TOREX XC9120B091ER-G

XC9120/9121/9122 Series are PWM, PWM/PFM auto/external switching controlled step-up DC/DC converter controller ICs. Since maximum duty ratio is as large as 93%, the series is the best for the applications used as high step-up ratios, such as the LCD panels and OLED. In this series, even if it is a high step-up ratio, the output voltage stabilized at high efficiency can be obtained. With 0.9V (±2.0%) of reference voltage supply internal, and using external resistors, RFB1 and 2, output voltage can be set up freely within a range of 1.5V to 30V. For a current sense, with the use of RSENSE, ceramic capacitors can be used as load capacitors and allows for lower output ripple and reduced PCB area requirements. Control automatically switches from PWM to PFM during light loads with the XC9121 series and the XC9122 series can switch the control from PWM to PFM using external signals depending on the circuit conditions. During stand-by (when the CE pin is low), all circuits are shutdown to reduce current consumption to as low as 1.0 μA or less. The overcurrent limit circuit of this IC is designed to monitor the ripple voltage of the FB pin and operates the IC to stop when the ripple voltage runs over 250 mV. The IC resumes its operation with a toggle of the CE pin or by turning the power supply back on.

• Input Voltage Range: 0.9V ~ 6.0V
• Operating Voltage Range: 1.8V ~ 6.0V
• Output Voltage Range: 1.5V ~ 30V (externally set)
• Reference voltage 0.9V (±2.0%)
• Oscillation Frequency: 100kHz (±15%)
• Output Current: ≥80mA (VIN = 3.6V, VOUT = 15V)
• Control: XC9120 (PWM); XC9121 (PWM/PFM Automatic); XC9122 (PWM/PFM Externally)
• High Efficiency: 85% (TYP.) (VIN = 3.6V, VOUT = 15V, IOUT = 10mA)
• Stand-by Function: ISTB = 1.0 μA (MAX.)
• Load Capacitors: Low ESR capacitor compatible
• Current Limiter: Operates when ripple is 250 mV
• Maximum Duty Cycle: 93% (TYP.) for High Step-up Ratio
• Packages: SOT-25, USP-6C

• Power Supply for the LCDs
• Organic electroluminescence display (OELD)