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MAX629 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX629 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page 28V, Low-Power, High-Voltage, Boost or Inverting DC-DC Converter 6 _______________________________________________________________________________________ without a significant loss of accuracy. Begin by select- ing R2 to be in the 10k Ω to 200kΩ range, and calculate R1 using the applicable equation from the following subsections. Positive Output Voltages For positive output voltages, use the typical boost con- figuration shown in Figure 2, connecting POL to GND. This sets the threshold voltage at FB to equal VREF. Choose the value of R2 and calculate R1 as follows: where VREF = 1.25V. Negative Output Voltages For negative output voltages, configure R1 and R2 as shown in Figure 3, connecting POL to VCC. This sets the FB threshold voltage to GND so that negative volt- ages can be regulated. Choose R2 and calculate R1 as follows: where VREF = 1.25V. Figure 3 demonstrates generation of a negative output voltage by following the MAX629 with an inverting charge pump. This configuration limits VOUT to values between - VIN and -28V. If smaller negative output volt- ages are required, D2’s cathode can be connected to VIN. This alternative configuration permits output volt- ages smaller than - VIN, but cannot be used for output voltages more negative than - 28V - VIN. It produces roughly one-half the output current as the standard con- figuration and is typically 5% less efficient. R1 = R2 x V V | | OUT REF R1 = R2 x V V OUT REF − 1 MAX629 MIN OFF-TIME GENERATOR TRIG Q S LX ISET Q F/F GND R START-UP MAX ON-TIME GENERATOR (10 µs) CONTROL FB REF VCC 1V START-UP COMPARATOR ERROR AMP 1.25V REF POL TRIG Q SHDN POLARITY Figure 1. Functional Diagram |
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