The XC9244/XC9245 series is a group of synchronous-rectification type step-down DC/DC converters with a built-in 0.65Ω P-channel MOS driver transistor and 0.45Ω N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Output current of 400mA (MAX.) to be configured using only a coil and capacitor connected externally. The output voltage can be set from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). With an internal switching frequency of 1.2MHz, small external components can be used.
The XC9244/XC9245 series are synchronous‑rectification step‑down converters designed for mobile phones, Bluetooth headsets, portable game consoles, digital cameras, and notebook computers. They feature a built‑in P‑channel MOS driver (0.65 Ω) and N‑channel MOS switch (0.45 Ω), allowing the use of low‑ESR ceramic capacitors and providing high efficiency up to 90 %.
Key electrical specifications include an input voltage range of 2.3‑6.0 V, selectable output voltage from 0.8‑4.0 V in 0.05 V steps, maximum output current of 400 mA, and a fixed 1.2 MHz switching frequency. The device is supplied in a compact USPN‑6 package and incorporates features such as UVLO, soft‑start (0.25 ms), and a high‑speed CL discharge circuit.
| Input Voltage Range | 2.3 V – 6.0 V |
|---|---|
| Output Voltage Range | 0.8 V – 4.0 V (0.05 V steps) |
| Typical Efficiency | 90 % |
| Switching Frequency | 1.2 MHz ±15% |
| Package | USPN‑6 |
They operate with an input voltage between 2.3 V and 6.0 V.
The devices are supplied in a USPN‑6 surface‑mount package.
Typical efficiency is about 90 %.