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SC1458 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1458 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 13 page  POWER MANAGEMENT 1 SC1458 Dual Output Low Noise LDO Linear Regulator Features Input voltage range — 2.5 to 5.5V Output voltages — 2.8V and 1.8V (SC1458A), 2.85V and 2.85V (SC1458B) Maximum output current — 300mA (each LDO) Low 200mV maximum dropout at 200mA load Quiescent current — 100μA (both LDOs enabled) Shutdown current — 100nA Output noise < 50μV RMS (SC1458B) PSRR > 65dB at 1kHz (SC1458B) Space saving package — MLPD-W6, 3mm x 3mm Over-temperature protection Short-circuit protection Under-voltage lockout Reset monitor for output A (SC1458A) 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 Two-way pagers Wireless LAN Description The SC1458 is a family of dual output, ultra-low dropout linear voltage regulators designed for use in battery powered wireless applications. Both versions of the SC1458 require an input voltage level between 2.5V and 5.5V. The SC1458A supplies 2.5V on OUTA and 1.8V on OUTB, while SC1458B supplies 2.85V on both outputs. (For other voltage options see the SC560). The SC1458A provides a PGOOD output to hold a processor in reset when the voltage on OUTA is not in regulation. The SC1458B provides superior low-noise performance by using an external bypass capacitor to filter the bandgap reference. Both versions have a single enable pin that controls both LDO outputs. The startup sequence delays the start of OUTB by 128μs after OUTA is enabled. Each version also provides protection circuitry such as current limiting, under-voltage lockout, and thermal protection to prevent device failures. Stability is maintained by using 1μF capacitors on the output pins. The MLPD package and 0402 ceramic capacitors minimize the required PCB area. SC1458A CIN COUTA COUTB 2.2μF 1μF 1μF To μP OUTA 2.5V, 300mA OUTB 1.8V, 300mA VIN From μP OUTB VIN OUTA GND PGOOD EN Typical Application Circuit September 12, 2007 |
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