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MCP1601 Datasheet(PDF) 12 Page - Microchip Technology |
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MCP1601 Datasheet(HTML) 12 Page - Microchip Technology |
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12 / 24 page  MCP1601 DS21762B-page 12 2003-2013 Microchip Technology Inc. 5.0 APPLICATIONS INFORMATION FIGURE 5-1: Typical Application Circuit. 5.1 Setting Output Voltage The MCP1601 output voltage is set by using two exter- nal resistors for output voltages 1.2V. For output volt- ages < 1.2V, a third 1 M series resistor is necessary to compensate the control system. A 200 k resistor is recommended for R2, the lower end of the voltage divider. Using higher value resistors will make the cir- cuit more susceptible to noise on the FB pin, causing unstable operation. Lower value resistors can be used down to 20 k or below, if necessary. The feedback reference voltage for the MCP1601 is typically 0.8V. The equation used to calculate the output voltage is shown below. EQUATION Example: Desired VOUT = 2.5V VFB = 0.8V R2 = 200 k R1 = 425 k 5.1.1 LEAD CAPACITOR Capacitor C1 is used for applications that utilize ceramic output capacitors. To lower the PFM mode rip- ple voltage, a 47 pf capacitor for C1 is used to couple the output AC ripple voltage to the internal PFM mode comparator. For PWM mode, only applications that use electrolytic capacitors that have 0.2 or greater of ESR (Equivalent Series Resistance), C1 is not necessary. 5.2 Choosing External Components 5.2.1 CAPACITORS The MCP1601 was developed to take full advantage of the latest ceramic capacitor technology, though electro- lytic types can be used as well. When selecting the best capacitor for the application, the capacitance, physical size, ESR, temperature coefficient, ripple current rat- ings (electrolytic) and cost are considered in making the best choice. When selecting ceramic capacitors for COUT, the tem- perature coefficient of the dielectric should be evalu- ated. Two dielectrics are recommended as they are stable over a wide temperature range (X5R and X7R). Other dielectrics can be used, but their capacitance should stay within the recommended range over the entire operating temperature range. 1M For VOUT < 1.2V ONLY VOUT PGND LX SHDN VIN 1 2 3 4 8 7 6 5 MCP1601 FB SYNC/ AGND Input Voltage 2.7V-4.2V CIN 10 µF 10 µH COUT 10 µF R1 250 k (for 1.8V) R2 200 k MCP1601 Application Circuit IOUT = 0 mA to 400 mA COUT Range 10 µF to 47 µF L Range 10 µH to 22 µH C1 47 pF VOUT Range 1.2V to 3.3V PWM R 1 R 2 V OUT V FB 1 – = Where: VOUT is the desired output voltage, VFB is the MCP1601 internal feedback reference voltage R1 is the resistor connected to VOUT in the voltage divider R2 is the resistor connected to ground in the voltage divider |
Similar Part No. - MCP1601_13 |
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Similar Description - MCP1601_13 |
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