MAX5023 Просмотр технического описания (PDF) - Maxim Integrated

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MAX5023

65V, Low-Quiescent-Current, High-Voltage Linear Regulators with µP Reset and Watchdog Timer

Maxim Integrated 

65V, Low-Quiescent-Current, High-Voltage Linear

Regulators with µP Reset and Watchdog Timer

Detailed Description

The MAX5023/MAX5024 high-voltage linear regulators

include an integrated µP reset circuit and watchdog

timer/adjustable output voltage. The devices guarantee

150mA load drive and are available with preset output

voltages of +3.3V or +5V. The MAX5023 features a

watchdog timer (WDI) with a 1.6s timeout period. The

MAX5024 offers an adjustable output voltage using an

external resistive-divider network between SET and

OUT. The internal reset circuit monitors the regulator

output voltage and asserts a reset output when the reg-

ulator output falls below the µP supply tolerance. Other

features include reverse-voltage protection to -60V,

enable (EN) and hold (HOLD) regulator control inputs,

16µA (max) shutdown current, short-circuit protection,

and thermal shutdown.

Regulator

The regulator accepts an input voltage range from

+6.5V to +65V. The MAX5023/MAX5024 offer fixed out-

put voltages of +3.3V and +5V. The MAX5024 also fea-

tures an adjustable output voltage that is implemented

with an external resistive-divider network connected

between OUT, SET, and GND (Figure 1). The MAX5024

automatically determines the feedback path depending

on the voltage at SET. Featured characteristics include

reverse-voltage protection to -60V and enable and hold

regulator control inputs. The Typical Operating Circuit

shows a self-holding configuration for the MAX5023.

Functional Diagram

IN +6.5V to +65V

OUT

REVERSE BATTERY PROTECTION

HOLD

EN

4µA

CONTROL

LOGIC

BANDGAP

REFERENCE

AMP

+2.5V to +11V

OUT

THERMAL

SENSOR

MUX

CURRENT

SENSOR AND

REGULATOR

COMP

(MAX5024 ONLY)

TO INTERNAL SHUTDOWN

CIRCUITRY

R1

SET

R2

RESET

WDI*

WATCHDOG

200ms

TIMER AND

TIMEOUT

LOGIC

PERIOD

GND

*MAX5023 ONLY.

Figure 1. Functional Diagram

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