The XC9509 series of synchronous step-down DC/DC converters have a built-in LDO regulator in parallel with the DC/DC converter's output, and also have a voltage detector.
The XC9509 series from Torex combines a synchronous step‑down DC/DC converter, a high‑speed LDO regulator, and an integrated voltage detector. The device operates from 2.4 V to 6.0 V input and provides output voltages from 0.9 V to 4.0 V with up to 600 mA current (MSOP‑10) or 400 mA (USP‑10). Three internal switching frequencies (300 kHz, 600 kHz, 1.2 MHz) are selectable, and efficiency exceeds 90 %.
The converter includes a P‑channel driver, a synchronous N‑channel switch, UVLO protection at 1.4 V, a 5 ms soft‑start, and a high‑speed LDO regulator with 80 mV dropout at 100 mA. Pin functions, marking rules, and typical application circuits are detailed for easy PCB integration.
| Input Voltage Range | 2.4 V – 6.0 V |
|---|---|
| Output Voltage Range (DC/DC & LDO) | 0.9 V – 4.0 V |
| Maximum Output Current (MSOP‑10) | 600 mA |
| Maximum Output Current (USP‑10) | 400 mA |
| Switching Frequency Options | 300 kHz, 600 kHz, 1.2 MHz |
| Efficiency | > 90 % |
| Soft‑Start Time | 5 ms |
| LDO Dropout Voltage | 80 mV @ 100 mA (Vout = 2.8 V) |
The device operates from 2.4 V to 6.0 V input.
It can deliver up to 600 mA of output current.
Three frequencies are available: 300 kHz, 600 kHz, and 1.2 MHz.