Products - Step-Down

XC9221 16V Step-Down DC/DC Controller

16V Step-Down DC/DC Controller image


Property XC9221
Output Current 3A
Input Voltage 2.8 ~ 16V
Output Voltage ADJ=0.9V
Oscillation Frequency 300kHz, 500kHz, 1MHz
Quiescent Current 25µA
Packages SOT-25, USP-6C

Product Description

16V Step-Down DC/DC Controller

  • XC9220 PWM only
  • XC9221 PWM/PFM (auto-switching)

The XC9220/9221 series are multi-purpose step-down DC/DC controller IC able to handle input voltages up to 16V. Highly efficient, stable power supplies, with output currents up to 3A can be realized using only a transistor, coil, diode, and two ceramic capacitors connected externally.

The XC9220/9221 series has a 0.9V (±1.5%) reference voltage, and using externally connected resistors, the output voltage can be set freely. With an internal switching frequency of 300kHz and 500kHz (1MHz as custom), small external components can also be used.

As for the soft-start time, the XC9220/9221A series is internally set to 4msec and the XC9220/9221B series can be externally set-up. With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.3V or lower.


Input Voltage: 2.8V ~ 16.0V
Output Voltage: 0.9V +/-1.5%
Output Current: ~ 3A
Switch Frequency: 300kHz, 500kHz & 1.0MHz
Compatible with Low ESR/Ceramic Capacitors
Programmable soft start
Stand-by Current: 0.1uA (typ)


XC9221 Typical Application Circuit

XC9221 Ripple Voltage vs Output Current