MAX5035 1A, 76V, High-Efficiency MAXPowerStep-Down DC-DC ConverterPin DescriptionPINNAMEFUNCTION 1 BST Boost Capacitor Connection. Connect a 0.1µF ceramic capacitor from BST to LX. 2 VD Internal Regulator Output. Bypass VD to GND with a 0.1µF ceramic capacitor. 3 SGND Internal Connection. SGND must be connected to GND. Output Sense Feedback Connection. For fixed output voltage (MAX5035A, MAX5035B, MAX5035C), 4 FB connect FB to VOUT. For adjustable output voltage (MAX5035D, MAX5035E), use an external resistive voltage-divider to set VOUT. VFB regulating set point is 1.22V. 5 ON/OFF Shutdown Control Input. Pull ON/OFF low to put the device in shutdown mode. Drive ON/OFF high for normal operation. 6 GND Ground 7 VIN Input Voltage. Bypass VIN to GND with a low ESR capacitor as close to the device as possible. 8 LX Source Connection of Internal High-Side Switch Block Diagram ON/OFF VIN ENABLE REGULATOR CPFM I (FOR ANALOG) REF-PFM 1.69V HIGH-SIDE CURRENT REGULATOR CILIM SENSE VD (FOR DRIVER) VREF OSC RAMP IREF-LIM BST MAX5035 CLK FB CONTROL RAMP LOGIC Rh TYPE 3 x1 COMPENSATION THERMAL CPWM R V SHUTDOWN l REF EAMP GND LX SGND Maxim Integrated 9
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