Semtech SC283

Description

The SC283 is a dual channel 1.8A synchronous step-down regulator designed to operate with an input voltage range of 2.9 to 5.5 Volts. Each channel offers fifteen pre-determined output voltages via four control pins programmable from 0.8 to 3.3 Volts. The control pins allow for on-the-fly voltage changes, enabling system designers to implement dynamic power savings. The SC283 is also capable of adjusting the output voltage via an external resistor divider.The device operates with a fixed 2.5MHz oscillator frequency, allowing the use of small surface mount external components.Connecting CTL0 — CTL3 to logic low forces the device into shutdown mode reducing the supply current to less than 1μA. Connecting any of the control pins to logic high enables the converter and sets the output voltage according to Table 1. Other features include under-voltage lockout, soft-start to limit inrush current, and over-temperature protection.The SC283 is available in a thermally-enhanced, 2mm x 3mm x 0.8mm MLPQ-W18 package and has a rated temperature range of -40 to +85°C.

Features

• VIN Range: 2.9 – 5.5V
• VOUT Selectable: 0.8 - 3.3V
• Up to 1.8A Output Current for Each Channel
• Ultra-Small Footprint, <1mm Height Solution
• 2.5MHz Switching Frequency
• Efficiency Up to 93%
• Low Output Noise Across Load Range
• Excellent Transient Response
• Start Up into Pre-Bias Output
• 100% Duty-Cycle Low Dropout Operation
• <1μA Shutdown Current
• Internal Soft Start
• Input Under-Voltage Lockout
• Output Over-Voltage, Current Limit Protection
• Over-Temperature Protection
• Adjustable Output Voltage
• 2mm x 3mm x 0.8mm thermally enhanced MLPQ-W18 package
• -40 to +85°C Temperature Range
• Pb-Free product. RoHS/WEEE and Halogen Free compliant

Typical applications

• Printer
• Network Cards
• LCD TV
• Set-Top Box
• Desktop Computing

More information

• Datasheet
• IC product information