XC9120/9121/9122 Series are PWM, PWM/PFM auto/external switching controlled step-up DC/DC converter controller ICs. With a maximum duty ratio of 93%, they are suitable for applications with high step-up ratios, such as LCD panels and OLED. Even with high step-up ratios, this series can achieve stable output voltage with high efficiency. The internal reference voltage supply is 0.9V (±2.0%), and the output voltage can be freely set within a range of 1.5V to 30V using external resistors RFB1 and RFB2.
The XC9120/XC9121/XC9122 series are step‑up DC/DC controller ICs designed for high step‑up ratios such as LCD panels and OLEDs. They feature a 0.9 V reference, PWM/PFM control, and a maximum duty cycle of 93 %.
The document provides electrical characteristics, pin configurations, typical application circuits, and packaging information for the SOT‑25 and USP‑6C packages, along with operational explanations and marking rules.
| Input Voltage Range | 0.9 V ~ 6.0 V |
|---|---|
| Operating Voltage Range | 1.8 V ~ 6.0 V |
| Output Voltage Range | 1.5 V ~ 30 V (externally set) |
| Reference Voltage | 0.9 V ± 2.0 % |
| Oscillation Frequency | 100 kHz ± 15 % |
| Maximum Duty Cycle | 93 % (typical) |
| Stand‑by Current | 1.0 µA max |
| Efficiency | 85 % (typical at 3.6 V in, 15 V out, 10 mA) |
The typical maximum duty cycle is 93 %.
The standby current is up to 1.0 µA.
They use a 0.9 V reference with ±2.0 % tolerance.
Typical efficiency is about 85 %.