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DE-SWADJ Adjustable Switching Voltage Regulator General Description The DE-SWADJ is designed to be the easiest possible way to utilize the benefits of switchmode power when you need an unusual or easily changed voltage. The DE-SWADJ family is pin-compatible with the common 78XX family of linear voltage regulators, and can provide an output from 1.25v to 13v with no external circuitry required. It has integrated decoupling capacitors, so external capacitors are not generally necessary. The DE-SWADJ operates over a wide input voltage range, from 3v to 30v, at up to one amp of continuous output current. Maximum power output is 10W. Efficiencies are up to 92% (Figure 2). Ripple is less than 2% of output. The DE-SWADJ works on a breadboard, making it an ideal solution for prototyping and one-off circuits. Features Drop-in replacement for any of the LM78XX regulators Outputs any voltage between 1.25v and 13v Adjustment is by a 25-turn potentiometer, making it easy to dial in exactly the right output 3 to 30V input voltage Up to 10W output power 1A continuous output current2 Efficiency up to 92% Integrated bypass capacitors Integrated heat sink Weighs only 5.5g Applications Battery powered applications Robots Battery charging and maintenance Point of load voltage regulation Any application needing a nonstandard voltage Overclocking and over or under-volting standard products for more performance or less power draw Figure 1 Typical Performance Characteristics The device can be expected to perform as characterized within these parameters Characteristic Input voltage1 Output Voltage, Min Output Voltage, Max Output Power Output Current (RMS)2 Pulsed Output Current (5 sec) Output Ripple Efficiency (See Figure 2) Transient response in load regulation (0-1A pulses, 1ms, Vp-p) Power dissipation Power output in still air 1 2 Min 3V Typical 1.25v 14v 13v 0A 30mV 55% 100mW 0W 70mV 4% 800mW Max 30V 14.5v 10W 1A 1.5A 100mV 92% 1.2W 10W The sum of input and output voltages must not exceed 40v Limited at high voltages by the max power output – see graph below Absolute Maximum ratings Operation beyond these parameters may permanently damage the device Characteristic Min Input voltage 0V Output Current 0A Power dissipation Ambient Temperature -20C Max 35v 1.5A 1.5W 70C Max Output Current vs Output Voltage 1.2 Max Output Current (A) 1 0.8 0.6 0.4 0.2 0 0 2 4 6 8 Output Voltage (V) 10 12 14 16 Figure 2: Efficiency vs. Input Voltage 12V Output: Efficiency vs Input Voltage 100 90 80 % Efficiency 70 60 200mA 500mA 750mA 50 40 30 20 10 0 14 16 18 20 22 24 26 28 30 Input Voltage 9V Output: Efficiency vs Input Voltage 100 90 80 % Efficiency 70 60 200mA 500mA 50 1000mA 40 30 20 10 0 12 14 16 18 20 22 Input Voltage 24 26 28 30 6V Output: Efficiency vs Input Voltage 100 90 % Efficiency 80 70 60 200mA 500mA 1000mA 50 40 30 20 10 0 8 10 12 14 16 18 20 22 24 26 28 30 Input Voltage 3V Output: Efficiency vs Input Voltage 100 90 80 % Efficiency 70 60 200mA 500mA 1000mA 50 40 30 20 10 0 6 8 10 12 14 16 18 20 Input Voltage 22 24 26 28 30