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SMB208A датащи(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB208A датащи(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 27 page SMB206A/7A/8A Preliminary SUMMIT Microelectronics, Inc. 2147 2.4 2/23/2012 2 DIGITAL INTERFACE/NON-VOLATILE PROGRAMMING The built-in serial digital I 2C/SMBus compatible port and built-in non-volatile programming bring several benefits to power supply design with the SMB206A/7A/8A. Many external components are eliminated that would otherwise be used to set configuration and parametric values. Additionally, the digital interface allows for quick and easy development and debug without hardware changes. Finally, after the non-volatile power-up configuration, the serial port can be used to re-program the SMB206A/7A/8A by host software after the system is running. For quick programming development and debug use Summit’s prebuilt evaluation kit including a PC- based graphical user interface (GUI). DUAL PWM DC-DC REGULATORS The SMB206A/7A/8A contains two integrated PWM DC- DC step-down (buck) regulator(s) with identical features and functions. The input voltage range is +4.5V to +16V to support a wide variety of system applications. The outputs support a full 1A-3A continuous output current with a built-in cycle-by-cycle current limit. The output voltage range is +0.8V and +5.0V and fully programmable in non-volatile (static) or volatile (dynamic, on-the-fly) via the serial digital interface. The nominal “coarse” (100mV steps) voltage programming provides flexibility for various types of loads without hardware changes. In the SMB206A/7A/8A the “fine” programming provides “margining” capability for sophisticated system validation and optimization. Built-in high-side MOSFETs work in conjunction with external Schottky diode rectifiers in constant frequency PWM-mode at high load currents or high efficiency pulse skipping PFM-mode at light loads. Switching frequency is programmable (500kHz/1000kHz) to trade off efficiency and component size. Each output switches 180 o out of phase with the other to reduce input ripple current, switching noise and input capacitance requirement. Bootstrapped high-side drive improves efficiency and extends the operating voltage range. Frequency compensation is fully integrated to further reduce component count and cost. POWER CONTROL/MANAGEMENT FUNCTIONS The SMB206A/7A/8A integrates several power management functions that are typically otherwise performed by external circuits. These include output sequencing with programmable timing, hardware or software-based output enable/disable, and programmable softstart timing. Also, the output voltages are monitored with a programmable PGOOD/RESET output (PGOOD asserts immediately, RESET delays 125ms). Software Enable bits and hardware Enable pins work together to provide flexible power up/down and manual/auto sequencing. The SMB206A/7A/8A also supports digitally programmable dynamic output voltage. The non-volatile setting determines the power-up/static value but it can be re-programmed by software via the serial interface. The settings are +0.8V to +5.0V and can support dynamic voltage/clock CPU cores or low power memory modes. GENERAL DESCRIPTION |
Аналогичный номер детали - SMB208A |
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Аналогичное описание - SMB208A |
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