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LM5009A 100V, 150 mA Constant On-Time Buck 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
LM5009AMM/NOPB
MINI SOIC 8 1 260 Detail Download N/A
ZXTT
SLLA
LM5009AMMX/NOPB
MINI SOIC 8 1 260 Detail Download N/A
ZXTT
SLLA
LM5009ASD/NOPB
LLP 8 1 260 Detail Download N/A
NS
UZXYTT
5009ASD
LM5009ASDX/NOPB
LLP 8 1 260 Detail Download N/A
NS
UZXYTT
5009ASD

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Description

The LM5009A is a functional variant of the LM5009 COT Buck Switching Regulator. The functional differences of the LM5009A are: The minimum input operating voltage is 6 volts, the on-time equation is slightly different, and the requirement for a minimum load current is removed.

The LM5009A Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The regulator is based on a control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-voltage lockout, Max Duty Cycle limiter, and a pre-charge switch.

Features

Operating input voltage range: 6V to 95V
Integrated 100V, N-Channel buck switch
Internal start-up regulator
No loop compensation required
Ultra-Fast transient response
On time varies inversely with input voltage
Operating frequency remains constant with varying line voltage and load current
Adjustable output voltage from 2.5V
Highly efficient operation
Precision internal reference
Low bias current
Intelligent current limit
Thermal shutdown

Diagrams

Typical Application
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Block Diagram
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Typical Performance
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