LM5009_14 Datasheet, PDF (1/22 Pages) Texas Instruments – 150-mA 100-V Step-Down Switching Regulator

LM5009
www.ti.com
SNVS402F – FEBRUARY 2006 – REVISED NOVEMBER 2011
150-mA 100-V Step-Down Switching Regulator
Check for Samples: LM5009
FEATURES
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•2 Integrated N-Channel MOSFET
• 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-8
packages
APPLICATIONS
• Heat sink eliminator for classic linear regulator
applications
• 12V, 24V, 36V, and 48V rectified AC systems
• 42V Automotive
• Non-isolated AC mains charge coupled
supplies
• LED Current Source
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.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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