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SC338IMSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC338IMSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 14 page 1 www.semtech.com SC338(A) Ultra Low Output Voltage Dual Linear FET Controller POWER MANAGEMENT Revision: November 12, 2004 Description Features The SC338(A) is an ultra low output voltage dual power supply controller designed to simplify power management for notebook PCs. It is part of Semtech’s Smart LDOTM family of products. The SC338(A) has two user adjustable outputs that can be set anywhere between 0.5V and 3.3V (V IN = 12V, anywhere between 0.5V and 1.8V for V IN = 5V) using two external resistors per output. SC338(A) features for each output include tight output voltage regulation (±2.5% over -40°C to +85°C for SC338, ±1.5% over 0°C to +85°C for SC338A), enable controls, open drain power good signals, under-voltage protection and soft start. The enable pins allow the part to enter a very low power standby mode. Pulling them high enables the outputs. The power good pins are open drain and assert low when the voltage at their respective adjust pins is below 88% (typ.) of nominal. If the voltage at the adjust pin is below 50% (typ.) of nominal, the under voltage protection circuitry will shut down that output. The SC338(A) is available in an MSOP-10 surface mount package. ±1.5% and ±2.5% reference voltage options available Two independant and fully adjustable outputs Wide supply voltage range permits operation from 5V or 12V rails Very low quiescent current (500µA typical with both outputs enabled and 5V input) Indivdual Enable control for each output Individual Power Good monitoring and signalling for each output Gate drives from input supply enable use of N-channel MOSFETs User selectable dropout voltage Individual under-voltage protection for each output MSOP-10 surface mount package Notebook PCs Simple dual power supplies Typical Application Circuit Applications 1.05V Enable R3 20.0k 1.05V Power Good U1 SC338(A) 1 2 3 4 5 6 7 8 9 10 DRV1 ADJ1 EN1 PGD1 GND PGD2 EN2 ADJ2 DRV2 IN C1 0.1uF (1) 1.8V +/-5% IN R4 10.0k R6 2k (2) C5 10nF (2) 1.5V Enable 1.05V @ 3A 1.2V +/-5% IN Notes: (1) Additional capacitance may be required if far from supply (2) Optional soft-start components C6 0.1uF Q1 IRF7311 4 1 2 3 5 6 7 8 1.5V @ 1.5A or similar 1.5V Power Good C7 10nF (2) C3 100uF, 25mOhm POSCAP C4 100uF, 25mOhm POSCAP R1 11.0k 5V or 12V IN R5 2k (2) C2 0.1uF (1) R2 10.0k + • = 2 R 1 R 1 5 . 0 V 1 OUT + • = 4 R 3 R 1 5 . 0 V 2 OUT |
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