Monolithic Power Systems Inc. MP62171ES-LF-P

Overview

MP62171ES-LF-P from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch optimized 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 over-current detection in portable USB power rails.

For engineers reviewing the MP62171ES-LF-P datasheet, MP62171ES-LF-P pinout, MP62171ES-LF-P application, or MP62171ES-LF-P equivalent, key selection criteria include guaranteed 1.5A current limit (typ. 2.3A short-circuit trip), reverse current blocking, under-voltage lockout (1.95V rising threshold), and SOIC8 package compatibility with industrial temperature range (–20°C to +85°C).

Technical Context

The MP62171ES-LF-P integrates a low-R_DS(on) N-channel MOSFET with precision current-sense amplifier and charge-pump gate driver to maintain constant-current regulation during overload. Its UVLO circuit prevents operation below 1.95V, while thermal sensing triggers shutdown at 140°C with 20°C hysteresis to ensure safe recovery.

FLAG output uses an internal 8ms deglitch timer to suppress transient faults, reporting only sustained over-current events; it remains un-deglitched during UVLO or thermal shutdown to provide immediate fault visibility. EN logic is TTL/CMOS-compatible with 2V high-threshold and 0.8V low-threshold.

Key Specifications

Pinout & Package

MP62171ES-LF-P is housed in an 8-pin SOIC package (body size 4.90mm × 3.90mm, 1.27mm pitch) with no exposed pad. Pin functions are validated per MPS Rev.0.9 datasheet and match SOIC8 mechanical standard JEDEC MS-012, Variation AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR and NCP45520MUTBG, MP62171ES-LF-P uniquely combines reverse current blocking, deglitched FLAG, and thermal shutdown with hysteresis-making it optimal for USB-compliant, fault-resilient 5V load switching where system-level diagnostics and backfeed prevention are mandatory.

Availability

MP62171ES-LF-P is available at Aetrix Electronics and suitable for USB power distribution, portable GPS device power sequencing, and notebook PC card slot protection requiring stable component supply across industrial temperature ranges and long-term production cycles.

Supply support for MP62171ES-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, headquartered in California and serving global power management markets since 1997.

The MP6217x series belongs to MPS's load switch product line, designed specifically for robust, low-footprint current-limited power distribution in portable and interface-constrained applications such as USB, PCMCIA, and embedded peripheral rails.

FAQ

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

The MP62171ES-LF-P guarantees 1.5A continuous current across –20°C to +85°C ambient. At TA = +85°C in SOIC8 package, thermal derating is not required due to its 1.4W PD(max) rating and 90°C/W θJA, allowing full 1.5A operation with typical PCB copper area.

Does MP62171ES-LF-P support reverse current blocking when disabled?

Yes - MP62171ES-LF-P integrates reverse current blocking functionality. When EN is low and VOUT > VIN, the internal MOSFET body diode is actively blocked, preventing backflow from output to input. This is confirmed in the "Detailed Description" and electrical characteristics table (reverse leakage <0.2µA).

How does the FLAG pin behave during thermal shutdown versus over-current events?

FLAG asserts low after 8ms deglitch timeout for both over-current and thermal shutdown events. However, during UVLO or initial power-up, FLAG remains high (undriven) without deglitching - providing immediate visibility of supply faults while suppressing transients during normal enable sequences.

Can MP62171ES-LF-P be used with 3.3V logic control signals?

Yes - the EN pin accepts TTL/CMOS logic with VIH(min) = 2.0V and VIL(max) = 0.8V. A 3.3V microcontroller GPIO meets these thresholds with margin, and the 90µA quiescent current ensures minimal loading on logic drivers.

What is the purpose of the 8ms FLAG deglitch time, and can it be adjusted?

The 8ms deglitch time filters out brief current spikes (e.g., capacitive inrush) to prevent false fault reporting. It is fixed by internal circuitry and not user-adjustable; no external components are needed - this eliminates design complexity versus solutions requiring RC networks.

Is MP62171ES-LF-P RoHS compliant and halogen-free?

Yes - the "-LF" suffix denotes lead-free and RoHS-compliant packaging. Per MPS documentation, MP62171ES-LF-P meets JEDEC J-STD-020 moisture sensitivity level 1 and is halogen-free per IEC 61249-2-21.

How does under-voltage lockout (UVLO) interact with EN activation?

UVLO takes precedence over EN: if VIN falls below 1.95V (rising edge), the device remains disabled even if EN is high. Once VIN exceeds the UVLO threshold, EN then controls switching. This ensures stable gate drive and prevents partial turn-on during brown-out conditions.