XC9303 series high efficiency synchronous step-up/down DC/DC controller ICs, with high efficiency synchronous rectifier topology, and a built-in 0.9V ±2.0% internal voltage source, which can be freely set output voltage range of 2.0V to 6.0V using external components. The built-in 300kHz switching frequency can be used with smaller external components.
The XC9303 series from Torex is a highly efficient, synchronous PWM/PFM switchable step‑up and step‑down DC‑DC controller. It operates with basic external components such as transistors, inductors, diodes, and capacitors, and features a synchronous rectification topology for high efficiency across a wide load range.
The document provides electrical characteristics, pin assignments, typical application circuits, layout recommendations, and component selection guidance, enabling designers to implement the controller in portable devices, power supplies, and other applications requiring flexible output voltage regulation.
| Input Voltage Range | 2.0 V – 10.0 V |
|---|---|
| Output Voltage Range | 2.0 V – 6.0 V |
| Oscillation Frequency | 300 kHz |
| Maximum Duty Cycle | 78 % (typical) |
| Soft‑Start Time | 10 ms (internally fixed) |
| Package | MSOP‑8A |
| Reference Voltage (Vref) | 0.9 V |
| Stand‑by Current | 73 µA (max) |
The reference voltage (Vref) on the FB pin is fixed at 0.9 V.
The controller operates at a typical oscillation frequency of 300 kHz.
The standby current is specified as 73 µA maximum.