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ME3220 Datasheet(PDF) 11 Page - Microchip Technology |
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ME3220 Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 38 page  © 2011 Microchip Technology Inc. DS25004A-page 11 MCP16301 4.0 DETAILED DESCRIPTION 4.1 Device Overview The MCP16301 is a high input voltage step-down regulator, capable of supplying 600 mA to a regulated output voltage from 2.0V to 15V. Internally, the trimmed 500 kHz oscillator provides a fixed frequency, while the Peak Current Mode Control architecture varies the duty cycle for output voltage regulation. An internal floating driver is used to turn the high side integrated N-Channel MOSFET on and off. The power for this driver is derived from an external boost capacitor whose energy is supplied from a fixed voltage ranging between 3.0V and 5.5V, typically the input or output voltage of the converter. For applications with an output voltage outside of this range, 12V for example, the boost capacitor bias can be derived from the output using a simple Zener diode regulator. 4.1.1 INTERNAL REFERENCE VOLTAGE VREF An integrated precise 0.8V reference combined with an external resistor divider sets the desired converter out- put voltage. The resistor divider range can vary without affecting the control system gain. High-value resistors consume less current, but are more susceptible to noise. 4.1.2 INTERNAL COMPENSATION All control system components necessary for stable operation over the entire device operating range are integrated, including the error amplifier and inductor current slope compensation. To add the proper amount of slope compensation, the inductor value changes along with the output voltage (see Table 5-1). 4.1.3 EXTERNAL COMPONENTS External components consist of: • input capacitor • output filter (Inductor and Capacitor) • freewheeling diode • boost capacitor • boost blocking diode • resistor divider. The selection of the external inductor, output capacitor, input capacitor and freewheeling diode is dependent upon the output voltage and the maximum output current. 4.1.4 ENABLE INPUT Enable input, (EN), is used to enable and disable the device. If disabled, the MCP16301 device consumes a minimal current from the input. Once enabled, the internal soft start controls the output voltage rate of rise, preventing high-inrush current and output voltage overshoot. 4.1.5 SOFT START The internal reference voltage rate of rise is controlled during startup, minimizing the output voltage overshoot and the inrush current. 4.1.6 UNDER VOLTAGE LOCKOUT An integrated Under Voltage Lockout (UVLO) prevents the converter from starting until the input voltage is high enough for normal operation. The converter will typi- cally start at 3.5V and operate down to 3.0V. Hysteresis is added to prevent starting and stopping during startup, as a result of loading the input voltage source. 4.1.7 OVERTEMPERATURE PROTECTION Overtemperature protection limits the silicon die temperature to 150°C by turning the converter off. The normal switching resumes at 120°C. |
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