Datasheet LT1120 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Micropower Regulator with Comparator and Shutdown |
| Seiten / Seite | 12 / 6 — PI FU CTIO S. GND (Pin 1):. VIN (Pin 5):. FB (Pin 2):. REF (Pin 6):. … |
| Dateiformat / Größe | PDF / 138 Kb |
| Dokumentensprache | Englisch |
PI FU CTIO S. GND (Pin 1):. VIN (Pin 5):. FB (Pin 2):. REF (Pin 6):. COMPOUT (Pin 7):. SHDN (Pin 3):. VOUT (Pin 4):. – INPUT (Pin 8):
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LT1120
U U U PI FU CTIO S GND (Pin 1):
Ground.
VIN (Pin 5):
Input Supply. Bypass with a 10μF capacitor. Must always be more positive than ground.
FB (Pin 2):
Feedback. This is the feedback point of the regulator. When operating, it is nominally at 2.5V. Opti-
REF (Pin 6):
Reference. 2.5V can source or sink current. mum source resistance is 200k to 500k. The feedback pin May be shorted to ground or up to 5V. Voltages in excess should not be driven below ground or more positive than of 5V can damage the device. 5V.
COMPOUT (Pin 7):
Comparator Output. Open Collector
SHDN (Pin 3):
Shutdown. A logic 1 shuts off the main NPN Output. May be connected to any voltage from regulator. Caution: noise or leakage into the shutdown pin ground to 36V more positive than ground (operates above can affect output voltage. VIN). Short-circuit protected.
VOUT (Pin 4):
Regulator Output. Main output, requires a
– INPUT (Pin 8):
Comparator Input. Inverting comparator 10μF output capacitor. Can be shorted to VIN or ground input. without damaging the device.
W BLOCK DIAGRA
REF 6 V 5 IN 50k + – COMPOUT 7 – + 4 VOUT REF 2.5V 2 FB 60k 3 SHDN 1 GND 1120 BD 8 –INPUT
U U W U APPLICATIO S I FOR ATIO
The LT1120 is especially suited for micropower system For many applications the comparator can be frequency applications. For example, the comparator section of the compensated to operate as an amplifier. Compensation LT1120 may be used as a battery checker to provide an values for various gains are given in the data sheet. The indication of low battery. Another type of system applica- comparator gain is purposely low to make it easier to tion for the LT1120 would be to generate the equivalent of frequency compensate as an amplifier. The NPN output is split supplies off of a single power input. The regulator capable of sinking 10mA and can drive loads connected to section provides regulated output voltage and the refer- voltages in excess of the positive power supply. This is ence, which can both source and sink current, is then an useful for driving switches or linear regulators off of a artificial system ground providing a split supply for the higher input voltage. system. 1120fd 6
U U U PI FU CTIO S GND (Pin 1):
Ground.
VIN (Pin 5):
Input Supply. Bypass with a 10μF capacitor. Must always be more positive than ground.
FB (Pin 2):
Feedback. This is the feedback point of the regulator. When operating, it is nominally at 2.5V. Opti-
REF (Pin 6):
Reference. 2.5V can source or sink current. mum source resistance is 200k to 500k. The feedback pin May be shorted to ground or up to 5V. Voltages in excess should not be driven below ground or more positive than of 5V can damage the device. 5V.
COMPOUT (Pin 7):
Comparator Output. Open Collector
SHDN (Pin 3):
Shutdown. A logic 1 shuts off the main NPN Output. May be connected to any voltage from regulator. Caution: noise or leakage into the shutdown pin ground to 36V more positive than ground (operates above can affect output voltage. VIN). Short-circuit protected.
VOUT (Pin 4):
Regulator Output. Main output, requires a
– INPUT (Pin 8):
Comparator Input. Inverting comparator 10μF output capacitor. Can be shorted to VIN or ground input. without damaging the device.
W BLOCK DIAGRA
REF 6 V 5 IN 50k + – COMPOUT 7 – + 4 VOUT REF 2.5V 2 FB 60k 3 SHDN 1 GND 1120 BD 8 –INPUT
U U W U APPLICATIO S I FOR ATIO
The LT1120 is especially suited for micropower system For many applications the comparator can be frequency applications. For example, the comparator section of the compensated to operate as an amplifier. Compensation LT1120 may be used as a battery checker to provide an values for various gains are given in the data sheet. The indication of low battery. Another type of system applica- comparator gain is purposely low to make it easier to tion for the LT1120 would be to generate the equivalent of frequency compensate as an amplifier. The NPN output is split supplies off of a single power input. The regulator capable of sinking 10mA and can drive loads connected to section provides regulated output voltage and the refer- voltages in excess of the positive power supply. This is ence, which can both source and sink current, is then an useful for driving switches or linear regulators off of a artificial system ground providing a split supply for the higher input voltage. system. 1120fd 6