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MAX6793：High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions

Automotive Linear Regulators with Supervisory Features

The MAX6791–MAX6796 ultra-low-quiescent-current, single-/dual-output linear regulators are ideal for automotive applications. The devices offer a wide 5V to 72V operating input range, allowing them to withstand automotive load-dump conditions while consuming only 68µA. The MAX6791–MAX6794 are dual-output regulators 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 period adjustable with an external capacitor. The MAX6791/MAX6792 feature a windowed watchdog timeout period with selectable window ratio. The watchdog 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 (active-low HOLD) that aids the implementation of a self-holding circuit without requiring external components. Once the regulator is enabled, setting active-low HOLD low forces the regulator to remain on even if ENABLE/ENABLE1 is subsequently set low. Releasing active-low HOLD shuts down the regulator. The MAX6791–MAX6796 are available in a small, thermally 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.

Key Features Low 68µA Quiescent Current Wide 5V to 72V Supply Voltage Range Output Current Single Output Up to 300mA Dual Outputs Up to 150mA per Output Low Dropout Voltage 420mV (typ) at 100mA (Single) 840mV (typ) at 100mA (Dual) Fixed Output-Voltage Options: 5V, 3.3V, 2.5V, 1.8V, or Adjustable Output (from 1.8V to 11V) ENABLE and HOLD Functionality Active-Low RESET Output: Open Drain or Push-Pull Internally Fixed (35µs, 3.125ms, 12.5ms, 50ms, or 200ms) or Capacitor-Adjustable Reset Timeout Periods Internally Fixed or Capacitor-Adjustable Watchdog Timeout Periods Windowed (Minimum/Maximum) Watchdog Timer Options (MAX6791/MAX6792) Watchdog Disable Feature Thermal, Short-Circuit, and Output Overvoltage Protection Fully Specified from -40°C to +125°C Small, Thermally Enhanced, 5mm x 5mm TQFN

MAX6791, MAX6792, MAX6793, MAX6794, MAX6795, MAX6796: Typical Application Circuit Applications/Uses Automotive

DataSheet

Parametrics

Design kits & evaluation modules

• MAX6791EVKIT

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