MAX6765 データシートの表示（PDF） - Maxim Integrated

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MAX6765

Automotive Micropower Linear Regulators with Supervisor

Maxim Integrated 

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

Pin Description (continued)

PIN

MAX6765/

MAX6766

MAX6767/

MAX6768

MAX6769/

MAX6770

MAX6771/

MAX6772

MAX6773/

MAX6773B/

MAX6774/

MAX6774B

NAME

FUNCTION

Active-Low Regulator Hold Input. When HOLD is

forced low, OUT remains on even if ENABLE is pulled

—

4

—

—

—

HOLD

low. To shut down the regulator, release HOLD after

ENABLE is pulled low. Connect HOLD to OUT or

leave unconnected if unused. HOLD is internally

connected to OUT through a 1.8µA current source.

—

6

—

—

—

—

—

—

—

—

6

6

4

—

—

3

—

4

—

—

Feedback Input for Setting the Output Voltage.

6

SET

Connect SET to GND to select the preset output

voltage. Connect to an external resistive divider for

adjustable output operation.

—

RESETIN

Adjustable Reset Threshold Input. Connect to a

resistive divider to set the desired threshold.

Active-High Enable Input 1. Drive ENABLE1 high

—

ENABLE1 to turn on the regulator. ENABLE1 is internally

connected to ground through a 0.6µA current sink.

Active-High Enable Input 2. Drive ENABLE2 high

—

ENABLE2 to turn on the regulator. ENABLE2 is internally

connected to ground through a 0.6µA current sink.

Watchdog Timer Input. If WDI remains high or low

for longer than the watchdog timeout period, the

internal watchdog timer expires and the reset output

4

WDI

asserts for the reset timeout period. The internal

watchdog timer clears whenever a reset is asserted

or WDI sees a rising or falling edge. The watchdog

timer cannot be disabled. Do not leave

WDI unconnected.

—

—

—

—

Exposed Pad. EP is internally connected to GND.

—

EP

Connect EP to the ground plane to provide a low

thermal-resistance path from the IC junction to the

PCB. Do not use as the electrical connection to GND.

Detailed Description

The MAX6765–MAX6774B low-quiescent-current, high-

voltage linear regulators operate from a 4V to 72V input

voltage and deliver more than 100mA of load current.

The MAX6765–MAX6774B include an integrated µP

reset circuit that monitors the regulator output volt-

age and asserts a reset output when OUT falls below

a threshold limit, and includes an internally fixed or

adjustable reset timeout using a capacitor from TIME-

OUT to ground. All devices are available in a preset

output-voltage option of +1.8V, +2.5V, +3.3V, and +5V.

www.maximintegrated.com

The output voltage of the MAX6767–MAX6774B is adjust-

able from +1.8V to +11V using a resistive divider at

SET. The MAX6773/MAX6774 include a watchdog timer

(WDI) with a 1.6s (typ) watchdog timeout period and the

MAX6773B/MAX6774B include a watchdog timer with

a 50ms (typ) watchdog timeout period. The MAX6769/

MAX6770 feature an adjustable reset threshold using

a resistive divider between the monitored voltage,

RESETIN, and GND; see the Functional Diagrams.

The MAX6771/MAX6772 provide dual enable inputs

(ENABLE1 and ENABLE2) to turn on and off the regula-

tor either through an ignition switch or a bus transceiver.

Maxim Integrated │  9

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