16V Step-down DC/DC Converter Includes Output Voltage from 1.2V to 5.6V
Torex Semiconductor has developed a new 16V Step-down DC/DC converter with an internal driver Tr., the XC9246/XC9247 series.
The XC9246/XC9247 series are 16V step-down DC/DC converters with an internal driver Tr. The output voltage can be set within the range 1.2V to 5.6V using the 1.0V (±1.5%) internal reference voltage and external resistors. The soft-start time is set internally to 1.5ms (TYP.) and this can be adjusted externally using a resistor and capacitor connected to the EN/SS pin.
The switching frequency is a high 1.2MHz, enabling the use of small external components. The bootstrap method is employed and the Hi side driver is N-ch to reduce chip area, making it possible to house the IC in a SOT-26W or small USP-6C package. Small peripheral components and a compact package also mean less mounting area is needed, contributing to improved efficiency/thermal performance. It can replace a 3-pin regulator.
PWM control (XC9246) or PWM/PFM auto switching control (XC9247) can be selected for the operation mode. The XC9246 series is PWM control, and the XC9247 series is PWM/PFM, which automatically switches from PWM to PFM during light loads and provides high efficiency, high load response, low voltage ripple, can be achieved over a wide range of load conditions.
Internal protective circuits include a current limiting circuit, thermal shutdown, and short-circuit protection circuit. An internal UVLO function that forcibly turns the driver Tr. off at the detection voltage level or lower is also provided. This series is an environment-friendly product that complies with the EU RoHS Directive and is Pb-free.
XC9246/XC9247 Series Features
? PFM control achieves high efficiency at light loads
? A small coil and ceramic capacitors can be used
? Can replace a 3-pin regulator
? Internal current limiting circuit, thermal shutdown, and short-circuit protection circuit
? Internal UVLO function (forcibly turns off driver Tr. at the detection voltage level or lower)
October 15, 2012