MAX6782TEA Просмотр технического описания (PDF) - Maxim Integrated

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MAX6782TEA

Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level Battery Monitors in Small TDFN and TQFN Packages

Maxim Integrated 

Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level

Battery Monitors in Small TDFN and TQFN Packages

Pin Description (continued)

MAX6786/MAX6787/MAX6788

PIN

NAME

FUNCTION

1

LBL1 Falling Trip Level Input 1. Connect to an external resistive divider to set the falling trip level.

2

LBH1 Rising Trip Level Input 1. Connect to an external resistive divider to set the rising trip level.

3

LBL2 Falling Trip Level Input 2. Connect to an external resistive divider to set the falling trip level.

4

LBH2 Rising Trip Level Input 2. Connect to an external resistive divider to set the rising trip level.

5

GND Ground

6

LBO2 Active-Low, Low-Battery Output 2. LBO2 asserts when VLBL2 falls below the falling threshold voltage. LBO2

deasserts when VLBH2 exceeds the rising threshold voltage.

7

LBO1 Active-Low, Low-Battery Output 1. LBO1 asserts when VLBL1 falls below the falling threshold voltage. LBO1

deasserts when VLBH1 exceeds the rising threshold voltage.

8

BATT Battery Input. Power supply to the device. For better noise immunity, bypass BATT to GND with a 0.1µF

capacitor as close to the device as possible.

MAX6789/MAX6790

PIN

NAME

FUNCTION

1

IN1 Overvoltage Monitor Input 1

2

IN2 Overvoltage Monitor Input 2

3

IN3 Overvoltage Monitor Input 3

4

IN4 Overvoltage Monitor Input 4

5

GND Ground

6

CLEAR

Active-Low Clear Input. OV and OV do not latch when an overvoltage fault is detected if CLEAR is held low.

CLEAR has an internal pullup resistor to BATT.

7

N.C. No Connection. Not internally connected.

Active-Low Overvoltage Output. When any of the inputs (VIN_) exceeds its respective rising threshold

8

OV voltage, OV asserts and stays asserted until CLEAR is pulled low or the power to the device is cycled. OV

does not latch when an overvoltage fault is detected if CLEAR is held low.

9

OV Active-High Overvoltage Output. Inverse of OV.

10

BATT Battery Input. Power supply to the device. For better noise immunity, bypass BATT to GND with a 0.1µF

capacitor as close to the device as possible.

Detailed Description

The MAX6782–MAX6788 are designed to monitor two

to four battery levels (1% accuracy) and assert an

active-low output indicator when the monitored voltage

level falls below the user-set threshold. Each battery

level is associated with an independent open-drain or

push-pull output. Each of these independent outputs

can be used to provide low battery warnings at differ-

ent voltage levels. Each of these monitored levels offers

fixed or adjustable hysteresis in order to prevent the

output from chattering as the battery recovers from the

lighter loads. The MAX6782–MAX6785 also feature ref-

erence outputs that can source up to 1mA.

The MAX6789/MAX6790 monitor four overvoltage con-

ditions and assert the complementary overvoltage out-

puts when any voltage at the inputs exceeds its

respective threshold. The MAX6789/MAX6790 allow

each trip threshold to be set with external resistors.

These devices also feature a latch and a clear function.

Figures 1, 2, and 3 show the simplified block diagrams

for the MAX6782–MAX6790. See the Selector Guide.

8 _______________________________________________________________________________________

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