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SC2443EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2443EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  Dual-Phase Single or Two Output Synchronous Step-Down Controller SC2443 POWER MANAGEMENT Aug. 2008 1 Typical Application Circuit Features u Wide input voltage range: 4.7V to 16V u 0.5V feedback voltage for low-voltage outputs u Programmable frequency up to 1 MHz per phase u 2-Phase synchronous continuous conduction mode for high efficiency step-down converters u Out-of-phase operation for low input current ripples u Output source and sink currents u Fixed frequency peak current-mode control u 75mV/-110mV maximum current sense voltage u Inductor DCR current-sensing for low-cost applications u Dual outputs or 2-phase single output operation u Excellent current sharing between individual phases u Individual soft-start, overload shutdown and enable u External reference input for DDR applications u External synchronization u Industrial temperature range u 4mm X 4mm X1mm 24-lead MLPQ package Description The SC2443 is a high-frequency dual synchronous step-down switching power supply controller. It provides out-of-phase high-current output gate drives to all N-channel MOSFET power stages. The SC2443 operates in synchronous continuous-con- duction mode. Both phases are capable of maintaining regula- tion with sourcing or sinking load currents, making the SC2443 suitable for generating both VDDQ and the tracking VTT for DDR applications. The SC2443 employs fixed frequency peak current-mode con- trol for the ease of frequency compensation and fast transient response. The dual-phase step-down controllers of the SC2443 can be used to produce two individually controlled and regulated out- puts or a single output with shared current in each phase. The Step-down controllers operate from an input of at least 4.7V and are capable of regulating outputs as low as 0.5V Individual soft-start and overload shutdown timer is included in each step-down controller. The SC2443 implements hiccup overload protection. In single output current share configura- tion, the master timer controls the soft-start and overload shut- down functions of both controllers. Applications u Telecommunication power supplies u DDR memory power supplies u Graphic power supplies u Servers and base stations VOUT1 IN2- VP1 VIN VIN VOUT1 IN2- VP1 VIN IN1- U1 SC2443 1 2 3 4 5 6 13 14 15 16 17 18 IN1- COMP1 SYNC AGND REF REFIN BST2 GDH2 GDL2 PGND PVCC GDL1 IN1- VOUT2 VIN VP1 IN1- VP1 VIN VIN VIN U1 SC2443 1 2 3 4 5 6 13 14 15 16 17 18 IN1- COMP1 SYNC AGND REF REFIN BST2 GDH2 GDL2 PGND PVCC GDL1 VOUT1 VIN IN1- VOUT1 Dual Independent Outputs Single Output With Current Sharing |
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