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LT1120 Datasheet(PDF) 6 Page - Linear Technology |
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LT1120 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1120 1120fd GND (Pin 1): Ground. FB (Pin 2): Feedback. This is the feedback point of the regulator. When operating, it is nominally at 2.5V. Opti- mum source resistance is 200k to 500k. The feedback pin should not be driven below ground or more positive than 5V. SHDN (Pin 3): Shutdown. A logic 1 shuts off the main regulator. Caution: noise or leakage into the shutdown pin can affect output voltage. VOUT (Pin 4): Regulator Output. Main output, requires a 10 μF output capacitor. Can be shorted to VIN or ground without damaging the device. PI FU CTIO S VIN (Pin 5): Input Supply. Bypass with a 10μF capacitor. Must always be more positive than ground. REF (Pin 6): Reference. 2.5V can source or sink current. May be shorted to ground or up to 5V. Voltages in excess of 5V can damage the device. COMPOUT (Pin 7): Comparator Output. Open Collector NPN Output. May be connected to any voltage from ground to 36V more positive than ground (operates above VIN). Short-circuit protected. – INPUT (Pin 8): Comparator Input. Inverting comparator input. BLOCK DIAGRA 50k 1120 BD – + REF 2.5V 4 6 VOUT COMPOUT 60k 5 VIN 2FB 3 SHDN GND REF 8 –INPUT – + 1 7 APPLICATIO S I FOR ATIO The LT1120 is especially suited for micropower system applications. For example, the comparator section of the LT1120 may be used as a battery checker to provide an indication of low battery. Another type of system applica- tion for the LT1120 would be to generate the equivalent of split supplies off of a single power input. The regulator section provides regulated output voltage and the refer- ence, which can both source and sink current, is then an artificial system ground providing a split supply for the system. For many applications the comparator can be frequency compensated to operate as an amplifier. Compensation values for various gains are given in the data sheet. The comparator gain is purposely low to make it easier to frequency compensate as an amplifier. The NPN output is capable of sinking 10mA and can drive loads connected to voltages in excess of the positive power supply. This is useful for driving switches or linear regulators off of a higher input voltage. |
Similar Part No. - LT1120_15 |
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Similar Description - LT1120_15 |
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