Monolithic Power Systems Inc. MP6400DJ-12-LF-P

Overview

MP6400DJ-12-LF-P from Monolithic Power Systems is a low-quiescent-current (1.6 µA typ), programmable-delay supervisory circuit in TSOT23-6 package, with factory-set 1.2 V threshold (V_IT = 1.12 V), ±1% threshold accuracy, and user-selectable reset delay from 2.1 ms to 10 s via external capacitor on CDELAY pin-designed for reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the MP6400DJ-12-LF-P datasheet, MP6400DJ-12-LF-P pinout, MP6400DJ-12-LF-P application, or MP6400DJ-12-LF-P equivalent, key selection criteria include guaranteed reset validity down to V_CC = 0.8 V, open-drain RESET output compatible with 6 V pull-up, manual reset (MR) input with internal 90 kΩ pull-up, and immunity to ≤17.5 µs negative SENSE transients.

Technical Context

The MP6400DJ-12-LF-P implements a precision voltage monitoring architecture with hysteresis (1.5–3.5% of V_IT) to prevent chatter during supply ramping. Its internal 140 nA current source charges an external capacitor on CDELAY to generate programmable delay, with RESET de-assertion triggered at 1.13 V capacitor voltage.

It features dual reset initiation paths: SENSE voltage falling below 1.12 V (±1% accuracy) or MR pulled low (V_IL ≤ 0.25×V_CC). The open-drain RESET output supports rail-to-rail pull-up (up to 6 V), and operates reliably across V_CC = 1.8–6 V with guaranteed functionality down to 0.8 V.

Key Specifications

Pinout & Package

MP6400DJ-12-LF-P is housed in a 6-pin TSOT23 package (2.9 mm × 1.6 mm × 1.0 mm height), RoHS-compliant and lead-free, with exposed pad not connected internally. Pin 1 is bottom-left when reading top marking "AC" left-to-right.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVR and MAX6326L12D2T, MP6400DJ-12-LF-P uniquely combines manual reset input, capacitor-programmable delay (2.1 ms–10 s), and open-drain RESET-enabling flexible sequencing and interoperability in multi-rail embedded systems where both reliability and design adaptability are critical.

Availability

MP6400DJ-12-LF-P is available at Aetrix Electronics and suitable for battery-powered wearables, FPGA configuration sequencing, industrial PLC I/O modules, and medical sensor nodes requiring stable component supply with full lifecycle support.

Supply support for MP6400DJ-12-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6400 product line delivers ultra-low-power, precision voltage supervision for resource-constrained embedded systems-targeting applications where extended battery life, robust brown-out response, and flexible reset timing are essential.

FAQ

What is the exact V_IT threshold for MP6400DJ-12-LF-P?

The MP6400DJ-12-LF-P has a factory-set threshold voltage (V_IT) of 1.12 V, corresponding to a nominal monitored rail of 1.2 V, with ±1% accuracy over temperature and supply voltage. This value is laser-trimmed during production and does not require external calibration.

Can the reset delay be set to exactly 500 ms?

Yes-500 ms is achievable by connecting a 10 nF capacitor between CDELAY and GND. Per the datasheet equation, t_D ≈ (4.99 × 10⁻⁴ × C_DELAY) seconds, yielding ~499 ms with 10 nF; actual delay varies ±20% due to capacitor tolerance and stray capacitance, so 1% NP0/C0G ceramic is recommended.

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

Yes-an external pull-up resistor ≥10 kΩ is mandatory because RESET is open-drain. The resistor connects between RESET and the target logic rail (e.g., 3.3 V or 5 V). Pull-up voltage may exceed V_CC up to 6 V, enabling level translation in mixed-voltage systems.

Does MP6400DJ-12-LF-P support monitoring voltages below 1.2 V?

No-MP6400DJ-12-LF-P is factory-configured for 1.2 V nominal rail monitoring (V_IT = 1.12 V). To monitor voltages <1.2 V (e.g., 0.8 V), use MP6400DJ-01, which supports adjustable thresholds down to 0.4 V via external resistor divider on SENSE.

What happens if V_CC drops below 0.8 V?

Below 0.8 V, RESET behavior is undefined per datasheet specification. However, the device guarantees valid RESET assertion down to 0.8 V, meaning it will hold RESET active until V_CC recovers above that level-critical for controlled shutdown in brown-out scenarios.

How is the MR pin used in practice?

The MR pin provides a logic-level manual reset path: driving it ≤0.25×V_CC asserts RESET immediately, independent of SENSE voltage. Its internal 90 kΩ pull-up allows direct connection to a microcontroller GPIO configured as open-drain or push-pull, eliminating external components in most cases.