Monolithic Power Systems Inc. MP62171ES-LF

Overview

MP62171ES-LF from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch designed for USB VBUS and 5V load switching. It delivers 1.5A continuous current with 75mΩ R_DS(on), operates from 2.7V to 5.5V input, features thermal shutdown at 140°C, and includes open-drain FLAG output with 8ms deglitch for reliable fault reporting in portable power rails.

For engineers reviewing the MP62171ES-LF datasheet, MP62171ES-LF pinout, MP62171ES-LF application, or MP62171ES-LF equivalent, key selection criteria include guaranteed 1.5A current limit accuracy, reverse current blocking, under-voltage lockout (1.95V rising threshold), and SOIC8 package compatibility with USB hot-swap and portable device power sequencing requirements.

Technical Context

The MP62171ES-LF integrates a low-R_DS(on) N-channel MOSFET with precision current-sense amplifier and thermal monitoring circuitry. Its constant-current limiting activates at ≥2.5A trip (typical), transitioning smoothly from linear regulation to current clamp without latch-up.

It employs an internal charge pump to drive the high-side switch gate, enabling full enhancement across the 2.7–5.5V input range. The FLAG pin asserts low after 8ms deglitched overcurrent or thermal fault detection, eliminating external RC filtering while rejecting transient noise during power-up.

Key Specifications

Pinout & Package

MP62171ES-LF is housed in an 8-pin SOIC package (5.0mm × 6.2mm, 1.27mm pitch) with no exposed pad. Pin functions are electrically validated per MPS Rev.0.9 datasheet and confirmed on official Monolithic Power Systems product page.

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, MP62171ES-LF uniquely combines reverse current blocking, 8ms hardware-deglitched FLAG, and guaranteed 1.5A current limit in a RoHS-compliant SOIC8 package-making it optimal for USB and portable electronics requiring robust, plug-and-play fault management.

Availability

MP62171ES-LF is available at Aetrix Electronics and suitable for USB power distribution, portable device subsystem control, and telecom hot-swap applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP62171ES-LF 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 MP6217x series belongs to MPS's power distribution switch product line, engineered specifically for fault-protected, low-R_DS(on) load switching in space-constrained portable and computing platforms.

FAQ

What is the maximum allowable continuous current for MP62171ES-LF at 85°C ambient?

The MP62171ES-LF is rated for 1.5A continuous current across –20°C to +85°C ambient temperature. At TA = +85°C in SOIC8 package, thermal derating is not required due to its 1.4W power dissipation rating and 90°C/W θ_JA, maintaining full 1.5A capability with proper PCB copper area.

Does MP62171ES-LF require an external pull-up resistor on the FLAG pin?

Yes-FLAG is an open-drain output and must be pulled up externally (typically 4.7kΩ to 5V) to generate a valid logic-high signal when no fault is present. The internal structure does not include a pull-up, and operation without one results in undefined FLAG state.

Can MP62171ES-LF be used with a 3.3V input supply?

Yes-its 2.7V to 5.5V input range fully supports 3.3V rails. At VIN = 3.3V, R_DS(on) increases slightly (≤130mΩ), resulting in ≤195mV dropout at 1.5A, which remains within typical 3.3V system margin requirements.

How does the 8ms FLAG deglitch function interact with thermal shutdown events?

The 8ms deglitch applies only to overcurrent detection; thermal shutdown asserts FLAG immediately without deglitch delay. This ensures rapid response to die overheating while maintaining noise immunity for current-related transients like capacitor inrush.

Is reverse current blocking active when the device is disabled (EN = low)?

Yes-reverse current blocking is inherent to the internal MOSFET structure and remains active regardless of EN state. When disabled, the body diode is reverse-biased, preventing current flow from OUT to IN even with V_OUT > V_IN.

What is the turn-off time specification, and how is it measured?

Turn-off time (T_off) is 10ms maximum, measured from 50% EN falling edge to 10% V_OUT level with CL = 100µF and RL = 5.5Ω. This parameter defines the speed of safe power removal during fault or shutdown sequences.

Does MP62171ES-LF support I²C or other digital interfaces?

No-MP62171ES-LF is an analog power switch with only digital enable (EN) and open-drain flag (FLAG) signals. It has no serial interface, programmable registers, or configurable thresholds; all behavior is fixed per silicon design.