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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Monolithic Power Systems Inc. MP4001DS-LF-Z

Name: MP4001DS-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP4001DS-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4001DS-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MP4001DS-LF-Z.pdf

Description:: IC LED DRIVER OFFL PWM 8SOIC

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Product details

Overview

MP4001DS-LF-Z from Monolithic Power Systems is a universal-input (85–305V_AC) constant-current LED driver IC that implements boundary conduction mode (BCM) control to drive external high-voltage MOSFETs for non-isolated buck LED strings. It delivers 350mA LED current with 300mV CS reference voltage, supports both PWM and DC burst dimming, and integrates a smart high-voltage LDO enabling direct AC-line startup. It targets cost-sensitive, high-efficiency general illumination designs.

For engineers reviewing the MP4001DS-LF-Z datasheet, MP4001DS-LF-Z pinout, MP4001DS-LF-Z application, or MP4001DS-LF-Z equivalent, key selection criteria include its 110kHz max switching frequency limit, hiccup-mode short-circuit protection, -40°C to +125°C operating junction temperature, SOIC8 package thermal resistance (θ_JA = 96°C/W), and 300mV current-sense threshold enabling low-loss regulation.

Technical Context

The MP4001 operates in boundary conduction mode using valley-switching detection at the DRIVE pin to achieve zero-current turn-on of the external MOSFET-eliminating reverse-recovery loss in the freewheeling diode and minimizing inductor size. Its internal smart LDO activates only when input voltage falls below 24V, reducing quiescent dissipation while maintaining stable 8.5–9.8V VCC regulation.

LED current is regulated via peak-current control using an external sense resistor and the 300mV CS reference; dimming is implemented either by analog DC voltage (0–2.42V) on DIM with BOS capacitor programming, or by external 100Hz–2kHz PWM signals. Protection includes UVLO (7.25V rising / 6.25V falling), thermal shutdown (150°C trip), and output short-circuit hiccup (1.7ms off-time).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	85–305V_AC RMS or 12–450V_DC: Enables direct universal mains connection without auxiliary winding or transformer.
CS Reference Voltage	300mV ±10%: Sets LED current as I_LED = 300mV / R_sense; enables low-power, high-accuracy current sensing.
Max Switching Frequency	110kHz: Limits EMI and MOSFET switching loss while ensuring operation remains in BCM under full-load conditions.
VCC Regulation	8.5–9.8V sawtooth (smart LDO active) or fixed 8.5V (low-VIN fallback): Ensures robust gate drive capability across wide input range.
Dimming Interface	PWM (100Hz–2kHz) or DC analog (0–2.42V): Supports both digital and analog brightness control without external DAC or MCU.
Protection Features	Hiccup short-circuit (1.7ms off), thermal shutdown (150°C), UVLO (7.25V/6.25V), max off-time limit: Prevents thermal runaway and ensures safe fault recovery.
Operating Junction Temp	–40°C to +125°C: Validated for industrial and outdoor lighting environments with extended thermal cycling.

Pinout & Package

MP4001DS-LF-Z is housed in a standard SOIC8 (Small Outline Integrated Circuit, 8-pin) package with exposed pad not present; JEDEC MS-012 AA compliant, 1.27mm pitch, 3.9mm × 4.9mm body size, θ_JA = 96°C/W on 1"² 1oz copper.

Pin/Terminal	Circuit Role	Design Meaning
1 - DRIVE	High-side gate driver output	Drives external N-channel MOSFET; also senses zero-current crossing via dv/dt at Q1 drain for valley switching.
2 - CS	Current sense input	Accepts voltage drop across external sense resistor; 300mV reference sets precise LED current regulation.
3 - BOS	Burst oscillator timing node	Connects to GND via capacitor to set DC burst dimming frequency; or to GND via 300kΩ for PWM logic reference.
4 - GND	Analog and power ground	Common return for CS, DIM, BOS, and internal regulator; must be low-impedance and star-connected.
5 - DIM	Dimming control input	Accepts 0–2.42V DC for linear burst duty control, or 100Hz–2kHz PWM for digital dimming; open or pulled high disables dimming.
6 - IN	High-voltage input supply	Receives rectified AC or DC input up to 500V; powers internal smart LDO and enables direct line-powered startup.
7 - VCC	Internal regulated supply	Provides 8.5–9.8V bias for logic and gate drive; requires local 22µF ceramic bypass capacitor.
8 - VS	Test pin	Must be connected to GND for normal operation; unused in production circuits.

Key Features

Feature	Design Value
Boundary Conduction Mode (BCM)	Eliminates diode reverse-recovery loss and enables zero-current MOSFET turn-on-reducing heat and allowing higher f_SW with smaller magnetics.
Smart High-Voltage LDO	Activates only below 24V input to minimize quiescent loss; maintains stable VCC for gate drive integrity across universal AC range.
300mV Current Sense Threshold	Reduces I²R loss in sense resistor by >50% vs. typical 1V references-improving system efficiency and thermal margin.
Hiccup Short-Circuit Protection	Shuts down for 1.7ms then retries-prevents sustained overcurrent while enabling automatic recovery if fault clears.
Integrated Zero-Current Detection	Uses DRIVE pin dv/dt sensing (not auxiliary winding) to detect inductor current zero-crossing-simplifying layout and lowering BOM count.

Applications

General Illumination

Industrial Lighting

Use Scenario: Indoor ceiling and wall-mounted LED luminaires powered directly from 120/230V AC mains.

IC Role / Device Role / Timing Role: Constant-current buck controller regulating 350mA through 3–9 series white LEDs in non-isolated topology.

Use Value: Eliminates need for isolated flyback or auxiliary bias winding-reducing component count, cost, and board space by ~30%.

Use Scenario: High-bay LED fixtures in warehouses and factories with wide ambient temperature swings (–25°C to +60°C).

IC Role / Device Role / Timing Role: Primary LED current regulator with thermal shutdown (150°C) and –40°C to +125°C operation envelope.

Use Value: Maintains stable light output and reliability across extreme thermal cycles without derating or forced cooling.

Decorative LED Lighting

LCD TV Backlighting

Use Scenario: Architectural accent lighting and signage using flexible LED strips driven from AC mains.

IC Role / Device Role / Timing Role: Dimmable LED driver supporting both trailing-edge TRIAC-compatible DC burst dimming and PWM inputs.

Use Value: Enables smooth 5–100% brightness control with no audible noise or flicker-compatible with legacy wall dimmers.

Use Scenario: Edge-lit LCD TV backlight modules requiring compact, efficient, and EMI-compliant LED drivers.

IC Role / Device Role / Timing Role: High-frequency (≤110kHz) BCM controller minimizing inductor size and conducted EMI in tight chassis layouts.

Use Value: Meets CISPR-22 Class B EMI limits without additional filtering-reducing bill-of-materials and PCB area.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP4002DS-LF-Z	Same architecture but optimized for lower LED current (200mA typ.), lower VCC UVLO (6.0V), and reduced gate drive strength (300mA sink).	Better suited for low-power indicator or signage LEDs where thermal headroom is constrained.	Select MP4002 if total LED string power < 8W and board space is limited-avoid for >350mA loads.
LYTSwitch-6 (LNK3696P)	Integrated primary-side switched-mode controller with transformer isolation, 750V MOSFET, and ±3% LED current accuracy.	Required where safety isolation (EN61347, UL8750) or high-voltage creepage is mandated-adds transformer and optocoupler.	Choose LYTSwitch-6 only when regulatory certification demands reinforced isolation; MP4001 offers 40% lower BOM cost in non-isolated cases.

Compared with MP4002DS-LF-Z, the MP4001DS-LF-Z delivers higher peak gate drive (1.2A sink) and supports 350mA LED current out-of-box, making it optimal for mainstream general lighting. Versus LYTSwitch-6, it eliminates isolation components but requires careful layout for EMI and creepage-ideal for cost-driven, non-certified indoor fixtures.

Availability

MP4001DS-LF-Z is available at Aetrix Electronics and suitable for general illumination, industrial lighting, decorative LED systems, and LCD TV backlighting requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP4001DS-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, and global manufacturing partnerships.

The MP4001 belongs to MPS's universal-input LED driver product line, engineered specifically for cost-sensitive, non-isolated AC/DC LED lighting applications where efficiency, simplicity, and dimming flexibility are prioritized over safety isolation.

FAQ

What is the minimum recommended VCC bypass capacitor value for MP4001DS-LF-Z?

A 22µF/16V X7R ceramic capacitor is recommended per the datasheet design example. This value ensures VCC remains above the 6.25V UVLO threshold during worst-case line dips and switching transients, especially when the smart LDO is active between 14–24V input. Smaller values risk intermittent shutdown; larger values add cost and board area without benefit.

Can MP4001DS-LF-Z drive more than 9 LEDs in series?

No-datasheet specifications and typical application examples limit operation to 3–9 white LEDs (10–30V total forward voltage). Exceeding 30V output risks violating the internal voltage ratings of the CS comparator and compromising current regulation accuracy. For higher-V_f strings, use a cascaded or SEPIC topology with a different controller.

Does MP4001DS-LF-Z require an external freewheeling diode?

Yes-an ultra-fast or super-fast recovery diode (e.g., 600V/1A) is mandatory in the buck path. The IC does not integrate a diode; its valley-switching operation relies on detecting zero current through this external diode. Standard PN diodes cause excessive reverse-recovery loss and thermal failure under BCM operation.

How is the burst dimming frequency set on MP4001DS-LF-Z?

By connecting a capacitor (C_BOS) from the BOS pin to GND. Frequency is calculated as f_DIM = I_BOS / (V_BOSH × C_BOS), where I_BOS = 4µA (typ) and V_BOSH = 2.42V (typ). For example, a 1nF capacitor yields ~1.65kHz burst frequency. Values outside 100Hz–5kHz may cause audible noise or dimming nonlinearity.

Is MP4001DS-LF-Z compatible with TRIAC dimmers?

Not directly-it lacks leading-edge phase-cut interface circuitry. However, it supports DC burst dimming with 0–2.42V analog input, which can be driven by the output of a TRIAC-dimmer-compatible controller (e.g., using a bridge rectifier + RC filter + op-amp buffer). Standalone TRIAC compatibility requires external dimmer interface ICs like the MOC3021.

What is the purpose of the VS pin on MP4001DS-LF-Z?

The VS (Voltage Sense) pin is a test-only terminal used internally during wafer probe and final test. It must be connected to GND in all production designs. Leaving it floating or applying voltage may cause undefined behavior or latch-up; no external components should be attached to this pin.

Does MP4001DS-LF-Z support constant-voltage (CV) output mode?

No-it is a dedicated constant-current (CC) LED driver with no CV regulation loop or feedback pin for voltage sensing. Its CS pin only monitors current via a shunt resistor. Attempting CV operation will result in unregulated output voltage and potential LED overcurrent if load impedance changes.

MP4001DS-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: AC DC Offline Switcher

Topology:: Step-Down (Buck)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 12V

Voltage - Supply (Max):: 450V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 110kHz

Dimming:: PWM

Applications:: Backlight, Lighting

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MP4001DS-LF-Z FAQ

1.How can I place an order for MP4001DS-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4001DS-LF-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP4001DS-LF-Z reliable?

The price and inventory of MP4001DS-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4001DS-LF-Z is usually 5 days.

3.What payment methods are accepted for MP4001DS-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4001DS-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4001DS-LF-Z?

MP4001DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4001DS-LF-Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP4001DS-LF-Z?

For technical support, including MP4001DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4001DS-LF-Z requirements.

6.How does Aetrix verify that MP4001DS-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP4001DS-LF-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP4001DS-LF-Z meets industry standards.

7.What is the process for return or replacement of MP4001DS-LF-Z?

All MP4001DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4001DS-LF-Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP4001DS-LF-Z part is unused and in its original packaging.

Return procedure for MP4001DS-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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