LM5010 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – High Voltage 1A Step Down Switching Regulator

October 2004
LM5010
High Voltage 1A Step Down Switching Regulator
General Description
The LM5010 Step Down Switching Regulator features all the
functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying in excess of 1A load
current. This high voltage regulator contains an N-Channel
Buck Switch, and is available in thermally enhanced LLP-10
and TSSOP-14EP packages. The hysteretic regulation
scheme requires no loop compensation, results in fast load
transient response, and simplifies circuit implementation.
The operating frequency remains constant with line and load
variations due to the inverse relationship between the input
voltage and the on-time. The valley current limit detection is
set at 1.25A. Additional features include: V_CC under-voltage
lockout, thermal shutdown, gate drive under-voltage lockout,
and maximum duty cycle limiter.
Features
n Input Voltage Range: 8V to 75V
n Valley Current Limit At 1.25A
n Switching Frequency Can Exceed 1 MHz
n Integrated N-Channel Buck Switch
n Integrated Startup Regulator
n No Loop Compensation Required
n Ultra-Fast Transient Response
n Operating Frequency Remains Constant With Load and
Line Variations
n Maximum Duty Cycle Limited During Startup
n Adjustable Output Voltage
n Precision 2.5V Feedback Reference
n Thermal shutdown
Typical Applications
n High Efficiency Point-Of-Load (POL) Regulator
n Non-Isolated Telecommunications Buck Regulator
n Secondary High Voltage Post Regulator
n Automotive Systems
Package
n LLP-10 (4 mm x 4 mm)
n TSSOP-14EP
n Both Packages Have Exposed Thermal Pad For
Improved Heat Dissipation
Basic Stepdown Regulator
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© 2004 National Semiconductor Corporation DS201199
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