Document Number: MC34652
Rev. 8.0, 2/2007
Freescale Semiconductor
Advance Information
2.0 A Negative Voltage Hot
Swap Controller with Enhanced
Programmability
34652
The 34652 is a highly integrated -48 V hot swap controller with an
internal Power MOSFET. It provides the means to safely install and
remove boards from live -48 V backplanes without having to power
down the entire system. It regulates the inrush current, from the
supply to the load’s filter capacitor, to a user-programmable limit,
allowing the system to safely stabilize. A disable function allows the
user to disable the 34652 manually or through a microprocessor and
safely disconnect the load from the main power line.
HOT SWAP
The 34652 has active high and active low power good output
signals that can be used to directly enable a power module load.
Programmable under- and overvoltage detection circuitry monitors
the input voltage to check that it is within its operating range.
A programmable start-up delay timer ensures that it is safe to turn on
the Power MOSFET and charge the load capacitor.
A two-level current limit approach to controlling the inrush current
and switching on the load limits the peak power dissipation in the
Power MOSFET. Both current limits are user programmable.
SCALE 2:1
EF SUFFIX (PB-Free)
98ASB42566B
16-PIN SOICN
Features
ORDERING INFORMATION
• Integrated Power MOSFET and Control IC in a Small Outline
Package
• Input Voltage Operation Range from -15 V to -80 V
• Programmable Overcurrent Limit with Auto Retry
• Programmable Charging Current Limit Independent of Load
Capacitor
• Programmable Start-Up and Retry Delay Timer
• Programmable Overvoltage and Undervoltage Detection
• Active High and Low Power Good Output Signals
• Thermal Shutdown
Temperature
Package
Device
Range (T )
A
MC34652EF/R2
MCZ34652EF/R2
-40°C to 85°C
16 SOICN
• Pb-Free Packaging Designated by Suffix Code EF
34652
DISABLE
Application
Dependent
PG
GND
System
Power
Supply
VPWR
UV
PG
VOUT
Load
OV
(Backplane)
-48 V
VIN
ICHG
Optional
External
Components
TIMER
Optional
External
Components
ILIM
Figure 1. 34652 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.