MAX16128 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Load-Dump/Reverse-Voltage Protection Circuits

MAX16128/MAX16129
Load-Dump/Reverse-Voltage Protection Circuits
General Description
The MAX16128/MAX16129 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 external
back-to-back n-channel MOSFETs that turn off and iso-
late 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 that ensures proper operation during automotive
cold-crank conditions. These devices feature a flag out-
put (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 devices use fixed overvoltage and undervoltage
thresholds, minimizing the external component count.
The MAX16129 provides limiter-mode fault management
for overvoltage and thermal-shutdown conditions; where-
as the MAX16128 provides switch-mode fault manage-
ment for overvoltage and thermal shutdown conditions.
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 MAX16128/MAX16129 are available in an 8-pin
FMAX^M package and operate over the automotive tem-
perature range (-40NC to +125NC).
Applications
Automotive
Industrial
Avionics
Telecom/Server/Networking
Features
S Operates Down to +3V, Riding Out Cold-Crank
Conditions
S -36V 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 Fixed Undervoltage/Overvoltage Thresholds
S Thermal Shutdown Protection
S Low Supply Current and Low Shutdown Current
S Internal Charge-Pump Circuit Enhances External
n-Channel MOSFET
S FLAG Output Identifies Fault Condition
S Automotive Qualified
S -40NC to +125NC Operating Temperature Range
S Available in 3mm x 3mm, 8-Pin µMAX Package
Ordering Information appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6146; Rev 1; 9/12