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LT1026 Datasheet(PDF) 4 Page - Linear Technology |
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LT1026 Datasheet(HTML) 4 Page - Linear Technology |
4 / 8 page 4 LT1026 1026fb APPLICATIONS INFORMATION The LT1026 is a nonregulating voltage converter that converts a single input voltage into both a positive and negative output at up to 15mA. A positive input voltage is first doubled and then the doubled voltage is inverted. The voltage output level is dependent on both the input voltage and the output loading. The total output current available depends on the individual loading of the outputs since loading on one output affects the load and the voltage of the other. Only four external components are needed for operation. Two charge pump capacitors and two output storage capacitors. Nominal value for these capacitors is 1 µF, but the LT1026 will operate (with reduced performance) down to 0.1 µF. Higher value capacitors (22µF) will reduce ripple and slightly lower output impedance. For higher output currents the outputs of several converters may be paral- leled with common output capacitors. The substrate diodes are an inherent part of the IC, and must always be reversed biased to isolate the individual transistors. In the LT1026 the substrate is tied to the negative output. If the negative output is not used, such as when only the voltage doubler output is needed, – VOUT must be tied to ground so the substrate diodes are properly biased. The substrate diodes must never become forward biased even during overload conditions. For ex- ample, pulling – VOUT positive with respect to ground can forward bias the substrate diodes. Clamping the substrate to ground with an external diode would be needed to ensure proper operation and prevent the substrate from carrying any current. No overload protection is included on the LT1026. Neither output is damaged by momentary shorts, but during sustained shorts the resulting high current flow will over- heat the IC. Ripple Output Voltage vs Temperature OUTPUT CAPACITOR ( µF) 1.0 0 10 20 30 40 60 2.2 4.7 10 22 1026 • TPC07 47 100 50 VIN = 5V IL = 5mV BOTH OUTPUTS TEMPERATURE ( °C) –50 –10 –8 –4 –2 0 10 4 0 50 75 LT1026 • TPC08 –6 6 8 2 –25 25 100 125 C = 22 µF VIN = 5V IL = 1mA TYPICAL PERFORMANCE CHARACTERISTICS |
Similar Part No. - LT1026_03 |
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Similar Description - LT1026_03 |
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