Monolithic Power Systems Inc. MP6212DN-LF-Z

Overview

MP6212DN-LF-Z from Monolithic Power Systems is an active-low single-channel 1A current-limited power distribution switch with 90mΩ R_DS(on), 2.7V–5.5V input range, and thermal shutdown protection. It serves as a protected USB VBUS power switch in portable electronics, limiting fault current to 1.5A typical during short circuits while maintaining reverse current blocking and 8ms FLAG deglitching.

For engineers reviewing the MP6212DN-LF-Z datasheet, MP6212DN-LF-Z pinout, MP6212DN-LF-Z application, or MP6212DN-LF-Z equivalent, key selection criteria include its active-low enable logic, SOIC8E exposed-pad thermal performance, guaranteed 1A continuous load rating, and integrated UVLO (2.65V rising threshold) for stable USB 5V rail switching.

Technical Context

The MP6212DN-LF-Z integrates a low-R_DS(on) N-channel MOSFET with precision current-sense amplifier and charge-pump gate driver, enabling fast turn-on (3ms) and controlled constant-current limiting at 1.5A typical. Its internal thermal sensor triggers shutdown at 140°C with 20°C hysteresis, ensuring safe recovery below 120°C.

It features an open-drain FLAG output with 8ms deglitch timeout-immune to power-up glitches-and under-voltage lockout that disables operation below 1.95V. The device supports reverse current blocking and operates with only 90μA quiescent current when enabled.

Key Specifications

Pinout & Package

The MP6212DN-LF-Z is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), requiring solder connection of the pad to PCB ground plane for optimal thermal dissipation (θ_JA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power distribution switch applications.

Compared with TPS22965DRLR and NCP45520MUTBG, the MP6212DN-LF-Z uniquely combines active-low logic, reverse current blocking, and deglitched FLAG in SOIC8E-enabling robust, self-contained USB port protection without auxiliary components.

Availability

MP6212DN-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, portable GPS devices, notebook PC subsystems, and set-top box USB hub protection requiring stable component supply and full lifecycle support.

Supply support for MP6212DN-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 MP6211/MP6212 product line targets compact, thermally constrained portable systems requiring reliable, integrated power-switch protection-emphasizing low R_DS(on), precise current limiting, and autonomous fault handling without host intervention.

FAQ

What is the maximum input voltage the MP6212DN-LF-Z can tolerate?

The MP6212DN-LF-Z has an absolute maximum IN voltage rating of +6.0V. Operation above 5.5V violates recommended operating conditions and risks permanent damage-even briefly. Designers must ensure input rail transients (e.g., USB hot-swap spikes) remain below this limit using appropriate clamping or filtering.

Does the MP6212DN-LF-Z require an external pull-up resistor on the FLAG pin?

Yes-the FLAG pin is open-drain and requires an external pull-up resistor (typically 10kΩ to 5V or 3.3V) to generate a valid logic-high signal during normal operation. Without it, FLAG remains floating and cannot indicate fault-free status reliably.

How does the MP6212DN-LF-Z behave during a sustained short circuit?

Upon short detection, it enters constant-current mode at ~1.5A, causing junction heating. If thermal shutdown triggers at 140°C, the switch turns off completely. It automatically recovers only after die temperature falls below 120°C-no external reset is needed.

Can the MP6212DN-LF-Z be used with 3.3V logic-level microcontrollers?

Yes-the EN input accepts TTL/CMOS logic levels: ≤0.8V guarantees disable, ≥2.0V guarantees enable. A 3.3V GPIO can directly drive EN without level-shifting, as its high-state margin (3.3V > 2.0V) and low-state margin (0V < 0.8V) meet specifications.

Is the exposed thermal pad electrically isolated from other pins?

No-the exposed pad is internally connected to GND (Pin 1). It must be soldered to a PCB ground plane for both thermal performance and electrical integrity. Leaving it unconnected degrades θ_JA by >30% and risks thermal runaway under 1A load.

What is the purpose of the 8ms FLAG deglitch time?

The 8ms deglitch timer prevents false fault reporting from brief current spikes (e.g., capacitor inrush or ESD). Only overcurrent events lasting ≥8ms assert FLAG low-ensuring reliable fault detection without software or external hardware filtering.

Does the MP6212DN-LF-Z support hot-plug insertion into live USB ports?

Yes-its reverse current blocking (0.2μA leakage) and UVLO prevent backfeed and erratic behavior during hot insertion. However, designers must still limit inrush via output capacitance (≤100μF recommended) to avoid exceeding the 1.5A trip threshold during initial charge.