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