MAX6780 Просмотр технического описания (PDF) - Maxim Integrated

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MAX6780

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

Maxim Integrated 

Low-Power, 1%-Accurate Battery

Monitors in µDFN and SC70 Packages

Detailed Description

These battery monitors have an active-low output that

asserts when the input falls below a set voltage. They

also offer hysteresis for noise immunity, and to remove

the possibility of output chatter due to battery terminal

voltage recovery after load removal. They are available

with one or two monitors per package, with push-pull or

open-drain outputs, and with internally set or externally

adjustable hysteresis (dual-channel devices offer only

internally fixed hysteresis). Figures 1, 2, and 3 show

block diagrams and typical connections. See the

Selector Guide for details.

Low-Battery Output

All devices are offered with either push-pull or open-

drain outputs (see the Selector Guide). The MAX6781

has one push-pull output and one open-drain output,

configured as in Table 1.

On all devices with open-drain outputs an external

pullup resistor is required. The open-drain pullup resis-

tor can connect to an external voltage up to +6V,

regardless of the voltage at BATT.

Table 1. MAX6781 Outputs

DEVICE

MAX6781

LBO1

Push-Pull

LBO2

Open-Drain

VBATT

BATT

MAX6779

MAX6780

MAX6781

LBI1

1

LBO1

HYSTERESIS

CONTROL

0

VREF

0

1

LBI2

LBO2

GND

Figure 2. Dual-Channel Fixed-Hysteresis Block Diagram

VBATT

BATT

RH

LBI

MAX6775

MAX6776

HYSTERESIS 1

LBO

RL

CONTROL

0

VREF

GND

Figure 1. Single-Channel Fixed-Hysteresis Block Diagram

VBATT

BATT

RH

MAX6777

MAX6778

LBL 1

RHYST

LBH 0

LBO

RL

VREF

GND

Figure 3. Single-Channel Adjustable-Hysteresis Block Diagram

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