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SC195 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC195 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 20 page  © 2010 Semtech Corporation POWER MANAGEMENT 1 SC195 3.5MHz, 500mA Synchronous Step Down DC-DC Regulator Features Input Voltage — 2.9V to 5.5V Output Voltage — 0.8V to 3.3V Output current capability — 500mA Efficiency up to 94% 15 Programmable output voltages High light-load efficiency via automatic PSAVE mode Fast transient response Temperature range — -40 to +85°C Oscillator frequency — 3.5MHz 100% duty cycle capability Quiescent current — 38µA typ Shutdown Current — 0.1µA typ Internal soft-start Over-voltage protection Current limit and short circuit protection Over-temperature protection Under-voltage lockout Floating control pin protection MLPQ-UT8 1.5 x 1.5 x 0.6 (mm) package Pb free, halogen free, and RoHS/WEEE compliant Applications Smart phones and cellular phones MP3/Personal media players Personal navigation devices Digital cameras Single Li-ion cell or 3 NiMH/NiCd cell devices Devices with 3.3V or 5V internal power rails Description The SC195 is a high efficiency, 500mA step down regula- tor designed to operate with an input voltage range of 2.9V to 5.5 V. The input voltage range makes it ideal for battery operated applications with space limitations. The SC195 also includes fifteen programmable output voltage settings that can be selected using the four control pins, eliminating the need for external feedback resistors. The output voltage can be fixed to a single setting or dynami- cally switched between different levels. Pulling all four control pins low disables the output. The SC195 operates at a fixed 3.5MHz switching frequency in normal PWM (Pulse-Width Modulation) mode. A vari- able frequency PSAVE (power-save) mode is used to optimize efficiency at light loads for each output setting. Built-in hysteresis prevents chattering between the two modes. The SC195 provides several protection features to safe- guard the device under stressed conditions. These include short circuit protection, over-temperature protec- tion, under-voltage lockout, and soft-start to control in-rush current. These features, coupled with the small 1.5 x 1.5 x 0.6 (mm) package make the SC195 a versatile device ideal for step-down regulation in products needing high efficiency and a small PCB footprint. SC195 IN CTL3 CTL2 CTL1 CTL0 LX OUT GND VOUT 0.8V to 3.3V VIN 2.9V to 5.5V LX 1.0µH COUT 10µF CIN 4.7µF Control Logic Lines Typical Application Circuit June 29, 2010 |
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