MAX6793TP Просмотр технического описания (PDF) - Maxim Integrated

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MAX6793TP

High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions

Maxim Integrated 

High-Voltage, Micropower, Single/Dual Linear

Regulators with Supervisory Functions

PIN

MAX6791/ MAX6793/ MAX6795/

MAX6792 MAX6794 MAX6796

—

10

10, 13, 14,

15

—

—

1, 2

—

—

3

—

—

20

—

—

—

NAME

N.C.

OUT

SET

ENABLE

EP

Pin Description (continued)

FUNCTION

Not Internally Connected

Regulator Output. Fixed +5V, +3.3V, +2.5V, +1.8V, or adjustable output

(+1.8V to +11V). Connect a 10µF (min) capacitor from OUT to GND.

Feedback Input for Setting the OUT Voltage. Connect SET to GND to select the

preset output voltage. Connect to an external resistive-divider for adjustable

output operation.

Active-High Enable Input. Drive ENABLE high to turn on the regulator. ENABLE

is internally connected to ground through a 0.5µA current sink.

Exposed Pad. EP is internally connected to GND. Connect EP to the ground

plane to provide a low thermal-resistance path from the IC junction to the PC

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

Detailed Description

The MAX6791–MAX6796 ultra-low-quiescent-current,

single-/dual-output, high-input-voltage linear regulators

operate from 5V to 72V. The MAX6791–MAX6794 fea-

ture dual regulators that deliver up to 150mA of load

current per output. One output is available with preset

output-voltage options (+1.8V, +2.5V, +3.3V, and

+5.0V) and can be adjusted to any voltage between

+1.8V to +11V using an external resistive-divider at

SET1. The other output provides a fixed 5V output volt-

age. The MAX6795/MAX6796 feature a single regulator

that delivers up to 300mA of current with preset output-

voltage options (+1.8V, +2.5V, +3.3V, and +5.0V) or

can be adjusted to any voltage between +1.8V to +11V.

All devices include an integrated µP reset circuit with a

fixed/adjustable reset and watchdog timeout period.

The MAX6791–MAX6796 monitor OUT/OUT1 and

assert a reset output when the output falls below the

reset threshold.

Regulators

The single and dual regulators accept an input voltage

from 5V to 72V. The MAX6791–MAX6796 offer fixed

preset output voltages of +1.8V, +2.5V, +3.3V, and

+5V, or an adjustable output voltage of +1.8V to +11V,

selected using an external resistive-divider network

connected between OUT1/OUT, SET1/SET, and GND

(see Figure 1). In addition to an adjustable output, the

MAX6791–MAX6794 feature a fixed 5V output voltage.

Reset Output

The reset output is typically connected to the reset

input of a µP. A µP’s reset input starts or restarts the µP

in a known state. The MAX6791–MAX6796 supervisory

circuits provide the reset logic output to prevent code-

execution errors during power-up, power-down, and

brownout conditions (see the Typical Application

Circuit). RESET changes from high to low whenever the

monitored output voltage drops below the reset thresh-

old voltage or the watchdog timeout expires. Once the

monitored voltage exceeds its respective reset thresh-

old voltage, RESET remains low for the reset timeout

period, then goes high.

12 ______________________________________________________________________________________

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