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78SR-52-C

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78SR 2 Amp Series www.murata-ps.com 2 Amp, 3.3V & 5V Output, High Efficiency, Synchronous Switching Regulators FEATURES  to 95% efficiency– no costly heat sinks or fans Up required  3.3V/2A & 5V/2A models; pin compatible with 1.5A 78xx regulators  8– 32Vdc input voltage range Wide  package options: Two 3-pin vertical mount SIP Low profile, horizontal mount SIP  external Input/Output filter capacitors required No  to +70°C full load operation at 24Vin with no –40 derating  Excellent load (±0.25%) and line (±0.35%) regulation  Low-cost upgrade for 78HT2, 78SR1, 78ST1, and PT5100 switchers  frame design minimizes self-heating & pc-board Open footprint  Includes output short-circuit protection and thermal shutdown  noise output for powering sensitive instrumentation Low Ordering Information Part No. Output Voltage Output Current Input Voltage 78SR-3.3/2-C 78SR-5/2-C 78SRH-3.3/2-C 78SRH-5/2-C 3.3Vdc 5.0Vdc 3.3Vdc 5.0Vdc 2.0A 2.0A 2.0A 2.0A 8.0-32Vdc 8.0-32Vdc 8.0-32Vdc 8.0-32Vdc Murata’s 78SR-3.3/2 (3.3V, 2 Amp output) and 78SR-5/2 (5V, 2 Amp output) step-down, switching regulators are ultra high-efficiency, modern replacements for LM78xx series 1.5Amp linear regulators. They are pin- and size-compatible, drop-in replacements for TO-220 style, 3-pin SIP or modular packages which require heat sinks. And, to ensure the lowest installed cost, no messy thermal grease, no mounting hardware and no external components are required for full operation. A 200KHz switching frequency, combined with a synchronous rectifier buck regulator topology, provides for efficiencies exceeding 95%. 78SR switchers can easily drive 2A loads from 12V or 24Vsupplies—at ambient temperatures up to +70°C—without heat sinks, fans, or thermal derating. A thermally efficient 3-pin vertical mount SIP occupies less than 0.09in.2 (58mm2) of pc-board real estate, while a horizontal mount option has an installed height of less than 0.290in. (7.4mm). 78SR Series 2A switching regulators are lower cost, improved-efficiency upgrades for many 78HT2, 78SR1, 78ST1, and PT5100 series switchers. Their higher efficiency ensures significantly lower heat generation and provides increased run time in battery-powered applications, making these regulators ideal for today’s low power “green” applications. TECHNICAL NOTES 1. Input/Output (I/O) Filtering: As shown in the accompanying noise and ripple graphs, 78SR Series regulators exhibit excellent low noise performance with no additional I/O filter components. 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 input voltage and ambient temperatures. Adding external output capacitors will 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 potentially 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 select an appropriate slow-blow fuse.   For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM_78SR-2A_B04 Page 1 of 6

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