MC34652EF Freescale Semiconductor, MC34652EF Datasheet - Page 10

• Manufacturer Part Number: MC34652EF
• Description: IC CTRLR HOT SWAP NEG V 16-SOIC
• Manufacturer: Freescale Semiconductor
• Type: Hot-Swap Switchr

Specifications of MC34652EF

• Applications: General Purpose
• Internal Switch(s): Yes
• Current Limit: 2.0A
• Voltage - Supply: 15 V ~ 80 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

circuit boards be inserted and removed from the system
without powering down the entire system. When a circuit
board is inserted into or removed from a live backplane, the
filter or bypass capacitors at the input of the board’s power
module or switching power supply can cause large transient
currents when being charged or discharged. These currents
can cause severe and permanent damage to the boards, thus
making the system unstable.
current to the filter capacitor if a hot swap device is absent.
The inrush current reached an unsafe value of more than
55 A.
controller with an internal Power MOSFET. The 34652
resides on the plug-in boards and allows the boards to be
safely inserted or removed by powering up the supply
NEGATIVE SUPPLY INPUT VOLTAGE (VIN)
pins except the DISABLE pin are referenced to this input.
POWER GOOD OUTPUT (ACTIVE HIGH) (PG)
is used to enable or disable a load. This signal goes active
after a successful power-up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults.
10
34652
FUNCTIONAL DESCRIPTION
INTRODUCTION
Most telecom and data transfer networks require that
The 34652 is an integrated negative voltage hot swap
The VIN pin is the most negative power supply input. All
The PG pin is the active high power good output signal that
Hot Swap Device, Inrush Current Not Limited
Figure 4. Circuit Board Insertion Without a
Figure 4
displays the inrush
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
INTRODUCTION
systems,
distributed power systems, negative power supply control,
and central office switching.
voltages in a controlled manner and regulating the inrush
current to a user-programmable limit, thus allowing the
system to safely stabilize (see
protection against overcurrent, undervoltage, overvoltage,
and overtemperature. Furthermore, it protects the system
from short circuits.
switch into a space-efficient package, the 34652 offers a
complete, cost-effective, and simple solution that takes much
less board space than a similar part with an external Power
MOSFET requires.
• Power is turned off.
• The device is disabled for more than 1.0 ms.
• The device exceeded its thermal shutdown threshold for
• The device is in overvoltage or undervoltage mode for
• Load current exceeded the overcurrent limit for more than
By integrating the control circuitry and the Power MOSFET
The 34652 can be used in - 48 V telecom and networking
The signal is deactivated under the following conditions:
more than 12 μs.
more than 1.0 ms.
3.0 ms.
This pin is referenced to VIN.
Figure 5. Circuit Board Insertion With the Hot Swap
servers,
Device, Inrush Current Limited
electronic circuit breakers, - 48 V
Analog Integrated Circuit Device Data
Figure
Freescale Semiconductor
5). The 34652 provides