LT3472 Datasheet | Linear Technology

.. LT3472 Boost and Inverting DC/DC Converter for CCD Bias DESCRIPTIO The LT®3472 dual channel switching regulator generates positive and negative outputs for biasing CCD imagers. The device delivers up to - 8V at 50m A and 15V at 20m A from a lithium-ion cell, providing bias for many popular CCD imagers. Switching at 1.1MHz, the LT3472 uses tiny, low profile capacitors and inductors and generates low noise outputs that are easy to filter. Schottky diodes are internal and the output voltages are set with one resistor per channel, reducing external ponent count. The entire solution is less than 1mm profile and occupies just 50mm2. Internal sequencing circuitry disables the negative channel until the positive channel has reached 88% of its final value, ensuring that the sum of the two outputs is always positive. Separate soft-start capacitors for each output allow the ramp of each output to be independently controlled. The LT3472 is available in a low profile (0.75mm) 10-pin 3mm × 3mm DFN package. Features - - - - - - - - - Generates 15V at 20m A, - 8V at 50m A from a Li-Ion Cell Internal Schottky Diodes VIN Range: 2.2V to 16V Output Voltages Up to ±34V Capacitor-Programmable Soft-Start Sequencing: Positive Output Reaches 88% of Final Value Before Negative Output Begins Requires Only One Resistor to Set Output Voltage Constant Switching Frequency Ensures Low Noise Outputs Available in a 10-Lead (3mm × 3mm) DFN Package U APPLICATIO S - - - - CCD Bias TFT LCD Bias OLED Bias ± Rail Generation for Op Amps , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO VIN 3V TO 4.2V 22µH 47µH Li-Ion CCD Bias Supply Conversion Efficiency 2.2µF 1µF 85 80 75 POS CHANNEL EFFICIENCY (%) VPOS 15V 20m A SWP VPOS 550k FBP 4.7p F SWN DN 70 65 60 55 50 LT3472 320k FBN 10p F 47µH VNEG - 8V 50m...