SRL05A-xx Series Miniature Surface Mount 5A Output, Switching POL Regulators Electrical Specifications Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice. Key Features: • 5A Output Current • Efficiency to 94% • EN 60950 Approved (UL) • Miniature SMT Construction • Wide Input Range • Short Circuit Protected • Thermal Shutdown • Remote On/Off Control • Industry Standard Footprint Input Parameter Conditions Input Voltage Range Under Voltage Lockout, Power Up Under Voltage Lockout, Power Down Input Filter Input Reflected Ripple Current Min. 5V Input 3.0 12V Input 8.3 5V Input 12V Input 5V Input 12V Input Capacitive See Note 1 Typ. 5.0 12.0 2.0 8.0 1.9 7.9 Max. 5.5 14.0 Units VDC VDC VDC 150 mA P-P Output Parameter Output Voltage/Current Output Voltage Tolerance Conditions Min. Typ. See Model Selection Guide Line Regulation, See Note 2 Load Regulation 5V Input 12V Input IOUT = 0% to 100%, VOUT = 3.3 VDC Ripple & Noise (20 MHz) See Note 3 Transient Recovery Time, See Note 4 Transient Response Deviation Temperature Coefficient Short Circuit Protection Over Temperature Protection Overload Protection 50% Load Change Max. Units ±1.5 ±0.4 ±0.2 ±0.5 50 20 200 % ±1.0 ±0.03 Continuous (Hiccup Mode) See Note 5 120 See Note 6 150 % % mV P-P mV RMS µSec % %/°C °C % General Parameter Isolation Voltage Switching Frequency Remote On/Off, See Note 7 Parameter Unit On Unit Off On/Off Current MicroPower Direct Environmental 292 Page Street Suite D Stoughton, MA 02072 USA Parameter Operating Temperature Range Storage Temperature Range Cooling Humidity Physical Size Weight T: (781) 344-8226 F: (781) 344-8481 E: [email protected] W: www.micropowerdirect.com Conditions Min. Not Isolated Fixed Conditions Min. Logic High Logic Low VON/VOFF = 0.0V 0.0 Typ. Max. 300 Units kHz Typ. Max. Open or VIN 0.4 1 Conditions Min. Typ. Max. -40 +25 +85 -55 +125 Free Air Convection (See Derating Curves) RH, Non-condensing 93 Ambient Units VDC mA Units °C °C % 0.80 x 0.45 x 0.24 Inches (20.3 x 11.43 x 6.09 mm) 0.081 Oz (2.3g) Reliability Specifications Parameter MTBF Safety Standards Conditions Min. Typ. MIL HDBK 217F, 25°C, Gnd Benign 1.5 UL 60950, EN 60950 www.micropowerdirect.com Max. Units MHours www.micropowerdirect.com Model Selection Guide Model Number SRL05A-05-3.3 SRL05A-12-5.0 Input Voltage (VDC) Current (mA) Voltage Range Full-Load No-Load (VDC) 949 25 0.75 1,412 30 1.20 1,724 30 1.50 3.0 - 5.5 2,022 35 1.80 2,222 35 2.00 2,217 35 2.50 4.5 - 5.5 3,511 35 3.30 428 20 0.75 625 25 1.20 762 25 1.50 893 30 1.80 8.3 - 14.0 980 30 2.00 1,197 35 2.50 1,545 45 3.30 2,264 50 5.00 Notes: 1. Measured over a bandwidth of 5 Hz to 20 MHz using a 1 µH inductor. 2. Line regulation is measured for a VIN change from low line to high line, with VOUT set to 1.8 VDC. 3. Output ripple is measured at 20 MHz bandwidth using a 1.0 µF ceramic capacitor and a 10 µF tantalum capacitor connected in parallel as close to the output terminals as possible. For the SRL05A-12-5.0, when set for a 5 VDC output, the output ripple and noise is: Peak to Peak 75 mV P - P RMS 45 mV RMS Output Current Current (A, Max) (A, Min) 5.0 0.0 5.0 0.0 Fuse Rating Efficiency Capacitive Load Slow-Blow (%, Typ) 79 85 87 89 90 92 94 73 80 82 84 85 87 89 92 (µF Max) (A) 3,000 10 3,000 7 Remote On/Off These units include an active high On/OFF control input. The unit is “ON” if the input to the control pin (pin 2) is high; or if the pin is left open (or floating). The signal level of the control input is referenced to ground. A recommended drive circuit for the control pin is shown at left. The resistors R1 & R2 have been added to help reduce possible false triggering of the control input due to leakage currents. 4. Transient recovery is measured to within a 1% error band for a 50% load change. 5. These units include a non-latching over temperature protection circuit. If the temperature exceeds approximately 120°C at the monitored “hot spot”, the unit will be shut down. When the temperature decreases, the unit will automatically restart. 6. These units will provide up to 150% of rated current. In the event of an over current fault, the unit will go into hiccup mode until the fault is removed. 7. Standard units feature an active high remote control input. See the note and diagram at right. 8. These units do not include an internal fuse. It is recommended that an external slow-blow fuse be used with a rating as shown in the table above. Output Voltage Trim Units are available with an active low control input. With this input, the unit will remain off if the control input remains above 2.8 VDC. For more information on the active low option, contact the factory. SRL05A-05-3.3 VOUT (VDC) SRL05A-12-5.0 RTRIM (k⍀) VOUT (VDC) 0.75 Open 0.75 Open 1.20 41.71 1.20 22.33 1.50 22.98 1.50 13.00 1.80 14.96 1.80 9.00 2.00 11.75 2.00 7.40 2.50 6.93 2.50 5.00 3.30 3.15 3.30 3.12 3.63 2.20 5.00 1.47 The output voltage of the SRL05A-05-3.3 models is adjustable over the range of 0.75 VDC to 3.63 VDC. The required resistor value for various output levels is given in the table above. To calculate the correct value for a different output level, the formula is: The output voltage level of the SRL05A series is adjustable over a wide range by the simple addition of an external resistor. This trim resistor is connected between the circuit common and the trim input (pin 5), as shown in the diagram above. R TRIM = ( 21, 070 - 5, 110) VOUT - 0.75 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • The output voltage of the SRL05A-12-5.0 models is adjustable over the range of 0.75 VDC to 5.00 VDC. The required resistor value for various output levels is given in the table above. To calculate the correct value for a different output level, the formula is: R TRIM = ( Where: RTRIM = The external trim resistor VOUT = The desired output voltage If a trim resistor is not connected, the output goes to 0.75 VDC. RTRIM (k⍀) 10, 500 - 1, 000) VOUT - 0.75 Where: RTRIM = The external trim resistor VOUT = The desired output voltage If a trim resistor is not connected, the output goes to 0.75 VDC. FAX: (781) 344-8481 • E-Mail: [email protected] www.micropowerdirect.com Derating Curves SRL05A-05-3.3 - VIN = 5 VDC, VOUT = 3.3 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 5.0 VDC SRL05A-05-3.3 - VIN = 5 VDC, VOUT = 2.5 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 3.3 VDC SRL05-05A-3.3 - VIN = 5 VDC, VOUT = 1.8 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 2.5 VDC SRL05A-05-3.3 - VIN = 5 VDC, VOUT = 1.5 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 2.0 VDC SRL05A-05-3.3 - VIN = 5 VDC, VOUT = 1.2 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 1.5 VDC SRL05A-05-3.3 - VIN = 5 VDC, VOUT = 0.75 VDC SRL05A-12-5.0 - VIN = 12 VDC, VOUT = 0.75 VDC Temperature Measurement These switching regulators may be used in a wide variety of thermal environments, but must be properly cooled to ensure long reliable operation. The derating curves shown above are approximations of the ambient temperature and airflow required to maintain the switching regulator temperature below its maximum rating. Airflow should move across the unit, as shown at left. Proper cooling can be verified by measuring the temperature at pin six of Q1 (as shown at left). The thermocouple should be mounted approximately 0.5 in. off the unit board. The temperature at this location should not exceed 110°C. MicroPower Direct • 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: [email protected] www.micropowerdirect.com Typical Connection Notes: Fuse: SRL05A regulators do not include an internal fuse. For safety and protection, a external slow-blow fuse should be placed in the input (+VIN) line. A 10A fuse is recommended for the SRL05A-05 and a 7A fuse for the SRL05A-12. Input Filter: The unit must be connected to a low AC impedance source, and to avoid loop stability issues, the source inductance should also be low. To significantly reduce ripple caused by the switching action of the POL, the SRL05A includes onboard filtering. However, adding input capacitors C1 and C2 will further reduce ripple currents (C1) and high frequency noise spikes (C2). These capacitors should be placed as close to the input pins as possible (see board layout at right). It is recommended that low ESR (<100 m⍀) and low ESL ceramic capacitors be used. Recommended values are: C1 33 µF to 250 µF C2 0.01 µF Remote ON/OFF: See note on page 2 Output Trim: See note on page 2 Output Filter: Output filtering is not required, but may be used to further reduce output ripple & noise; or to adjust the transient response time of the unit. Care must be taken not to exceed 3,000 µF, the maximum value of output capacitance the unit is rated for. The values given in the connection diagram are typical for light filtering. Pin Connections Pin Description 1 +V Input 2 Remote On/Off 4 Common Suggested Board Layout Pin 5 6 Description Trim +V Output This diagram illustrates a simple board layout for use with the SRL05A series. As recommended, external components are placed as close to the unit as possible. To help shield external circuitry, the ground plane has been extended under the unit. Any signal traces should not be routed underneath the unit (unless they are on a layer under the ground plane) to avoid unwanted noise interference. Mechanical Dimensions Suggested Solder Reflow Profile MicroPower Direct We Power Your Success - For Less! 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • Notes: • All dimensions are typical in inches (mm) • Tolerance x.xx = ±0.02 (±0.50) FAX: (781) 344-8481 • E-Mail: [email protected]