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LTC3265 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3265 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  LTC3265 1 3265fa For more information www.linear.com/LTC3265 TYPICAL APPLICATION FEATURES DESCRIPTION Low Noise Dual Supply with Boost and Inverting Charge Pumps The LTC®3265 is a low noise dual polarity output power supplyincluding aboostchargepump,aninvertingcharge pump and two low noise positive and negative LDO post regulators. The boost charge pump powers the positive LDO post regulator while the inverting charge pump pow- ers the negative LDO regulator. Each LDO can provide up to 50mA of output current. The LDO output voltages can be adjusted using external resistor dividers. The charge pumps employ low quiescent current Burst Mode operation or low noise constant frequency mode. During Burst Mode operation, the boost charge pump regulates its output (VOUT+) to 0.94 • 2 • VIN_P while the inverting charge pump regulates its output (VOUT–) to –0.94 • VIN_N. In Burst Mode operation the LTC3265 draws only 135µA of quiescent current with both LDOs on. In constant frequency mode, the boost and inverting charge pumps produce outputs equal to 2 • VIN_P and –VIN_N respectively and operate at a fixed 500kHz or to a programmed value between 50kHz to 500kHz using an external resistor. The LTC3265 is available in low profile 3mm × 5mm × 0.75mm 18-lead DFN and thermally enhanced 20-lead TSSOP packages. APPLICATIONS n Boost Charge Pump Generates 2 • VIN_P (VIN_P Range: 4.5V to 16V) n Inverting Charge Pump Generates –VIN_N (VIN_N Range: 4.5V to 32V) n Low Noise Positive LDO Post Regulator Up to 50mA n Low Noise Negative LDO Post Regulator Up to 50mA n 135µA Quiescent Current in Burst Mode® Operation with Both LDO Regulators On n 50kHz to 500kHz Programmable Oscillator Frequency n Stable with Ceramic Capacitors n Short-Circuit/Thermal Protection n Low Profile 3mm × 5mm 18-Lead DFN and Thermally Enhanced 20-Lead TSSOP Packages n Low Noise Bipolar/Inverting Supplies n Industrial/Instrumentation Low Noise Bias Generators L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Low Noise ±15V Outputs from a Single 12V Input LDO Rejection of VOUT± Ripple VOUT+ 10mV/DIV AC-COUPLED VLDO+ 10mV/DIV AC-COUPLED VLDO– 10mV/DIV AC-COUPLED VOUT– 10mV/DIV AC-COUPLED 1µs/DIV 3265 TA01b VIN_P = 12V, VIN_N = VOUT+ VLDO+ = 15V VLDO– = –15V fOSC = 500kHz ILDO+ = 20mA ILDO– = –20mA VIN_N CBST+ CBST– LTC3265 RT 1µF VOUT+ VIN_P 10µF 10µF 10µF +15V 12V –15V 3265 TA01a 604K 52.3k 52.3k 604K 100nF 100nF 10µF 1µF 10µF LDO+ EN+ ADJ+ EN– BYP+ MODE GND CINV+ BYP– CINV– ADJ– VOUT– LDO– |
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