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FAN5182 Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor |
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FAN5182 Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor |
1 / 18 page ©2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com May 2005 FAN5182 Rev. 1.0.1 FAN5182 Adjustable Output 1, 2, or 3-Phase Synchronous Buck Controller Features ■ Selectable 1-, 2-, or 3-phase operation at up to 1MHz per phase ■ ±2% Worst-case differential sensing error over temperature ■ Externally adjustable 0.8V to 5V output from a 12V supply ■ Logic-level PWM outputs for interface to external high-power drivers ■ Active current balancing between all phases ■ Built-in power-good/crowbar functions ■ Programmable over current protection with adjustable latch- off delay Applications ■ Auxiliary supplies ■ DDR memory supplies ■ Point-of-load supplies Description The FAN5182 is a highly efficient multi-phase synchronous buck switching regulator controller optimized for converting a 12V main supply into a high-current low voltage supply for use in point-of-load (POL) applications. It uses a multi-loop PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for regulator size and efficiency. The phase relationship of the output signals can be programmed to provide 1, 2, or 3-phase operation, allowing for construction of up to three complementary interleaved buck switching stages. The FAN5182 also provides accurate and reliable over-current protection and adjustable current limiting. FAN5182 is specified over the commercial temperature range of 0°C to +85°C and is available in a 20-lead QSOP package. Block Diagram VCC 800 mV REFERENCE SOFT START DELAY UVLO SHUTDOWN & BIAS OSCILLATOR – + GND FAN5182 14 EN 6 DELAY 7 ILIMIT 10 PWRGD 5 1 RT 8 RAMPADJ 9 PWM2 19 3 FB PWM3 18 SW1 17 CSSUM 12 CSCOMP 13 SW2 16 SW3 15 CSREF 11 PWM1 FBRTN 2 COMP 4 950mV – + 1.05V – + 650mV + – FB FB EN CURRENT LIMIT CIRCUIT CROWBAR CURRENT LIMIT + – CMP + – CMP – + + – CMP CURRENT BALANCING CIRCUIT 1/ 2 / 3-PHASE DRIVER LOGIC EN SET RESET RESET RESET 20 |
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