Monolithic Power Systems Inc. MP4001DS-LF-P

Overview

MP4001DS-LF-P from Monolithic Power Systems is a universal-input (85–305V_AC) constant-current LED driver IC operating in boundary conduction mode (BCM), delivering 350mA LED current with 300mV CS reference voltage, 110kHz max switching frequency, and integrated high-voltage smart LDO for direct AC-line powering. It drives external MOSFETs in non-isolated buck topology for industrial lighting and LCD TV backlighting.

For engineers reviewing the MP4001DS-LF-P datasheet, MP4001DS-LF-P pinout, MP4001DS-LF-P application, or MP4001DS-LF-P equivalent, key selection criteria include its 500V input rating, zero-current turn-on capability, hiccup short-circuit protection, thermal shutdown at 150°C, and SOIC8 package compatibility with universal AC input LED systems requiring high efficiency and compact magnetics.

Technical Context

The MP4001DS-LF-P implements valley-switching BCM control via zero-current detection at the DRIVE pin using dV/dt sensing across the MOSFET's Miller capacitance, enabling soft turn-on and eliminating diode reverse recovery loss. Its internal smart LDO activates only when IN voltage falls below 24V, reducing quiescent dissipation while maintaining VCC regulation between 8.5V and 9.8V.

LED current is regulated by peak current sensing through an external resistor at the CS pin with a precise 300mV threshold, and dimming is supported via either DC voltage-controlled burst mode (0–2.42V on DIM) or external PWM (100Hz–2kHz). Protection includes UVLO (7.25V rising, 6.25V falling), overtemperature shutdown (150°C/120°C hysteresis), and output short-circuit hiccup (1.7ms off-time).

Key Specifications

Pinout & Package

MP4001DS-LF-P is housed in a standard SOIC8 package (5.0mm × 6.2mm, 1.27mm pitch) with exposed pad not electrically connected. Pin functions are validated per Monolithic Power Systems Rev. 1.02 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with MP4001DS-LF-P, MP4002DS-LF-Z trades 100V input margin for tighter DC-input optimization, while LYT6079C replaces external MOSFET control with integrated isolation-making MP4001 the optimal choice for non-isolated, high-efficiency, universal-input LED drivers where component count and thermal performance are prioritized.

Availability

MP4001DS-LF-P is available at Aetrix Electronics and suitable for industrial lighting, LCD TV backlighting, automotive decorative lighting, and general illumination retrofit lamps requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP4001DS-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 Kirkland, WA, with global design and support operations.

The MP4001 belongs to MPS's universal-input LED driver product line, engineered specifically for non-isolated, high-efficiency, high-brightness white LED applications where compact size, wide input range, and robust protection are critical.

FAQ

What is the maximum AC input voltage the MP4001DS-LF-P supports?

The MP4001DS-LF-P supports universal AC input up to 305V_RMS, with absolute maximum IN pin rating of 500V. This allows direct connection to 277VAC commercial lighting circuits and 305VAC industrial lines without external voltage clamping, provided proper PCB creepage/clearance is maintained per IEC61347.

Can the MP4001DS-LF-P operate without an external MOSFET?

No. The MP4001DS-LF-P is a controller-only IC and requires an external high-voltage N-channel MOSFET (e.g., 600V, 2.4A rated) to switch the buck inductor. It does not integrate a power switch-unlike some competing LED drivers-and relies on the DRIVE pin to drive the gate with 400mA source/1.2A sink capability.

How is LED current accuracy affected by temperature?

CS pin reference voltage is specified as 270–330mV over –40°C to +85°C, yielding ±10% variation. Combined with resistor tolerance and layout parasitics, total LED current drift remains within ±15% across full junction temperature range, verified in typical applications with 350mA output and 10–30V LED strings.

What is the purpose of the VS pin, and can it be left floating?

The VS pin is a test terminal used during wafer probe and final test; it has no functional role in normal operation. Per datasheet Section 4, VS must be connected to GND in production designs. Leaving it floating may cause undefined behavior or latch-up due to internal node coupling.

Does the MP4001DS-LF-P support analog (0–10V) dimming?

No. The DIM pin accepts only DC voltage levels (0–2.42V) for burst dimming or logic-level PWM signals (100Hz–2kHz). True 0–10V analog dimming requires an external voltage-to-PWM converter or resistor divider network to scale 10V down to ≤2.42V, as exceeding 2.42V disables dimming control.

What is the minimum recommended VCC capacitor value?

A 10µF–22µF X7R ceramic capacitor rated ≥16V is recommended. Smaller values risk VCC droop below UVLO (6.25V) during low-line conditions or high-frequency switching, causing intermittent shutdown. The datasheet specifies 22µF for universal input designs with 350mA output and 60kHz nominal frequency.

Is the MP4001DS-LF-P compliant with IEC61000-4-5 surge immunity standards?

The MP4001DS-LF-P itself is not certified to IEC61000-4-5, but the reference design achieves 2kV line-earth and 1kV line-line surge immunity when paired with a full-wave bridge, MOV, and properly rated input capacitors. Layout practices-including minimizing loop area on IN/VCC paths-are essential to meet Class B EMI and surge requirements.