MAX6765_07 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – Automotive Micropower Linear Regulators with Supervisor

19-0657; Rev 2; 7/07
Automotive Micropower Linear Regulators
with Supervisor
General Description
The MAX6765–MAX6774B are low-quiescent-current,
high-voltage linear regulators that operate from 4V to 72V
and deliver up to 100mA of load current. These low-
power devices consume only 31µA of quiescent current,
making them ideal for always-on automotive modules.
These devices are offered with fixed standard output
options of 5.0V, 3.3V, 2.5V, and 1.8V, or can be adjusted
from 1.8V to 11V with two external resistors.
The MAX6765–MAX6774B feature a push-pull or open-
drain, active-low RESET output with either fixed or
adjustable thresholds. Whenever the regulator’s output
falls below the reset threshold, the RESET output asserts
and remains asserted for at least the minimum reset
timeout period after the output voltage exceeds its
threshold. The minimum reset timeout period is offered
with fixed values from 75µs to 200ms or can be adjusted
externally with a small capacitor.
These devices provide three regulator enable modes to
accommodate several power-on schemes. The
MAX6765/MAX6766/MAX6769/MAX6770/MAX6773/
MAX6773B/MAX6774/MAX6774B feature a single tradi-
tional enable input (ENABLE) to turn on and off the regula-
tor. The MAX6771/MAX6772 provide dual enable inputs
(ENABLE1 and ENABLE2) to turn on and off the regulator
either through an ignition switch or a bus transceiver. The
MAX6767/MAX6768 provide a hold input (HOLD) in addi-
tion to the enable input to allow for the implementation of a
self-holding circuit without requiring external components.
Setting HOLD low after enabling the regulator forces the
regulator to remain on even if ENABLE is subsequently
set low. Releasing HOLD shuts down the regulator.
The MAX6773/MAX6773B/MAX6774/MAX6774B also
include a watchdog input that monitors a pulse train from
the microprocessor (µP) and generates a reset pulse if
the watchdog input remains high or low for a duration
longer than the 1.6s (typ) (MAX6773/MAX6774) or 50ms
(typ) (MAX6773B/MAX6774B) watchdog timeout period.
The MAX6765–MAX6774B are available in a small, ther-
mally enhanced 3mm x 3mm TDFN package that can
dissipate up to 1.951W, thereby supporting continuous
regulator operation during high ambient temperatures,
high battery voltage, and high load-current conditions.
The MAX6765–MAX6774B are fully specified for a -40°C
to +125°C operating temperature range.
Automotive
Applications
Industrial
Telecom
Typical Application Circuit and Selector Guide appear at
end of data sheet.
Features
♦ Low 31µA Quiescent Current
♦ 4V to 72V Wide Input Voltage Range
♦ 100mA Output Current Capability
♦ Dropout Voltage of 620mV with 5V Output
at 100mA
♦ Fixed Output-Voltage Options: 5V, 3.3V, 2.5V,
and 1.8V
♦ Watchdog Timer Option (1.6s (MAX6773/
MAX6774) and 50ms (MAX6773B/MAX6774B))
♦ Adjustable Output Voltages from 1.8V to 11V
♦ Open-Drain or Push-Pull RESET Output
♦ Fixed or Capacitor-Adjustable Reset Timeouts
♦ Small, Thermally Enhanced 1.9W, 3mm x 3mm
TDFN Package
♦ Overtemperature and Short-Circuit Protection
♦ Fully Specified from -40°C to +125°C
Ordering Information
PART
TEMP
RANGE
PIN-
PKG
PACKAGE CODE
MAX6765TT_D_+ -40°C to +125°C 6 TDFN-EP* T633-2
MAX6766TT_D_+ -40°C to +125°C 6 TDFN-EP* T633-2
Ordering Information continued at end of data sheet.
The first “_” is a placeholder for the voltage output and reset
threshold. The 2nd “_” designates the fixed reset-timeout option.
See Tables 1 and 2 for details. For example, the MAX6765TTLD4
has a 5V output, a reset threshold of 4.65V, and a 200ms typical
reset timeout.
+Denotes lead-free package.
*EP = Exposed paddle.
For tape-and-reel orders add a “T” after the “+” symbol to com-
plete the part number. Tape-and-reel orders are available in
2.5k increments. Nonstandard versions require a 10k minimum
order quantity.
Pin Configurations
TOP VIEW
6
5
4
MAX6765
MAX6766
+
1
2
3
TDFN
Pin Configurations continued at end of data sheet.
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