LM2576-5.0BU Micrel Inc, LM2576-5.0BU Datasheet
LM2576-5.0BU
Specifications of LM2576-5.0BU
Related parts for LM2576-5.0BU
LM2576-5.0BU Summary of contents
Page 1
... A standard series of inductors available from several different manufacturers are ideal for use with the LM2576 series. This feature greatly simplifies the design of switch-mode power supplies. The feedback voltage is guaranteed to 2% tolerance for ...
Page 2
... LM2576 Ordering Information Standard LM2576BT* LM2576-3.3BT LM2576-5.0BT LM2576-12BT LM2576BU* LM2576-3.3BU LM2576-5.0BU LM2576-12BU * Adjustable output regulators. **RoHS compliant with "hot-melting solder" exemption. † Contact factory for bent or staggered leads option. Pin Configurations 5-LEAD TO-220 (T) GND M9999-082605-B Part Number ‡ RoHS Compliant** Range † ...
Page 3
... Output Voltage 0.5A OUT LM2576-5.0 V Efficiency V SYSTEM PARAMETERS, 12V REGULATORS (Note 3) Test Circuit Figure 1 V Output Voltage V OUT V V Output Voltage 0.5A OUT LMLM2576-12 V Efficiency V August 2005 Operating Ratings (Note 1) 45V Temperature Range –0.3V V +40V Supply Voltage –1V Internally Limited – +150 ...
Page 4
... T,U Package, Junction to Ambient (Note 7) JA T,U Package, Junction to Ambient (Note 8) JA T,U Package, Junction to Case JC M9999-082605 OUT = 3A (Note 4) OUT 3 s (Note 40V, (Note 6), Output = 0V IN Output = –1V Output = –1V 4 LM2576 Typ Limit (Note 2) 50 100/500 52 47/42 58/63 1.4 1.8/2 5.8 4.2/3.5 6.9/7.5 2 7.5 30 ...
Page 5
... All limits at temperature extreme are guaranteed via testing. Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM1576 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of Electrical Characteristics. Note 4: Output (pin 2) sourcing current ...
Page 6
... LM2576 Typical Performance Characteristics (continued) Supply Current 20 Measured at Ground Pin 25˚ OUT = LOAD INPUT VOLTAGE (V) Current Limit 25V -75 -50 - 100 125 150 JUNCTION TEMPERATURE (˚C) Minimum Operating Voltage 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 V OUT = 1.23V 1.0 I LOAD = 200 mA ...
Page 7
... LM2576 Typical Performance Characteristics Output Voltage Change Output Current August 2005 (Circuit of Figure 1 ) Load Transient Response +100mV 0 -100mV 100 µS/div. Switching Waveforms 50V µS/div OUT = 45V A: Output pin voltage 50V/div B: Output pin current 2A/div C: Inductor current 2A/div D: Output ripple voltage 50 mV/div., AC coupled Horizontal Time Base: 5µ ...
Page 8
... LM2576 Test Circuits and Layout Guidelines +V IN LM2575 40V 100 µF + UNREGULATED GND 3 DC INPUT LM2575-5 40V 100 µF + UNREGULATED GND 3 DC INPUT C IN Note: Pin numbers are for TO-220 Package As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems ...
Page 9
... LM2576 Package Information 0.108 0.005 (2.74 0.13) 0.067 0.005 (1.70 0.127) 0.268 REF (6.81 REF) 0.065 0.010 20 2 0.067 0.005 DIM. = INCH MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. ...