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SC415 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC415 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 30 page  POWER MANAGEMENT July 23, 2008 1 SC415 Dual Synchronous Buck Controller Features VIN Range 3-25V Outputs Adjustable from 0.75 to 5.25V, or Preset Output Voltages: VOUT1 = 1.8 or 1.5V VOUT2 = 1.25 or 1.05V Low Shutdown Power Constant On-Time for Fast Dynamic Response Adjustable Switching Frequency Separated Frequencies for Minimal Switching Interaction: VOUT1 = up to 600kHz VOUT2 = up to 720kHz Power Save or Continuous Operation at Light Load Adjustable Soft-start Rates for Each Output Soft-Shutdown for Each Output Over-Voltage and Under-Voltage Fault Protection Cycle-by-Cycle Valley Current Limit DC Current Sense Using Low-Side RDSON Sensing, or RSENSE in Source of Low-Side MOSFET for Greater Accuracy Separate Power Good Outputs Separate Enable/Power Save Inputs 3.1A Non-Overlapping Gate Drive SmartDriveTM for High-Side MOSFET MLP 4x4 24 Pin Package Industrial Temperature Range Applications Notebook and Sub-Notebook Graphics Voltage Controllers Tablet PCs Embedded Applications • • • • Description The SC415 is a versatile, constant on-time, pseudo fixed- frequency, dual synchronous buck PWM controller intended for notebook computers and other battery operated portable devices. The SC415 contains all the features needed to provide cost-effective control of two independent switchmode power supplies. The two DC outputs are adjustable from 0.75V to 5.25V. Additional features for each output include cycle-by- cycle current limit, voltage soft-start, under-voltage and over-voltage protection, programmable over-current protection, soft shutdown, selectable power save and non-overlapping gate drive. The SC415 provides two enable/power save inputs, two soft-start inputs, two power good outputs and an on-time adjust input. The constant on-time topology provides fast dynamic response. The excellent transient response means that SC415 based solutions require less output capacitance than competing fixed-frequency converters. Switching frequency is constant until a step in load or line voltage occurs, at which time the pulse density and frequency moves to counter the change in output voltage. After the transient event, the controller frequency returns to steady state operation. At light loads with power save enabled, the SC415 reduces switching frequency for improved efficiency. © 2008 Semtech Corporation |
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