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PDF 34652 Data sheet ( Hoja de datos )
| Número de pieza | 34652 | |
| Descripción | Negative Voltage Hot Swap Controller | |
| Fabricantes | Freescale Semiconductor | |
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Advance Information
Document Number: MC34652
Rev. 8.0, 2/2007
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.
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.
Features
• 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
• Pb-Free Packaging Designated by Suffix Code EF
HOT SWAP
SCALE 2:1
EF SUFFIX (PB-Free)
98ASB42566B
16-PIN SOICN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34652EF/ R2
MCZ34652EF/ R2
-40°C to 85°C
16 SOICN
34652
GND
System
Power
Supply
(Backplane)
DISABLE
VPWR
UV
OV
PG
PG
VOUT
Application
Dependent
Load
-48 V VIN
Optional
External
Components
ICHG
ILIM
TIMER
Optional
External
Components
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.
1 page  
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings (continued)
All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or
permanent damage to the device.
Ratings
Symbol
Value
Unit
ELECTRICAL RATINGS
Peak Package Reflow Temperature During Reflow (5), (6)
Thermal Resistance (7), (8)
Junction-to-Ambient, Single-Layer Board (9)
Junction-to-Ambient, Four-Layer Board (10)
TPPRT
RθJA
RθJMA
Note 6
103
65
°C
°C/W
Notes
5. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
6. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
Temperature and Moisture Sensitivity Levels (MSL),
Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e.
MC33xxxD enter 33xxx), and review parametrics.
7. Refer to the section titled Thermal Shutdown on page 16 for more thermal resistance values under various conditions.
8. The VOUT and VIN pins comprise the main heat conduction paths.
9. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board (JESD51-3) horizontal.
10. Per JEDEC JESD51-6 with the board (JESD51-7) horizontal. There are no thermal vias connecting the package to the two planes in the
board.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34652
5
5 Page 
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
POWER GOOD OUTPUT (ACTIVE LOW) (PG)
The PG pin is the active low power good output signal that
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.
The signal is deactivated under the following conditions:
• Power is turned off.
• The device is disabled for more than 1.0 ms.
• The device exceeded its thermal shutdown threshold for
more than 12 µs.
• The device is in overvoltage or undervoltage mode for
more than 1.0 ms.
• Load current exceeded the overcurrent limit for more than
3.0 ms.
This pin is referenced to VIN.
OUTPUT VOLTAGE (VOUT)
The VOUT pin is the drain of the internal Power MOSFET
and supplies a current-limited voltage to the load. The load
connects between the VOUT and VPWR pins.
START-UP AND RETRY DELAY TIMER (TIMER)
This input is used to control the time-base used to
generate the timing sequences at start-up and the retry delay
when the device experiences any fault. The TIMER pin can
be left unconnected for a default timer value of 200 ms or the
user can connect a resistor between this pin and the VIN pin
to set the timer value externally. The timer value can vary
between 100 ms and 1000 ms.
OVERVOLTAGE CONTROL (OV)
The OV pin is used to set the upper limit of the input
voltage operation range. If the OV pin voltage goes above the
overvoltage threshold value, the device turns off the internal
Power MOSFET and deactivates the two power good
outputs, PG and PG. The Power MOSFET stays off until the
OV drops below the threshold value. The overvoltage
detection circuit has a 1.0 ms filter timer.
The OV pin can be left unconnected for the typical default
threshold value of 78 V or the user can set the threshold
value externally with a simple voltage divider using resistors
between the VPWR and VIN pins.
UNDERVOLTAGE CONTROL (UV)
The UV pin is used to set the lower limit of the input voltage
operation range. If the UV pin voltage goes below the
undervoltage threshold value, the device turns off the internal
Power MOSFET and deactivates the two power good
outputs, PG and PG. The Power MOSFET stays off until the
UV rises above the threshold value. The undervoltage
detection circuit has a 1.0 ms filter timer.
The UV pin can be left unconnected for the typical default
threshold value of 37 V or the user can set the threshold
value externally with a simple voltage divider using resistors
between the VPWR and VIN pins.
POSITIVE SUPPLY VOLTAGE INPUT (VPWR)
The VPWR pin is the most-positive power supply input.
The load connects between the VPWR and VOUT pins.
DISABLE INPUT CONTROL (DISABLE)
The DISABLE pin is used to easily disconnect or connect
the load from the main power line by disabling or enabling the
34652. It can also be used to reset the fault conditions that
cause a “Power No Good” signal.
If left open or connected to VPWR, the DISABLE pin is
inactive and the device is enabled. If a positive voltage
(above VPWR) or a negative voltage (below VPWR) is applied
to DISABLE, it is active and the device is disabled. The
disable function has a 1.0 ms filter timer.
This pin is referenced to VPWR.
CURRENT LIMIT CONTROL (ILIM)
The ILIM pin is used to set the overcurrent limit during
normal operation. This pin can be left unconnected for a
default overcurrent limit value of 1.0 A or the user can
connect an external resistor between the ILIM and VIN pins
to set the overcurrent limit value. This value can vary
between 0.35 A and 2.25 A. The overcurrent detection circuit
has a 100 µs filter timer.
CHARGING CURRENT LIMIT CONTROL (ICHG)
The ICHG pin is used to set the current limit that is used to
charge the load’s input capacitor, hence limiting the inrush
current to a known constant value. This pin can be left
unconnected for a default charging current limit value of 0.1 A
and a default ICHG rise time of 1.0 ms. Or the user can
connect an external resistor between the ICHG and VIN pins
to set the current limit value between 0.05 A and 0.5 A and an
Analog Integrated Circuit Device Data
Freescale Semiconductor
34652
11
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet 34652.PDF ] | |
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