LT6700HVHS6-3-TRMPBF datasheet(15/20 Pages) LINER

Part #	LT6700HVHS6-3-TRMPBF

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

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Manufacturer	LINER [Linear Technology]

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LT6700/LT6700HV

6700123fg

applicaTions inForMaTion

using a supply filter, the start-up time of the LT6700 will

increase to:

tSTART = (0.17ms + 0.25 • tRC) • ΔVS

Where tSTART and tRC are in milliseconds and ΔVS is the

change in supply in volts. The low supply current of the

LT6700 should not cause significant voltage drop due to

a 2k maximum series R.

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

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-

ing into spec” condition, as with the examples in Figure 1),

Figure 1. Simple Window Comparator

the nominal resistor values are selected as follows:

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

R2 = R1 • (1.02 • VH/VL – 1)

R3 = R1 • (2.54 • VH – 1.02 • VH/VL)

The worst-case variance of the trip-points is related to

the specified threshold limits of the LT6700/LT6700HV

device and the basic tolerance of divider resistors used.

For resistor tolerance RTOL (e.g. 0.01 for 1%), the worst-

case trip-point voltage (either VH or VL) deviations can be

predicted as follows (italicized values are taken from the

data sheet, expressed in volts):

Max dev VTRIP↑ = ±VTRIPnom • {2 • RTOL • [(VTRIPnom – 0.4)

/ VTRIPnom] + 1.25 • (VTH(R)max – VTH(R)min)}

Max dev VTRIP↓=±VTRIPnom•{2•RTOL•[(VTRIPnom–0.39)

/ VTRIPnom] + 1.27 • (VTH(F)max – VTH(F)min)}

Generating an External Reference Signal

In some applications, it would be advantageous to have

access to a signal that is directly related to the internal

400mV reference, even though the reference itself is not

available externally. This can be accomplished to a reason-

able degree by using an inverting comparator section as

a “bang-bang” servo, establishing a nominal voltage, on

an integration capacitor, that is scaled to the reference.

This method is used in Figure 2, where the reference level

has been doubled to drive a resistor bridge. The section

B output cycles on and off to swing the section B input

between its hysteresis trip points as the load capacitor

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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