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MAX14626

High-Voltage Reverse-Input-Capable 4–20mA

Current Loop Protector

�� Maxim Integrated Products 1

Typical Operating Circuit

19-6257; Rev 0; 3/12

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX14626.related.

EVALUATION KIT AVAILABLE

General Description

The MAX14626 current loop protector features a current-

limit switch to prevent damage to the sensor devices due

to faulty current loop conditions. The current-limit switch

features a 25I (typ) on-resistance and operates from a

+2.3V to +36V input voltage range. The accurate current

limit is set to 30mA, making the part ideal for protecting

the sensor reading devices.

The MAX14626 handles an overcurrent event in a con-

tinuous current-limit mode. Additional safety features

include thermal shutdown to prevent overheating and

reverse-input blocking to protect from being reverse con-

nected into the sensor.

The device is available in a tiny 6-pin (3mm x 3mm),

TDFN exposed pad package and is specified over the

-40NC to +85NC extended temperature range.

Applications

Industrial Current Loop Control

Benefits and Features

S High Performance

Low On-Resistance 25I (typ)

Accurate Q10% Current Limit

+2.3V to +40V Wide Supply Voltage Range

Low Operating Current

Ultra-Low Temperature Coefficient

S Robust Protection for Sensors

Avoids Power Dissipation Issues Compared to

Discrete Solutions

Thermal Shutdown

Reverse Input Protection

S Saves Space in Compact Systems

Eliminates Need for Discrete PTC Poly Switch,

Zener Diodes, and Resistors

3mm x 3mm, 6-Pin TDFN Package

REF SUPPLY

OUT

GND

ADC

LOAD

4–20mA CURRENT

SENSOR

(4–20mA)

CURRENT

CONTROL AND

PROTECTION

CURRENT LIMIT

GATE CONTROL

MAX14626

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (8 pages)

PAGE 1
9-6257; Rev 0; 3/12 EVALUATION KIT AVAILABLE MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector General Description Benefits and Features The MAX14626 current loop protector features a currentlimit switch to prevent damage to the sensor devices due to faulty current loop conditions. The current-limit switch features a 25I (typ) on-resistance and operates from a +2.3V to +36V input voltage range.
PAGE 2
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN to GND ...............................................................-40V to +40V OUT to GND ......................................................... -0.3V to +40V Current into IN................................................. Internally Limited Current into OUT...............................................................
PAGE 3
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector DC ELECTRICAL CHARACTERISTICS (continued) (IIN = 50FA to 24mA, TA = -40NC to +85NC, RLOAD = 25I to 1kI, unless otherwise noted. Typical values are at IIN = 10mA, RLOAD = 250I, and TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS THERMAL PROTECTION Thermal Shutdown Thermal-Shutdown Hysteresis +150 NC 20 NC Note 2: All devices are 100% production tested at TA = +25NC, unless otherwise noted.
PAGE 4
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector Typical Operating Characteristics (continued) (VIN = 24V, IIN = 10mA, RLOAD = 250I, unless otherwise noted. Typical values are at TA = +25NC.) ON-RESISTANCE vs. TEMPERATURE ON-RESISTANCE (I) 40 30 VIN = +5V VIN = +24V 20 VIN = +12V MAX14626 toc06 MAX14626 toc05 VIN = +2.36V 40 REVERSE CURRENT (nA) IOUT = 10mA IIN 0mA TO 20mA REVERSE CURRENT vs.
PAGE 5
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector GND I.C. TOP VIEW OUT Pin Configuration 6 5 4 MAX14626 *EP 2 3 I.C. IN 1 I.C. + TQFN *CONNECT EP TO GND Pin Description PIN NAME 1 IN Power Input FUNCTION 2, 3, 4 I.C. Internally Connected. Connect I.C. to GND. 5 GND Ground 6 OUT Switch Output — EP Exposed Pad. Connect EP to GND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point.
PAGE 6
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector Functional Diagram MAX14626 IN REF SUPPLY OUT CONTROL AND PROTECTION CURRENT LIMIT GATE CONTROL GND Detailed Description Thermal Shutdown The MAX14626 current loop protector features a currentlimit switch to prevent damage to the sensor devices due to faulty current loop conditions. The current-limit switch features a 25I (typ) on-resistance and operates from a +2.3V to +36V input voltage range.
PAGE 7
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector VOLTAGE SPIKE AND RF SUPRESSION SENSOR (4–20mA) CURRENT +INPUT MAX14626 RLOAD = 250I IA ADC IA ADC -INPUT ANALOG INPUT MODULE + DC SUPPLY 19.2V TO 32V CURRENT LOOP - VOLTAGE SPIKE AND RF SUPRESSION +INPUT MAX14626 RLOAD = 250I -INPUT ANALOG INPUT MODULE Figure 1.
PAGE 8
MAX14626 High-Voltage Reverse-Input-Capable 4–20mA Current Loop Protector Revision History REVISION NUMBER REVISION DATE 0 3/12 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.