MAX14721/
MAX14722/
MAX14723
High-Accuracy, Adjustable Power Limiter
General Description
Benefits and Features
The MAX14721–MAX14723 adjustable overvoltage,
undervoltage, and overcurrent protection devices guard
systems against overcurrent faults in addition to positive
overvoltage and reverse-voltage faults. When used with
an optional external p-channel MOSFET, the devices also
protect downstream circuitry from voltage faults up to
+60V, -60V (for -60V external pFET rating). The devices
feature a low, 76mΩ, on-resistance integrated FET.
During startup, the devices are designed to charge large
capacitances on the output in a continuous mode for
applications where large reservoir capacitors are used
on the inputs to downstream devices. Additionally, the
MAX14721–MAX14723 feature a dual-stage, current-limit
mode in which the current is continuously limited to 1x,
1.5x, and 2x the programmed limit, respectively, for a
short time after startup. This enables faster charging of
large loads during startup.
● Robust, High-Power Protection Reduces System
Downtime
• Wide Input Supply Range: +5.5V to +60V
• Programmable Input Supply Overvoltage Setting
Up to 40V
• Thermal Foldback Current-Limit Protection
• Negative Input Tolerance to -60V (for -60V External
pFET Rating)
• Low 76mΩ (typ) R
ON
• Reverse Current-Blocking Protection with External
pFET
● Enables Safer Startup By Preventing Overheating
of FETs
• Dual-Stage Current Limiting
• 1.0x Startup Current (MAX14721)
• 1.5x Startup Current (MAX14722)
• 2.0x Startup Current (MAX14723)
The MAX14721–MAX14723 also feature reverse-current
and overtemperature protection. The devices are available
in a 20-pin (5mm x 5mm) TQFN package and operate
over a -40°C to 125°C temperature range.
Applications
Industrial Power Systems
Control and Automation
Motion System Drives
Human Machine Interfaces
● Flexible Design Enables Reuse and Less
Requalification
• Adjustable OVLO and UVLO Thresholds
• Programmable Forward Current Limit From 0.2A
to 2A with ±15% Accuracy Over Full Temperature
Range
• Normal and High-Voltage Enable Inputs
(EN and HVEN)
• Protected External pFET Gate Drive
High-Power Applications
● Saves Board Space and Reduces External BOM
Count
• 20-Pin, 5mm x 5mm TQFN Package
• Integrated nFET
Ordering Information appears at end of data sheet.
Typical Application Circuit
VIN
*R1, R2, R3, AND R4 ARE ONLY
REQURED FOR ADJUSTABLE UVLO/
OVLO FUNCTIONALITY. OTHERWISE,
CIN
C
IN_C
TIE THE PIN TO GND TO USE THE
GP
IN
IN IN
INTERNAL, PREPROGRAMMED
VIN
THRESHOLD.
R1*
R3*
OUT
OUT
OUT
SYSTEM
UVLO
OVLO
POWER
CONTROLLER
PROTECTED
POWER
220kΩ
R2*
R4*
SYSTEM
INPUT
ADC
MAX14721–
MAX14723
COUT
VIN
HVEN
SETI
RIPEN
FLAG
EN
GND
ENB
FAULT
EN
HVEN
x
CLTS2
10kΩ
CLTS1
GND
19-7370; Rev 3; 11/17