XC9235 Series

3MHz Synchronous Step-Down DC/DC Converter

XC9235 PWM only
XC9236 PWM/PFM (Auto Switching)
XC9237 PWM only or PWM/PFM (Auto Switching)

The XC9235/9236/9237 series, is a group of synchronous DC/DC converters with a built-in 0.42 ohm P-channel driver transistor and 0.52 ohm N-channel switching transistor. The series benefits from the use of ceramic capacitors. The ICs provide a high efficiency (Typ 92%) and a stable power supply with output currents of up to 600mA achievable using only a coil and two capacitors connected externally. Quiescent current is only 15μA.

Minimum operating voltage is 2.0V. Output voltage is internally programmable in a range from 0.8V to 4.0V in increments of 50mV (accuracy: ± 2.0%). The built-in oscillator, is selectable at either 1.2MHz or 3MHz. The XC9235 is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually be switched between the PWM and PWM/PFM switching control mode,allowing fast response, low ripple (<10mV) and high efficiency over the full range of load conditions. The soft start and current control functions are internally optimized. During standby, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.

Features:

Input Voltage: 2.0V ~ 6.0V
Output Voltage: 0.8V ~ 4.0V
Output Current: 600mA
Oscillator Frequency: 1.2MHz, 3MHz 
Compatible with ceramic capacitors
Built-in soft start circuit
Built-in current limiter circuit 
Stand-by Current: 1.0μA (max)
Small SOT23-5 USP-6C (2.0 x 1.8 x 0.6mm)
Only 3 External Components required
 

Packages: SOT-25 , USP-6C