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MC34727CFC Scheda tecnica(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC34727CFC Scheda tecnica(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 19 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor MC34727 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 34727 is a high efficiency, synchronous, buck regulator, utilizing a voltage mode control architecture with feed forward. It is capable of providing a 600mA load current for output voltages of 0.8V to 3.3V, from a single input voltage rail between 2.7V and 5.5V. In a buck converter, most of the losses at high output loads are due to conduction losses in the power train, but at light output loads, the conduction losses are reduced and most of the losses become switching losses. Using Freescale’s Z- mode architecture, the 34727, at light output loads, will smoothly transition into a lower switching frequency, thus improving its efficiency. FUNCTIONAL PIN DESCRIPTION SUPPLY VOLTAGE INPUT (VIN) 2.7V to 5.5V DC power input. Bypass with a 4.7 µF ceramic capacitor as close as possible to the VIN and GND pins. GROUND (GND) Ground. ENABLE (EN) Active high enable input. EN is over-voltage protected to 6.0V, independent of the supply voltage. Drive with a logic high signal (or connect to VIN) for normal operation. Drive with a logic low signal, or connect to GND will disable the 34727. FEEDBACK INPUT (FB) Feedback of the output voltage. SWITCHING NODE (SW) This terminal connects to the output inductor. The node internally connects the drain of both the high side MOSFET and the low side MOSFET. NO CONNECTION (NC) Internally not connected. Connect to GND externally. |
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