Monolithic Power Systems Inc. MPQ6400DG-01-LF-P

Overview

MPQ6400DG-01-LF-P from Monolithic Power Systems is a low-quiescent-current, AEC-Q100-qualified voltage supervisor IC designed to monitor system supply rails ≥0.4V and assert an open-drain RESET signal upon undervoltage or manual reset assertion. It features ±1% threshold accuracy, 1.6μA typical quiescent current, programmable reset delay (2.1ms–10s via external capacitor), and operates from 1.8V to 5.5V VCC. Used in automotive ADAS and body control modules where battery life and reset reliability are critical.

For engineers reviewing the MPQ6400DG-01-LF-P datasheet, MPQ6400DG-01-LF-P pinout, MPQ6400DG-01-LF-P application, or MPQ6400DG-01-LF-P equivalent, key selection criteria include adjustable SENSE threshold (0.4V+), CDELAY-based delay programming, AEC-Q100 qualification, QFN-6 (2mm×2mm) package, and guaranteed RESET validity down to VCC = 0.8V.

Technical Context

The MPQ6400DG-01-LF-P implements a precision bandgap reference with ±1% VIT accuracy and 1.5–4% hysteresis to reject noise-induced false resets. Its SENSE input accepts voltages as low as 0.4V when configured with an external resistor divider, enabling monitoring of sub-1V logic rails or custom power domains.

Reset assertion is triggered by either falling SENSE voltage below VIT or MR pin pulled low; deassertion occurs only after both inputs exceed thresholds and the CDELAY-sourced delay timer expires. The internal 140nA current source charges the external CDELAY capacitor to 1.13V to determine delay - enabling precise timing from 2.1ms to 10s with ≥150pF ceramic capacitors.

Key Specifications

Pinout & Package

MPQ6400DG-01-LF-P is housed in a RoHS-compliant, lead-free QFN-6 package (2mm × 2mm, 0.65mm pitch) with exposed thermal pad. Pin 1 identification is marked by a dot or notch per JEDEC MO-229 VCCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3808G33DBVR and MAX6326UT33+T, MPQ6400DG-01-LF-P uniquely supports user-defined voltage thresholds from 0.4V, offers capacitor-programmable delay (2.1ms–10s), includes MR functionality, and maintains AEC-Q100 qualification - making it the only option suitable for multi-rail, dynamically configurable automotive power supervision.

Availability

MPQ6400DG-01-LF-P is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), electric vehicle battery management subsystems, and automotive infotainment head units requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MPQ6400DG-01-LF-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs for automotive, industrial, cloud computing, and consumer applications.

The MPQ6400 product line delivers AEC-Q100-qualified voltage supervisors optimized for automotive subsystems requiring ultra-low quiescent current, precise reset timing, and flexible voltage monitoring - particularly in ADAS, body electronics, and EV power architectures.

FAQ

What is the minimum monitored voltage supported by MPQ6400DG-01-LF-P?

The MPQ6400DG-01-LF-P supports adjustable SENSE threshold monitoring down to 0.4V, achieved using an external resistor divider network connected to the SENSE pin. This capability is exclusive to the -01 variant and enables supervision of sub-1V logic rails such as FPGA core supplies or low-voltage microcontroller domains.

How is the reset delay time programmed on MPQ6400DG-01-LF-P?

Reset delay is programmed via the CDELAY pin: floating yields 24ms, connecting to VCC yields 380ms, and connecting a capacitor (≥150pF) to GND enables precise delays from 2.1ms to 10s. The internal 140nA current source charges the capacitor to 1.13V; delay time is calculated as t_D ≈ (C_DELAY × 10⁻⁹) × 4.99 × 10⁷ seconds.

Does MPQ6400DG-01-LF-P require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and requires an external pull-up resistor ≥10kΩ to a valid supply (up to 6V). This enables level-shifting above VCC and wired-OR connection with other reset sources. Without the pull-up, RESET remains undefined and cannot drive a logic-high state.

What is the significance of the "-LF" suffix in MPQ6400DG-01-LF-P?

The "-LF" suffix indicates lead-free and halogen-free packaging compliant with the EU RoHS directive. It confirms that the device meets environmental regulations for restricted substances and is suitable for green manufacturing processes without compromising electrical or thermal performance in the QFN-6 package.

Can MPQ6400DG-01-LF-P monitor voltages higher than its VCC supply?

No - the SENSE pin voltage must remain within absolute maximum ratings (-0.3V to 6V), but functional monitoring requires VSENSE ≤ VCC for accurate threshold comparison. For rails exceeding VCC (e.g., 12V), a resistor divider must scale the voltage to ≤VCC while maintaining sufficient signal integrity and noise immunity.

Is the MPQ6400DG-01-LF-P pin-compatible with other MPQ6400 variants?

Yes - all MPQ6400 variants (e.g., MPQ6400DG-33, MPQ6400DJ-01-AEC1) share identical pinout and footprint across QFN-6 and TSOT23-6 packages. The -01 variant differs functionally (adjustable threshold) but not physically, enabling drop-in replacement in layouts designed for fixed-threshold versions.

What is the maximum transient duration the SENSE pin can ignore without asserting RESET?

The SENSE pin is immune to negative transients ≤17.5μs when overdriven by ±5% of VIT. This specification ensures robust operation in noisy automotive environments - for example, rejecting coupling from nearby DC-DC converters or motor drivers without causing spurious resets.