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LM7803SR Dataheets PDF



Part Number LM7803SR
Manufacturers Datel
Logo Datel
Description High-Efficiency Switching Regulators
Datasheet LM7803SR DatasheetLM7803SR Datasheet (PDF)

www.DataSheet.co.kr ® ® A SUBSIDIARY OF C&D TECHNOLOGIES 78SR Series NEW low-profile package Order online at www.datel.com Features • 3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and size-compatible with LM7805 & LM7812 regulators • Up to 95% efficiency – no heat sinks or thermal derating required! • Two SIP-packages fit existing TO-220 footprints: Vertical-pin models occupy less than 0.1 square in. Optional horizontal pins provide 0.350 in. installed height • +7.5-36Vdc operating input range; .

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www.DataSheet.co.kr ® ® A SUBSIDIARY OF C&D TECHNOLOGIES 78SR Series NEW low-profile package Order online at www.datel.com Features • 3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and size-compatible with LM7805 & LM7812 regulators • Up to 95% efficiency – no heat sinks or thermal derating required! • Two SIP-packages fit existing TO-220 footprints: Vertical-pin models occupy less than 0.1 square in. Optional horizontal pins provide 0.350 in. installed height • +7.5-36Vdc operating input range; Low 3mA quiescent current • Built-in filter capacitors – no external components required • –40 to +70°C operation at full load; Short-circuit protection • Excellent load (±0.2%) and line (±0.3%) regulation • Ideal for powering instrumentation from 9V/12V/24V/28V supplies or batteries • Can be used with unregulated dc supplies 3.3V/5V/12V Outputs High-Efficiency Switching Regulators with LM78XX Pinouts DATEL’s 7805SR (5V output), 7812SR (12V output) and 7803SR (3.3V output) step-down switching regulators are modern drop-in replacements for older, inefficient, LM7805 and LM7812 linear regulators. The 78XXSR's are pin- and sizecompatible with industry-standard TO-220 SIP packages. A 260kHz switching frequency provides for efficiencies as high as 95%. Full-load (up to 0.5A) operation from 9V, 12V, 24V, or 36V supplies at ambient temperatures up to +70°C requires no heat sinks, no temperature derating, no forced-air cooling, and no external capacitors. 78SR switching regulators provide many significant improvements over their linear counterparts: lower quiescent current (3mA vs. 5 mA), higher input voltage (40V vs. 32V), and better output accuracy (±1.5% vs. ±5%). All these features combine to make 78SR regulators ideal for new or existing LM7805 & LM7812 applications requiring full-load operation at elevated voltages. Technical Notes 1. Input/Output (I/O) Filtering: As shown in the noise and ripple graphs, 78SR switching regulators exhibit excellent low-noise performance with no external I/O capacitors. However, if additional noise reduction is required, be sure to use low-ESR capacitors that are rated for continuous operation (with an additional 20% safety margin) at the highest system voltages and temperatures. Adding external output capacitors will also improve the unit’s load-transient response. 2. Input Fusing: 78SR switching regulators are not internally fused. If fusing their input and/or output terminals is required, use the data shown in the Efficiency Curves as a guide to selecting an appropriate slow-blow fuse. 3. Input-Output Isolation: 78SR regulators’ internal input and output circuits share a common connection (GND, pin 2); there is no electrical isolation between the INPUT (pin 1) and OUTPUT (pin 3) terminals. 4. Overvoltage Protection: 78SR switching regulators do not provide input or output overvoltage protection. In the extremely rare situation in which a catastrophic failure occurs, the output voltage may rise to excessively high levels. If your load must be protected against all possible overvoltage situations, external voltage-limiting circuitry must be provided. 5. Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible if, for inputs between 36 and 40Vdc, the maximum load current is reduced to 0.35A for 7805SR and 7803SR, and to 0.3A for 7812SR. Under no circumstances should the input voltage be allowed to exceed 45Vdc. 6. Soldering & Handling Precautions: All units are designed to be hand soldered to pc-boards using no-clean solders (+260°C, 5 seconds max.). Water-soluble solders can also be used, but the units must be washed and dried using processes appropriate to the type of solder employed. See the Mechanical Specifications section for pin 1 orientation and recommended plated-through hole dimensions. While 78SR regulators easily withstand a 2kV ESD discharge to any terminal (using human body model), they should always be treated as ESD sensitive devices. 7. Horizontal-Pin Models (78XXSRH): 78XXSRH switching regulators are pin-compatible replacements for TO-220 style LM78XX linear regulators that are installed with their metal tabs lying flat on the surface of the pc-board. However, because the surface of inductor L1 on 78XXSRH models is electrically conductive, it must not be allowed to come in contact with any exposed pc-board traces, other than power ground (GND). While the 2-mil-thick (0.05mm) polyester label attached to L1 provides some degree of electrical insulation (only if L1 sits perfectly flat on the pc-board), it is recommended that a 0.020” (0.5mm) clearance be maintained between L1 and all exposed pc-board traces. DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: [email protected] • Internet: www.datel.com Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr 78SR Series H I G H - E F F I C I E N C Y S W I T C H I N G R E G U L ATO R S Performance/Functional Specifications Typical at TA = +25°C Input/Output Mo.


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