Datasheet

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 regulator output falls below the μP
supply tolerance. Other features include reverse-voltage
protection to -60V, enable (EN) and hold (HOLD) regula-
tor 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 output volt-
ages of +3.3V and +5V. The MAX5024 also features an
adjustable output voltage that is implemented with an
external resistive-divider network connected between
OUT, SET, and GND (Figure 1). The MAX5024 auto-
matically 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.
Figure 1. Functional Diagram
REVERSE BATTERY PROTECTION
CONTROL
LOGIC
BANDGAP
REFERENCE
200ms
TIMEOUT
PERIOD
MUX
OUT
WATCHDOG
TIMER AND
LOGIC
RESET
THERMAL
SENSOR
CURRENT
SENSOR AND
REGULATOR
EN
HOLD
IN
+6.5V to +65V
OUT
TO INTERNAL SHUTDOWN
CIRCUITRY
WDI*
*MAX5023 ONLY.
SET
(MAX5024 ONLY)
+2.5V to +11V
GND
R1
R2
4µA
AMP
COMP
MAX5023/MAX5024 65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
www.maximintegrated.com
Maxim Integrated │ 8
Functional Diagram