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SMB113A bảng dữ liệu(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB113A bảng dữ liệu(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 32 page SMB113A/B/SMB117/A Preliminary Information Summit Microelectronics, Inc. 2111 2.4 6/24/2008 2 The SMB113A/B and SMB117/A are fully programmable DC-DC controllers that incorporate power delivery and advanced power monitoring and control functionality. The devices integrate four synchronous “buck” step- down controllers in a space saving package. The SMB113A uses a fixed 800kHz whereas the SMB113B uses a fixed 1MHz, the SMB117 a fixed 400kHz and the SMB117A a fixed 250kHz 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 SMB113A/B and SMB117/A contain four 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 SMB113A/B and SMB117/A are capable of power- on/off cascade sequencing where each channel can be assigned one of four 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 four channels. The SMB113A/B and SMB117/A 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 SMB113A/B and SMB117/A 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 is user-programmable and requires no external capacitors. All programmable settings on the SMB113A/B and the SMB117/A 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 |
Số phần tương tự - SMB113A |
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Mô tả tương tự - SMB113A |
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