LM2578A - Switching Regulator
Datasheet Packaging Samples & Pricing Reliability Knowledge Base

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
  Typical Application
*click for larger image

Temp range: LM2578A: -40 to +125C; LM3578A: 0 to 125C

ParametersValues
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

  Also Recommended
LM3578ALM2578A With 0 To 125C Temperature Range
Additional Resources
Online Seminars
Connection Diagram
*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2578A/LM3578A Switching Regulator 1378
Kbytes
7-Apr-05 Download
LM2578A/LM3578A Switching Regulator (Japanese)
1079 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM2578AMSOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$1.42rail
of
95
NSZXTT
2578
AM
6 weeks500
LM2578AMXSOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$1.42reel
of
2500
NSZXTT
2578
AM
8 weeks5000
LM2578ANMDIP8NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$1.42rail
of
40
NSUZXYTTE#
LM2578AN
6 weeks500

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)
LM2578AMSLM04404600353250011002356520
LM2578AMXSLM04404600353250011002356520
LM2578ANSLM04404600353250011002356520

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]