SC561 Dual Output Low Noise LDO Linear Regulator POWER MANAGEMENT Features Description The SC561 is a dual output, ultra-low dropout linear Input voltage range 2.5V to 5.5V voltage regulator designed for use in battery powered Output voltage V = 3.1V V = 2.85V LDOA LDOB applications. The SC561 provides fi xed output voltages of Maximum output current 300mA (each LDO) V = 3.1V and V = 2.85V, and up to 300mA of load Dropout at 200mA load 200mV max. LDOA LDOB current per channel. Quiescent supply current 40A (both LDOs enabled) In applications where maximum battery life is essential, Shutdown current 100nA (typ) the SC561 can operate in an extremely low power state by Output noise < 50V RMS setting the dynamic bias control. At very light loads, the PSRR >65dB at 1kHz LOAD pin can be pulled low so that the device consumes Over-temperature protection only 40A of quiescent current. Short-circuit protection Under-voltage lockout The SC561 provides superior low-noise performance by Power good monitor for output A using an external bypass capacitor to fi lter the bandgap MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package reference. The device also has a PGOOD output to hold a processor in reset when the voltage on OUTA is not in Applications regulation. PDAs and cellular phones The device provides protection circuitry such as short- GPS devices circuit protection, under-voltage lockout, and thermal Palmtop computers and handheld instruments protection to prevent device failures. Stability is main- TFT/LCD applications tained by using 1F capacitors on the output pins. The Wireless handsets MLPQ-UT8 package and small ceramic bypass capacitors Digital cordless phones and PCS phones minimize the required PCB area. Personal communicators Wireless LAN Typical Application Circuit SC561 PGOOD VIN IN PGOOD OUTA EN OUTA EN OUTB LOAD OUTB LOAD C IN C C C BYP OUTA OUTB BYP GND 2.2 F 1 F 22nF 1 F November 21, 2007 1SC561 Pin Confi guration Ordering Information Device Package (1)(2) SC561ULTRT MLPQ-UT8 1.51.5 PGOOD SC561EVB Evaluation Board 8 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. OUTB 1 BYP 7 (2) Lead-free package only. Device is WEEE and RoHS compliant. TOP VIEW IN 2 6 EN 3 OUTA GND 5 4 LOAD MLPQ-UT-8 1.5x1.5, 8 LEAD = 157C/W JA Voltage Options Marking Information Output Voltage Part Options Device Number Code V V LDOA LDOB SC561 3.1 2.85 0V nn yw nn = Part No. Code See the Voltage Options Table for details yw = Datecode See package marking design guidelines document ALOW-693AQX 2