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

Overview

MPQ6400DG-01-LF-Z from Monolithic Power Systems is an AEC-Q100-qualified, low-quiescent-current (1.6μA typical), programmable-delay 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 supports adjustable threshold via external resistor divider, ±1% threshold accuracy, and user-configurable delay from 2.1ms to 10s using a capacitor on CDELAY - deployed in ADAS domain controllers and battery-backed MCU power management.

For engineers reviewing the MPQ6400DG-01-LF-Z datasheet, MPQ6400DG-01-LF-Z pinout, MPQ6400DG-01-LF-Z application, or MPQ6400DG-01-LF-Z equivalent, key selection criteria include its 0.4V–5V adjustable monitoring range, guaranteed RESET validity down to VCC = 0.8V, immunity to 17.5µs SENSE transients, QFN-6 (2mm×2mm) package, and AEC-Q100 Grade 1 qualification for automotive use.

Technical Context

The MPQ6400DG-01-LF-Z implements a precision bandgap reference with ±1% typical VIT accuracy and 1.5–4% hysteresis to prevent chatter during slow-ramp or noisy supply conditions. Its internal 140nA current source charges an external capacitor on CDELAY to generate the programmable delay, with RESET de-assertion triggered at 1.13V capacitor voltage.

It features dual reset triggers: SENSE voltage falling below VIT (adjustable down to 0.4V), or MR pulled low (logic threshold at 0.25VCC). The open-drain RESET output supports rail-to-rail pull-up (up to 6V), operates validly at VCC as low as 0.8V, and draws only 2µA leakage when inactive.

Key Specifications

Pinout & Package

MPQ6400DG-01-LF-Z is housed in a thermally enhanced QFN-6 package (2mm × 2mm, 0.65mm pitch) with exposed thermal pad. Pin 1 identification is marked by a dot or index area 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-Z uniquely combines AEC-Q100 Grade 1, 0.4V–5V adjustability, ±1% accuracy, and 17.5µs transient immunity - making it the only choice for next-gen automotive subsystems requiring flexible, precision, and robust supervision.

Availability

MPQ6400DG-01-LF-Z is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), Body Control Modules (BCM), and Electric Vehicle (EV) battery management subsystems requiring stable component supply, long-term automotive lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ6400DG-01-LF-Z 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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ6400 product line targets automotive-grade voltage supervision, delivering ultra-low IQ, AEC-Q100 qualification, and field-proven reliability for safety-critical power sequencing in ADAS, infotainment, and electrification systems.

FAQ

What is the minimum VCC required for MPQ6400DG-01-LF-Z to assert a valid RESET?

The device guarantees RESET functionality down to VCC = 0.8V, meaning it will correctly detect undervoltage on the SENSE pin and assert RESET even during severe brown-out conditions such as automotive cold-cranking. Below 0.8V, RESET behavior is undefined per datasheet specification.

Can the MPQ6400DG-01-LF-Z monitor a 0.6V core rail?

Yes - the MPQ6400DG-01-LF-Z supports adjustable threshold monitoring from 0.4V upward. Using an external resistor divider (e.g., R1 = 100kΩ, R2 = 100kΩ) on the SENSE pin enables precise supervision of 0.6V rails with ±1% accuracy, validated across -40°C to +125°C.

How is the 380ms delay configured on the CDELAY pin?

To achieve the 380ms delay, connect the CDELAY pin (Pin 3) to VCC through a resistor between 50kΩ and 200kΩ. This configuration activates an internal resistor ladder that sets the delay; no capacitor is required. The value is characterized and guaranteed by design per Rev. 1.2 datasheet.

Is the RESET output compatible with 5V logic when VCC = 3.3V?

Yes - the open-drain RESET output supports pull-up to any voltage up to 6V, independent of VCC. When VCC = 3.3V, a 5V pull-up resistor ≥10kΩ is fully supported, enabling direct interfacing with legacy 5V microcontrollers or level-shifting circuits.

Does MPQ6400DG-01-LF-Z require external components beyond the CDELAY capacitor and SENSE divider?

Only three external components are mandatory: a 0.1µF ceramic decoupling capacitor on VCC, a pull-up resistor ≥10kΩ on RESET, and either an RC network (for fixed delays) or capacitor (for programmable delay) on CDELAY. No additional biasing or filtering is required for basic operation.

What is the maximum SENSE input current at 6V for MPQ6400DG-01-LF-Z?

Per datasheet Electrical Characteristics table, the SENSE input current is 100nA maximum at VSENSE = 6V and TJ = +25°C. This ultra-low leakage preserves accuracy in high-impedance resistor divider networks and minimizes loading on sensitive power rails.

How does the MR pin behave when left unconnected?

The MR pin has an internal 90kΩ pull-up to VCC, so it defaults to logic high when floating. This allows MR to be used optionally - for example, connecting it to a microcontroller GPIO only when manual reset coordination is needed, without requiring external pull-up resistors.