Monolithic Power Systems Inc. MP6400DJ-30-LF-Z

Overview

MP6400DJ-30-LF-Z from Monolithic Power Systems is a low-quiescent-current (1.6µA typ), programmable-delay supervisory circuit in TSOT23-6 package, with factory-set 3.0V SENSE threshold (±1% accuracy), 380ms fixed delay when CDELAY tied to VCC, and open-drain RESET output. It monitors system voltage and asserts reset on undervoltage or manual reset assertion, targeting battery-powered microcontroller systems.

For engineers reviewing the MP6400DJ-30-LF-Z datasheet, MP6400DJ-30-LF-Z pinout, MP6400DJ-30-LF-Z application, or MP6400DJ-30-LF-Z equivalent, key selection criteria include guaranteed RESET validity down to VCC = 0.8V, immunity to ≤17.5µs SENSE transients, MR internal 90kΩ pull-up, and compatibility with 1.8–6V supply rails.

Technical Context

The MP6400DJ-30-LF-Z implements a precision voltage monitor with hysteresis (1.5–3.5% of VIT) and dual reset triggers: SENSE undervoltage detection and active-low MR input. Its internal 140nA current source charges an external capacitor on CDELAY to generate programmable delays from 2.1ms to 10s, while fixed 24ms (CDELAY float) and 380ms (CDELAY to VCC via 50–200kΩ) modes simplify timing-critical designs.

RESET is open-drain with 0.4V max VOL at 1.0mA load and supports rail-to-rail pull-up up to 6V, enabling interoperability with higher-voltage logic. The device guarantees functional reset assertion even as VCC drops to 0.8V, and SENSE input leakage is limited to ±25nA for adjustable versions-critical for high-impedance divider networks.

Key Specifications

Pinout & Package

MP6400DJ-30-LF-Z is housed in a 6-pin TSOT23 package (2.9mm × 1.6mm × 1.0mm height), RoHS-compliant and lead-free, with exposed pad not electrically connected. Pin 1 is bottom-left when viewing top marking "3S" left-to-right.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–30D3+ and TPS3808G30DBVR, MP6400DJ-30-LF-Z uniquely combines MR input, three hardware-selectable delay modes, and lowest ICC (1.6µA), making it optimal for space-constrained, battery-sensitive designs requiring flexible reset control.

Availability

MP6400DJ-30-LF-Z is available at Aetrix Electronics and suitable for battery-powered microcontroller systems, FPGA configuration monitoring, portable medical devices, and industrial PLC I/O modules requiring stable component supply and long-term manufacturability.

Supply support for MP6400DJ-30-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, and global manufacturing partnerships.

The MP6400 family targets ultra-low-power system supervision in portable, battery-operated, and energy-sensitive applications, emphasizing precision thresholding, minimal quiescent current, and flexible reset timing without external passive components.

FAQ

What is the exact SENSE threshold voltage for MP6400DJ-30-LF-Z?

The MP6400DJ-30-LF-Z has a factory-set nominal SENSE threshold of 3.0V, corresponding to a trip point of 2.79V (–7% deviation), with ±1% typical accuracy across temperature and supply voltage. This is confirmed in the Standard Versions table and Electrical Characteristics section of the MP6400 Rev. 1.1 datasheet.

Can MP6400DJ-30-LF-Z operate with a 1.8V supply?

Yes - MP6400DJ-30-LF-Z is fully specified for VCC = 1.8V to 6V. At 1.8V, the device guarantees RESET assertion when SENSE falls below 2.79V (though SENSE must be externally scaled if monitoring <1.8V), and RESET remains valid down to VCC = 0.8V, enabling robust brownout detection.

How do I configure a 380ms reset delay?

To configure 380ms delay, connect the CDELAY pin (Pin 4) to VCC through a resistor between 50kΩ and 200kΩ - no capacitor required. This mode is explicitly guaranteed by design per the Electrical Characteristics table and Application Information section, and is independent of temperature or supply variation.

Is an external pull-up resistor required on the RESET pin?

Yes - RESET is open-drain and requires an external pull-up resistor ≥10kΩ to a logic-compatible voltage (up to 6V). The datasheet specifies this in the Pin Functions and Application Information sections, noting that lower resistance increases noise immunity but raises static current.

Does MP6400DJ-30-LF-Z support monitoring voltages below 3.0V?

No - MP6400DJ-30-LF-Z is a fixed-threshold variant set to 3.0V. To monitor voltages below 3.0V (e.g., 1.8V or 0.9V), use MP6400DJ-01 (adjustable down to 0.4V) or MP6400DJ-09 (0.9V). The "30" suffix in the part number specifically denotes 3.0V nominal threshold per the Ordering Information table.

What is the maximum allowable voltage on the SENSE pin?

The SENSE pin supports up to 6V absolute maximum, as stated in the Absolute Maximum Ratings table. However, for reliable threshold detection, the applied voltage must be within the device's operating range and match the factory-set 3.0V trip point - overvoltage beyond 6V risks permanent damage.

How does the MR pin behave when left unconnected?

When MR is left floating, its internal 90kΩ pull-up resistor pulls it to VCC, resulting in logic-high state - no reset assertion. This is confirmed in the Pin Functions description and Truth Table, and eliminates need for external pull-up in basic applications.