LTC1642AIGN Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

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LTC1642AIGN

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Linear Technology 

LTC1642A

APPLICATIO S I FOR ATIO

Uncommitted Comparator

The uncommitted comparator has an open drain output.

The comparator has 3mV of hysteresis: the output goes

high when the differential input voltage exceeds 1.5mV

and goes low when the differential input is less than

–1.5mV.

The comparator’s input transistors are MOSFETs so the

input bias and offset currents are very small: typically

picoamps at 25°C, increasing to nanoamps at 90°C. If the

auxilliary comparator is unused, the COMP+, COMP– and

COMPOUT pins may be left floating.

Layout Considerations

One ounce copper exhibits a sheet resistance of 530µΩ

per square. To minimize self-heating, traces should be

at least 0.02" wide per ampere of current and 0.03" is

recommended.

In high current applications, the voltage drop along traces

can be appreciable. Connect the LTC1642A’s VCC and

SENSE pins directly across sense resistor R2 to prevent

the power trace’s resistance from adding to R2. It is also

a good practice to keep the resistor divider to the ON pin

close to the chip and the divider’s connections to the VCC

and GND pins short. Figure 15 shows an example layout.

ILOAD

SENSE

RESISTOR, R2

TO SHORT

VCC PIN R6

R2

LT1642A

R5

ILOAD

1642a F15

Figure 15. Recommended Layout for R1, R2 and R5

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1642af

15

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