EZ1580/EZ1581  
					EZ1582/EZ1583  
					Dual Input Low Dropout Regulator  
					POWER MANAGEMENT  
					Description  
					Features  
					The EZ158X family of high performance positive voltage  
					regulators are designed for use in applications requiring  
					very low dropout voltage at up to 7, 5, 3 and 1.5 amps.  
					Capable of supplying up to 2.8V on boards where both  
					5V and 3.3V supplies are available, the superior dropout  
					characteristics of the EZ158X result in reduced heat  
					dissipation compared to regular LDOs. This allows for  
					heatsink size reduction or elimination. Additionally, the  
					EZ158X provides excellent regulation over variations in  
					line, load and temperature. Remote sense operation  
					allows compensating for trace, connector and other  
					resistive losses.  
					 540mV dropout @ 7A in dual supply mode  
					(EZ1580)  
					 Remote sense operation  
					 Fast transient response  
					 0.5% initial accuracy  
					 Line regulation typically 0.08%  
					 Load regulation typically 0.08%  
					 5 Pin TO-220 and TO-263 packages  
					Applications  
					 Microprocessor supplies  
					 Split plane microprocessor supplies  
					 Advanced graphics cards  
					 Sound cards  
					 Low voltage logic supplies  
					 Switching power supply post regulation  
					Outstanding features include very low dropout  
					performance at rated current, fast transient response,  
					remote sense, internal current limiting, thermal shutdown  
					and safe operating area protection of the output device.  
					The EZ158X is a five terminal adjustable or fixed 2.5V  
					voltage regulator available in the popular 5 pin TO-220  
					and TO-263 plastic packages.  
					Typical Application Circuits  
					Adjustable Output Parts(3)  
					U1  
					EZ158XCX  
					OUT  
					1
					SNS  
					VREF  
					5
					4
					3.3V POWER IN  
					5V CONTROL IN  
					PWR  
					CTL  
					3
					2.5V OUT  
					R2  
					R1  
					
					
					
					
					ADJ  
					R1  
					VOUT = V  
					1+  
					+ I  
					• R2  
					124  
					REF   
					ADJ  
					C1  
					C2  
					C3  
					
					2
					33uF  
					10uF  
					68uF  
					R2  
					124  
					GROUND  
					GROUND  
					Fixed Output Parts  
					U1  
					EZ158XCX-2.5  
					1
					SNS  
					5
					4
					3.3V POWER IN  
					5V CONTROL IN  
					PWR  
					CTL  
					3
					2.5V OUT  
					OUT  
					GND  
					2
					C1  
					33uF  
					C2  
					C3  
					68uF  
					10uF  
					GROUND  
					GROUND  
					Notes:  
					(1) Capacitor values are for reference only. Good quality, low ESR tantalum or aluminum electrolytic capacitors  
					should be used. Increasing the value of the output capacitor will improve the overall transient response.  
					(2) If the same voltage is input to both PWR and CTL, then the dropout voltage will become 1.3V maximum.  
					(3) A small (~0.033µF) capacitor can be used to bypass the ADJ pin to improve transient response, if needed.  
					June 23, 2010  
					1
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