Inductor Built-in Negative Output Voltage “micro DC/DC” Converters
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
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 Output Voltage Range : -1.2V ~ -6.0V ● Negative power supply for Optical transceiver ● Negative power supply for AMP FB Voltage ● Negative power supply for LCD VREF Voltage ● Negative power supply for CCD Output Current : 300mA @VOUT=-3.0V, VIN=3.3V(TYP.) ● General purpose Negative power supply Quiescent Current : 250μA (TYP.) Control Methods : PWM Control (XCL303 Series) : PWM/PFM Control (XCL304 Series) : 2.5MHz 0.5V ± 10mV
1.6V ± 40mV Oscillation Frequency
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 APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
XCL303/304 (VIN = 3.7V, VOUT = -3.3V)
SD=PMEG2010BELD, RFB1=150kΩ, RFB2=43kΩ 7
1 Lx 2 FB VIN 6 RFB1 CL CIN …