MAX6791_11 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions

19-3875; Rev 2; 10/11
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High-Voltage, Micropower, Single/Dual
Linear Regulators with Supervisory Functions
General Description
The MAX6791–MAX6796 ultra-low-quiescent-current,
single-/dual-output linear regulators are ideal for auto-
motive applications. The devices offer a wide 5V to 72V
operating input range, allowing them to withstand auto-
motive load-dump conditions while consuming only
68µA. The MAX6791–MAX6794 are dual-output regula-
tors capable of supplying up to 150mA per output. The
MAX6795/MAX6796 offer a single output capable of
delivering up to 300mA. These devices offer standard
output-voltage options (5V, 3.3V, 2.5V, or 1.8V) and can
be adjusted to any voltage from 1.8V to 11V. The
MAX6791–MAX6794 also offer a fixed 5V output.
All devices feature a push-pull or open-drain, active-low
RESET output with a fixed output reset threshold that is
92.5%/87.5% of the regulator output OUT/OUT1. The
reset output asserts low when OUT/OUT1 drops below
the reset threshold and remains low for the fixed or
capacitor-adjustable reset timeout period after
OUT/OUT1 exceeds the reset threshold.
The MAX6791–MAX6796 provide a watchdog input that
monitors a pulse train from the microprocessor (µP) and
generates reset pulses if the watchdog input remains
high or low for a duration longer than the watchdog
timeout period. All devices are available with either a
fixed watchdog timeout period of 280ms (min) or a peri-
od adjustable with an external capacitor. The
MAX6791/MAX6792 feature a windowed watchdog
timeout period with selectable window ratio. The watch-
dog feature can be disabled.
The MAX6791–MAX6794 provide dual enable inputs
(ENABLE1 and ENABLE2) that control each regulator
independently. The single-output MAX6795/MAX6796
feature one enable input (ENABLE).
All devices include a hold input (HOLD) that aids the
implementation of a self-holding circuit without requir-
ing external components. Once the regulator is
enabled, setting HOLD low forces the regulator to
remain on even if ENABLE/ENABLE1 is subsequently
set low. Releasing HOLD shuts down the regulator.
The MAX6791–MAX6796 are available in a small, ther-
mally enhanced TQFN package. The 5mm x 5mm
package dissipates up to 2.7W, supporting continuous
regulator operation during high ambient temperatures,
high battery voltage, and high load-current conditions.
The MAX6791–MAX6796 are specified for a -40°C to
+125°C operating temperature range.
Automotive
Applications
Features
o Low 68µA Quiescent Current
o Wide 5V to 72V Supply Voltage Range
o Output Current
Single Output Up to 300mA
Dual Outputs Up to 150mA per Output
o Low Dropout Voltage
420mV (typ) at 100mA (Single)
840mV (typ) at 100mA (Dual)
o Fixed Output-Voltage Options: 5V, 3.3V, 2.5V,
1.8V, or Adjustable Output (from 1.8V to 11V)
o ENABLE and HOLD Functionality
o RESET Output: Open Drain or Push-Pull
o Internally Fixed (35µs, 3.125ms, 12.5ms, 50ms, or
200ms) or Capacitor-Adjustable Reset Timeout
Periods
o Internally Fixed or Capacitor-Adjustable
Watchdog Timeout Periods
o Windowed (Minimum/Maximum) Watchdog Timer
Options (MAX6791/MAX6792)
o Watchdog Disable Feature
o Thermal, Short-Circuit, and Output Overvoltage
Protection
o Fully Specified from -40°C to +125°C
o Small, Thermally Enhanced, 5mm x 5mm TQFN
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6791TP_D _+
-40°C to +125°C 20 TQFN-EP*
MAX6792TP_D _+
-40°C to +125°C 20 TQFN-EP*
MAX6793TP_ D_+
-40°C to +125°C 20 TQFN-EP*
MAX6794TP_ D_+
-40°C to +125°C 20 TQFN-EP*
MAX6795TP_ D_+
-40°C to +125°C 20 TQFN-EP*
MAX6795TP_D _/V+ -40°C to +125°C 20 TQFN-EP*
MAX6795TPSD2/V+ -40°C to +125°C 20 TQFN-EP*
MAX6796TP_D _+
-40°C to +125°C 20 TQFN-EP*
+Denotes lead-free package.
For tape-and-reel, add a T after the “+.” Tape-and-reel are
offered in 2.5k increments. The first placeholder “_” designates
preset output-voltage option and preset reset threshold level;
see Table 1. The second placeholder “_ ” designates the reset
timeout period; see Table 2. For example, the MAX6791TPSD3+
indicates a 3.3V output voltage with a reset threshold of 87.5%
at nominal voltage and a 50ms reset timeout period. Samples
are generally held in stock. Nonstandard versions require a 2.5k
minimum order quantity.
/V Denotes an automotive-qualified part.
*EP = Exposed pad.
Typical Application Circuit, Pin Configurations, and Selector
Guide appear at end of data sheet.
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