MAX16126 Datasheet, PDF(1/19 Page) Maxim Integrated Products – Load-Dump/Reverse-Voltage Protection Circuits

19-6053; Rev 0; 11/11

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

General Description

The MAX16126/MAX16127 load-dump/reverse-voltage

protection circuits protect power supplies from dam-

aging input voltage conditions, including overvoltage,

reverse-voltage, and high-voltage transient pulses. Using

a built-in charge pump, the devices control two exter-

nal back-to-back n-channel MOSFETs that turn off and

isolate downstream power supplies during damaging

input conditions, such as an automotive load-dump pulse

or a reverse-battery condition. Operation is guaranteed

down to 3V to ensure proper operation during automo-

tive cold-crank conditions. These devices feature a flag

output (FLAG) that asserts during fault conditions.

For reverse-voltage protection, external back-to-back

MOSFETs outperform the traditional reverse-battery

diode, minimizing the voltage drop and power dissipa-

tion during normal operation.

The MAX16126/MAX16127 use external resistors to

adjust the overvoltage and undervoltage comparator

thresholds for maximum flexibility.

The MAX16127 provides limiter-mode fault manage-

ment for overvoltage and thermal shutdown conditions;

whereas the MAX16126 provides switch-mode fault

management for overvoltage and thermal shutdown con-

ditions. In the limiter mode, the output voltage is limited

and FLAG is asserted low during a fault. In the switch

mode, the external MOSFETs are switched off and FLAG

is asserted low after a fault. The switch mode is available

in four options: latch mode, 1 autoretry mode, 3 autoretry

mode, and always autoretry mode.

The MAX16126/MAX16127 are available in 12-pin TQFN

packages. These devices operate over the automotive

temperature range (-40NC to +125NC).

Applications

Automotive

Industrial

Avionics

Telecom/Server/Networking

Benefits and Features

S Operates Down to +3V, Riding Out Cold-Crank

Conditions

S -30V to +90V Wide Input Voltage Protection Range

S Minimal Operating Voltage Drop Reverse-Voltage

Protection

S Fast Gate Shutoff During Fault Conditions with

Complete Load Isolation

S Adjustable Undervoltage/Overvoltage Thresholds

S Thermal Shutdown Protection

S Low Supply Current and Low Shutdown Current

S Charge-Pump Circuit Enhances External

n-Channel MOSFETs

S FLAG Output Identifies Fault Condition

S Automotive Qualified

S -40NC to +125NC Operating Temperature Range

S Available in 3mm x 3mm, 12-Pin TQFN Package

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/MAX16126.related.

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

or visit Maximâs website at www.maxim-ic.com.

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