SP34063A Datasheet, PDF (6/9 Pages) Sipex Corporation – 1.5A Buck/Boost/Inverting DC-DC Switching Regulator

SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
Fig. 10: Current Limit Sense Voltage vs. Temperature
APPLICATION INFORMATION
TYPICAL BOOST CONVERTER CIRCUIT
This is a typical boost converter configuration. In the steady state, if the resistor divider voltage at
pin 5 is greater than the voltage in the non-inverting input, which is 1.25V determined by the
internal reference, the output of the comparator will go low. At the next switching period, the
output switch will not conduct and the output voltage will eventually drop below its nominal voltage
until the divider voltage at pin 5 is lower than 1.25. Then the output of the comparator will go high,
the output switch will be allowed to conduct. Since V_PIN5 = V_OUT*R2/(R1+R2) = 1.25(V), The output
voltage can be decided by V_OUT = 1.25V*(R1+R2)/R2(V).
© 2011 Exar Corporation
6/9
Rev. 2.1.0