XCL303/XCL304 Series ETR28016-001 Inductor Built-in Negative Output Voltage micro DC/DC Converters Green Operation Compatible GENERAL DESCRIPTION The XCL303/XCL304 series are small coil-integrated negative voltage micro DC/DC converter IC. The oscillating frequency is a fast 2.5MHz and the small 2.5 x 2.0 x 1.0mm package contributes significantly to space saving in PCB area. Further, integrating the coil together with the DC/DC simplifies the circuit board layout and minimizes potential noise interference. Compared to a charge pump type solution, the switching method of the XCL303/XCL304 maintains a stable output voltage even when the input voltage fluctuates. In addition, this new micro DC/DC can support larger output current than a charge pump solution. The PWM controlled XCL303 series can be selected for applications where low noise is important, and the PWM/PFM automatic switching controlled XCL304 series can be selected for applications where high efficiency at light load current and low noise at high load current is important. The XCL303/XCL304 series allows users to select either a PWM control or PWM/PFM automatic switching control method, which are optimum for applications where low noise and high efficiency are important. Output voltage can be adjusted within the range of -1.2V to -6.0V using externally mounted resistors. FEATURES APPLICATIONS Input Voltage Range : 2.7V ~ 5.5V Negative power supply for Optical transceiver Output Voltage Range : -1.2V ~ -6.0V Negative power supply for AMP FB Voltage 0.5V 10mV Negative power supply for LCD V Voltage 1.6V 40mV REF Output Current : 300mA VOUT=-3.0V, VIN=3.3V(TYP.) Negative power supply for CCD Quiescent Current : 250A (TYP.) General purpose Negative power supply Control Methods : PWM Control (XCL303 Series) : PWM/PFM Control (XCL304 Series) Oscillation Frequency : 2.5MHz Protection Function : Current Limit (1.1A TYP.) Function : Soft Start Time External Adjustment UVLO Operating Ambient Temperature : -40 ~ +105 Packages : CL-2025-02 (2.5 x 2.0 x 1.0mm) Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS XCL303/304 (V = 3.7V, V = -3.3V) IN OUT CIN=10F(GRM188D71A106KA73),CL=10F(GRM188D71A106KA7) SD=PMEG2010BELD, R =150k, R =43k FB1 FB2 7 SD L1 1 L V 6 x IN R FB1 C IN 5 2 GND FB R FB2 C L 3 V 4 REF CE L2 C VREF 8 1/24 XCL303/XCL304 Series BLOCK DIAGRAM L1 L2 Inductor AV DD Phase Current Sense PV DD FB Compensation Current Limiter AV DD Error Amp PWM Comparator - V - REF PWM/PFM Buffer V V start up + REF IN Controller Logic Driver Controller + Each L X Circuit CE CE Controller Logic RAMP Wave Oscillator Generatar PV DD AVDD V IN UVLO GND * Diodes inside the circuit are an ESD protection diode and a parasitic diode. PRODUCT CLASSIFICATION Ordering information XCL303 - PWM Control XCL304 - PWM/PFM Automatic Switching Control DESIGNATOR ITEM SYMBOL DESCRIPTION Product Type A Refer to Selection Guide Feedback Voltage 05 Feedback Voltage is fixed at 0.5V Oscillation Frequency 2 2.5MHz (*1) - Packages (Order Unit) KR-G CL-2025-02 (3,000pcs/Reel) (*1) The -G suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. Selection Guide OUTPUT CHIP CURRENT SOFT TYPE UVLO VOLTAGE ENABLE LIMIT START A External set Yes Yes Yes Yes 2/24