LT1120CN8 データシートの表示（PDF） - Linear Technology

部品番号

コンポーネント説明

メーカー

LT1120CN8

Micropower Regulator with Comparator and Shutdown

Linear Technology 

LT1120

PI FU CTIO S

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

10μF output capacitor. Can be shorted to VIN or ground

without damaging the device.

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

VIN 5

COMPOUT 7

REF

6

50k

REF

2.5V

60k

8

–INPUT

4 VOUT

2 FB

3 SHDN

1 GND

1120 BD

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.

6

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.

1120fd

Share Link: