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

Monolithic Power Systems Inc. MP4651ES-LF-P

Name: MP4651ES-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP4651ES-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4651ES-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: MP4651ES-LF-P.pdf

Description:: NRFND:FOR NEW DESIGNS,RECOMMEND

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP4651ES-LF-P from Monolithic Power Systems is a fixed-frequency off-line LED driver IC for isolated high-power LED applications, featuring dual 180° phase-shifted gate drivers (GL/GR), 9V enhanced gate drive capability, 50kHz typical operating frequency, 0.6V LED current feedback reference, and integrated burst/PWM dimming control with synchronization support.

For engineers reviewing the MP4651ES-LF-P datasheet, MP4651ES-LF-P pinout, MP4651ES-LF-P application, or MP4651ES-LF-P equivalent, this device is selected for high-contrast LED backlighting where precise fault management, fast PWM dimming response, and external MOSFET gate driving via transformer coupling are required.

Technical Context

The MP4651ES-LF-P implements a fixed-frequency PWM controller with internal oscillator set by FSET (25kΩ → 50kHz) and burst dimming generator controlled via BFS resistor-capacitor network or external SYNC signal. It uses dual complementary gate outputs (GL/GR) to drive external power stages in interleaved configuration.

Fault protection is implemented through three independent comparators: OVP (2.38V threshold, 7µs delay), SSD (2.36V low-detect), and FB-based short-string detection (1.2V high-detect), all triggering a unified fault state that disables GL/GR, pulls down PWMOUT, and initiates recovery via FT capacitor charging by 8µA current source.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	46.5–53.5 kHz (set by 25kΩ FSET-to-GND resistor); determines switching loss and magnetics size in flyback/LLC LED drivers.
Gate Driver Output	9.7V VCC output (±1V), 1A source / 2A sink capability; directly drives gate transformer primary without external buffer.
LED Current Regulation	0.6V FB reference voltage (±0.03V); enables accurate current sensing with shunt resistor at LED cathode.
Burst Dimming Control	DC input range 0–1.2V on PWMIN sets 0–100% burst duty cycle; supports external PWM sync up to 120% of BFS-set frequency.
Fault Detection Thresholds	OVP = 2.38V (7µs delay), SSD = 2.36V (7µs), FB short = 1.2V (7µs); ensures robust open/short LED condition handling.
Supply Input Range	9V to 30V VIN; powers internal regulator and supports wide-input industrial LED power supplies.
Thermal Resistance	θJA = 80°C/W (SOIC16); defines maximum continuous power dissipation (2.5W at TA=25°C) before thermal shutdown.

Pinout & Package

MP4651ES-LF-P is housed in a 16-pin SOIC package (JEDEC MS-012 AC compliant) with exposed pad not present; pin 1 marked by notch or dot, body dimensions 9.80 × 3.94 mm, lead pitch 1.27 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 OVP	Over-voltage sense input	Monitors LED string anode via divider; triggers fault if >2.38V for ≥7µs - prevents overvoltage stress on LEDs.
2 SYNC	Burst dimming synchronizing input	Accepts narrow-pulse sync signal (>1.4V, >6µs width); aligns BFS triangle waveform to external timing source.
3 SSD	Short-string detection input	Detects LED string short via voltage drop; fault triggered if <2.36V for ≥7µs - protects MOSFETs from excessive current.
4 FB	LED current feedback input	Senses cathode-side shunt voltage; regulates average to 0.6V; also serves as secondary short-string detector (>1.2V).
5 COMP	Compensation node	Connects integrator capacitor (1–47nF X7R) to ground; stabilizes current loop and enables fast PWM dimming hold/release.
6 FT	Fault timer capacitor connection	Charged by 8µA current; recovery occurs when voltage reaches 2.38V - sets system restart delay (e.g., 10nF ≈ 3ms).
7 PWMOUT	PWM dimming signal output	Drives external series MOSFET gate; logic-high = LED on; pulled low during fault - enables flicker-free high-contrast dimming.
8 FSET	Frequency set input	Resistor-to-GND sets oscillator frequency (R = 1.25×10⁹/f_O); 25kΩ yields 50kHz nominal operation.
9 BFS	Burst frequency set node	R-C network programs burst oscillator; for external PWM dimming, pull up to VCC via 20kΩ and apply logic signal to PWMIN.
10 PWMIN	Burst brightness control input	0–1.2V DC controls burst duty cycle linearly; logic-level PWM accepted when BFS is pulled high - supports both analog/digital dimming.
11 EN	Enable/disable control	High (>2V) enables IC; low (<1V) disables all outputs and reduces quiescent current to 1µA - enables system-level power sequencing.
12 VIN	Main supply input	9–30V input powering internal LDO; requires local 0.1µF ceramic bypass near pin - defines operating voltage envelope.
13 VCC	Internal LDO output & gate driver supply	9.7V ±1V regulated output sourcing 20mA; powers gate drivers and external circuitry; requires ≥1µF ceramic bypass.
14 GL	Gate driver output A	180° phase-shifted complementary drive signal; directly drives transformer primary; 2A sink/1A source capability.
15 GND	Power and signal ground	Common return for VIN, VCC, FB, COMP, FT, and logic circuits - must be low-impedance plane for stable regulation.
16 GR	Gate driver output B	180° phase-shifted complementary drive signal to GL; identical drive strength; enables interleaved power stage operation.

Key Features

Feature	Design Value
Dual-phase gate drivers	GL and GR outputs provide 180° phase shift with 9.7V rail and 2A sink capability - enables interleaved transformer-driven topologies reducing EMI and ripple.
Fast PWM dimming architecture	PWMOUT signal and COMP node disconnection during off-cycle eliminate loop settling delay - achieves sub-millisecond dimming response and >10,000:1 contrast ratio.
Multi-mode burst dimming	Supports DC voltage-controlled (0–1.2V), externally synchronized, or direct logic-level PWM input - simplifies integration into MCU-, FPGA-, or ASIC-based lighting controllers.
Triple-fault detection with auto-recovery	OVP, SSD, and FB-based short-string detection feed into unified fault state; FT capacitor enables programmable restart delay (e.g., 3ms with 10nF) - improves system reliability.
Integrated 9V gate driver supply	VCC pin delivers regulated 9.7V/20mA output - eliminates need for external bias supply and supports direct gate transformer drive without level-shifting.

Applications

LCD TV Backlighting

LCD Monitor Backlighting

Use Scenario: High-brightness edge-lit or direct-lit LED arrays in 32–85 inch LCD TVs requiring flicker-free dimming across 100–10,000 nits.

IC Role / Device Role / Timing Role: Off-line LED driver controlling two interleaved flyback stages; GL/GR drive external MOSFETs via gate transformer; PWMOUT synchronizes dimming MOSFETs.

Use Value: Dual-phase drive reduces output current ripple by >70%, enabling smaller bulk capacitors; fast PWM dimming eliminates visible scanning artifacts at low brightness.

Use Scenario: Slim-profile monitors with uniform direct-lit LED backlights needing precise current matching and thermal derating under ambient temperature variation.

IC Role / Device Role / Timing Role: Primary LED current controller with FB-regulated 0.6V reference; OVP/SSD/FB fault detection ensures safe operation during LED aging or partial failure.

Use Value: Triple-fault coverage prevents catastrophic failure during long-term operation; built-in VCC LDO simplifies auxiliary supply design and improves startup reliability.

Flat Panel Video Displays

Commercial LED Lighting

Use Scenario: Large-format digital signage displays using high-power white LED modules with dynamic content-driven brightness modulation.

IC Role / Device Role / Timing Role: Burst dimming controller with SYNC input aligned to video frame rate; PWMIN accepts MCU-generated dimming commands; BFS sets base burst frequency.

Use Value: External SYNC alignment eliminates beat interference between display refresh and LED dimming, preventing visible banding or shimmer in static images.

Use Scenario: Industrial-grade LED luminaires operating in 0–50°C ambient with requirement for overvoltage protection during line surges and short-circuit tolerance during maintenance.

IC Role / Device Role / Timing Role: Isolated LED driver managing constant-current output in flyback topology; EN pin enables remote on/off control; FT timer provides graceful recovery after fault events.

Use Value: Programmable fault recovery delay avoids repeated cycling during transient overloads; SOIC16 package supports automated assembly and meets IPC Class 2 reliability standards.

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP4652ES-LF-Z	Higher VCC output (10.5V), extended frequency range (20–200kHz), added soft-start; same SOIC16 footprint and pinout.	Preferred for higher-power designs (>100W) requiring faster gate drive and wider frequency tuning to optimize magnetics.	Select MP4652 when gate drive margin or frequency flexibility is critical; MP4651 remains optimal for cost-sensitive 30–80W backlight systems.
LM3445MM/NOPB	Single-channel controller, no dual-phase outputs; lower gate drive (7.5V), no SYNC input; uses external MOSFET for dimming instead of PWMOUT.	Suitable for simpler single-stage LED drivers without interleaving or synchronized burst dimming requirements.	Choose LM3445 only for non-interleaved, lower-cost designs where dual-phase drive and high-contrast PWM are not needed.

Compared with MP4652ES-LF-Z, the MP4651ES-LF-P offers tighter cost control and sufficient gate drive for standard 50–75W backlighting, while differing from LM3445MM/NOPB by integrating dual-phase control, dedicated PWMOUT, and full synchronization - making it uniquely suited for high-fidelity display dimming.

Availability

MP4651ES-LF-P is available at Aetrix Electronics and suitable for LCD TV backlighting, flat-panel video displays, commercial LED lighting, and industrial monitor applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP4651ES-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, with core expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP4651 belongs to MPS's off-line LED driver product line, designed specifically for high-efficiency, isolated, high-power LED backlighting in consumer and professional displays where reliability, dimming fidelity, and fault resilience are critical.

FAQ

What is the recommended minimum value for the FSET resistor to ensure stable 50kHz operation?

The MP4651ES-LF-P datasheet specifies a 25kΩ resistor from FSET to GND for typical 50kHz operation. Using a resistor below 20kΩ risks exceeding the maximum 150kHz operating frequency limit and may cause instability in the gate driver timing loop due to oscillator gain margin reduction.

Can the MP4651ES-LF-P drive GaN MOSFETs directly without a gate transformer?

No - the MP4651ES-LF-P's GL and GR outputs are designed for transformer-coupled drive to achieve isolation and voltage level shifting. Its 9.7V VCC rail and 2A sink capability are optimized for Si MOSFET gate transformers, not direct GaN gate driving, which typically requires negative turn-off voltage and faster slew rates beyond this IC's specification.

How does the COMP pin disconnection during PWM dimming improve dimming speed?

During PWMOFF intervals, the MP4651ES-LF-P disconnects the COMP capacitor from the error amplifier, holding its voltage. This eliminates recharging delay when PWMON resumes, allowing immediate current regulation recovery - achieving <10µs dimming transition time versus >100µs in conventional architectures.

What is the maximum allowable voltage on the SYNC pin, and what happens if exceeded?

The SYNC pin absolute maximum rating is +6.5V. Exceeding this - even briefly - risks permanent damage to the internal synchronizing comparator. The recommended high-level input is 1.4V minimum, with pulse width 6–20µs; sustained >3.3V violates the "Other Pins" rating and may degrade latch-up immunity.

Is the FT capacitor value standardized, or must it be calculated per application?

The FT capacitor must be calculated: T_delay ≈ C_FT × 2.38V / 8µA. For example, a 10nF capacitor yields ~3ms recovery delay. Selecting too small a value causes premature restart under persistent faults; too large delays system response unnecessarily - design must match expected fault duration.

Does the MP4651ES-LF-P support analog dimming via the FB pin?

No - FB is strictly a current-sense feedback input regulated to 0.6V. Analog dimming is not supported; brightness control is exclusively via DC voltage (0–1.2V) or logic-level PWM on PWMIN, or external SYNC-triggered burst modulation - all implemented digitally within the IC's control loop.

What is the purpose of the 5Ω resistors recommended in series with GL and GR outputs?

These resistors damp gate-drive ringing caused by parasitic inductance in transformer windings and PCB traces. They reduce EMI emissions and prevent false triggering of external MOSFETs' Miller capacitance, improving system robustness without compromising rise/fall times under typical load conditions.

MP4651ES-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MP

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Type:: AC DC Offline Switcher

Topology:: Flyback

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 9V

Voltage - Supply (Max):: 30V

Voltage - Output:: -

Current - Output / Channel:: 2A

Frequency:: 50kHz

Dimming:: PWM

Applications:: Lighting

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

MP4651ES-LF-P FAQ

1.How can I place an order for MP4651ES-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4651ES-LF-P 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 MP4651ES-LF-P reliable?

The price and inventory of MP4651ES-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4651ES-LF-P is usually 5 days.

3.What payment methods are accepted for MP4651ES-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4651ES-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4651ES-LF-P?

MP4651ES-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4651ES-LF-P 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 MP4651ES-LF-P?

For technical support, including MP4651ES-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4651ES-LF-P requirements.

6.How does Aetrix verify that MP4651ES-LF-P is sourced from the original manufacturer or authorized distributors?

All MP4651ES-LF-P 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 MP4651ES-LF-P meets industry standards.

7.What is the process for return or replacement of MP4651ES-LF-P?

All MP4651ES-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4651ES-LF-P, 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 MP4651ES-LF-P part is unused and in its original packaging.

Return procedure for MP4651ES-LF-P:

1.Submit a request within 90 days.

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

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