DESCRIPTION
The MP5921 is a monolithic, integrated
controller and switch that contains a high-side
MOSFET and other circuitries that enable it to
work in standalone operation or to be controlled
by a hot-swap controller. The MP5921 drives up
to 50A of continuous current per device at room
temperature. With air flow, the continuous
current can reach 60A.
The MP5921 limits the inrush current to the
load when a circuit card is inserted into a live
backplane power source, thereby limiting the
backplane’s voltage drop. The MP5921 limits
the internal MOSFET current by controlling the
gate voltage through the current limit reference
input and soft-start ramp.
The MP5921 offers many features to simplify
system design. It provides an integrated current
mirror to monitor the output current and on-die
temperature sensing, eliminating the need for
an external current-sense power resistor, power
MOSFET, and thermal sense device.
The MP5921 detects the power FET gate,
source, and drain short conditions and can
feedback to the hot-swap controller via the fault
reporting output (GOK). The MP5921 can be
paralleled for higher current applications. All
devices in parallel share current actively during
soft start.
The MP5921 is available in a QFN-28
(4mmx5mm) package.

FEATURES
• 4V to 16V Operating Input Range
• Maximum 50A Output Current
• Supports 60A of Output Current with Air
Flow
• Integrated Switch with 1mΩ RDS(ON)
• Built-In MOSFET Driver
• 3.0V LDO Output
• Integrated Current Sensing with Sense
Output
• Separate Current Sensing Output Used to
Program Over-Current Value
• Built-In Insertion Delay
• Adjustable Soft Start (SS)
• Output Short-Circuit Protection (SCP)
• Over-Temperature Protection (OTP)
• Built-In Fuse Health Reporting
• Fault Signal Output
• Parallel Operation for High-Current
Applications
• Integrated Intelli-Fuse Temperature Sense
• Output Voltage Power-Down Control
• Available in a FCQFN-28 (4mmx5mm)
Package

APPLICATIONS
• Hot Swap
• PC Cards
• Disk Drives
• Servers
• Networking