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%ApplicationSwitching regulators in buck, boost, inverting, and single-ended transformer configurations
Motor speed control
Lamp flasher
Specifications
| 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 |
| AEC Q-100 Automotive Grade |
Undefined |
| Synchronous Rectification |
No |
| View Using Catalog |
Total Supply Voltage 50V
Collector Output to Ground −0.3V to +50V
Emitter Output to Ground (Note 2) −1V to +50V
Power Dissipation (Note 3) Internally limited
Output Current 750 mA
Storage Temperature −65°C to +150°C
Lead Temperature
(soldering, 10 seconds)260°C
Maximum Junction Temperature150°C
ESD Tolerance (Note 4) 2 kV
Ambient Temperature Range
LM1578A −55°C TA +125°C
LM2578A−40°C TA +85°C
LM3578A0°C TA +70°C
Junction Temperature Range
LM1578A−55°C TJ +150°C
LM2578A −40°C TJ +125°C
LM3578A 0°C TJ+125°C
DescriptionThe 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) |
| LM2578 MDC |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LM2578A MDC |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LM2578A MWC |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LM2578AM |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LM2578AMX |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LM2578AN |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
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.
LM2578A Data Sheet
