MAX14691 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – High-Accuracy, Adjustable Power Limiter

MAX14691–MAX14693
High-Accuracy, Adjustable Power Limiter
General Description
The MAX14691–MAX14693 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. The devices feature a low, 31mΩ, 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
devices 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.
The MAX14691–MAX14693 also feature reverse-current
and overtemperature protection. The devices are avail-
able in a 20-pin (5mm x 5mm) TQFN package and oper-
ate over the -40ºC to 125ºC temperature range.
Applications
●● Industrial Power Systems
●● Control and Automation
●● Motion System Drives
●● Human Machine Interfaces
●● High-Power Applications
Typical Application Circuit
Features and Benefits
●● Robust, High-Power Protection Reduces System
Downtime
• Wide Input Range: +5.5V to +58V
• Negative Input Tolerance to -60V with External
pFET
• Low 31mΩ (typ) R_ON
• Reverse Current-Blocking Protection with External
pFET
●● Enables Fast Startup and Brownout Recovery
• Thermal Foldback Current-Limit Protection
• Dual-Stage Current Limiting
– 1.0x Startup Current (MAX14691)
– 1.5x Startup Current (MAX14692)
– 2.0x Startup Current (MAX14693)
●● Flexible Design Enables Reuse and Less
Requalification
• Adjustable OVLO and UVLO Thresholds
• Programmable Forward Current Limit From 0.6A to
6A with ±15% Accuracy Over Full Temperature
Range
• Normal and High-Voltage Enable Inputs
(EN and HVEN)
• Protected External pFET Gate Drive
●● 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.
*R1, R2, R3, AND R4 ARE ONLY
REQURED FOR ADJUSTABLE
UVLO/OVLO FUNCTIONALITY.
OTHERWISE, TIE THE PIN TO
GND TO USE THE INTERNAL,
PRE-PROGRAMMED
THRESHOLD.
POWER
SYSTEM
INPUT
220kΩ
HVEN
GND
VIN
CIN
VIN
R1*
R2*
VIN
R3*
R4*
x
10kΩ
GP
UVLO
OVLO
HVEN
CLTS2
CLTS1
IN
IN IN IN IN
OUT
OUT
MAX14691–
OUT
MAX14693
OUT
OUT
SETI
RIPEN
FLAG
EN
GND
PROTECTED
POWER
COUT
SYSTEM
CONTROLLER
ADC
ENB
FAULT
EN
19-7403; Rev 1; 8/14