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SC412AEVB 数据表(PDF) 1 Page - Semtech Corporation |
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SC412AEVB 数据表(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  www.semtech.com 1 SC412A POWER MANAGEMENT Synchronous Buck Controller The SC412A is a versatile, constant on-time synchronous buck, pseudo fixed-frequency, PWM controller intended for notebook computers and other battery operated portable devices. The SC412A contains all the features needed to provide cost-effective control of switch-mode power outputs. The output voltage is programmable from 0.75 to 5.25 volts using external resistors. Switching frequency is internally preset to 325kHz. Additional features cycle- by-cycle current limit, voltage soft-start, under-voltage protection, programmable over-current protection, soft shutdown, automatic power save and non-overlapping gate drive. The SC412A also provides an enable input and a power good output. The constant on-time topology provides fast, dynamic response. The excellent transient response means that SC412A 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 will increase or decrease to counter the change in output voltage. After the transient event, the controller frequency returns to steady state operation. At light loads, the automatic power save mode reduces the switching frequency for improved efficiency. Description October 25, 2007 V BAT Range 3V to 25V Soft-Shutoff at Output Current Sense Using Low-Side R DS(ON) or Resistor Sensing with Adjustable Cycle-by-Cycle Current Limit Fixed-Frequency 325kHz Constant On-Time for Fast Dynamic Response and Reduced Output Capacitance Automatic Smart Power Save† Internal Soft-Start Over-Voltage/Under-Voltage Fault Protection Power Good Output 1μA Typical Shutdown Current Tiny 3x3mm, 16 Pin MLP, Lead-free Package Low External Part Count Industrial Temperature Range 1% Internal Reference 1A/3A Non-Overlapping Gate Drive with SmartDrive™ High Efficiency > 90% Fully WEEE and RoHS Compliant †Patent pending Notebook and Sub-Notebook Voltage Controllers Tablet PCs Embedded Applications Typical Application Circuit Applications Features RLIM C2 D1 COUT Q1 CIN L1 Q2 C1 VOUT VOUT PGOOD VCC VBAT EN VCC R1 LX 1 BST 2 VCC 3 DL 4 FB 9 VOUT 10 PGOOD 11 EN 12 U1 SC412A VCC FB R2 R3 |
类似零件编号 - SC412AEVB |
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类似说明 - SC412AEVB |
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