PWM, PWM/PFM Switching Step-Up & Down DC/DC Converters
The XC9302 series are step-up/down DC/DC converter controller ICs with fast, low ON resistance drivers built-in. A versatile, large output current, step-up/down DC/DC converter can be realized using only 4 basic external components - transistors, coils, diodes and capacitors.
Output voltage is selectable in 0.1V steps within a 2.4V ~ 6.0V (±2.5%) range and switching frequency is set at 180kHz or 300kHz.
The XC9302 series switches from PWM to PFM control during light loads and the series offers high efficiencies from light loads through to large output currents.
Soft-start time is internally set to 10 ms which offers protection against rush currents when the power is switched on and also against voltage overshoot.
During shutdown (CE pin = L), consumption current can be reduced to as little as 0.5μA or less.
Typical Application Circuit
|Input Voltage Range||2.0V~10V|
|Output Voltage Range||2.4V~6.0V(±2.5%),(0.1V increments)|
|Output Current||More than 50mA(VIN=2.4V,VOUT=3.3V)|
|High Efficiency||81%(TYP.)@5.0V, 78%(TYP.)@3.3V|
|Maximum Duty Cycle||85%(TYP.)|
|Functions||Output voltage internally set up|
|Package||SOT-25||Number of Pins||5|
|Pcs/Reel||3,000||Package Size(mm)||2.8 x 2.9 x 1.3|
What is the soft-start function?
The function to soften the rise to prevent the inrush current.
What is the standby current?
The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.
What does the FB product mean?
An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2