78SR-5/2-C

78SR-3.3 MURATA1 | Alldatasheet

Document overview

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Technical content

www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs Ḥ 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 1 of 6 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-effi ciency, 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 rectifi er buck regulator topology, provides for effi ciencies 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 effi cient 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-effi ciency upgrades for many 78HT2, 78SR1, 78ST1, and PT5100 series switchers. Their higher effi ciency ensures signifi cantly lower heat generation and provides increased run time in battery-powered applications, making these regulators ideal for today’s low power “green” applications.

FEATURES

Up to 95% effi ciency– no costly heat sinks or fans required 3.3V/2A & 5V/2A models; pin compatible with 1.5A 78xx regulators Wide 8– 32Vdc input voltage range Two package options: 3-pin vertical mount SIP Low profi le, horizontal mount SIP No external Input/Output fi lter capacitors required –40 to +70°C full load operation at 24Vin with no derating Excellent load (±0.25%) and line (±0.35%) regulation Low-cost upgrade for 78HT2, 78SR1, 78ST1, and PT5100 switchers Open frame design minimizes self-heating & pc-board footprint Includes output short-circuit protection and thermal shutdown Low noise output for powering sensitive instrumentation TECHNICAL NOTES New 5.2V model 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 fi lter 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 gener- ate 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 Effi ciency Curves as a guide to select an appropriate slow-blow fuse.

Ordering Information

Part No. Output Voltage Output Current Input Voltage Package Type 78SR-3.3/2-C 3.3Vdc 2.0A 8.0-32Vdc Vertical78SR-5/2-C 5.0Vdc 78SR-5.2/2-C 5.25Vdc 78SRH-3.3/2-C 3.3Vdc Horizontal78SRH-5/2-C 5.0Vdc 78SRH-5.2/2-C 5.25Vdc

www.murata-ps.com/support 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 2 of 6 TECHNICAL NOTES (continued) 3. Input-Output Isolation: 78SR regulators’ internal input and output circuits share a common connection (GND, pin 2), there is no electrical isolation between their 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 where a catastrophic failure occurs, the output voltage may rise to excessively high levels. If the load circuit must be protected against all possible overvoltage situations, voltage-limiting circuitry must be provided externally. 5. Soldering & Handling Precautions: All units are designed to be hand soldered to pc-boards, using lead-free no-clean solders (+260°C, 5 seconds max.). See the Mechanical Specifi cations sec- tion for pin 1 orientation and recommended pc-board hole dimen- sions. 78SR series regulators have limited built-in ESD protection; there- fore they should always be treated as ESD susceptible devices. 6. Horizontal-Pin Models (78SRH): 78SRH switching regulators are pin-compatible replacements for TO-220 style LM78xx linear regula- tors which are installed with their metal tabs or heat sinks laying fl at on the surface of the pc-board. In replacement applications, 78SRH units must be soldered to the pc-board such that the insulating body of diode D1 lies fl at and in contact with the pc-board’s surface. Input/Output Models 78SR-3.3/2-C 78SR-5/2-C 78SR-5.2/2-C Output Voltage 3.3Vdc 5.0Vdc 5.25Vdc Rated Output Current 2.0A 2.0A 2.0A Output Voltage Accuracy ±2% ±2% ±2% Input Voltage Range 8.0-32Vdc 8.0-32Vdc 8.0-32Vdc Line Regulation (100% load) ±0.35% ±0.35% ±0.35% Load Regulation (0-100% load) ±0.2% ±0.2% ±0.2% Quiescent Current (mAdc) 25 typ., 30 max 20 typ., 35max 20 typ., 35max Input Current vs. Input Voltage See Effi ciency Curves Effi ciency See Effi ciency Curves Transient Response See Performance Curves Input & Output Noise See Performance Curves Output Short Circuit Protection ➀ Continuous Input/Output Isolation None Overvoltage Protection None Undervoltage Protection None Environmental Models 78SR-3.3/2-C 78SR-5/2-C 78SR-5.2/2-C Operating Temperature –40 to +70°C Storage Temperature –40 to +85°C Cooling ➂ Free Air Convection Humidity (Non-condensing) 0 to 85% Physical Mechanical See Mechanical Specifi cations Package Open-frame SIP Pins 0.025" (0.64mm) square, tin-plated bronze Weight 0.15 ounces (4.2g) Pin Soldering +260°C for 5 seconds Absolute Maximum Ratings ➁ Input Voltage: +36Vdc Operating Temperature +85°C Output Current 3.0 Amps ➀ 78SR Series regulators can withstand a continuous short-circuit across their output terminals. However, extended short-circuit operation will decrease the unit’s long-term reliability. ➁ These are stress ratings only; Exposure of devices to any of these conditions may ad- versely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi cations Table is not implied. ③ See derating chart for more information. Performance/Functional Specifi cations Typical at TA = +25°C & VIN = 12V, unless otherwise noted

www.murata-ps.com/support 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 3 of 6 Noise and Ripple - 10% and 100% Load, 20 MHz Bandwidth 78SR-3.3/2 Vin = 12V, ILOAD = 2.0A Typical Performance Curves TA = +25°C, VIN as indicated Transient Response - 50% Load Step 78SR-5/2 Vin = 12V, ILOAD = 2.0A 78SR-3.3/2 Vin = 24V, ILOAD = 2.0A 78SR-5/2 Vin = 24V, ILOAD = 2.0A 78SR-5/2 75% to 25% Load Step 78SR-3.3/2 25% to 75% Load Step 78SR-5/2 25% to 75% Load Step 78SR-3.3/2 75% to 25% Load Step 78SR-3.3/2 Vin = 12V, ILOAD = 0.2A 78SR-5/2 Vin = 12V, ILOAD = 0.2A 78SR-3.3/2 25% to 75% Load Step 25% 75% CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. 40μsec/div. 40μsec/div. 40μsec/div. 40μsec/div. 40μsec/div. 40μsec/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. 25% 75% 25% 75% 25% 75% 75% 25% 75% 25% 78SR-5/2 25% to 75% Load Step Vin = 12V Vin = 24V Vin = 12V Vin = 12V Vin = 24V Vin = 12V

www.murata-ps.com/support 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 4 of 6 78SR-3.3/2-C Input Current 78SR-5/2-C Input Current 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 30 35 INPUT CURRENT (AMPS) INPUT VOLTAGE 2.0A LOAD LOAD 0.5A LOAD 1.0A 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 INPUT CURRENT (AMPS) INPUT VOLTAGE 2.0A LOAD LOAD 0.5A LOAD 1.0A 100 100 EFFICIENCY (%) LOAD CURRENT (AMPS) EFFICIENCY (%) LOAD CURRENT (AMPS) Vin = 8V Vin = 12V Vin = 15V Vin = 24V Vin = 28V Vin = 32V Vin = 8V Vin = 12V Vin = 15V Vin = 24V Vin = 28V Vin = 32V 1.25 1.50 1.75 2.00 *Solid lines are for 3.3V and 5.0V models; dashed lines are for 5.2V models. 12 15 24 28 32 36 60ºC OUTPUT CURRENT (AMPS) INPUT VOLTAGE 65ºC 70ºC Thermal Derating Curve* 78SR-3.3/2-C Effi ciency 78SR-5/2-C Effi ciency

www.murata-ps.com/support 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 5 of 6 SHIPPING TRAYS AND BOXES 10.50” REF REF 2.75 11.25” REF EACH FOAM TRAY CONTAINS 63 UNITS. IN FULL MPQ QUANTITIES, THREE TRAYS EQUAL TO A TOTAL OF 189 (3x63) UNITS PER BOX.

www.murata-ps.com/support Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2017 Murata Power Solutions, Inc. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ 78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MPM_78SR-2A.C01 Page 6 of 6 MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) Horizontal Package (H Pin Option) 0.30 (7.6) min. 0.280 (7.1) PC-Board Hole: 0.037 - 0.043 (0.94 - 1.09) Dia. Pins: 0.025 (0.64) sq. 0.100 (2.54) centers OUTPUT (+VOUT) GND INPUT (+VIN) Standard Package 0.85 (21.6) 0.80 (20.3) OUTPUT (+VOUT) PC-Board Hole: 0.037 - 0.043 (0.94 - 1.09) Dia. GND INPUT (+VIN) 0.095 (2.4) Pins: 0.025 (0.64) sq. 0.100 (2.54) centers 0.15 (3.8) Min. 0.16 (4.1) 0.23 (5.7) 0.07 (1.8) $!4%,32 #$!4%,32 123 12 3 L1 L1L1