MAX6781 Просмотр технического описания (PDF) - Maxim Integrated

Номер в каталоге

Компоненты Описание

Список матч

MAX6781

Low-Power, 1%-Accurate Battery Monitors in µDFN and SC70 Packages

Maxim Integrated 

Low-Power, 1%-Accurate Battery

Monitors in µDFN and SC70 Packages

Calculating an External

Hysteresis Resistive Divider

Setting the hysteresis externally requires calculating

three resistor values, as indicated in Figure 3. First cal-

culate RH using:

RH

=

eA

x VBATT

IL

and RL0 using:

RL0

= − VLBIR x RH

VLBIR − VBATT

(as in the above example). Where RL0 equals RL +

RHYST, determine the total resistor-divider current,

ITOTAL, at the trip voltage using:

ITOTAL

=

VBATT

RH + RL0

Then, determine RHYST using:

RHYST

=

VHYST

ITOTAL

where VHYST is the required hysteresis voltage.

Finally, determine RL using:

RL = RL0 - RHYST

Monitoring a Battery Voltage Higher

Than the Allowable VBATT

For monitoring higher voltages, supply power to BATT

that is within the specified supply range, and power the

input resistive divider from the high voltage to be moni-

tored. Do not exceed the Absolute Maximum Ratings.

Adding External Capacitance to

Reduce Noise and Transients

If monitoring voltages in a noisy environment, add a

bypass capacitor of 0.1µF from BATT to GND as close

as possible to the device. For systems with large tran-

sients, additional capacitance may be required. A small

capacitor (<1nF) from LBI_ to GND may provide addi-

tional noise immunity.

PART

MAX6775XK_+T

MAX6775LT_+T

MAX6776XK_+T

MAX6776LT_+T

MAX6777XK+T

MAX6777LT+T

MAX6778XK+T

MAX6778LT+T

MAX6779LT_+T

MAX6780LT_+T

MAX6781LT_+T

LBO OUTPUT

Single

Single

Single

Single

Single

Single

Single

Single

Dual

Dual

Dual

OUTPUT TYPE

Push-Pull

Push-Pull

Open-Drain

Open-Drain

Push-Pull

Push-Pull

Open-Drain

Open-Drain

Push-Pull

Open-Drain

Mixed

Selector Guide

HYSTERESIS

Fixed

Fixed

Fixed

Fixed

Adjustable

Adjustable

Adjustable

Adjustable

Fixed

Fixed

Fixed

PIN-PACKAGE

5 SC70-5

6 µDFN-6

5 SC70-5

6 µDFN-6

5 SC70-5

6 µDFN-6

5 SC70-5

6 µDFN-6

6 µDFN-6

6 µDFN-6

6 µDFN-6

8 _______________________________________________________________________________________

Share Link: