XC9221C09AMR

• Product Introduction

XC9221C09AMR 16V input voltage step-down DC/DC controller

The XC9220/XC9221 series are multi-purpose, step-down DC/DC controller ICs. Configure the periphery of the chip with a switch, an inductor, a secondary tube and two capacitors to obtain an efficient, stable power supply with an output current of up to 3A. A low ESR capacitor, such as a ceramic capacitor, can be used as its output capacitor. The XC9220/XC9221 series has a 0.9V (±1.5%) reference voltage that can be freely set using an external voltage divider. Switching frequencies of 300kHz, 500kHz, and 1.0MHz are available with small peripheral devices. The XC9220 series is PWM controlled, and the XC9221 series is PWM/PFM controlled, which automatically switches from PWM to PFM when the load becomes lighter, thus maintaining high efficiency throughout the load range. Regarding the soft start time, the XC9220A/XC9221A and C series are internally set to 4 milliseconds, while the XC9220B/X9221B and D series can be set externally. With a built-in U.V.L.O. (Undervoltage Lockout) function, the external P-channel switch is forcibly shut off when the input voltage is as low as 2.3V or less. Two packages are available: SOT-25 and USP-6.

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