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LM5009 150 mA, 100V Step-Down Switching Regulator from the PowerWise® Family


source: | post time:2010-05-02

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM5009MM/NOPB
LM5009MM
MINI SOIC 8 1
1
260
260
Detail Download N/A
ZXTT
SLLB
LM5009MMX/NOPB
LM5009MMX
MINI SOIC 8 1
1
260
260
Detail Download N/A
ZXTT
SLLB
LM5009SDC/NOPB
LM5009SDC
LLP 8 1
1
260
260
Detail Download N/A
NS
UZXYTT
5009SD
LM5009SDCX/NOPB
LM5009SDCX
LLP 8 1
1
260
260
Detail Download N/A
NS
UZXYTT
5009SD

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Description

The LM5009 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This device is capable of driving a 150 mA load current from a 9.5V to 95V input source. The switching frequency can exceed 600 kHz, depending on the input and output voltages. The output voltage may be set from 2.5V to 85V. This high voltage regulator contains an N-Channel buck switch and internal startup regulator. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The LM5009 is a well suited alternative to a high voltage monolithic or discrete linear solution where the power loss becomes unacceptable. The regulator’s operation is based on a control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant over load and input voltage variations. The control scheme requires no loop compensation, resulting in an ultra-fast transient response. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit protection while providing minimum foldback. Other features include: Thermal Shutdown, Vcc under-voltage lockout, Gate drive under-voltage lockout, and Maximum Duty Cycle limiter.

Features

Integrated N-Channel MOSFET
Guaranteed 150 mA output current capability
Ultra-Fast Transient Response
No loop compensation required
Vin feed forward provides constant operating frequency
Switching frequency can exceed 600 kHz
Highly efficient operation
2% accurate 2.5V feedback from -40°C to 125°C
Internal startup regulator
Intelligent current limit protection
External shutdown control
Thermal shutdown
MSOP-8 and thermally enhanced LLP packages

Diagrams

Typical Application
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Block Diagram
*click for larger image


 


Typical Performance
*click for larger image


 


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