PART OBSOLETE CONTACT US AZ34063A 1.5A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Description Pin Assignments The AZ34063A is a monolithic switching regulator control circuit which contains the primary functions required for DC-DC converters. This (Top View) device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. The AZ34063A is specifically designed as a general DC-DC converter to be used in Step-Down, Step-Up and Voltage-Inverting applications with a minimum number of external components. The AZ34063A is available in 2 packages: SOIC-8 and DIP-8. SOIC-8 (Top View) Features Operation from 3.0V to 36V Input Low Standby Current Current Limiting Output Switch Current to 1.5A Output Voltage Adjustable Operation Frequency up to 180kHz Precision 2% Reference For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP DIP-8 capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. Applications AZ34063A Typical Applications Circuit Step-up converter L1 150H R3 180 8 1 B S Q A R 7 2 Ipk I PK D1 Rsc C 1N5819 T 0.22 OSC V 12V IN 6 3 + C T C1 470pF 1.25V 100 F + Reference Regulator - 5 4 L2 1.0 U1 AZ34063A V OUT V OUT 28V/175mA R1 47k + + R2 C2 C3 Optional 2.2k 330 F 100 F Filter Note 1: This is a typical step-up 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 swithching 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 1.25V. Then the output of the comparator will go high, the output switch will be allowed to conduct. Since V =V * R2/(R1+R2)=1.25(V), the output voltage can be decided by V =1.25 * PIN5 OUT OUT (R1+R2)/R2 (V). 2 of 14 July 2021 AZ34063A Diodes Incorporated www.diodes.com Document number: DS43791 Rev. 1 - 4 OBSOLETE PART DISCONTINUED