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