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SMB214C データシート(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB214C データシート(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 27 page SMB214A/B/C Preliminary Information Summit Microelectronics, Inc. 2128 2.2 9/17/2010 2 The SMB214A/B/C are fully programmable DC-DC controllers that incorporate power delivery and advanced power monitoring and control functionality. The devices integrate three synchronous “buck” step- down controllers in a space saving 5x5 QFN-32 package. The SMB214A uses a fixed 400kHz whereas the SMB214B uses a fixed 800kHz, and the SMB214C a fixed 1MHz Pulse Width Modulation (PWM) control circuit. A type-three voltage mode compensation network is used offering a cost effective solution without compromising transient response performance. By utilizing external N- and P–type MOSFET transistors the efficiency and load current level can be customized to fit a wide array of system requirements. The SMB214A/B/C contain three buck outputs capable of producing an output voltage less than the input voltage. Each buck output voltage is set by an internal resistor divider and a programmable voltage reference. The integrated resistor divider eliminates the cost and space necessary for external components and has several programmable values. Through the programmability of the reference and the resistor divider, practically any output voltage smaller than the battery can be produced without the need to change external components. The SMB214A/B/C are capable of power-on/off cascade sequencing where each channel can be assigned one of three unique sequence positions. During sequencing each channel in a given sequencing position is guaranteed to reach its programmed output voltage before the channel(s) occupying the next sequence position initiate their respective soft-start sequence. A unique programmable delay exists between each power on/off sequence position. In addition to power on/off sequencing all supplies can be powered on/off individually through an I 2C command or by assertion of the enable pin. Each output voltage is monitored for under-voltage and over-voltage (UV/OV) conditions, using a comparator- based circuit where the output voltage is compared against an internal programmable reference. An additional feature of the output voltage monitoring is a programmable glitch filter capable of digitally filtering a transient OV/UV fault condition from a true system error. When a fault is detected for a period in excess of the glitch filter, all supplies may be sequenced down or immediately disabled and an output status pin can be asserted. The current system status is always accessible via internal registers containing the status of all three channels. The SMB214A/B/C also possess an Under-voltage Lockout (UVLO) circuit to ensure the devices will not power up until the input voltage has reached a safe operating voltage. The UVLO function exhibits hysteresis, ensuring that noise or a brown out voltage on the supply rail does not inadvertently lead to a system failure. The SMB214A/B/C provide dynamic voltage management over all of their output voltages. Through an I 2C command, all output voltage levels can be increased or decreased to a pre-programmed level. In addition, each output is slew rate limited by soft-start circuitry that requires no external capacitors. All programmable settings on the SMB214A/B/C are stored in non-volatile registers and are easily accessed and modified over an industry standard I 2C serial bus. For fastest prototype development times Summit offers an evaluation card and a Graphical User Interface (GUI). GENERAL DESCRIPTION |
同様の部品番号 - SMB214C |
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同様の説明 - SMB214C |
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