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LM2599 -
SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator with Features
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Features
| | 3.3V, 5V, 12V, and adjustable output versions |
| | Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions |
| | Guaranteed 3A output current |
| | Available in 7-pin TO-220 and TO-263 (surface mount) Package |
| | Input voltage range up to 40V |
| | 150 kHz fixed frequency internal oscillator |
| | Shutdown#/Soft-start |
| | Out of regulation error flag |
| | Error output delay |
| | Low power standby mode, IQ
typically 80 µA |
| | High Efficiency |
| | Uses readily available standard inductors |
| | Thermal shutdown and current limit protection |
General Description
The LM2599 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. More...
Applications
| | Simple high-efficiency step-down (buck) regulator |
| | Efficient pre-regulator for linear regulators |
| | On-card switching regulators |
| | Positive to Negative converter |
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Typical Application
click for larger image
| Parameters | Values |
| Output Current |
3000 mA |
| Input Min Voltage |
4.5, 7, 4.75, 15 Volt |
| Input Max Voltage |
40 Volt |
| Output Min |
3.3, 1.23, 12, 5 Volt |
| Output Max |
3.3, 37, 12, 5 Volt |
| Frequency Min |
150 kHz |
| Frequency Max |
150 kHz |
| Efficiency (peak) |
90 % |
| On/Off Pin |
Yes |
| Error Flag |
Yes |
| SoftStart |
Yes |
| Sync Pin |
No |
| Inverting |
Yes |
| Flyback |
No |
| RegType |
Switching Regulator |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Adjustable Output |
Yes, No |
| Adj Switch Frequency |
No |
| PWM Mode |
Voltage |
| Topology |
Buck |
| Special Features |
SIMPLE SWITCHER regulator, error output delay |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Power |
Undefined Watt |
| Output Voltage |
3.3, Undefined, 12, 5 Volt |
| Output Range |
5V, 12V, 1.23V to 37V, 3.3V |
| Switching Frequency |
150 kHz |
| Regulator Family |
SIMPLE SWITCHER |
| Synchronous Rectification |
No |
Typical Performance
*click for larger image
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WEBENCH Live Simulation!
Additional Resources
Design Tools
Application Notes

Block Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM2599 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features |
815 Kbytes |
23-Jan-01 |
Download |
LM2599 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features (Japanese)
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508 Kbytes |
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Package Availability, Models, Samples & Pricing
General Description
The LM2599 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.
This series of switching regulators is similar to the LM2596 series, with additional supervisory and performance features added.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown#/Soft-start, error flag delay and error flag output.
The LM2599 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 7-lead TO-220 package with several different lead bend options, and a 7-lead TO-263 Surface mount package.
A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2599 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM2599S-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599S-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599S-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599S-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599SX-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599SX-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599SX-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599SX-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599T-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599T-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599T-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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LM2599T-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
| Title | Size in Kbytes |
Date |
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| SimpleSwitcher® DC-DC Converters Design Software |
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View |
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Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment |
162 Kbytes |
1-Oct-02 |
Download |
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
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215 Kbytes |
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More Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines |
229 Kbytes |
1-May-04 |
Download |
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
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304 Kbytes |
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AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
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668 Kbytes |
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| AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency |
50 Kbytes |
4-Oct-04 |
Download |
AN-1082 (Japanese): Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency
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85 Kbytes |
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| AN-1118: AN-1118 Simple Regulator Provides ±12V from 5V Source |
51 Kbytes |
4-Oct-04 |
Download |
| AN-1081: Application Note 1081 A Low Cost, Low Parts-Count DC/DC Converter With Multiple Outputs |
74 Kbytes |
4-Oct-04 |
Download |
| AN-1253: Application Note 1253 Wide-Input, High Voltage Buck Converter |
144 Kbytes |
25-Sep-02 |
Download |
| AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs |
370 Kbytes |
7-Feb-07 |
Download |
AN-1566 (Japanese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
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442 Kbytes |
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AN-1566 (Chinese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
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282 Kbytes |
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| AN-1207: Application Note 1207 LM2593HV Evaluation Board |
219 Kbytes |
10-May-04 |
Download |
| AN-1797: Application Note 1797 TO-263 THIN Package |
2716 Kbytes |
10-Mar-08 |
Download |
AN-1797 (Japanese): Application Note 1797 TO-263 THIN Package
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1424 Kbytes |
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[Information as of 8-Nov-2009]
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