MAX6766 MAXIM [Maxim Integrated Products], MAX6766 Datasheet - Page 9

• Manufacturer Part Number: MAX6766
• Description: Automotive Micropower Linear Regulators with Supervisor
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6765–MAX6774 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–MAX6774 include an integrated µP reset
circuit that monitors the regulator output voltage 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 TIMEOUT to ground. All
devices are available in a preset output-voltage option of
MAX6765/
MAX6766
EP
—
—
—
—
—
—
MAX6767/
MAX6768
Automotive Micropower Linear Regulators
EP
—
—
—
—
4
6
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Detailed Description
MAX6769/
MAX6770
PIN
EP
—
—
—
—
6
4
MAX6771/
MAX6772
EP
—
—
—
6
3
4
MAX6773/
MAX6774
EP
—
—
—
—
6
4
ENABLE1
ENABLE2
RESETIN
NAME
HOLD
WDI
SET
—
+1.8V, +2.5V, +3.3V, and +5V. The output voltage of the
MAX6767–MAX6774 is adjustable from +1.8V to +11V
using a resistive divider at SET. The MAX6773/MAX6774
include a watchdog timer (WDI) with a 1.6s (typ) watch-
dog 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.
Active-Low Regulator Hold Input. When HOLD is forced
low, OUT remains on even if ENABLE is pulled 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.
Feedback Input for Setting the Output Voltage. Connect
SET to GND to select the preset output voltage.
Connect to an external resistive divider for
adjustable output operation.
Adjustable Reset Threshold Input. Connect to a
resistive divider to set the desired threshold.
Active-High Enable Input 1. Drive ENABLE1 high 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 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
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 Paddle. 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 PCB.
Do not use as the electrical connection to GND.
Pin Description (continued)
with Supervisor
FUNCTION
9