MAX14838 [MAXIM]
24V Pin-Configurable Industrial Sensor Output Drivers;
| 型号： | MAX14838 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 24V Pin-Configurable Industrial Sensor Output Drivers |
| 文件： | 总16页 (文件大小：1151K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
General Description
The MAX14838/MAX14839 24V/100mA drivers are
optimized for use in industrial sensors. These devices
integrate all of the high-voltage (24V) circuitry commonly
found in industrial sensors, including a configurable PNP/
NPN/push-pull driver and an integrated linear regulator
that meets common sensor power requirements.
Benefits and Features
● High Configurability Simplifies Design
• Pin-Selectable High-Side (PNP), Low-Side (NPN),
or Push-Pull Driver
• Pin-Configurable NO/NC Logic
● Integrated Protection Provides Robust Sensor
Solutions
The MAX14838/MAX14839 are pin-configurable. Logic
inputs allow the driver to be configured for high-side
(PNP), low-side (NPN), or push-pull operation. An
additional input allows the user to select between normal-
ly-open and normally-closed logic.
• Reverse-Polarity Protection on DO, V , and GND
• 4.75V to 34V Supply Range (MAX14839)
• Driver is Short-Circuit Protected
CC
• FAULT Output for Fault Indication
• V
Hot Plug Protection
The MAX14838 features an onboard 5V linear regulator,
while the MAX14839 features a 3.3V linear regulator.
CC
• Thermal Shutdown Protection
• ±1kV/500Ω Surge Protection
Each device includes two LED drivers for visual feedback.
One LED driver reflects the output logic status and the
other is a general-purpose driver that can be used to
signal a fault condition.
• ±8kV IEC 61000-4-2 Air Gap ESD Protection
• ±6kV IEC 61000-4-2 Contact ESD Protection
• -40°C to +105°C Temperature Range
● Fast Turn-Off of Inductive Loads Up to 1.5H
The DO output, supply (V ), and ground (GND) pins are
CC
reverse polarity-protected and are protected against IEC
● Saves Space on Board
• Available in 12-Pin TDFN-EP (3mm x 3mm) or
12-Bump WLP (2.1mm x 1.6mm)
• Dual Integrated 2mA LED Drivers
ESD and surge events.
The MAX14838 and MAX14839 operate from a wide sup-
ply range and are available in a 12-pin TDFN-EP package
(3mm x 3mm) or a 12-bump wafer-level package (WLP)
(2.1mm x 1.6mm) and operate over the -40°C to +105°C
temperature range.
Applications
● Industry Binary Sensors
● Proximity Switches
● Capacitive and Inductive Sensors
Ordering Information appears at end of data sheet.
Typical Application Circuit
LED2
LEDS
LDO
24V
V
CC
100nF
100nF
10nF
FAULT
DO
SENSOR
AFE
OUT
GND
LED2IN
DIN
MAX14838
MAX14839
NPN
PP
GND
NO
19-7465; Rev 3; 10/18
MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Absolute Maximum Ratings
(All voltages referenced to GND, unless otherwise specified.)
Continuous Power Dissipation (T = +70°C)
A
V
.........................................................................-36V to +36V
Multiple-Layer Board
CC
LDO .........................................................................-0.3V to +6V
DO Higher of (V - 36V) and -36V
(derate at 24.4mW/°C above +70°C) ........................1950mW
Operating Temperature Range......................... -40°C to +105°C
Junction Temperature......................................................+150ºC
Storage Temperature Range.............................-65ºC to +150°C
Solder Temperature (Reflow) .........................................+260°C
...........................................................
CC
Lower of (V
+ 36V) and +36V
CC
DIN, NPN, PP, NO, LDO2IN, FAULT.......................-0.3V to +6V
LEDS, LED2....... -0.3V to the higher of (V - 0.3V) and +0.3V
CC
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+1
21-0664
90-0397
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θ
)
41°C/W
8.5°C/W
JA
Junction to Case (θ
)
JC
PACKAGE TYPE: 12 WLP
Package Code
W121C2+1
Outline Number
21-0009
Land Pattern Number
Refer to Application Note 1891
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θ
)
62°C/W
JA
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.
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Electrical Characteristics
(V
= 4.75V to 34V (MAX14839), V
= 7V to 34V (MAX14838), unless otherwise noted. V
= 0V. All logic inputs are V or
LDO
CC
GND. T = T
CC
GND
to T
. Typical values are at V
= 24V, T = +25°C) (Notes 1, 2)
A
MIN
MAX
CC
A
PARAMETER
POWER SUPPLY
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX14839
MAX14838
4.75
7
34
34
Supply Voltage
Supply Current
V
V
CC
V
= 24V, no external load on LDO,
CC
I
DO is open-drain or push-pull mode, no
1.2
mA
CC
load on DO, LEDS, and LED2 off
MAX14839
MAX14838
4.1
6.0
4.7
7.0
V
active
rising to DO
Power-On Reset (POR)
Threshold
POR Threshold Hysteresis
CC
V
V
V
TH
V
0.5
HTH
DRIVER (DO)
V
1.7
-
CC
Output Voltage High
V
High-side on, I
= -100mA,
= 100mA,
V
OH
DO
Output Voltage Low
V
Low-side on, I
(Note 3)
1.7
V
OL
DO
Current Protection Threshold
|I
|
120
145
350
20
170
mA
OC
|I
|
Current Limit
CL
(Note 3)
mA
DO Weak Pulldown Current in
PNP Mode
PNP configuration, high-side off,
= V -1V, V = 34V
I
10
35
μA
LDO_HS
V
DO
CC
CC
DO Weak Pullup Current in
NPN mode
I
NPN mode, low-side off, V
= 0V
DO
-35
-20
-10
μA
LDO_LS
DO Leakage Current in NPN
Mode
V
= 24V, V
= 34V, DO is high
CC
DO
I
DO_LEAK
200
μA
impedance
DO Output Negative Clamp
Voltage
PNP mode, 100mA clamp current flow-
ing into DO
V
-
CC
42
V
V
CLN
CLP
DO Output Positive Clamp
Voltage
PNP mode, 100mA clamp current flow-
ing into DO
V
42
V
LOGIC INPUT SIGNALS (DIN, NPN, NO, PP, LED2IN)
Input Logic-High Voltage
V
2.0
V
V
IH
Input Logic-Low Voltage
V
0.8
+1
15
IL
Input Leakage Current
I
DIN, NPN, NO, PP, V = 0V or 5.5V
-1
5
μA
μA
IL
IN
LED2IN Input Pull-Up Current
LOGIC OUTPUT SIGNAL (FAULT)
FAULT Output Low Voltage
I
V
= 0V
10
PU
LED2IN
V
I
I
= 1mA
0.4
+1
V
OL
FAULT
V
= 0V or 5.5V, FAULT is three-
FAULT
FAULT Output Leakage
-1
μA
OL
stated
LED DRIVER OUTPUTS (LEDS, LED2)
LED Current Source
I
LEDS, LED2 on, V
V = 4V
LEDS/ LED2
1.7
2
2.3
mA
LED
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
AC Electrical Characteristics
(V
= 4.75V to 34V (MAX14839), V
= 7V to 34V (MAX14838), unless otherwise noted. V
= 0V. All logic inputs are V or
LDO
CC
GND. T = T
CC
GND
to T
. Typical values are at V
= 24V, T = +25°C) (Notes 1, 2)
A
MIN
MAX
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LINEAR REGULATOR (LDO)
MAX14839, 4.75V ≤V
≤ 34V,
CC
3.0
3.3
5.0
3.6
5.5
I
= 30mA
LDO
V
V
Output Voltage
LDO
MAX14838, 7V ≤V
≤ 34V,
CC
4.5
30
I
= 30mA
LDO
Short Circuit Current Limit
Line Regulation
I
LDO short to GND
= 30mA
45
mA
%
LDO_SC
I
0.06
LDO
0.1mA ≤ I
capacitor on LDO
≤ 30mA, 100nF bypass
LOAD
Load Regulation
2.8
Ω
PROTECTION
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
T
Temperature rising, FAULT asserted
+150
10
°C
°C
kV
kV
kV
kV
mA
SHDN
T
SHDN_HYST
Air-Gap Discharge, IEC 61000-4-2
Contact Discharge IEC 61000-4-2
Human Body Model, JESD22-A114E
IEC 61000-4-5, 0.5μF/500Ω
±8
ESD Protection
(V , DO, and GND) (Note 4)
CC
±6
ESD Protection (All Other Pins)
Surge Tolerance
±2
±1
Reverse Polarity Current
POWER-ON RESET TIMING
I
Any combination of V , DO, and GND
CC
-1
+1
RP
Delay after V
DO is active
rises above V until
TH
CC
POR Delay
t
75
80
100
ms
PUD
DRIVER TIMING
V
= 34V, C = 1nF, R = 10kΩ,
L L
CC
Low-to-High Propagation Delay
High-to-Low Propagation Delay
t
push-pull or PNP mode, 50% to 50%,
Figure 1
5
5
20
20
μs
μs
PLH
V
= 34V, C = 1nF, R = 10kΩ,
L L
CC
t
push-pull or NPN mode, 50% to 50%,
PHL
Figure 1
V
= 34V, C = 1nF, R = 10kΩ, push-
L L
CC
DO Output Rise Time
DO Output Fall Time
t
6
6
20
20
μs
μs
RISE
pull or PNP mode, 10% to 90%
V
= 34V, C = 1nF, R = 10kΩ, push-
CC
L
L
t
FALL
pull on NPN mode, 90% to 10%
OVERCURRENT SHUTDOWN TIMING
Overcurrent Detection Time
t
t
(Note 3)
(Note 3)
112
150
5.0
μs
ISDET
Overcurrent Turn-Off Time
3.75
ms
ISOFF
Note 1: All units are production tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: Currents into the device as positive; all currents out of the device are negative. All voltages are referenced to ground, unless
otherwise noted.
Note 3: See the DO Short-Circuit and Overcurrent Protection section for detailed information.
Note 4: ESD protection for V
is achieved only with an external capacitor connected from V
to GND. Connect 100nF capacitor
CC
CC
between V
and GND for air-gap and contact discharge ESD.
CC
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Test Circuits/Timing Diagrams
5V
DIN
0V
MAX14838
MAX14839
50Ω
tPHL
tPLH
DIN
DO
VCC
RL
CL
GND
DO
0V
MAX14838/MAX14839
IN HIGH-SIDE OR PUSH-PULL MODE
Figure 1. Propagation Delay Timing (NPN, PNP, or Push-Pull Mode)
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Typical Operating Characteristics
(V
= 24V, T = +25°C, unless otherwise noted.)
A
CC
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DIN LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
LDO OUTPUT VOLTAGE
vs. LOAD CURRENT
toc02
toc01
toc03
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
3.0
101
100
99
NO LOAD ON LDO AND DO
LEDS AND LED2 ARE OFF
NO SWITCHING ON DO
REFERENCED TO ILOAD = 0mA
2.5
2.0
1.5
1.0
0.5
0.0
RISING
MAX14838, VLDO = 5V
MAX14838
MAX14839
FALLING
MAX14839, VLDO = 3.3V
98
97
4.75
10.60
16.45
22.30
28.15
34.00
4.75
10.60
16.45
22.30
28.15
34.00
0
10
20
30
SUPPLY VOLTAGE (V)
SUPPY VOLTAGE (V)
LOAD CURRENT (mA)
LDO OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
LDO LOAD TRANSIENT
RESPONSE
toc05
toc04
100.50
NORMALIZED TO VCC = 24V
ILOAD = 30mA
VLDO
100mV/div
(AC-
COUPLED)
100.25
100.00
99.75
MAX14838, VLDO = 5V
ILDO
20mA/div
MAX14839, VLDO = 3.3V
99.50
40ms/div
4.75
10.60
16.45
22.30
28.15
34.00
SUPPLY VOLTAGE (V)
DO SHORT CIRCUIT TO
GROUND RESPONSE
LDO SHORT CIRCUIT CURRENT
vs. SUPPLY VOLTAGE
toc07
toc06
100
90
80
70
60
50
40
30
20
10
0
MAX14838, VLDO = 5V
VDO
10V/div
MAX14839, VLDO = 3.3V
IDO
200mA/div
4.75
10.60
16.45
22.30
28.15
34.00
4ms/div
SUPPLY VOLTAGE (V)
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Typical Operating Characteristics
(V
= 24V, T = +25°C, unless otherwise noted.)
A
CC
DO OUTPUT VOLTAGE
vs. LOADCURRENT
DO OUTPUT VOLTAGE
vs. SINK CURRENT
toc08
toc09
25
5
HIGH-SIDE ON
LOW-SIDE ON
24
23
4
3
2
1
0
22
21
20
0
20
40
60
80
100
0
20
40
60
80
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
DO CURRENT PROTECTION
DO CURRENT PROTECTION
THRESHOLD vs. SUPPLY VOLTAGE
THRESHOLD vs. SUPPLY VOLTAGE
toc10
toc11
200
180
160
140
120
100
80
200
180
160
140
120
100
80
HIGH-SIDE ON
LOW-SIDE ON
60
60
40
40
20
20
0
0
4.75
10.60
16.45
22.30
28.15
34.00
4.75
10.60
16.45
22.30
28.15
34.00
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INDUCTIVE DEMAGNETIZATION
RESPONSE
POR TIMING
toc12
toc13
VCC
10V/div
+42.2V
VDO
20V/div
DO
10V/div
LDO
5V/div
IDO
100mA/div
20ms/div
10ms/div
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Typical Operating Characteristics
(V
= 24V, T = +25°C, unless otherwise noted.)
A
DD
DO LEAKAGE
vs. DO VOLTAGE
INDUCTIVE DEMAGNETIZATION
RESPONSE
toc15
toc14
200
190
180
170
160
150
140
130
120
110
100
VCC = 10V
NPN mode
VDO
20V/div
-18.0V
IDO
100mA/div
10
14
18
22
26
30
34
100nF
DO VOLTAGE (V)
DO LEAKAGE CURRENT
vs TEMPERATURE
DO LEAKAGE CURRENT
vs TEMPERATURE
toc16
toc17
200
190
180
170
160
150
140
130
120
110
100
200
190
180
170
160
150
140
130
120
110
100
NPN MODE, NPN DISABLED
VCC = VDO = 34V
NPN MODE, NPN DISABLED
CC = 24V
DO = 34V
V
V
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
DO LEAKAGE CURRENT
vs TEMPERATURE
toc18
200
190
180
170
160
150
140
130
120
110
100
PUSH-PULL MODE WITH OUTPUT HIGH
VCC = VDO = 34V
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Pin Configuration
TOP VIEW
MAX14838
MAX14839
12
11
10
9
8
7
1
2
3
4
+
VCC
LEDS
LDO
LED2IN
NO
PP
A
B
C
MAX14838
MAX14839
DO
LED2
DIN
NPN
GND
FAULT
+
1
2
3
4
5
6
TDFN
(3mm x 3mm)
12-WLP
(2.1mm x 1.6mm)
Pin Description
PIN
NAME
FUNCTION
to GND with a 100nF capacitor as close as possible to the IC.
TDFN
WLP
1
A1
V
Power Supply Input. Bypass V
CC
CC
Linear Regulator Output. V
LDO to GND with a 100nF capacitor as close as possible to the IC.
is 5V for the MAX14838. V
is 3.3V for the MAX14839. Bypass
LDO
LDO
2
3
4
A3
B2
A2
LDO
LED2 Driver Output. Connect LED2 to the anode of an external general purpose LED. LED2 can be
left unconnected if not used. See the Truth Table for more information.
LED2
Status LED Driver Output. Connect LEDS to the anode of the status LED and the cathode of the
general LED. LEDS may be left unconnected if not used. See the Truth Table.
LEDS
5
6
A4
B4
PP
Driver Push-Pull Mode Select Input. See the Truth Table for more information.
Driver NPN or PNP Mode Select Input. See the Truth Table for more information.
NPN
LED2 Control Input. Drive LED2IN low to turn LED2 on. Drive LED2IN high to turn LED2 off. LED2IN
can be connected to FAULT.
7
8
B3
C4
LED2IN
FAULT
Open-Drain Fault Output. FAULT goes low when an overcurrent or short circuit-condition is detected
at DO or when the device is in thermal shutdown.
9
C3
C2
C1
NO
DIN
Driver Normally-Open/Normally-Closed Select Input. See the Truth Table for more information.
10
11
Driver Input. See the Truth Table for more information.
GND
Ground
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Pin Description (continued)
PIN
NAME
FUNCTION
TDFN
WLP
Driver Output. See the Truth Table for more information. Connect a 10nF capacitor between DO
and GND.
B1
DO
EP
12
Exposed Pad. Available on TDFN package only. Connect exposed pad to GND. Not intended as the
main ground connection.
—
—
Truth Table
INPUTS
OPERATION
DO STATUS
ON (High)
NO
PP
NPN
L
DIN
L
MODE
PNP NC
LEDS
ON
L
L
L
L
H
L
PNP NC
OFF (High Impedance)
ON (Low)
OFF
ON
L
L
H
H
L
NPN NC
L
L
L
H
L
NPN NC
OFF (High Impedance)
HIGH
OFF
ON
L
L
H
H
H
H
L
Push-Pull NH
Push-Pull NH
Push-Pull NL
Push-Pull NL
PNP NO
L
H
L
LOW
OFF
ON
L
H
H
L
LOW
L
H
L
HIGH
OFF
OFF
ON
H
H
H
H
H
H
H
H
OFF (High Impedance)
ON (High)
L
L
H
L
PNP NO
L
H
H
L
NPN NO
OFF (High Impedance)
ON (Low)
OFF
ON
L
H
L
NPN NO
H
H
H
H
Push-Pull NL
Push-Pull NL
Push-Pull NH
Push-Pull NH
LOW
OFF
ON
L
H
L
HIGH
H
H
HIGH
OFF
ON
H
LOW
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Functional Diagram
LDO
VCC
Protection
LDO
FAULT
POR
GND
DIN
NPN
PP
Driver Output
Protection
DO
Driver
NO
GND
LED
Driver
LED
Driver
LED2IN
MAX14838
MAX14839
LEDS
LED2
short circuits, and high ESD. These devices also feature
fast inductive demagnetization of GND-connected and
Detailed Description
The MAX14838/MAX14839 are 24V, 100mA drivers
for industrial binary sensors. These devices are pin-
programmable and integrate the common high-voltage
circuitry needed for industrial binary sensors into a single-
device solution. Integrated transient protection meets
the IEC 61000-4-5 standard and protects surges up to
±1kV/500Ω.
V
-connected inductive loads up to 1.5H.
CC
Overcurrent protection guards the MAX14838/MAX14839
from damage due to overheating during overcurrent fault
conditions. The FAULT output signals thermal overload
and overcurrents.
LDO Linear Regulator
The MAX14838/MAX14839 feature multiple configuration
options that are user-selected during operation. The
output of the device can be pin-configured for high-
side (PNP), low-side (NPN), or push-pull operation.
Additionally, the devices allow the user to configure
thelogic for sensors that are normally open (NO) or
normally closed (NC).
The MAX14838/MAX14839 feature an integrated linear
regulator to power external loads up to 30mA, suitable
for most common industrial sensors. The MAX14838
features a 5V LDO, while the MAX14839 features a 3.3V
LDO. During thermal shutdown, the regulator is turned off.
Power-On Reset (POR)
The MAX14838/MAX14839 includes a 95ms (max) POR
delay between the time the supply voltage exceeds the
POR threshold until the DO output is enabled. During the
POR delay, the DO output is high impedance and the LED
drivers (LEDs and LED2) are inactive.
The two integrated LED drivers in the MAX14838/
MAX14839 provide visual feedback of the state of the
sensor.
These devices deliver the robust design necessary in
industrial applications. The DO, V , and GND interface
CC
pins are protected against reverse-polarity connection,
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Fast Turn-Off of Inductive Loads
Reverse-Polarity Protection
The MAX14838/MAX14839 contain internal circuitry that
enables rapid demagnetization of inductive loads in
NPN or PNP modes. Inductive loads up to 1.5H can be
magnetized and demagnetized by the MAX14838/
MAX14839.
Reverse-polarity protection is built into the MAX14838/
MAX14839. Integrated circuitry protects the device
against accidental reverse-polarity connections to the
V
CC
, DO, and GND pins. During a reverse-polarity plugin
event, the maximum current drawn through V , DO, or
CC
GND is 1mA. The maximum voltage between any of the
In the case of an inductive load connected to GND
(Figure 2), the inductor is magnetized as DO is driven
high. When the DO output switches to the off state, there
is a consequential negative voltage kickback on the DO
pins must not exceed 36V
at any time.
DC
Voltage Transients
Short-duration voltage transients that rise above
the absolute maximum rating of the V pin occur
pin, which is shunted to V
by an internal clamp. The
CC
CC
demagnetization voltage across the load for a negative
voltage kickback event is |V - 42V| (typ). As the voltage
during ESD, burst, and hot plug events. The MAX14838/
MAX14839 cannot be damaged with a 100nF bypass
CC
supplied to V
increases, the demagnetization voltage
CC
capacitor on the V
line. Transients due to inductive
CC
across the inductor decreases. Consequently, the demag-
netization time increases with voltage supplied to V
kickback on DO when driving inductive loads up to 1.5H
at 100mA or less can also bring the DO voltage above the
absolute maximum rating, yet not damage the device. The
.
CC
Similarly, with a load connected to V
(Figure 3), the
CC
inductor is magnetized as DO is driven low. When the DO
output switches to the off state, there is a consequential
positive voltage kickback at the DO pin, which is shunted
to GND by an internal clamp. The demagnetization volt-
age across the load for a positive voltage kickback event
absolute maximum ratings for V
violated for any length of time by external sources.
and DO should not be
CC
Driver Output (DO)
The driver output of the MAX14838/MAX14839 is pin-
configurable for low-side, high-side, or push-pull opera-
tion. The driver output can also be configured as nomally
open or normally closed. See the Truth Table for details on
configuring the output mode.
is |V
- 42V| (typ).
CC
The equivalent clamping structure of the MAX14838/
MAX14839 for high-side mode is shown in Figure 2, and
the equivalent clamping structure for the device in low-
side mode is shown in Figure 3. As shown in the figures,
the minimum series load resistor can be calculated as
V
/100mA.
CC
VCC
V
CC
MAX14838
MAX14839
L
V
CL
DO
DO
R
R
V
CL
MAX14838
MAX14839
L
THE VOLTAGE ACROSS THE INDUCTOR IS
|V – V | DURING NEGATIVE KICKBACK
THE VOLTAGE ACROSS THE INDUCTOR IS
|V – V | DURING POSITIVE KICKBACK
CC CL
CC CL
Figure 2. High-Side Mode with Ground-Connected Load
Figure 3. Low-Side Mode with Supply-Connected Load
Maxim Integrated
│ 12
www.maximintegrated.com
MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Capacitive Loads
General Purpose LED Driver (LED2)
The MAX14838/MAX14839 are capable of driving capaci-
tive loads on the DO output. Assuming a pure capacitive
load without series/parallel resistance, the maximum
capacitance that can be charged can be calculated as:
LED2 is a general-purpose LED driver output. LED2IN is
the input for LED2. Pull LED2IN low to turn on the LED2
output.
To configure LED2 as a visual fault indicator, connect
C
= [I x t
]/ V
ISDET CC
LED2IN to FAULT.
LOAD
CL
Higher capacitive loads can be driven if a series resis-
tor is connected between the DO ouput and the load.
Output Driver State Indicator (LEDS)
The LEDS driver output signals the state of the DO driver.
LEDS sources current when one DO output transistor is
on in PNP or NPN mode. See Truth Table for more infor-
mation.
Capacitive loads can be connected to ground or V
.
CC
DO Short-Circuit and Overcurrent Protection
TheDOdriverloadcurrentisactivelylimitedtoI (350mA,
CL
typ). When the DO load current exceeds the current
Thermal Shutdown
protection threshold, I
(145mA, typ), for a duration lon-
OC
(130μs,typ), the DO driver is immediately
The MAX14838/MAX14839 includes integrated protec-
tion against thermal overload. When the die temperature
rises above +150°C (typ), the DO driver, LED drivers, and
the linear regulator automatically turn off until the die
temperature returns to a safe level.
ger than t
ISDET
turned off and enters autoretry mode. In autoretry mode,
DO is turned off for t (4ms, typ) and then powered
ISOFF
up for t
. If the short-circuit condition has not been
ISDET
removed,thecyclerepeats.Thedeviceturnsofffort
,
ISOFF
, reducing the overall power
Applications Information
then back on for t
dissipation at DO.
ISDET
Burst Protection
To improve false transitions during burst testing and
LED Output Drivers
The MAX14838/MAX14839 allow the user to receive
visual feedback of the state of the sensor using two LED
driver outputs, LEDS and LED2. The LED drivers protect
onboard LEDs against possible reverse-polarity connec-
conducted radiation susceptability testing, connect
a
10nF capacitor between DO and V
between DO and GND.
and another
CC
Extended ESD Protection
tions on the V
supply.
CC
ESD-protection structures are incorporated on all pins to
protect against electrostatic discharges up to ±2kV (HBM)
If LEDS and LED2 are used, connect as shown in the
Typical Application Circuit. When using a low supply
voltage, ensure that the sum of the two LED’s forward-
voltage is less than 4V.
encountered during handling and assembly. V , DO,
CC
and GND are further protected against ESD up to ±12kV
(Air-Gap Discharge), and ±8kV (Contact Discharge)
without damage. The ESD structures withstand high ESD
both in normal operation and when the device is powered
down. After an ESD event, the devices continue to
function without latchup.
If only LEDS is used, leave LED2IN and LED2 uncon-
nected. If only LED2 is used, connect LEDS to ground.
Maxim Integrated
│ 13
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MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
ESD Test Conditions
IEC 61000-4-2
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
methodology and test results.
The IEC 61000-4-2 standard covers ESD testing and per-
formance of finished equipment. It does not specifically
refer to integrated circuits. The major difference between
tests done using the HBM and IEC 61000-4-2 is higher
peak current in IEC 61000-4-2, because series resistance
is lower in the IEC 61000-4-2 model. Hence, the ESD
withstand voltage measured to IEC 61000-4-2 is gener-
ally lower than that measured using the HBM. Figure 6
shows the IEC 61000-4-2 model and Figure 7 shows the
current waveform for the ±8kV, IEC 61000-4-2, Level 4,
ESD Contact-Discharge Method.
Human Body Model
Figure 4 shows the Human Body Model. Figure 5 shows
the current waveform it generates when discharged
into a low impedance. This model consists of a 100pF
capacitor charged to the ESD voltage of interest that is
then discharged into the device through a 1.5kΩ resistor.
R
C
R
D
R
R
D
C
1MΩ
1.5kΩ
50MΩ TO 100MΩ
330Ω
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
C
100pF
STORAGE
CAPACITOR
C
150pF
STORAGE
CAPACITOR
S
S
SOURCE
SOURCE
Figure 4. Human Body ESD Test Model
Figure 6. IEC 61000-4-2 ESD Test Model
I
(AMPS)
PEAK
I
(AMPS)
PEAK
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
100%
90%
r
36.8%
10%
10%
0
t
TIME
0
t
R
= 0.7ns TO 1ns
t
RL
30ns
t
DL
60ns
Figure 5. Human Body Current Waveform
Figure 7. IEC 61000-4-2 ESD Generator Current Waveform
Maxim Integrated
│ 14
www.maximintegrated.com
MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Typical Application Circuit
LED2
LEDS
LDO
V
24V
CC
100nF
100nF
FAULT
DO
OUT
10nF
SENSOR
AFE
LED2IN
DIN
MAX14838
MAX14839
MCU
NPN
PP
GND
GND
NO
Ordering Information
Chip Information
PROCESS: BiCMOS
LDO
PART
TEMP
RANGE
PIN-
PACKAGE
VOLTAGE
-40°C to
+105°C
12 TDFN-
EP
MAX14838GTC+
MAX14838GWC+
MAX14839GTC+
MAX14839GWC+
5V
5V
-40°C to
+105°C
12-bump
WLP
-40°C to
+105°C
12-TDFN-
EP
3.3V
3.3V
-40°C to
+105C
12-bump
WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad
Maxim Integrated
│ 15
www.maximintegrated.com
MAX14838/MAX14839
24V Pin-Configurable Industrial Sensor
Output Drivers
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
12/14
2/15
0
1
2
Initial release
Updated V
—
2
and V limits
OH
OL
6/15
Updated TOC08 in the Typical Operating Characteristics section
7
Updated the Typical Application Circuits, Pin Description table, and Burst Protection
section
1, 10
13, 15
3
10/18
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
│ 16
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