervoltage-Trip Level
V
V
UVLO
falling
UVLO, OVLO Reference
V
1.45
1.50
1.55
100
V
REF
UVLO, OVLO Threshold
Hysteresis
3.3
%
V
= V
= 0 to 2V. (MAX17608,
UVLO
OVLO
UVLO, OVLO Leakage Current
I
-100
nA
LEAK
MAX17609 only)
Maxim Integrated
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Electrical Characteristics (continued)
(V = +4.5 to +60V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V = +24V, T = +25°C, R
= 1.5kΩ.)
IN
A
IN
A
SETI
(Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
5.5
4.5
3.0
TYP
MAX
UNITS
OVLO Adjustment Range
UVLO Adjustment Range
Internal POR
(Note 4)
(Note 4)
60
59
V
V
V
4.3
INTERNAL FETs
Internal FETs On-Resistance
Current-Limit Adjustment Range
R
I
= 100mA, V ≥ 8V
260
490
1
mΩ
ON
LOAD
IN
I
(Note 5)
0.1
-5
A
LIM
100mA ≤ I
200mA ≤ I
≤ 200mA
≤ 1.0A
+5
+3
LIM
Current-Limit Accuracy
%
-3
LIM
FLAG Assertion Drop-Voltage
Threshold
Increase (V - V
asserts, V = 24V, I = 10mA
IN IN
) drop until FLAG
IN
OUT
V
370
2
470
11
570
20
mV
mV
μs
FA
Reverse Current-Blocking
Slow Threshold
(V
- V ). (MAX17608, MAX17610
OUT IN
V
RIBS
only)
Reverse Current-Blocking
Debounce Blanking Time
t
(MAX17608, MAX17610 only)
(MAX17608, MAX17610 only)
100
14.4
70
140
16.0
105
150
0.89
180
17.6
140
230
1.25
DEBRIB
Reverse Current-Blocking
Powerup Blanking Time
t
ms
mV
ns
BLKRIB
Reverse Current-Blocking
Fast Threshold
(V
-V ). (MAX17608, MAX17610
OUT IN
V
RIBF
only)
Reverse Current-Blocking
Fast-Response Time
I
= 20A, (MAX17608,
REVERSE
t
RIB
MAX17610 only) (Note 6)
Reverse-Blocking Supply
Current
Current into OUT when (V
130mV. (MAX17608, MAX17610 only)
- V
>
OUT
IN)
I
mA
RBL
SETI
R
× I
V
1.5
V
SETI
LIM
RI
100mA ≤ I ≤ 200mA
950
970
1.6
1000
1000
1050
1030
2.2
IN
Current-Mirror Output Ratio
C
A/A
IRATIO
200mA ≤ I ≤ 1.0A
IN
Internal SETI Clamp
SETI Leakage Current
LOGIC INPUT
5mA into SETI
V
V
= 1.6V
-0.1
0.1
μA
SETI
EN Input-Logic High
EN Input-Logic Low
EN Pullup Voltage
V
1.4
V
V
IH
V
0.4
2
IL
EN pin unconnected. V = 60V
V
IN
EN Input Current
V
= 5.5V
= 0.4V
60
3.0
3.8
0.60
10
92
μA
μA
V
EN
EN
EN Pullup Current
V
1.0
2.0
0.25
8
8.0
4.9
0.95
12
CLMODE Input-Logic High
CLMODE Input-Logic Low
CLMODE Pullup Input Current
V
µA
Maxim Integrated
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Electrical Characteristics (continued)
(V = +4.5 to +60V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V = +24V, T = +25°C, R
= 1.5kΩ.)
IN
A
IN
A
SETI
(Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FLAG, UVOV, FWD, REV OUTPUTs
FLAG, UVOV, FWD, REV
Output-Logic Low Voltage
I
= 1mA
0.4
1
V
SINK
V
= V
= V
= V
= V
IN
FLAG
UVOV
FWD REV
FLAG, UVOV, FWD, REV
Output-Leakage Current
μA
= 5.5V. FLAG, UVOV, FWD and REV
pins are deasserted
TIMING CHARACTERISTICS
t
V
R
= 24V, R
= 1kΩ, C
= 0pF,
ON_
IN
LOAD
LOAD
Switch Turn-On Time
1.0
1.0
20
1.5
1.5
ms
µs
μs
= 1.5kΩ
SWITCH
SETI
Overvoltage Switch Turn-Off
Time
V
exceeds V
as a step;
REF
OVLO
t
OFF_OVP
R
= 1kΩ
LOAD
Overvoltage Falling-Edge
Debounce Time
t
DEB_OVP
I
= 1A, C
= 0, I
step from
LIM
LOAD
OUT
Overcurrent Protection Re-
sponse Time
t
0.5A to 1.5A. Time to regulate I
current limit.
to
100
16
μs
OCP_RES
OUT
From V
and EN = High to V
< V < V
IN IN_OVLO
IN_UVLO
IN Debounce Time
t
= 10% of V .
14.4
17.6
ms
DEB
OUT
IN
Elapses only at power-up.
Current-Limit Smooth-Transition
Time
t
100
40
μs
ms
ms
REF_RAMP
Current-Limit Blanking Time
t
36
44
BLANK
After blanking time from I
FLAG deasserted (Note 7)
> I
to
OUT
LIM
Current-Limit Autoretry Time
t
540
600
660
RETRY
THERMAL PROTECTION
Thermal Shutdown
T
160
28
°C
°C
J
Thermal Shutdown Hysteresis
T
J(HYS)
Note 3: All devices are 100% production tested at T = +25°C. Limits over the operating-temperature range are guaranteed by
A
design; not production tested.
Note 4: User settable. See the Overvoltage Lockout (OVLO) and Undervoltage Lockout (UVLO) sections for instructions.
Note 5: The current limit can be set below 100mA with a decresed accuracy.
Note 6: Guaranteed by design; not production tested.
Note 7: The ratio between autoretry time and blanking time is fixed and equal to 15.
Maxim Integrated
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Typical Operating Characteristics
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
IN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
IN SUPPLY CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
toc03
toc02
toc01
1.10
1.05
1.00
0.95
0.90
1.00
0.95
0.90
0.85
0.80
0.75
0.70
1.00
0.95
0.90
0.85
0.80
0.75
0.70
NORMALIZED TO
VIN = 24V
IOUT = 100mA
SETI UNCONNECTED
VIN = +24V
SETI UNCONNECTED
TA = +125°C
TA = +25°C
TA = -40°C
4
12
20
28
36
44
52
60
-50 -25
0
25 50 75 100 125 150
4
12
20
28
36
44
52
60
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
NORMALIZED CURRENT LIMIT
vs. SUPPLY VOLTAGE
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
toc04
toc06
toc05
1.03
1.02
1.01
1.00
0.99
0.98
0.97
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
NORMALIZED TO
TA = +25°C
VIN = +24V
NORMALIZED TO
VIN = +24V
RSETI = 1.5kΩ
VIN = +24V
RSETI = 1.5kΩ
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
4
12
20
28
36
44
52
60
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
NORMALIZED UVLO THRESHOLD
vs. TEMPERATURE
NORMALIZED OVLO THRESHOLD
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT vs.
TEMPERATURE
toc09
toc07
toc08
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
50
45
40
35
30
25
20
15
10
5
NORMALIZED TO
TA = +25oC
VIN = +24V
NORMALIZED TO
TA = +25°C
VIN = +24V
VIN = +24V
EN = LOW
OUT = GND
0
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Typical Operating Characteristics (continued)
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
SHUTDOWN REVERSE
CURRENT vs. TEMPERATURE
SWITCH DEBOUNCE TIME vs. TEMPERATURE
toc11
toc10
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
18.0
17.5
17.0
16.5
16.0
15.5
15.0
VIN = -24V
EN = LOW
OUT = GND
VIN = +24V
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
SWITCH TURN-OFF TIME vs. TEMPERATURE
CURRENT LIMIT vs. RSETI
toc13
toc12
100
VIN = +24V
EN TRANSITION TO IOUT FALLING
TO 10% OF INITIAL VALUE
1.0
0.8
0.6
0.4
0.2
0.0
90
80
70
60
50
40
30
20
10
0
VIN = +24V, CL = 10μF
0
2
4
6
8
10 12 14 16
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
RSETI (kΩ)
POWER-UP RESPONSE
REVERSE-BLOCKING RESPONSE
toc14
toc15
24V
20V/div
20V/div
VIN
VIN
20V/div
20V/div
35V
VOUT
24V
VOUT
VUVOV
5V/div
VFLAG
5V/div
1A/div
IIC
100mA/div
IOUT
4ms/div
10µs/div
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Typical Operating Characteristics (continued)
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
THERMAL SHUTDOWN DUE TO
OUTPUT SHORT CIRCUIT RESPONSE
OUTPUT SHORT CIRCUIT
toc16
toc17
VIN
20V/div
20V/div
VIN
20V/div
20V/div
VOUT
VOUT
5V/div
VFLAG
VFLAG
5V/div
1A/div
ILIM = 0.5A
ILIM = 1A
IOUT
500mA/div
IOUT
10ms/div
2ms/div
CURRENT-LIMIT RESPONSE
AUTORETRY TIME (tRETRY
)
toc18
toc19
AUTORETRY MODE
ILIM = 0.5A
VIN
20V/div
20V/div
VOUT
20V/div
VOUT
IOUT
500mA/div
VFLAG
5V/div
1A/div
ILIM = 1A,
IL = 100mA TO SHORT ON OUT WITH 1A/s
IOUT
VFLAG
5V/div
100ms/div
200ms/div
CURRENT SENSE RATIO
vs. INPUT CURRENT
toc20
1020
1015
1010
1005
1000
995
VIN = +24V
990
0.0
0.2
0.4
0.6
0.8
1.0
1.2
INPUT CURRENT (A)
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Pin Configurations
MAX17608, MAX17609
TOP VIEW
IN
1
2
3
4
5
6
12
11
10
OUT
OUT
IN
OVLO
UVOV
FLAG
SETI
GND
MAX17608
MAX17609
UVLO
9
8
7
EN
*EP
CLMODE
TDFN-EP
(3mm x 3mm)
MAX17610
TOP VIEW
IN
1
12
11
10
OUT
OUT
REV
FWD
SETI
GND
2
3
4
5
6
IN
N.C.
MAX17610
N.C.
9
8
7
EN
*EP
CLMODE
TDFN-EP
(3mm x 3mm)
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Pin Description
PIN
NAME
FUNCTION
MAX17608,
MAX17609
MAX17610
Input Pins. Connect a low-ESR ceramic capacitor to GND. For Hot Plug-In applications,
see the Applications Information section.
1–2
3
1–2
—
IN
OVLO Adjustment. Connect resistive potential divider from IN to GND to set the OVLO
threshold.
OVLO
UVLO
UVLO Adjustment. Connect resistive potential divider from IN to GND to set the UVLO
threshold.
4
—
—
5
3–4
N.C.
EN
Not Connected. Leave unconnected.
5
Active-High Enable Input. Internally pulled up to 1.8V.
Current-Limit Mode Selector. Connect CLMODE to GND for Continuous mode.
Connect a 150kΩ resistor between CLMODE and GND for Latch-off mode. Leave
CLMODE unconnected for Autoretry mode.
6
6
CLMODE
7
8
7
8
GND
SETI
Ground.
Overcurrent Limit Adjustment Pin and Current Monitoring Output. Connect a resistor from
SETI to GND to set overcurrent limit. See the Setting Current-Limit Threshold section.
Open-Drain, Fault Indicator Output. FLAG goes low when:
•
•
•
•
Overcurrent duration exceeds the blanking time.
Reverse current is detected (MAX17608 only).
Thermal shutdown is active.
9
—
FLAG
R
is less than 1kΩ (max).
SETI
Open-Drain, Fault Indicator Output. FWD goes low when:
•
•
•
Overcurrent duration exceeds the blanking time.
Thermal shutdown is active.
—
9
FWD
R
SETI
is less than 1kΩ (max).
Open-Drain, Fault Indicator Output. UVOV goes low when:
10
—
•
•
Input voltage falls below UVLO threshold.
Input voltage rises above OVLO threshold.
UVOV
—
10
REV
Open-Drain, Fault Indicator Output. REV goes low when reverse current is detected.
Output Pins. For a long output cable or inductive load, see the Applications Information
section.
11–12
11–12
OUT
Exposed Pad. Connect EP to a large GND plane with several thermal vias for best
thermal performance. Refer to the MAX17608 EV kit data sheet for a reference layout
design.
—
—
EP
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Functional Diagrams
MAX17608-MAX17609
IN
IN
OUT
IFET
Q2
Q1
OUT
I
FET/CIRATIO
CURRENT
REGULATION
I
FET/CIRATIO
SETI
HV FET
CONTROL
1.5V
UVOV
FLAG
REVERSE
PROTECTION
(MAX17608 Only)
1.5V
OVLO
CONTROL
LOGIC
1.5V
1.8V
UVLO
CLMODE
EN
THERMAL
SHUTDOWN
GND
Maxim Integrated
│ 11
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Functional Diagrams (continued)
MAX17610
IN
OUT
IFET
Q2
Q1
IN
OUT
I
FET/CIRATIO
CURRENT
REGULATION
I
FET/CIRATIO
SETI
HV FET
CONTROL
1.5V
REV
REVERSE
PROTECTION
FWD
CONTROL
LOGIC
1.8V
CLMODE
EN
THERMAL
SHUTDOWN
GND
Maxim Integrated
│ 12
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Operating Circuits to adjust the UVLO threshold voltage.
Use the following equation to adjust the UVLO threshold.
The recommended value of R1 is 2.2MΩ.
Detailed Description
The MAX17608/MAX17609/MAX17610 overvoltage- and
overcurrent-protection devices offer adjustable protection
boundaries for systems against input positive and negative
faults up to +60V and -65V, and output load current up to
1A. The devices feature two internal MOSFETs connected
R1
R2
V
= V
× 1+
UVLO
REF
where V
= 1.5V.
REF
in series with a low cumulative R
of 260mΩ (typ).The
ON
devices block out negative input voltages completely.
Input undervoltage protection can be programmed
between 4.5V and 59V, while the overvoltage protection
can be independently programmed between 5.5V and
60V. Additionaly, the devices have an internal default
undervoltage lockout set at 4V (typ).
All three devices have an input UVLO threshold set at 4V
(typ). MAX17610 has no UVLO pin to adjust the UVLO
threshold voltage externally.
Overvoltage Lockout (OVLO)
MAX17608 and MAX17609 devices have an OVLO
adjustment range from 5.5V to 60V. Connect an external
resistive potential divider to the OVLO pin as shown in the
Typical Operating Circuits to adjust the OVLO threshold
voltage. Use the following equation to adjust the OVLO
threshold. The recommended value of R3 is 2.2MΩ.
The devices are enabled or disabled through the EN pin
by a master supervisory system; hence, offering a switch
operation to turn on or turn off power delivery to con-
nected load.
The current through the devices is limited by setting
acurrentlimit,whichisprogrammedbyaresistorconnected
from SETI to GND. The current limit can be programmed
between 0.1A to 1A. When the device current reaches
or exceeds the set current limit, the on-resistance of
the internal FETs are modulated to limit the current to
set limits. The devices offer three different behavioral
models when under current limited operations: Autoretry,
Continuous, and Latch-Off modes. The SETI pin also
presents a voltage with reference to GND, which under
normal operation is proportional to the device current. The
voltage appearing on the SETI pin is read by an ADC on
the monitoring system for recording instantaneous device
current. To avoid oscillation, do not connect more than
10pF to the SETI pin.
R3
R4
V
= V
× 1+
OVLO
REF
where V
= 1.5V.
REF
The MAX17610 device has no OVLO pin to adjust the
OVLO threshold voltage.
The OVLO reference voltage (V
) is set at 1.5V. If the
REF
voltage at the OVLO pin exceeds V
for time equal
REF
to the overvoltage switch turn-off time (t
switch is turned off and UVOV is asserted. When the
OVLO condition is removed, the device takes the over-
), the
OFF_OVP
voltage falling-edge debounce time (t
) to start
DEB_OVP
the switch turn-on process. The switch turns back on after
switch turn-on time (t
) and UVOV is deas-
ON_SWITCH
serted. Figure 1 depicts typical behavior in overvoltage
conditions.
Thedevicesoffercommunicationsignalstoindicatedifferent
operational and fault signals. MAX17608 and MAX17609
offer FLAG and UVOV signals, while MAX17610 offers
FWD and REV signals. All communication signal pins are
open drain in nature and require external pullup resistors
to appropriate system interface voltage.
tOFF_OVP
tDEB_OVP
tON_SWITCH
1.5V
OVLO
MAX17608 and MAX17610 block reverse current flow
(from OUT to IN) while MAX17609 allows reverse current
flow.
SWITCH
STATUS
All three devices offer internal thermal shutdown protection
against excessive power dissipation.
UVOV
Undervoltage Lockout (UVLO)
TIME
NOTE: TIME NOT IN SCALE
MAX17608 and MAX17609 have a UVLO adjustment
range from 4.5V to 59V. Connect an external resistive
potential divider to the UVLO pin as shown in the Typical
Figure 1. Overvoltage-Fault Timing Diagram
Maxim Integrated
│ 13
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
the SETI pin, into the external current-limit resistor. The
voltage on the SETI pin provides information about the IN
current with the following relationship:
Input Debounce Protection
The devices feature input debounce protection. The
devices start operation (turn on the internal FETs) only
if the input voltage is higher than UVLO threshold for a
V
(V)
SETI
I
(A) =
IN−OUT
period greater than the debounce time (t
). The t
DEB
DEB
R
(kΩ)
SETI
elapses only at power-up of the devices. This feature is
intended for applications where the EN signal is present
when the power supply ramps up. Figure 2 depicts a typi-
cal debounce timing diagram.
If SETI is left unconnected, V
≥ 1.5V. The current
SETI
regulator does not allow any current to flow. During
startup, this causes the switches to remain off and FLAG
(or FWD) to assert after t
elapses. During startup,
BLANK
Enable
270μA current is forced to flow through R
. If the volt-
SETI
The devices are enabled or disabled through the EN pin
by driving it above or below the EN threshold voltage.
Hence the devices can be used to turn on or off power
delivery to connected loads using the EN pin.
age at SETI is below 150mV, the switches remain off and
FLAG (or FWD) asserts.
Current-Limit Type Select
The CLMODE pin is used to program the overcurrent
response of the devices in one of the following three modes:
Setting Current-Limit Threshold
Connect a resistor between SETI and GND to program
the current-limit threshold in the devices. Use the following
equation to calculate current-limit setting resistor:
Autoretry mode (CLMODE pin is left unconnected),
Continuous mode (CLMODE pin is connected to GND),
Latch-off mode (a 150kΩ resistor is connected between
CLMODE and GND).
1500
R
(kΩ) =
SETI
I
(mA)
LIM
Table 1. Current-Limit Threshold
vs. SETI-Resistor Values
where I
is the desired current limit in mA.
LIM
Do not use a R
current-limit thresholds for different resistor values.
smaller than 1.5kΩ. Table 1 shows
SETI
R
(kΩ)
CURRENT LIMIT (A)
SETI
15
0.10
0.30
0.50
0.75
1.00
The devices feature read-out of the current flowing into
the IN pin. A current mirror, with a ratio of C
implemented, using a current-sense auto-zero opera-
tional amplifier. The mirrored current flows out through
5
3
2
, is
IRATIO
1.5
<tDEB
<tDEB
tDEB
OVLO
UVLO
VIN
ON
OFF
SWITCH
STATUS
TIME
NOTE: TIME NOT IN SCALE
Figure 2. Debounce Timing Diagram
Maxim Integrated
│ 14
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Autoretry Current Limit
Continuous Current Limit
In autoretry current-limit mode, when current through the
In continuous current-limit mode, when current through
the device reaches the current limit threshold, the device
limits output current to the programmed current limit.
The FLAG (or FWD) pin asserts if overcurrent condition
device reaches the current-limit threshold, the t
BLANK
timer begins counting. The FLAG (or FWD) pin asserts if
the overcurrent condition is present for t . The timer
BLANK
resets if the overcurrent condition resolves before t
is present for t
and deasserts when the overload
BLANK
BLANK
has elapsed. A retry time delay (t
) starts immedi-
condition is removed. Figure 4 depicts typical behavior in
the continuous current-limit mode.
RETRY
ately after t
has elapsed. During t
time, the
BLANK
RETRY
switch remains off. Once t
has elapsed, the switch
RETRY
is turned back on again. If the fault still exists, the cycle
is repeated and FLAG (or FWD) pin remains asserted. If
the overcurrent condition is resolved, the switch stays on.
CONTINUOUS MODE
tBLANK
The autoretry feature reduces system power in case of
overcurrent or short-circuit conditions. When the switch
OUT
is on during t
time, the supply current is held at
BLANK
the current limit. During t
time, there is no current
RETRY
DEVICE COMES OUT OF
through the switch. Thus, output current is much less
than the programmed current limit. Calculate the average
output current using the following equation:
THERMAL SHUTDOWN MODE
CURRENT LIMIT
LOAD CURRENT
DEVICE GOES TO
THERMAL SHUTDOWN MODE
t
BLANK
I
= I
LIM
LOAD
FLAG
(OR FWD)
t
+ t
RETRY
BLANK
With a 40ms (typ) t
and 600ms (typ) t
, the
RETRY
BLANK
TIME
duty cycle is 6.25%, resulting in a 93.75% power reduc-
tion when compared to the switch being on the entire
time. Figure 3 depicts typical behavior in the autoretry
current-limit mode.
NOTE: TIMENOT INSCALE
Figure 4. Continuous Fault-Timing Diagram
AUTORETRY MODE
tRETRY
tBLANK
tRETRY
tBLANK
tBLANK
tRETRY
OUT
DEVICE COMES OUT OF
THERMAL SHUTDOWN MODE
CURRENT LIMIT
LOAD CURRENT
DEVICE GOES TO
THERMAL SHUTDOWN MODE
FLAG
(OR FWD)
TIME
NOTE: TIMENOT INSCALE
Figure 3. Autoretry Fault-Timing Diagram
Maxim Integrated
│ 15
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
device monitors the voltage difference between the OUT
and IN pins to determine whether the reverse current is
still present. Once the reverse current condition has been
removed, Q1 is turned back on and the FLAG (or REV)
Latch-Off Current Limit
In latch-off current-limit mode, when current through the
device reaches the current-limit threshold, the t
timer begins counting. The FLAG (or FWD) pin asserts if
an overcurrent condition is present for t . The timer
resets when the overcurrent condition disappears before
BLANK
pin is deasserted. Q1 takes t
(~100μs) time to turn
Q1_ON
BLANK
on. Figure 6 depicts typical behavior in slow reverse cur-
rent conditions.
t
has elapsed. The switch turns off and stays off if
BLANK
the overcurrent condition continues beyond t
. To
A fast reverse-current condition is detected if (V - V
)
BLANK
IN
OUT
reset the switch, either toggle the control logic (EN) or
cycle the input voltage. Figure 5 depicts typical behavior
in latch-off current-limit mode.
< V
is present for reverse current blocking fast
RIBF
response time (t ). Only the input NFET (Q1) is turned
RIB
off and the FLAG (or REV) pin is asserted while the out-
put NFET (Q2) is kept on. During and after this time, the
device monitors the voltage difference between the OUT
and IN pins to determine whether the reverse current is
still present. Once the reverse current condition has been
removed, Q1 is turned back on and the FLAG (or REV)
pin is deasserted. Q1 takes t
turn on. Figure 7 depicts typical behavior in fast reverse-
current condition.
Reverse Current Protection
In MAX17608 and MAX17610, the reverse current-pro-
tection feature is enabled and it prevents reverse current
flow from OUT to IN pins. In MAX17609, the reverse cur-
rent-protection feature is disabled, which allows reverse
current flow from the OUT to IN pins. This feature is useful
in applications with inductive loads.
(~100μs) time to
Q1_ON
In MAX17608 and MAX17610 devices, two different
reverse-current features are implemented. Aslow reverse-
The device contains two reverse-current thresholds with
slow (< 140μs) and fast (< 150ns) response time for
reverse protection. The thresold values for slow reverse
is 11mV (typ) whereas for fast reverse, it is 105mV (typ).
This feature results in robust operation in a noisy environ-
ments, while still delivering fast protection for severe fault,
such as input short-circuit or hot plug-in at the OUT pins.
current condition is detected if (V - V
) < V
OUT
is
IN
RIBS
present for reverse current-blocking debounce blanking
time (t ). Only the input NFET (Q1) is turned off
DEBRIB
and the FLAG (or REV) pin is asserted while the output
NFET (Q2) is kept on. During and after this time, the
LATCH-OFF MODE
tBLANK
tDEB
tBLANK
OUT
CURRENT LIMIT
LOAD CURRENT
DEVICE GOES TO
THERMAL SHUTDOWN
MODE AND LATCHES OFF
DEVICE LATCHES OFF
FLAG
INPUT OR EN CYCLE
(OR FWD)
TIME
NOTE: TIMENOT INSCALE
Figure 5. Latch-Off Fault-Timing Diagram
Maxim Integrated
│ 16
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
tQ1_ON
tDEBRIB
tDEBRIP
(VIN-VOUT
)
0V
VRIBS
ILOAD
0A
-(VRIBS/RON
)
Q1 SWITCH
STATUS
FLAG
TIME
NOTE: TIME NOT IN SCALE
Figure 6. Slow Reverse-Current Fault-Timing Diagram
tQ1_ON
tDEBRIB
tRIB
(VIN-VOUT
)
0V
VRIBS
VRIBF
ILOAD
0A
-(VRIBS/RON
-(VRIBF/RON
)
)
Q1 SWITCH
STATUS
FLAG
TIME
NOTE: TIME NOT IN SCALE
Figure 7. Fast Reverse-Current Fault-Timing Diagram
Maxim Integrated
│ 17
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Fault Output
Applications Information
MAX17608 and MAX17609 devices have two open-drain
fault outputs, FLAG and UVOV. They require external pullup
resistors to a DC supply. The FLAG pin goes low when
any of the following conditions occur:
IN Capacitor
A 0.47μF capacitor from the IN pin to GND is recomended
to hold input voltage during sudden load-current changes.
Hot Plug-In at IN Terminal
● Overcurrent duration exceeds blanking time.
● Reverse current is detected (MAX17608 only).
● Thermal shutdown is active.
In many system powering applications, an input-filtering
capacitor is required to lower radiated emission and
enhance ESD capability. In hot plug-in applications,
parasitic cable inductance along with the input capacitor
causes overshoot and ringing when a live power cable is
connected to the input terminal.
● R
is less than 1kΩ (max).
SETI
The other fault output UVOV goes low when input voltage
falls below UVLO threshold or rises above OVLO thresh-
old. Note that the UVLO fault has a debounce time of
16ms. This fault is removed 16ms after input voltage has
crossed the UVLO threshold. This debounce also elapses
only at powerup. As a consequence, the UVOV pin fault
signal is always asserted at power-up for at least 16ms.
This effect causes the protection device to see almost
twice the applied voltage. A transient voltage suppressor
(TVS) is often used in industrial applications to protect
the system from these conditions. A TVS that is capable
of limiting surge voltage to maximum 60V shall be placed
close to the input terminal for enhanced protection. The
maximum tolerated slew rate at the IN pins is 100V/μs.
The MAX17610 device has two open-drain fault outputs,
FWD and REV. They require external pullup resistors to
a DC supply. FWD goes low when any of the following
conditions occur:
Input Hard Short to Ground
In many system applications, an input short-circuit protec-
tion is required. The MAX17608 and MAX17610 devices
detect reverse current entering at the OUT pin and flowing
out of the IN pin and turn off the internal FETs. The mag-
nitude of the reverse current depends on the inductance
of input circuitry and any capacitance installed near the
IN pins.
● Overcurrent duration exceeds the blanking time.
● Thermal shutdown is active.
● R
is less than 1kΩ (max).
SETI
REV goes low when reverse current is detected.
Thermal Shutdown Protection
The devices can be damaged in case V goes so nega-
IN
The devices have a thermal shutdown feature to protect
against overheating. The devices turn off and the FLAG
(or FWD) pin asserts when the junction temperature
exceeds +160°C (typ). The devices exit thermal shutdown
and resume normal operation after the junction tempera-
ture cools down by 28°C (typ), except when in latchoff
mode, the devices remain latched off.
tive that (V
- V ) > 60V.
OUT
IN
OUT Capacitor
Themaximumcapacitiveload(C )thatcanbeconnected
MAX
is a function of current-limit setting (I
in mA), the blank-
LIM
ing time (t
in ms) and the input voltage. C
is
BLANK
MAX
calculated using the following relationship:
The thermal limit behaves similarly to the current limit. In
autoretry mode, the thermal limit works with the autoretry
timer. When the junction temperature falls below the fall-
ing thermal-shutdown threshold, devices turn on after the
retry time. In latch-off mode, the devices latch off until
power or EN is cycled. In continuous mode, the devices
only disable while the temperature is over the limit. There
is no blanking time for thermal protection. Figure 3, Figure
4, and Figure 5 depict typical behavior under different cur-
rent limit modes.
I
(mA)× t
(ms)
BLANK(TYP)
LIM
C
(µF) =
MAX
V (V)
IN
For example, for V = 24V, t
= 40ms, and
IN
BLANK(TYP)
I
= 1A, C
is 1666μF.
LIM
MAX
Output capacitor values in excess of C
can trigger
MAX
false overcurrent conditions. Note that the above expres-
sion assumes no load current is drawn from the OUT pins.
Any load current drawn would offset the capacitor charg-
ing current resulting in a longer charging period; hence,
the possibility of a false overcurrent condition.
Maxim Integrated
│ 18
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Hot Plug-In at OUT Terminal
V
×I
× t
IN(MAX) OUT(MAX) BLANK
P
=
(MAX)
In some applications, there might be a possibility of apply-
ing an external voltage at the OUT terminal of the devices
with or without the presence of an input voltage. During
these conditions, devices detect any reverse current enter-
ing at the OUT pin and flowing out of the IN pin and turn
off the internal FETs. Parasitic cable inductance along
with input and output capacitors, cause overshoot and
ringing when an external voltage is applied at the OUT
terminal. This causes the protection devices to see up to
twice the applied voltage, which can damage the devices.
It is recommended to maintain overvoltages such that the
voltages at the pins do not exceed the absolute maximum
ratings. The maximum tolerated slew rate at OUT pins is
100V/μs.
t
+ t
BLANK
RETRY
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.
ESD Protection
All the pins have a ±2kV (HBM) typical ESD protection.
Figure 8 shows the HBM, and Figure 9 shows the current
waveform it generates when discharged into low imped-
ance. This model consists of a 100pF capacitor charged to
the ESD voltage of interest, which is then discharged into
the device through a 1.5kΩ resistor.
Output Freewheeling Diode for Inductive Hard
Short to Ground
In applications that require protection from a sudden short
to ground with an inductive load or a long cable, a schottky
diode between the OUT terminal and gro und is recom-
mended. This is to prevent a negative spike on the OUT
due to the inductive kickback during a short-circuit event.
RC
1MΩ
RD
1.5kΩ
CHARGE-CURRENT- DISCHARGE
LIMIT RESISTOR RESISTOR
HIGH-
VOLTAGE
DC
Layout and Thermal Dissipation
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
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 and OUT
must be connected with wide short traces to the power
bus. During normal operation, the power dissipation is
small and the package temperature change is minimal.
SOURCE
Figure 8. Human Body ESD Test Model
Power dissipation under steady-state normal operation is
calculated as:
IP 100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IR
2
P
= I
×R
(SS)
ON
OUT
AMPERES
36.8%
Refer to the Electrical Characteristics table and Typical
Operating Characteristics for R
values at various oper-
ON
ating temperatures.
10%
0
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.
Power dissipation in the devices operating in autoretry
mode is calculated using the following equation:
0
TIME
tDL
CURRENT WAVEFORM
tRL
Figure 9. Human Body Current Waveform
Maxim Integrated
│ 19
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MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Ordering Information
PART
TEMP RANGE
PIN PACKAGE
FEATURE DIFFERENCES
OV, UV, Reverse Voltage Protection
OV, UV
MAX17608ATC+T
MAX17609ATC+T
MAX17610ATC+T
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
12 TDFN-EP*
12 TDFN-EP*
12 TDFN-EP*
Reverse Voltage Protection
+Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
*EP = Exposed Pad
Maxim Integrated
│ 20
www.maximintegrated.com
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
12/17
Initial release
—
Updated title, General Description, Benefits and Features and Typical Operating
Characteristics sections, and Electrical Characteristics and Ordering Information
tables.
1
6/18
1–24
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.
2018 Maxim Integrated Products, Inc.
│ 21
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