Datasheet

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Adjustable Overvoltage and Overcurrent

Protectors with High Accuracy

MAX14571/MAX14572/MAX14573

EVALUATION KIT AVAILABLE

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.

19-6470; Rev 2; 1/15

Typical Operating Circuit

General Description

The MAX14571/MAX14572/MAX14573 adjustable over-

voltage- and overcurrent-protection devices are ideal

to protect systems against positive and negative input

voltage faults up to Q40V and feature low 100mI (typ)

FETs.

The overvoltage-protector (OVP) feature protects voltages

between 6V and 36V, while the undervoltage-protector

(UVP) feature protects voltages 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 19.2V (typ).

The ICs also feature programmable current-limit protec-

tion up to 4.2A. Once current reaches the threshold,

the MAX14571 turns off after the 20.7ms (typ) blanking

time and stays off during the retry period. The MAX14572

latches off after the blanking time, and the MAX14573

limits the current continuously. In addition, these devices

feature reverse current and thermal-shutdown protection.

The ICs are available in a small 14-pin TSSOP (5mm x

6.5mm) package and are specified over the extended

-40NC to +85NC temperature range.

Applications

Industrial Equipment

Consumer Electronics

Marine Equipment

Battery-Powered Applications

Benefits and Features

S Integrated Protection Increases System Reliability

Adjustable OVLO and UVLO Thresholds

(±3% Accurate Preset Thresholds)

Automatic Internal and External Selection

Programmable Forward Current Limit

(Adjustable Up to 4.2A) with ±15% Accuracy

Thermal-Shutdown Protection

100mW (typ) On-Resistance FET

S Special Features Facilitate Designs for Industrial

Applications

Wide 4.5V to 36V Operating Input Range

Reverse-Current Flow Option for Inductive Loads

Independent Microprocessor Enable Input (EN)

and High-Voltage-Capable Input (HVEN)

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

Ordering Information

UVLO

OVLO

SET1

OUT

PULLUP

OUT

RIEN

GND

R2R4

SYSTEM

INPUT

NOTE: R1, R2, R3, AND R4 ARE ONLY REQUIRED FOR ADJUSTABLE

OVLO/UVLO; OTHERWISE, CONNECT UVLO/OVLO TO GND.

SYSTEM

POWER

OUT

FLAG

HVEN

MAX14571

MAX14572

MAX14573

PART

TEMP

RANGE

PIN-

PACKAGE

OVERCURRENT

PROTECTION

MAX14571EUD+T

-40NC to

+85NC

14 TSSOP-

EP*

Autoretry

MAX14572EUD+T

-40NC to

+85NC

14 TSSOP-

EP*

Latchoff

MAX14573EUD+T

-40NC to

+85NC

14 TSSOP-

EP*

Continuous

Summary of content (14 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy General Description Benefits and Features The MAX14571/MAX14572/MAX14573 adjustable overvoltage- and overcurrent-protection devices are ideal to protect systems against positive and negative input voltage faults up to Q40V and feature low 100mI (typ) RON FETs.
PAGE 2
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN, HVEN.................................................................-40V to +40V IN to OUT................................................................-40V to +40V OUT .......................................................................-0.3V to +40V OVLO, UVLO, FLAG, EN, RIEN.............................-0.3V to +6.
PAGE 3
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy ELECTRICAL CHARACTERISTICS (continued) (VIN = 4.5V to 36V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VIN = 24V, RISET. = 12kI, TA = +25°C.
PAGE 4
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy ELECTRICAL CHARACTERISTICS (continued) (VIN = 4.5V to 36V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VIN = 24V, RISET. = 12kI, TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ESD PROTECTION Human Body Model, IN bypassed to GND with a 1FF low-ESR ceramic capacitor IN Q15 kV Note 3: All units are 100% production tested at TA = +25NC.
PAGE 5
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Timing Diagrams (continued) LATCH VERSION tBLANK tBLANK OUT CURRENT LIMIT LOAD CURRENT THE DEVICE GOES TO THERMAL SHUTDOWN MODE THE DEVICE COMES OUT OF THERMAL SHUTDOWN MODE INPUT OR EN CYCLE FLAG NOTE: TIME NOT IN SCALE Figure 2.
PAGE 6
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Timing Diagrams (continued) < tDEB < tDEB tDEB UVLO THRESHOLD VIN ON OFF SWITCH STATUS NOTE: TIME NOT IN SCALE Figure 4. Debounce Timing Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) IN SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = +85°C 0.5 0.4 0.3 TA = +25°C 0.2 0.7 0.6 0.5 0.4 0.3 0.2 TA = -40°C 0.1 0.
PAGE 7
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 1.1 1.0 0.9 0.8 0.7 0.6 -15 10 35 60 1.00 0.98 0.96 0.94 85 8 MAX14571 toc06 1.04 1.02 1.00 0.98 0.96 0.94 0.92 RSETI = 17.4kI 5 1.06 VIN = +24V 0.90 11 14 17 20 23 26 29 32 35 -40 -15 10 35 60 TEMPERATURE (°C) NORMALIZED OVLO THRESHOLD vs. TEMPERATURE NORMALIZED UVLO THRESHOLD vs.
PAGE 8
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Pin Configuration TOP VIEW IN 1 IN 2 IN 3 UVLO 4 OVLO 5 SETI 6 GND 7 + 14 OUT 13 OUT 12 OUT MAX14571 MAX14572 MAX14573 11 FLAG 10 EN *EP 9 RIEN 8 HVEN TSSOP *CONNECT EXPOSED PAD TO GND Pin Description PIN NAME 1, 2, 3 IN 4 UVLO Externally Programmable Undervoltage-Lockout Threshold. Connect UVLO to GND to use the default internal UVLO threshold.
PAGE 9
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Functional Diagram MAX14571 MAX14572 MAX14573 IN OUT OUT IN OUT REVERSE-INPUT REVERSE-CURRENT PROTECTION IN RIEN FLAG N CONTROL LOGIC VBG EN UVLO HVEN VSEL THERMAL SHUTDOWN OVLO VSEL SETI Maxim Integrated GND 9
PAGE 10
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Detailed Description The MAX14571/MAX14572/MAX14573 are adjustable overvoltage- and overcurrent-protection devices designed to protect systems against positive and negative input voltage faults up to Q40V, and feature low 100mI (typ) on-resistance FETs. 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.
PAGE 11
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Thermal-Shutdown Protection The devices have a thermal-shutdown feature to protect them from overheating. The devices turn off and the FLAG asserts when the junction temperature exceeds +150NC (typ). The devices exit thermal shutdown and resume normal operation after the junction temperature cools by 30NC (typ), except for the MAX14572, which remains latched off.
PAGE 12
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy OUT Bypass Capacitor For stable operation over the full temperature range and over the entire programmable current-limit range, connect a 1FF ceramic capacitor from OUT to ground. Excessive output capacitance can cause a false overcurrent condition due to decreased dV/dt across the capacitor.
PAGE 13
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Chip Information PROCESS: BiCMOS Maxim Integrated 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.
PAGE 14
MAX14571/MAX14572/MAX14573 Adjustable Overvoltage and Overcurrent Protectors with High Accuracy Revision History REVISION NUMBER REVISION DATE 0 9/12 Initial release 1 12/12 Removed future product asterisk and notes for the MAX14571/MAX14573, style edits. 2 1/15 Updated Benefits and Features section DESCRIPTION PAGES CHANGED — 1–6, 8, 10, 11, 14 1 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product.