LT6700HVHS6-1-TRMPBF datasheet(15/20 Pages) LINER

Part #	LT6700HVHS6-1-TRMPBF

Description	Micropower, Low Voltage, Dual Comparator with 400mV Reference

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT6700-1/LT6700-2/LT6700-3/

LT6700HV-1/LT6700HV-2/

LT6700HV-3

15

6700123ff

APPLICATIONS INFORMATION

Power Supplies

The comparator family core 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.

Flexible Window Comparator

Using the LT6700-1/LT6700HV-1 as shown in the circuits

of Figure 1, the wire-AND conﬁguration permits high

accuracy window functions to be implemented with a

Figure 1. Simple Window Comparator

simple 3-resistor voltage divider network. The section A

comparator provides the VL trip-point and the section B

comparator provides the VH trip-point, with the built-in

hysteresis providing about 1.7% recovery level at each

trip point to prevent output chatter.

For designs that are to be optimized to detect

departure

from a window limit, the nominal resistor divider values

are selected as follows (refer to the resistor designators

shown on the ﬁrst circuit of Figure 1):

R1 ≤ 400k (this sets the divider current >> IB of inputs)

R2 = R1 • (0.98 • VH/VL – 1)

R3 = R1 • (2.5 • VH – 0.98 • VH/VL)

To create window functions optimized for detecting

entry

into a window (i.e., where the output is to indicate a “com-

LT6700-1

VS

GND

R3

301k

R2

6.04k

33k

+INA

–INB OUTB

OUTA

VOUT

VS

VL

VH

3.3V

3.3V Supply Monitor

5V Supply Monitor

R1

40.2k

VOUT

HIGH = (3.1V < VS < 3.5V)

HYSTERESIS ZONES

APPROXIMATELY

2% OF TRIP VOLTAGE

LT6700-1

VS

GND

487k

6.04k

33k

+INA

–INB OUTB

OUTA

5V

40.2k

VOUT

HIGH = (4.7V < VS < 5.3V)

6700123 F01

0.1μF

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LT6700HVHS6-1-TRMPBF Datasheet(PDF) 15 Page - Linear Technology

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