Monolithic Power Systems Inc. MP6211DH-LF-Z

Overview

MP6211DH-LF-Z from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch with 1A continuous load capability, 90mΩ R_DS(ON), and integrated thermal shutdown and under-voltage lockout. It operates from 2.7V to 5.5V input and delivers precise 1.5A short-circuit trip current for USB port power management in portable electronics.

For engineers reviewing the MP6211DH-LF-Z datasheet, MP6211DH-LF-Z pinout, MP6211DH-LF-Z application, or MP6211DH-LF-Z equivalent, key selection criteria include guaranteed current limit accuracy (±20% over temperature), 8ms FLAG deglitch timing, reverse current blocking, SOIC8E exposed-pad thermal performance, and active-high EN logic compatibility with 5V/3.3V host controllers.

Technical Context

The MP6211DH-LF-Z integrates a low-R_DS(ON) N-channel MOSFET with internal current-sense amplifier and precision voltage reference to enforce constant-current limiting at 1.5A (typ.) during overload. Its deglitched open-drain FLAG pin asserts after 8ms of sustained overcurrent, eliminating external RC filtering.

Thermal protection activates at 140°C junction temperature with 20°C hysteresis, forcing automatic shutdown until die cools to ~120°C. Under-voltage lockout disables operation below 1.95V (rising edge) to prevent erratic switching during brownout conditions.

Key Specifications

Pinout & Package

The MP6211DH-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 on 4-layer JEDEC board).

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 NIS5132MN, the MP6211DH-LF-Z uniquely combines guaranteed thermal shutdown, reverse current blocking, and 8ms deglitched FLAG in a single SOIC8E package-enabling robust, self-protecting USB and portable load switching without supplemental circuitry.

Availability

MP6211DH-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, portable device subsystem control, and notebook auxiliary rail management requiring stable component supply, RoHS-compliant packaging, and UL recognition (E322138).

Supply support for MP6211DH-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 series belongs to MPS's power distribution switch product line, engineered specifically for reliable, current-limited load switching in space-constrained portable and USB-powered systems.

FAQ

What is the maximum allowable input voltage for MP6211DH-LF-Z?

The absolute maximum input voltage is +6.0V, but the recommended operating range is 2.7V to 5.5V. Exceeding 5.5V may trigger internal protection or cause irreversible damage, even briefly. The device is optimized for 3.3V and 5V rails, such as USB VBUS or notebook auxiliary supplies.

Does MP6211DH-LF-Z support reverse current blocking when disabled?

Yes. When the EN pin is deasserted, the internal MOSFET blocks reverse current flow from OUT to IN, with typical reverse leakage of only 0.2μA at 5.5V. This prevents back-powering of upstream sources-a critical feature in multi-rail portable systems where isolated subsystems share common grounds.

How does the FLAG pin behave during thermal shutdown versus overcurrent events?

The FLAG pin asserts low after 8ms of sustained overcurrent, but responds immediately (no deglitch) during thermal shutdown or UVLO activation. This dual-mode behavior allows system firmware to distinguish between transient overload (deglitched) and catastrophic failure (instantaneous), enabling differentiated recovery strategies.

Can MP6211DH-LF-Z drive a 1000μF output capacitor safely?

Yes-the device supports up to 1000μF output capacitance with controlled inrush. Typical turn-on time increases to ~10ms with 1000μF (vs. 3ms at 100μF), but the internal slew-rate limiting prevents excessive peak current. A 10μF minimum input capacitor is still required to stabilize the IN rail during switching.

Is the exposed pad electrically connected internally?

Yes-the exposed pad is internally connected to GND and serves as the primary thermal and electrical ground path. It must be soldered to a dedicated PCB ground plane with multiple thermal vias (minimum 4×0.3mm) to achieve rated 2.5W power dissipation and maintain θ_JA ≤ 50°C/W per JEDEC MS-012BA guidelines.

What is the minimum EN pulse width required for reliable turn-on?

A minimum EN high pulse width of 1μs is sufficient for reliable activation. The input is CMOS/TTL-compatible with 2V logic-high threshold, and internal filtering rejects sub-microsecond noise. No external debouncing is needed, even in noisy automotive or industrial environments.

Does MP6211DH-LF-Z require external components for basic operation?

No external components are required for core functionality. Only two recommended passives are needed: a ≥10μF ceramic capacitor from IN to GND (for transient suppression) and a pull-down resistor on FLAG (if interfacing with a microcontroller input). All protection, deglitching, and current sensing are fully integrated.