LT6703HDC-2-TRMPBF datasheet(10/12 Pages) LINER

Part #	LT6703HDC-2-TRMPBF

Description	Micropower, Low Voltage Comparator with 400mV Reference

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Manufacturer	LINER [Linear Technology]

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LT6703-2/LT6703-3

10

670323fa

The LT6703-2/LT6703-3 devices are micropower compara-

tors with a built-in 400mV reference. Features include wide

supply voltage range (1.4V to 18V), Over-The-Top input and

output range, 2% accurate rising input threshold voltage

and 6.5mV typical built-in hysteresis.

Internal Reference

Each comparator has one input available externally. The two

versions of the part differ by the polarity of the available

input (i.e., inverting or noninverting). The other comparator

input is connected internally to the 400mV reference. The

rising input threshold voltage of the comparator is designed

to be equal to that of the reference (i.e., ≈400mV). The

reference voltage is established with respect to the device

GND connection.

Hysteresis

Each comparator has built-in 6.5mV (typical) of hysteresis

to simplify designs, to insure stable operation in the pres-

ence of noise at the inputs, and to reject supply rail noise

that might be induced by state change load transients. The

hysteresis is designed such that the falling input threshold

voltage is nominally 393.5mV. External positive feedback

APPLICATIONS INFORMATION

circuitry can be employed to increase effective hysteresis

if desired, but such circuitry will provide an apparent effect

on both the rising and falling input thresholds (the actual

internal thresholds remain unaffected).

Comparator Input

The comparator input can range from ground to 18V,

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.

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 with respect to ground,

regardless of the supply voltage used. As with any open-

collector device, the outputs of multiple comparators may

be tied together to implement wire-AND logic functions.

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.

THRESHOLD EQUATIONS:

670323 F01

R4

OUT

+IN

GND

VS

LT6703-3

R3

R2

R1

VIN

VOUT

VIN (L TO H) = (400mV) • (R1) •

+

)

( 1

R1

1

R2

1

R3

VIN (H TO L) = (393mV) • (R1) •

+

–

( 1

R1

1

R2

1

R3 + R4

)

(VS•R1

R3 + R4

Figure 1. Additional Hysteresis Circuit

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LT6703HDC-2-TRMPBF Datasheet(PDF) 10 Page - Linear Technology

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