Datasheet
Package Availability, Models, Samples & Pricing
General 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
hysteretic 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 hysteretic control 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.
Design Tools
| Title | Size in Kbytes |
Date |
 |
|
|
| LM5009 Quick Start Calculator |
357 Kbytes |
10-Jul-2009 |
View |
|
|
Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1445: Application Note 1445 LM5009 Evaluation Board |
479
Kbytes |
23-Jul-08 |
Download |
| AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs |
574
Kbytes |
27-Sep-06 |
Download |
AN-1481 (Japanese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs
 |
220 Kbytes |
|
 |
AN-1481 (Chinese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs
|
421 Kbytes |
|
 |
| AN-1820: Application Note 1820 LM5032 Interleaved Boost Converter |
1942
Kbytes |
30-May-08 |
Download |
| AN-1962: Application Note 1962 LM5032 Interleaved Boost Evaluation Board |
2506
Kbytes |
27-Aug-09 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1937: Application Note 1937 LM3433 10A to 40A LED Driver Evaluation Board |
1559
Kbytes |
25-Mar-09 |
Download |
| AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge |
230
Kbytes |
2-Jul-08 |
Download |
| AN-1319: Application Note 1319 Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007 |
426
Kbytes |
25-May-04 |
Download |
AN-1319 (Chinese): Application Note 1319 Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007
|
484 Kbytes |
|
|
| AN-1956: Application Note 1956 LM5001 Boost Evaluation Board |
838
Kbytes |
4-Mar-09 |
Download |
| AN-1588: Application Note 1588 LM5001 Evaluation Board |
658
Kbytes |
18-Mar-07 |
Download |
| AN-1748: Application Note 1748 LM5005 Evaluation Board |
159
Kbytes |
7-Nov-07 |
Download |
| AN-1574: Application Note 1574 LM5073 Evaluation Board |
464
Kbytes |
24-Apr-07 |
Download |
| AN-1634: Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT |
71
Kbytes |
17-May-07 |
Download |
AN-1634 (Japanese): Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT
|
95 Kbytes |
|
|
AN-1634 (Chinese): Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT
|
222 Kbytes |
|
|
| AN-1330: Application Note 1330 LM5008 Evaluation Board |
334
Kbytes |
7-May-04 |
Download |
| AN-1298: Application Note 1298 LM5007 Evaluation Board |
313
Kbytes |
29-Jan-04 |
Download |
| AN-1630: Application Note 1630 LM5001 Non-Isolated Flyback Evaluation Board |
250
Kbytes |
17-Jun-09 |
Download |
| AN-1736: Application Note 1736 LM3433 HB LED Driver Evaluation Kit |
1011
Kbytes |
4-Feb-08 |
Download |
| AN-1793: Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board |
701
Kbytes |
25-Aug-08 |
Download |
AN-1793 (Chinese): Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board
|
591 Kbytes |
|
|
[Information as of 7-Nov-2009]
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