LT6703I-3 Просмотр технического описания (PDF) - Linear Technology

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LT6703I-3

Micropower, Low Voltage Comparator with 400mV Reference

Linear Technology 

LT6703-2/LT6703-3

LT6703HV-2/LT6703HV-3

APPLICATIONS INFORMATION

Comparator Input

The comparator input can range from ground to 18V (36V

for LT6703HV), regardless of the supply voltage used. The

typical input current for inputs well above the threshold

(i.e., >800mV) is a few pA leaking into the input. With

decreasing input voltage, a small bias current begins

to be drawn out of the input, reaching a few nA when at

ground potential. The input may be forced 100mV below

ground without causing an improper output, though some

additional bias current will begin to flow from the ESD

input protection diode. Inputs driven further negative than

100mV below ground will not cause damage provided the

current is limited to 10mA.

Power Supplies

The comparator circuitry operates from a single 1.4V

to 18V supply. A minimum 0.1μF bypass capacitor is

required between the VS pin and GND. When an output

load is connected to the supply rail near the part and the

output is sinking more than 5mA, a 1μF bypass capacitor is

recommended. In instances where the supply is relatively

“soft” (such as with small batteries) and susceptible to

load steps, an additional 47Ω series decoupling resistor

can further improve isolation of supply transients from

the VS pin.

Comparator Output

The comparator output is open collector and capable of

sinking 40mA typical. Load currents are directed out of

the GND pin of the part. The output off-state voltage may

range between – 0.3V and 18V (36V for LT6703HV) with

respect to ground, regardless of the supply voltage used.

When the output high state bias voltage is above 18V, a

100k minimum pull-up resistor is required and no total load

capacitor greater than 100nF should be used. If the output

high state is above 18V, caution has to be taken to prevent

a short from the output directly to the bias voltage, even

if the output is in the off state. As with any open-collector

device, the outputs of multiple comparators may be tied

together to implement wire-AND logic functions.

670323fd

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