COT Control, 1.5A Synchronous Step-Down DC/DC Converters New Product Leaflet XC9260/XC9261 Series Smart Phone Portable Gaming Digital Camera The XC9260/XC9261 series is a group of synchronous step-down DC/DC converters with a built-in P-channel MOS driver transistor and N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. HiSAT-COT control provides excellent load transient response. The XC9260 series is PWM control and the XC9261 series is automatic PWM/PFM switching control which provides fast response, low ripple and high efficiency over the full range of loads. USP-6C SALES (1.8x2.0x0.6mm) Load-transient response characteristics 1 The output voltage drop is one half that of previous products, and the response speed is eight times faster. XC9260/XC9261 Previous product VIN=5V, VOUT=1.8V, L=2.2μH, CIN=10μF, CL=20μF VIN=5V, VOUT=1.8V, L=1μH, CIN=10μF, CL=20μF 1A 1A 1mA 1mA 120μs 15μs VOUT=50mV/div VOUT=50mV/div 60mV 30mV 50μsec/div 50μsec/div SALES Less frequency fluctuation 2 The frequency fluctuation due to the Vin and load is less than the usual COT control ICs. COT control ICs XC9261ｘ18D(PFM) 4.5 VIN=4.2V VIN=5.0V 4.0 Oscillation Freqency: fOSC (MHz) Oscillation Freqency: fOSC (MHz) 4.5 3.5 3.0 2.5 2.0 1.5 1.0 0.5 VIN=4.2V VIN=5.0V 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0 200 400 600 800 1000 1200 0 200 Output Current: IOUT (mA) 400 600 800 1000 1200 Output Current: IOUT (mA) Features Input Voltage Range 2.7V∼5.5V Functions Soft-Start, UVLO, CLHigh Speed Discharge(Type B) Output Voltage Range 0.8V∼3.6V Protection Circuits Current Limit, Thermal Shutdown Supply Current 15μA(fOSC=1.2MHz), 25μA(fOSC=3.0MHz) Short Circuit Protection (Type B) Operating Ambient Temperature -40℃∼105℃ Output Current 1.5A Efficiency 90% Packages SOT-89-5 Oscillation Frequency 1.2MHz, 3.0MHz USP-6C www.torex.co.jp/english July 2014 ● Values shown in this sheet can be changed without any prior notice. New Product Leaflet COT Control, 1.5A Synchronous Step-Down DC/DC Converters XC9260/XC9261 Series SALES 3 HISAT-COT control waveform HiSAT-COT High Speed circuit Architecture for Transient with Constant On Time High speed transient response is possible COT=PFM Mode The HiSAT-COT ON time is determined by the VIN and VOUT conditions. A high speed response to output voltage drops is possible because the necessary energy is supplied in the optimum ON time without delay. [When the load current is changed (fixed VIN)] IOUT t Coil Current t Lx t In non-continuous mode, the ON time is fixed and the frequency varies. In continuous mode, fluctuations in the switching frequency are reduced because the DUTY approximates VOUT/VIN and the ON time is fixed. [When VIN is changed (fixed load)] VIN t Lx t The ON time changes according to VOUT/VIN/fosc_set, and thus fluctuations in the switching frequency are reduced. The XC9260 also operates in continuous mode when the load is light, and thus there is minimal fluctuation USP-10B across the full range of loads and input. www.torex.co.jp/english July 2014 ● Values shown in this sheet can be changed without any prior notice.