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DMS-78XXSR Datasheet(PDF) 1 Page - Murata Manufacturing Co., Ltd. |
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DMS-78XXSR Datasheet(HTML) 1 Page - Murata Manufacturing Co., Ltd. |
1 / 6 page MDC_78xxSR Series.B03 Page 1 of 6 78xxSR Series 3.3V/5V/12V Outputs High-Efficiency Switching Regulators with LM78xx Pinouts For full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 Murata Power Solutions’ 7805SR-C (5V output), 7812SR-C (12V output) and 7803SR-C (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 size-compat- ible 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. Applications in which 78SR regulators are located more than 24 inches (61cm) from the input power supply should include an external 47uF/50V (or greater) aluminum electrolytic capacitor, connected as close as possible to the regulator’s +Vin and GND terminals (pins 1 and 2). An external input capacitor is particularly important if the input voltage is applied to the regulator via a mechanical switch or relay. Contact bounce at turn-on can produce large inductive current-spikes, and these current spikes can generate damaging voltage transients at the regulator’s input terminals. 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-C and 7803SR-C, and to 0.3A for 7812SR-C. Under no circumstances should the input voltage be allowed to exceed 45Vdc. MPS Part No. Output Output Input Voltage Current Voltage Standard Pin Package 7803SR-C +3.3Vdc 0.5A +7.5-36Vdc 7805SR-C +5.0Vdc 0.5A +7.5-36Vdc 7812SR-C +12.0Vdc 0.4A +15-36Vdc Horizontal Pin Package 7803SRH-C +3.3Vdc 0.5A +7.5-36Vdc 7805SRH-C +5.0Vdc 0.5A +7.5-36Vdc 7812SRH-C +12.0Vdc 0.4A +15-36Vdc Ordering Information 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 protection |
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