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LM2578A -
Switching Regulator
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Features
| • | Inverting and non-inverting feedback inputs |
| • | 1.0V reference at inputs |
| • | Operates from supply voltages of 2V to 40V |
| • | Output current up to 750 mA, saturation less than 0.9V |
| • | Current limit and thermal shut down |
| • | Duty cycle up to 90% |
General Description
The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. More...
Applications
| • | Switching regulators in buck, boost, inverting, and single-ended transformer configurations |
| • | Motor speed control |
| • | Lamp flasher |
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Typical Application
*click for larger image
Temp range: LM2578A: -40 to +125C; LM3578A: 0 to 125C
| Parameters | Values |
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| Output Current |
750 mA |
| Input Min Voltage |
2 Volt |
| Input Max Voltage |
40 Volt |
| Frequency Min |
1 kHz |
| Frequency Max |
100 kHz |
| Efficiency (peak) |
Undefined % |
| On/Off Pin |
No |
| Error Flag |
No |
| SoftStart |
No |
| Sync Pin |
No |
| Inverting |
Yes |
| Flyback |
Yes |
| RegType |
Switching Controller |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Adjustable Output |
Yes |
| Adj Switch Frequency |
Yes |
| PWM Mode |
Voltage |
| Topology |
Buck, Boost, Flyback, Inverting |
| Special Features |
FB and NFB pins |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Range |
Undefined |
| Switching Frequency |
20 kHz |
| Feedback Voltage |
1 Volt |
| Synchronous Rectification |
No |
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Also Recommended
| LM3578A▲ | LM2578A With 0 To 125C Temperature Range |
Additional Resources
Online Seminars
Connection Diagram
*click for larger image
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Datasheet
Package Availability, Models, Samples & Pricing
General Description
The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM2578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs, but also provides an internal 1.0V reference to each input, thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM2578A has an on board oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical).
The LM2578A is an improved version of the LM2578, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM2578AM | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2578AMX | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2578AN | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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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.
[Information as of 8-Nov-2009]
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RoHS Compliance Information
