Monolithic Power Systems Inc. MP6400DG-25-LF-Z

Overview

MP6400DG-25-LF-Z from Monolithic Power Systems is a fixed-threshold supervisory circuit with 2.5V SENSE voltage threshold (±1% accuracy), 1.6μA typical quiescent current, and programmable reset delay from 2.1ms to 10s via external capacitor on CDELAY pin; used for power-on reset generation in battery-powered microcontroller systems.

For engineers reviewing the MP6400DG-25-LF-Z datasheet, MP6400DG-25-LF-Z pinout, MP6400DG-25-LF-Z application, or MP6400DG-25-LF-Z equivalent, key selection criteria include guaranteed reset validity down to VCC = 0.8V, open-drain RESET output compatible with 6V pull-up, immunity to 17.5µs SENSE transients, and factory-set 2.33V trip point for 2.5V rail monitoring.

Technical Context

The MP6400DG-25-LF-Z implements a precision bandgap reference and comparator-based supervision architecture with internal 90kΩ MR pull-up resistor and 140nA CDELAY charge current source. It asserts RESET when SENSE falls below 2.33V or MR drops below 0.25×VCC, and de-asserts after user-programmable delay once both inputs exceed thresholds plus hysteresis (1.5–3.5% of VIT).

Its open-drain RESET output supports level-shifting up to 6V and requires external pull-up >10kΩ; operation is guaranteed across VCC = 1.8V–6V and ambient temperature –40°C to +85°C, with thermal shutdown protection at TJ = 150°C.

Key Specifications

Pinout & Package

MP6400DG-25-LF-Z is housed in a 2mm × 2mm QFN-6 package with exposed thermal pad, RoHS-compliant and lead-free per MPS green status.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3808G33DBVR and MAX6326UT25+T, MP6400DG-25-LF-Z uniquely combines 2.5V-specific ±1% threshold, 1.6μA ICC, open-drain 6V-tolerant RESET, and integrated MR pull-up-enabling compact, low-power, dual-trigger supervision in space-constrained portable designs.

Availability

MP6400DG-25-LF-Z is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT gateways, battery-powered microcontroller systems, and FPGA configuration sequencing requiring stable component supply and long-term lifecycle support.

Supply support for MP6400DG-25-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 analog and power ICs, with design centers in the US, China, and Taiwan.

The MP6400 product line delivers ultra-low-power, precision voltage supervision for battery-critical and space-constrained embedded systems, emphasizing threshold accuracy, programmable timing, and robust transient immunity.

FAQ

What is the exact SENSE threshold voltage for MP6400DG-25-LF-Z?

The MP6400DG-25-LF-Z has a factory-trimmed SENSE threshold of 2.33V, corresponding to a nominal monitored rail of 2.5V, with ±1% accuracy over temperature and supply voltage. This value is laser-trimmed during production and does not require external resistor dividers.

Can MP6400DG-25-LF-Z operate with VCC below 1.8V?

No-MP6400DG-25-LF-Z is specified for VCC = 1.8V to 6V per its Recommended Operating Conditions. However, it guarantees valid RESET assertion down to VCC = 0.8V, meaning it will still assert reset during brownout, but full functionality (e.g., delay timing, MR response) is not assured below 1.8V.

How is the 380ms reset delay configured on MP6400DG-25-LF-Z?

The 380ms delay is selected by connecting the CDELAY pin (Pin 3) directly to VCC through a resistor between 50kΩ and 200kΩ. This configures the internal timing circuit for fixed 380ms (typical), eliminating the need for an external capacitor while retaining compatibility with the same pinout.

Does MP6400DG-25-LF-Z require an external pull-up on the RESET pin?

Yes-an external pull-up resistor >10kΩ must be connected from RESET (Pin 6) to the target logic supply (up to 6V). The open-drain output cannot drive high actively; the pull-up establishes the logic-high state after delay expiration and ensures compatibility with mixed-voltage systems.

Is the MR pin internally pulled up on MP6400DG-25-LF-Z?

Yes-the MR pin (Pin 4) features an internal 90kΩ pull-up resistor to VCC, allowing it to float for default high operation. This eliminates external components when manual reset is unused, and enables direct connection to push-button switches tied to GND without additional biasing.

What package variant does MP6400DG-25-LF-Z use?

MP6400DG-25-LF-Z uses the 2mm × 2mm QFN-6 package (MPN suffix DG), with wettable flank leads and an exposed thermal pad. The top marking is "4V", confirming the 2.5V rail supervision function per MPS ordering nomenclature.