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SC561 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC561 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 15 page  POWER MANAGEMENT 1 SC561 Dual Output Low Noise LDO Linear Regulator Features Input voltage range — 2.5V to 5.5V Output voltage — V LDOA = 3.1V; V LDOB = 2.85V Maximum output current — 300mA (each LDO) Dropout at 200mA load — 200mV max. Quiescent supply current — 40μA (both LDOs enabled) Shutdown current — 100nA (typ) Output noise < 50μV RMS PSRR >65dB at 1kHz Over-temperature protection Short-circuit protection Under-voltage lockout Power good monitor for output A MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package Applications PDAs and cellular phones GPS devices Palmtop computers and handheld instruments TFT/LCD applications Wireless handsets Digital cordless phones and PCS phones Personal communicators Wireless LAN Description The SC561 is a dual output, ultra-low dropout linear voltage regulator designed for use in battery powered applications. The SC561 provides fixed output voltages of V LDOA = 3.1V and V LDOB = 2.85V, and up to 300mA of load current per channel. In applications where maximum battery life is essential, the SC561 can operate in an extremely low power state by setting the dynamic bias control. At very light loads, the LOAD pin can be pulled low so that the device consumes only 40μA of quiescent current. The SC561 provides superior low-noise performance by using an external bypass capacitor to filter the bandgap reference. The device also has a PGOOD output to hold a processor in reset when the voltage on OUTA is not in regulation. The device provides protection circuitry such as short- circuit protection, under-voltage lockout, and thermal protection to prevent device failures. Stability is main- tained by using 1μF capacitors on the output pins. The MLPQ-UT8 package and small ceramic bypass capacitors minimize the required PCB area. CIN 2.2μF OUTA OUTB VIN LOAD EN OUTB EN OUTA GND LOAD PGOOD BYP IN SC561 COUTA 1μF COUTB 1μF CBYP 22nF PGOOD Typical Application Circuit November 21, 2007 |
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