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| Maxim MAX15206低成本电源方案 | |||||
作者：Maxim 文章来源：Maxim 点击数： 更新时间：2008-6-24  |
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Low-Cost, Small, 4.5V to 28V Wide Operating Range, DC-DC Synchronous Buck Controller The MAX15026 synchronous step-down controller operates from a 4.5V to 28V input voltage range and generates an adjustable output voltage from 85% of the input voltage down to 0.6V while supporting loads up to 25A. The device allows monotonic startup into a prebiased bus without discharging the output and features adaptive internal digital soft-start. The MAX15026 offers the ability to adjust the switching frequency from 200kHz to 2MHz with an external resistor. The MAX15026’s adaptive synchronous rectification eliminates the need for an external freewheeling Schottky diode. The device also utilizes the external low-side MOSFET’s on-resistance as a current-sense element, eliminating the need for a current-sense resistor. This protects the DC-DC components from damage during output overloaded conditions or output shortcircuit faults without requiring a current-sense resistor. Hiccup-mode current limit reduces power dissipation during short-circuit conditions. The MAX15026 includes a power-good output and an enable input with precise turn-on/turn-off threshold, which can be used for input supply monitoring and for power sequencing. Additional protection features include sink-mode current limit and thermal shutdown. Sink-mode current limit prevents reverse inductor current from reaching dangerous levels when the device is sinking current from the output. The MAX15026 is available in a space-saving and thermally enhanced 3mm x 3mm, 14-pin TDFN-EP package. The MAX15026 operates over the -40°C to +85°C temperature range. MAX15206特性: 4.5V to 28V or 5V ±10% Input Supply Range 0.6V to (0.85 x VIN) Adjustable Output Adjustable 200kHz to 2MHz Switching Frequency Ability to Start into a Prebiased Load Lossless, Cycle-by-Cycle Valley Mode Current Limit with Adjustable, Temperature-Compensated Threshold Sink-Mode Current-Limit Protection Adaptive Internal Digital Soft-Start ±1% Accurate Voltage Reference Internal Boost Diode Adaptive Synchronous Rectification Eliminates External Freewheeling Schottky Diode Hiccup-Mode Short-Circuit Protection Thermal Shutdown Power-Good Output and Enable Input for Power Sequencing ±5% Accurate Enable Input Threshold MAX15206应用: Set-Top Boxes LCD TV Secondary Supplies Switches/Routers Power Modules DSP Power Supplies Points-of-Load Regulators  图1. MAX15206方框图  图2. MAX15206的4.5V- 28V单电源应用电路图 详情请见: http://datasheets.maxim-ic.com/en/ds/MAX15026.pdf |
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