SC2738 Datasheet | SEMTECH

Description The SC2738 is an ultra low output voltage dual power supply controller designed to simplify power management for desktop PCs and graphics cards. It is part of Semtech’s Smart LDOTM family of products. The SC2738 has two user adjustable outputs that can be set anywhere between 0.5V and 3.3V (VIN = 12V, anywhere between 0.5V and 1.8V for VIN = 5V) using two external resistors per output. SC2738 Features for each output include tight output voltage regulation (±3.5% over -40°C to +85°C), 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 SC2738 is available in an MSOP-10 surface mount package. Features ‹ ±3.5% reference voltage ‹ 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 Applications ‹ Desktop PCs ‹ Graphics cards ‹ Simple dual power supplies Typical Application Circuit 5V or 12V IN VIN1 C1 0.1u F (1) 8 1 C3 Q1 7 6 5 3 C4 C2 0.1u F (1) VIN2 VOUT1 VOUT2 100u F, 25m Ohm POSCAP R1 11.0k R5 2k (2) 1 2 U1 DRV1 ADJ1 EN1 PGD1 GND SC2738 IN DRV2 ADJ2 EN2 PGD2 10 9 8 7 6 C6 0.1u F C7 10n F (2) R6 2k (2) R3 20.0k 100u F, 25m Ohm POSCAP OUT1 Enable OUT1 Power Good 3 4 5 R2 10.0k C5 10n F (2) OUT2...