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SC2620EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2620EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 26 page  1 www.semtech.com SC2620 Dual 2A, 30V Step-down Regulator with Programmable Frequency up to 1.4MHz POWER MANAGEMENT Revision: July 30, 2008 Description Features Applications Typical Application Circuit Wide Input Voltage Range 2.8V to 30V Up to 1.4MHz/Channel Programmable Switching Frequency Current-mode Control Out of Phase Switching Reduces Ripple Cycle-by-cycle Current-limiting Independent Shutdown/soft-start Pins Independent Hiccup Overload Protection Channel 1 Power Good Indicator Two 2.3A Integrated Switches Thermal Shutdown Thermally Enhanced SO-16 Lead Free Package Fully WEEE and RoHS Compliant The SC2620 is a constant frequency dual current-mode switching regulator with integrated 2.3A, 30V switches. Its switching frequency can be programmed up to 1.4MHz per channel. Due to the SC2620’s high frequency operation, small inductors and ceramic capacitors can be used, resulting in very compact power supplies. The two channels of the SC2620 operate at 180° out of phase for reduced input voltage ripples. Separate soft start/enable pins allow independent control of each channel. Channel 1 power good indicator can be used for output start up sequencing to prevent latch-up. Current-mode PWM control achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduce power dissipation during overload. XDSL and Cable Modems Set-top Boxes Point of Load Applications CPE Equipment DSP Power Supplies C15 10 µF SC2620 GND SS2 PVIN SW1 FB2 COMP2 C9 33pF R7 10.5k BOOST1 C1 22 µF BOOST2 SW2 L1 10 µH C2 0.1 µF L2 6.8 µH C4 0.1 µF PGOOD1 SS1 COMP1 FB1 C3 22 µF D1 UPS120 D2 UPS120 1.2V/2A 13k R4 R3 2.61k 13k R2 R1 30.1k C7 22nF C10 22nF C8 4.7nF C6 47pF R5 12.7k C5 1.5nF D4 1N4148 L1 & L2: Coiltr onics DR73 OUT2 OUT1 3.3V/2A D3 1N4148 9V-16V VIN VIN ROSC R9 46.4k 10 R10 C16 0.1 µF C1 & C3: Murata GRM21BR60J 226M C15: Murata GRM32DR61E106K Figure 1(a). 550kHz 9V-16V V IN to 3.3V and 1.2V Step- down Converter. Channel 1 reaches regulation. Figure 1(b). V IN Start-up Transient (IOUT1= 1.5A, IOUT2= 4ms/div CH1 : OUT1 Voltage, 2V/div CH2 : OUT2 Voltage, 1V/div CH3 : SS2 Voltage, 2V/div CH1 CH2 CH3 V IN = 1 2 V 0.8A). Channel 2 start is delayed until |
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