OKL-T-3-W5

www.murata-ps.com PRODUCT OVERVIEW The OKL-T/3-W5 series are miniature non-isolated Point-of-Load (PoL) DC/DC power converters for embedded applications. The tiny form factor is configured on a Land Grid Array (LGA) assembly measuring only 0.48 x 0.48 x 0.244 inches max. (12.2 x 12.2 x 6.2 mm max.). The wide input range is 2.4 to 5.5 Volts DC. The maximum output current is 3 Amps. Based on fixed-frequency synchronous buck converter switching topology, the high power conversion OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs Typical Typical unit efficient Point of Load (PoL) module features programmable output voltage and On/Off control. These converters also include under voltage lock out (UVLO), output short circuit protection, overcurrent and over temperature protections. An optional sequence/tracking feature allows power sequencing of PoL’s. These units meet all standard UL/EN/IEC 60950-1 safety certifications (2nd Edition) and RoHS-6 hazardous substance compliance. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ iLGA inspectable Land Grid Array 2.4-5.5Vdc input voltage range Programmable output voltage from 0.6-3.63Vdc Drives 200 μF ceramic capacitive loads High power conversion efficiency at 95.3% Outstanding thermal derating performance Over temperature and over current protection On/Off control Meets UL/EN/IEC 60950-1 safety, 2nd Edition RoHS-6 hazardous substance compliance Sequence/Tracking operation (optional) Contents Description, Connection Diagram, Photograph Ordering Guide, Model Numbering, Product Label Mechanical Specifications, Input/Output Pinout Detailed Electrical Specifications Output Voltage Adjustment, Application Notes Performance Data and Oscillograms Tape and Reel Information Page 1 2 3 4 5 8 15 Connection Diagram +Vin F1 +Vout On/Off Control Sense Controller External DC Power Source Trim Open = On Closed = Off ( Positive On/Off) Common Reference and Error Amplifier Common Sequence/Tracking (OKL2 Models) Figure 1. OKL-T/3-W5 Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. 　 For full details go to www.murata-ps.com/rohs www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 1 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs Performance Specifications and Ordering Guide ORDERING GUIDE Input Efficiency Regulation (max.) Vin nom. Range Iin, no load Iin, full load Vout Iout (Amps, Power R/N (mV p-p) (Volts) ➀ max.) (Watts) Max. ➃ (Volts) (Volts) (mA) ➃ (Amps) ➁ Min. Typ. Line Load 0.6-3.63 0.6-3.63 0.6-3.63 0.6-3.63 3 3 3 3 9.9 9.9 9.9 9.9 25 25 25 25 ±0.25% ±0.25% ±0.25% ±0.25% ±0.25% ±0.25% ±0.25% ±0.25% 5 5 5 5 2.4-5.5 2.4-5.5 2.4-5.5 2.4-5.5 25 25 25 25 2.08 2.08 2.08 2.08 Sequence/ Tracking no no yes yes On/Off Polarity Output Package - Pinout P83 Case C83 inches (mm) 0.48x0.48x0.244 max (12.2x12.2x6.2) max 0.48x0.48x0.244 max (12.2x12.2x6.2) max 0.48x0.48x0.244 max (12.2x12.2x6.2) max 0.48x0.48x0.244 max (12.2x12.2x6.2) max Model Number OKL-T/3-W5P-C OKL-T/3-W5N-C OKL2-T/3-W5P-C OKL2-T/3-W5N-C ➀ ➁ 93.3% 95.3% Pos. 93.3% 95.3% Neg. 93.3% 95.3% Pos. 93.3% 95.3% Neg. The output range is limited by Vin. See detailed specs. All specifications are at nominal line voltage, Vout=nominal (3.3V) and full load, +25 deg.C. unless otherwise noted. Output capacitors are 10 μF ceramic. Input cap is 22 μF. See detailed specifications. I/O caps are necessary for our test equipment and may not be needed for your application. ➂ Use adequate ground plane and copper thickness adjacent to the converter. f Ripple and Noise (R/N) and no-load input current are shown at Vout=1V. See specs for details. PART NUMBER STRUCTURE OK L 2 - T / 3 - W5 N - C Okami Non-isolated PoL LGA Surface Mount Sequence/tracking Blank = Not installed 2 = Installed Trimmable Output Voltage Range 0.6-3.63Vdc RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder) On/Off Polarity P = Positive Polarity N = Negative Polarity Input Voltage Range 2.4-5.5Vdc Maximum Rated Output Current in Amps Product Label Because of the small size of these products, the product label contains a character-reduced code to indicate the model number and manufacturing date code. Not all items on the label are always used. Please note that the label differs from the product photograph. Here is the layout of the label: Model Number OKL-T/3-W5P-C OKL-T/3-W5N-C OKL2-T/3-W5P-C OKL2-T/3-W5N-C Mfg. date code XXXXXX YMDX Rev. Product code Revision level Product Code L01003 L00003 L21003 L20003 The manufacturing date code is four characters: First character – Last digit of manufacturing year, example 2009 Second character – Month code (1 through 9 and O through D) Third character – Day code (1 through 9 = 1 to 9, 10=O and 11 through 31 = A through Z) Fourth character – Manufacturing information Figure 2. Label Artwork Layout The label contains three rows of information: First row – Murata Power Solutions logo Second row – Model number product code (see table) Third row – Manufacturing date code and revision level www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 2 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs MECHANICAL SPECIFICATIONS Top View INPUT/OUTPUT CONNECTIONS 0.48 (12.19) Bottom View 0.48 (12.19) Side View Pin 1 2 3 4 5 6 7 8 9 10 11 12 Function On/Off Control* VIN Ground VOUT Sense Trim Ground NC Sequence/Tracking NC NC NC *The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) polarity 0.244 (6.2) max. End View Recommended Footprint -through the Board0.480 (12.19) 0.135 0.180 (3.43) (4.57) 0.045 (1.14) 2 Vin Vout 0.480 REF (12.19) Gnd Vin On/Off C L C L 1 On/Off 0.090 (2.29) 10 9 Seq 12 0.150 (3.81) 7 0.240 (6.10) 8 0.420 (10.67) 0.330 (8.38) NC Gnd 8 7 NC 12 Dimensions are in inches (mm shown for ref. only). Third Angle Projection Bottom View 0.060 (1.52) 0.195 (4.95) 0.375 (9.53) 0.070 x 0.160 x3 (1.77 x 4.07) 4 0 4 0.420 (10.67) 0.375 (9.53) 5 11 0.150 (3.81) 6 0.060 (1.52) 0 Trim 3 2 3 Gnd Vout Sense NC 0.240 (6.10) Sense NC NC Gnd 1 10 0.180 (4.57) 0.135 (3.43) 5 11 6 0.180 (4.57) NC Seq 9 Trim 0.090 (2.29) 0.180 0.090 (4.57) (2.29) 0.040 x 0.040 x9 (1.01 x 1.01) Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Figure 3. OKL-T/3-W5 Mechanical Outline Components are shown for reference only. www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 3 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs Performance and Functional Specifications See Note 1 Input (Vin on or On/Off to Vout regulated) Switching Frequency 6 mSec for Vout=nominal (Remote On/Off) 600 KHz Environmental Input Voltage Range Isolation Start-Up Voltage Undervoltage Shutdown (see Note 15) Overvoltage Shutdown Reflected (Back) Ripple Current (Note 2) Internal Input Filter Type Recommended External Fuse Reverse Polarity Protection Input Current: Full Load Conditions Inrush Transient Shutdown Mode (Off, UV, OT) Output in Short Circuit Low Line (Vin=Vmin) Remote On/Off Control (Note 5) Negative Logic Positive Logic See Ordering Guide and Note 7. Not isolated 2.05 V 1.92 V None TBD mA pk-pk Capacitive TBD None. See fuse information. See Ordering Guide TBD A2Sec. 1 mA 10 mA 1.48 A. ON = Open pin or -0.2V to Vin -1.6V max. OFF = Vin -0.8V min. to +Vin ON = Open pin (internally pulled up) or +1.2V to +Vin max. OFF = -0.3V to +0.3V max. or ground TBD 2 Volts per millisecond, max. Vout = ±100 mV of Sequence In Vout = ±100 mV of Sequence In Calculated MTBF (hours) Telecordia method (4a) Calculated MTBF (hours) MIL-HDBK-217N2 method (4b) OKL Models 10,820,000 5,999,000 OKL2 Models 5,229,000 5,176,000 Operating Temperature Range (Ambient, all output ranges) See derating curves -40 to +85 ˚C. with derating (Note 9) Storage Temperature Range -55 to +125 deg. C. Thermal Protection/Shutdown Included in PWM Relative Humidity To 85%/+85 ˚C., non-condensing Physical Outline Dimensions Weight Safety See Mechanical Specifications 0.06 ounces (1.6 grams) Meets UL/cUL 60950-1, CSAC22.2 No. 60950-1, IEC/EN 60950-1, 2nd Edition RoHS-6 (does not claim EU RoHS exemption Restriction of Hazardous Substances 7b–lead in solder) Absolute Maximum Ratings Current Tracking/Sequencing (optional) Slew Rate Tracking accuracy, rising input Tracking accuracy, falling input Input Voltage (Continuous or transient) On/Off Control Input Reverse Polarity Protection Output Current (Note 7) Output Output Power Output Voltage Range Minimum Loading Accuracy (50% load, untrimmed) Voltage Output Range (Note 13) Overvoltage Protection (Note 16) Temperature Coefficient Ripple/Noise (20 MHz bandwidth) Line/Load Regulation Efficiency Maximum Capacitive Loading (Note 14) Cap-ESR=0.001 to 0.01 Ohms Cap-ESR >0.01 Ohms Current Limit Inception (Note 6) (98% of Vout setting, after warm up) Short Circuit Mode Short Circuit Current Output Protection Method Short Circuit Duration Prebias Startup 9.9W max. See Ordering Guide No minimum load ±2.5 % of Vnominal See Ordering Guide None TBD See Ordering Guide and note 8 See Ordering Guide and note 10 See Ordering Guide 200 μF TBD 8 Amps 10 mA Hiccup autorecovery upon overload removal. (Note 17) Continuous, no damage (output shorted to ground) Converter will start up if the external output voltage is less than Vnominal. 0 V. to +6 Volts max. 0 V. min. to +Vin max. See Fuse section Current-limited. Devices can withstand a sustained short circuit without damage. The outputs are not intended to accept appreciable reverse current. Storage Temperature -55 to +125 ˚C. Lead Temperature See soldering specifications Absolute maximums are stress ratings. Exposure of devices to greater than any of any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied nor recommended. Specification Notes: (1) Specifications are typical at +25 °C, Vin=nominal (+5V), Vout=nominal (+3.3V), full load, external caps and natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced airflow. All models are tested and specified with external 10μF ceramic output capacitors and a 22 μF external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. However, Murata Power Solutions recommends installation of these capacitors. All models are stable and regulate within spec under no-load conditions. (2) (3) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 μF ceramic, Cbus=1000 μF electrolytic, Lbus=1 μH. Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. (4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. (4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25ºC., full output load, natural convection. (5) The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to -Input Common. A logic gate may also be used by applying appropriate external voltages which do not exceed +Vin. Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Dynamic Characteristics (6) Dynamic Load Response (50-100% load step, di/dt=1A/μSec) Peak Deviation Start-Up Time 50μSec max. to within ±2% of final value (Note 1) ±250 mV 6 mSec for Vout=nominal (Vin On) www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 4 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs Specification Notes, Cont.: (7) (8) Please observe the voltage input and output specifications in the Voltage Range Graph on page 7. Output noise may be further reduced by adding an external filter. At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. All models are fully operational and meet published specifications, including “cold start” at –40˚ C. APPLICATION NOTES (9) (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) Other input or output voltage ranges will be reviewed under scheduled quantity special order. (12) Maximum PC board temperature is measured with the sensor in the center of the converter. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will reduce output noise but may change the transient response. Newer ceramic caps with very low ESR may require lower capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please refer to the Output Capacitive Load Application Note. (15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times. Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will attempt to recover when the input is brought back into normal operating range. (16) The outputs are not intended to sink appreciable reverse current. (17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation. Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not currentlimited. For greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. The installer must observe all relevant safety standards and regulations. For safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. IEC/EN/UL 60950-1. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout Start-Up Time (see Specifications) is the time interval between the point when the ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit to moderate the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Remote Control interval from On command to Vout regulated assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specification such as external load capacitance and soft start circuitry. Recommended Input Filtering The user must assure that the input source has low AC impedance to provide dynamic stability and that the input supply has little or no inductive content, including long distributed wiring to a remote power supply. The converter will operate with no additional external capacitance if these conditions are met. Output Voltage Adustment The output voltage may be adjusted over a limited range by connecting an external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim resistor must be a 1/10 Watt precision metal film type, ±0.5% accuracy or better with low temperature coefficient, ±100 ppm/oC. or better. Mount the resistor close to the converter with very short leads or use a surface mount trim resistor. In the tables below, the calculated resistance is given. Do not exceed the specified limits of the output voltage or the converter’s maximum power rating when applying these resistors. Also, avoid high noise at the Trim input. However, to prevent instability, you should never connect any capacitors to Trim. OKL-T/3-W5 Output Voltage 3.3 V. 2.5 V. 2.0 V. 1.8 V. 1.5 V. 1.2 V. 1.0 V. 0.6 V. Calculated Rtrim (KΩ) 0.44 0.63 0.86 1.0 1.33 2.0 3.0 ∞ (open) Resistor Trim Equation, OKL-T/3-W5 models: 1.2 RTRIM (k:) = _____________ VOUT – 0.6 www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 5 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter’s input terminals. The capacitor should be a ceramic type such as the Murata GRM32 series or a polymer type. Initial suggested capacitor values are 10 to 22 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. More input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. Recommended Output Filtering The converter will achieve its rated output ripple and noise with no additional external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in parallel. Mount these close to the converter. Measure the output ripple under your load conditions. Use only as much capacitance as required to achieve your ripple and noise objectives. Excessive capacitance can make step load recovery sluggish or possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications. Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/ output components, circuits and layout as shown in the figures below. The Cbus and Lbus components simulate a typical DC voltage bus. Please note that the values of Cin, Lbus and Cbus will vary according to the specific converter model. TO OSCILLOSCOPE COPPER STRIP +OUTPUT C1 C2 SCOPE RLOAD -OUTPUT COPPER STRIP C1 = 1μF CERAMIC C2 = 10μF CERAMIC LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 5: Measuring Output Ripple and Noise (PARD) Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in the next section illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates (below about 25 LFM) are similar to “natural convection”, that is, not using fan-forced airflow. Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. CURRENT PROBE +INPUT LBUS CBUS CIN VIN + – + – -INPUT CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz CBUS = 1000μF, ESR < 100mΩ @ 100kHz LBUS = 1μH Figure 4: Measuring Input Ripple Current In figure 5, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit errors and standardize tests between units, scope measurements should be made using BNC connectors or the probe ground should not exceed one half inch and soldered directly to the test circuit. Minimum Output Loading Requirements All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. www.murata-ps.com 12 May 2010 email: sales@murata-ps.com MDC_OKL-T/3-W5 Series.A03 Page 6 of 15 OKL-T/3-W5 Series Programmable Output 3-Amp iLGA SMT PoLs Output Current Limiting Current limiting inception is defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value in normal operation as long as the average output power is not exceeded. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low (approximately 98% of nominal output voltage for most models), the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart, causing the output voltage to begin ramping up to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. A short circuit can be tolerated indefinitely. The “hiccup” system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. The system will automatically restore operation as soon as the short circuit condition is removed. Remote On/Off Control The remote On/Off Control can be ordered with either polarity. Please refer to the Connection Diagram on page 1 for On/Off connections. Positive polarity models are enabled when the On/Off pin is left open or is pulled high to +Vin with respect to –Vin. An internal bias current causes the open pin to rise to +Vin. Positive-polarity devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin. Negative polarity devices are on (enabled) when the On/Off is open or brought to within a low voltage (see Specifications) with respect to –Vin. The device is off (disabled) when the On/Off is pulled high with respect to –Vin (see specifications). Dynamic control of the On/Off function should be able to sink appropriate signal current when brought low and withstand appropriate voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. Output Capacitive Load These converters do not require external capacitance added to achieve rated specifications. Users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. Install only enough capacitance to achieve noise objectives. Excess external capacitance may cause regulation problems, degraded transient response and possible oscillation or instability. Voltage Range Graph Please observe the limits below for voltage input and output ranges. These limits apply at all output currents. 6 5 Input Voltage (V) 4 3 2 1 0 0.5 1 1.5 2 2.5 3 3.5 Output Voltage (V) Upper Limit Lower Limit Vin=2.4V / Vout=1.8V Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ therefore please thoroughly review these guidelines with your process engineers. Reflow Solder Operations for surface-mount products (SMT) For Sn/Ag/Cu based solders: Preheat Temperature Time over Liquidus Maximum Peak Temperature Cooling Rate For Sn/Pb based solders: Preheat Temperature Time over Liquidus Maximum Peak Temperature Cooling Rate Less than 1 ºC. per second 60 to 75 seconds 235 ºC. Less than 3 ºC. per second Less than 1 ºC. per second 45 to 75 seconds 260 ºC. Less than 3 ºC. per second Recommended Lead-free Solder Reflow Profile 250 Peak Temp. 235-260° C 200 Temperature (°C) 150 Soaking Zone 120 sec max 100