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Monolithic Power Systems Inc. MP4651ES-LF
- Part No.:
- MP4651ES-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4651ES-LF.pdf
- Description:
- IC LED DRIVER OFFL PWM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
MP4651ES-LF from Monolithic Power Systems is a fixed-frequency off-line LED driver IC designed for high-power isolated LED backlighting systems. It delivers two 180° phase-shifted gate drive outputs (GL/GR), features a 9V enhanced gate driver, supports DC or PWM input dimming control, and integrates open/short LED, overvoltage, and overtemperature protection with auto-recovery via an external FT capacitor. It is used in LCD TV and flat-panel display power stages.
For engineers reviewing the MP4651ES-LF datasheet, MP4651ES-LF pinout, MP4651ES-LF application, or MP4651ES-LF equivalent, key selection criteria include its 50kHz typical operating frequency, 0.6V LED current feedback reference, burst dimming synchronization capability via SYNC pin, and SOIC16 package compatibility with isolated flyback/LLC LED drivers.
Technical Context
The MP4651ES-LF implements a fixed-frequency PWM controller with internal oscillator set by FSET (25kΩ → 50kHz) and burst-mode dimming controlled independently via BFS/PWMIN. Its dual-phase gate drivers (GL/GR) are optimized for driving external MOSFETs or gate-drive transformers in isolated topologies.
Fault management uses dedicated comparators on OVP (2.38V threshold), SSD (2.36V), and FB (1.2V short-string detection), each with 7µs delay filtering. Recovery is timed by an 8µA current source charging the FT capacitor to 2.38V, enabling precise system reset timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 46.5–53.5 kHz (set by 25kΩ FSET-to-GND resistor); ensures stable EMI profile and transformer sizing for 100W+ LED backlights. |
| LED Current Feedback Reference | 0.57–0.63 V (typ. 0.6 V); enables accurate constant-current regulation of LED strings using low-value sense resistors. |
| Burst Dimming Control Range | 0–100% duty cycle (via 0–1.2 V DC at PWMIN); provides linear digital brightness scaling without analog signal noise sensitivity. |
| Gate Driver Output Capability | 1 A source / 2 A sink (GL/GR pins); directly drives gate-drive transformers or high-Ciss MOSFETs in high-side/low-side configurations. |
| OVP/SSD Fault Threshold | 2.22–2.55 V (OVP), 2.22–2.55 V (SSD); tightly matched thresholds enable robust open/short LED detection across temperature and process variation. |
| VCC Regulator Output | 8.7–10.5 V (no load); supplies bias for internal logic and external gate drivers while supporting up to 20 mA load. |
| Fault Timer Charging Current | 8 µA (FT pin); allows precise recovery delay tuning (e.g., 10 nF → ~3 ms) for fault-hold-and-reset behavior in safety-critical lighting. |
Pinout & Package
MP4651ES-LF is housed in a standard SOIC16 (Small Outline Integrated Circuit, 16-pin) package with 1.27 mm pitch, JEDEC MS-012 AC compliant, and rated for -20°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OVP | Overvoltage Protection Input | Monitors LED string voltage via divider; triggers fault if >2.38 V for 7 µs - prevents overvoltage stress on LEDs and secondary components. |
| 2 SYNC | Burst Dimming Synchronization Input | Accepts narrow-pulse sync signal (>1.4 V, >6 µs width); aligns internal burst oscillator to external timing source (e.g., system MCU or video frame sync). |
| 3 SSD | Short String Detection Input | Detects low-voltage LED string faults (<2.36 V for 7 µs); complements FB-based short detection for redundant safety in multi-string designs. |
| 4 FB | LED Current Feedback Input | Senses cathode-side shunt voltage; regulates average current to 0.6 V reference; also serves as secondary short-string detector (>1.2 V). |
| 5 COMP | Compensation Node | Connects to error amplifier output; external RC network here sets loop stability for LED current regulation bandwidth and transient response. |
| 6 FT | Fault Timer Timing Terminal | Charged by 8 µA current; reaches 2.38 V to auto-recover after fault - enables programmable hold time before retry (e.g., 3 ms with 10 nF). |
| 7 PWMOUT | PWM Dimming Signal Output | Drives external dimming MOSFET; logic-high = LED ON; pulled low during fault - ensures fail-safe dimming path disconnection. |
| 8 FSET | Frequency Set Input | Resistor-to-GND sets oscillator frequency (25 kΩ → 50 kHz); defines primary switching speed for magnetics and efficiency optimization. |
| 9 BFS | Burst Frequency Set Terminal | R+C network programs burst dimming frequency (e.g., 212 kΩ + 52 nF → 200 Hz); alternative mode accepts external PWM when pulled to VCC. |
| 10 PWMIN | Burst Brightness Control Input | 0–1.2 V DC sets burst duty cycle linearly; or accepts logic-level PWM for direct digital dimming - supports both analog and microcontroller control. |
| 11 EN | Enable Input | 2 V turn-on / 1 V turn-off threshold; internal 60 kΩ pull-down allows simple microcontroller or optocoupler interface for system-level on/off control. |
| 12 VIN | Main Supply Input | 9–30 V DC input range; powers internal regulator and logic; requires local 0.1 µF ceramic bypass near pin for noise immunity. |
| 13 VCC | Internal Regulator Output | 9.7 V ±1 V regulated supply; powers gate drivers and external circuitry; requires ≥1 µF ceramic bypass for stability under dynamic load. |
| 14 GL | Gate Drive Output A | 180° phase-shifted complementary drive signal; 1 A source / 2 A sink capability enables direct transformer or MOSFET gate driving in half-bridge configurations. |
| 15 GND | Power Ground | Primary return path for VIN, VCC, and internal logic; must be low-impedance and separated from high-dI/dt gate return paths to minimize noise coupling. |
| 16 GR | Gate Drive Output B | Complementary 180° phase-shifted signal to GL; identical drive strength and timing; enables balanced power stage operation and reduced EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced 9V Gate Driver | Delivers 1 A source / 2 A sink per GL/GR output - sufficient to drive high-Ciss MOSFETs or gate-drive transformers without external buffers. |
| Programmable Fixed-Frequency PWM | 46.5–53.5 kHz operation set by single FSET resistor - simplifies EMI filter design and enables predictable transformer core loss modeling. |
| DC or PWM Burst Dimming Control | Supports either 0–1.2 V analog voltage or logic-level PWM at PWMIN - eliminates need for external DAC or PWM generator in MCU-based systems. |
| Synchronized Burst Dimming | SYNC pin accepts external timing pulses to lock burst frequency - critical for flicker-free operation in video-synchronized backlight dimming (e.g., HDMI/DisplayPort). |
| Smart Fault Management | Independent OVP, SSD, and FB-based fault detection with 7 µs deglitching and auto-recovery timer - reduces false trips and improves system reliability. |
| SOIC16 Package | Industry-standard 16-pin SOIC footprint with 1.27 mm pitch - enables drop-in replacement in existing LED driver PCB layouts and supports automated assembly. |
Applications
| LCD TV Backlight | LCD Monitor Power Stage |
|---|---|
|
Use Scenario: High-efficiency, flicker-free backlight for 32–65 inch LCD TVs with local dimming zones. IC Role / Device Role / Timing Role: Primary PWM controller generating phase-shifted GL/GR signals to drive isolated flyback or LLC converters powering multiple LED strings. Use Value: 50 kHz fixed frequency enables compact magnetics; synchronized burst dimming aligns with video frame rate to eliminate visible scanning artifacts. |
Use Scenario: Constant-current LED driver for commercial-grade 24–32 inch monitors requiring tight brightness uniformity and thermal stability. IC Role / Device Role / Timing Role: Off-line LED driver IC regulating current via FB pin while managing open/short LED faults and enabling fast PWM dimming via PWMOUT. Use Value: 0.6 V feedback reference minimizes sense resistor power loss; built-in fault timer ensures graceful recovery without MCU intervention. |
| Flat Panel Video Displays | Commercial LED Lighting Systems |
|
Use Scenario: Large-format digital signage displays requiring high-brightness, long-lifetime LED arrays with robust fault handling. IC Role / Device Role / Timing Role: Dual-phase gate driver controlling external MOSFETs in resonant converter topologies; manages burst dimming via BFS/PWMIN. Use Value: 9 V gate drive sustains MOSFET switching under high junction temperature; SSD/OVP redundancy prevents single-point failure in mission-critical signage. |
Use Scenario: Industrial LED lighting fixtures operating in wide ambient temperature ranges (-20°C to +85°C) with surge-prone AC inputs. IC Role / Device Role / Timing Role: Isolated LED driver IC providing constant-current regulation, overvoltage protection, and thermal shutdown with auto-restart. Use Value: FT pin programmability allows tailored fault-hold time (e.g., 10 ms) to avoid nuisance tripping during line transients while ensuring safety compliance. |
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 | Higher VCC output (12 V vs. 9.7 V), extended input range (12–36 V), same SOIC16 package and pinout. | Better suited for 24 V industrial LED systems; not recommended for 12 V input designs due to higher minimum VIN. | Select MP4652ES-LF only when input exceeds 24 V or external gate drivers require >10 V bias. |
| UCC28810DR | Fixed-frequency flyback controller with integrated 600 V MOSFET; no external gate drivers; different topology focus. | Targets lower-power non-isolated or integrated MOSFET designs; lacks dual-phase outputs and burst dimming sync capability. | Choose UCC28810DR for cost-sensitive <50 W designs where integration outweighs flexibility; MP4651ES-LF remains superior for >100 W isolated systems. |
Compared with MP4652ES-LF, MP4651ES-LF offers tighter 9–30 V input compatibility and lower VCC overhead for gate-drive transformers, while UCC28810DR trades external drive flexibility for monolithic simplicity - making MP4651ES-LF optimal for scalable, high-reliability LED backlight platforms.
Availability
MP4651ES-LF is available at Aetrix Electronics and suitable for LCD TV backlighting, flat-panel display power stages, commercial LED lighting systems, and industrial signage requiring stable component supply and long-term production continuity.
Supply support for MP4651ES-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 mixed-signal ICs for power management, LED lighting, and motor control applications.
The MP4651 belongs to MPS's off-line LED driver product line, engineered specifically for high-power isolated backlighting systems requiring precise current regulation, robust fault protection, and synchronized digital dimming.
FAQ
What is the minimum input voltage required for MP4651ES-LF startup?
The MP4651ES-LF requires a minimum 9 V DC input to initiate regulation and enable the internal VCC regulator. Below this threshold, the device remains in undervoltage lockout (UVLO) and disables all outputs. Startup occurs at approximately 9.5 V with hysteresis, and stable operation is guaranteed from 9 V to 30 V per datasheet specifications.
How does the MP4651ES-LF achieve flicker-free PWM dimming?
It achieves flicker-free dimming through three coordinated mechanisms: (1) precise timing alignment between PWMOUT and GL/GR gate signals, (2) immediate compensation network hold during PWM off-time via COMP pin disconnect, and (3) synchronized burst frequency locking to external video timing via the SYNC pin - eliminating phase drift and frame-rate mismatch artifacts.
Can MP4651ES-LF drive MOSFETs directly without a gate-drive transformer?
Yes - its 9 V enhanced gate driver delivers 1 A source and 2 A sink current, sufficient to drive medium-power discrete MOSFETs (e.g., ≤5 nC gate charge, ≤100 V VDS) in low-side or half-bridge configurations. For high-side or high-Ciss MOSFETs in isolated topologies, a gate-drive transformer is still recommended for level-shifting and noise isolation.
What is the purpose of the FT pin, and how is its timing calculated?
The FT pin connects to an external capacitor that sets the fault recovery delay. An internal 8 µA current source charges the capacitor until it reaches 2.38 V, at which point the IC exits fault mode. Timing is calculated as t = (2.38 V × C) / 8 µA; for example, a 10 nF capacitor yields ~3 ms recovery time, allowing safe cooldown before retry.
Does MP4651ES-LF support both analog and digital dimming simultaneously?
No - it supports either DC voltage-controlled burst dimming (0–1.2 V at PWMIN) or external logic-level PWM input at the same pin, but not simultaneous analog + digital control. The mode is selected by the BFS pin configuration: R+C network enables DC mode; pull-up to VCC enables external PWM mode - mutually exclusive per design.
What is the maximum allowable continuous power dissipation for MP4651ES-LF in SOIC16?
At TA = +25°C, the maximum continuous power dissipation is 2.5 W, based on θJA = 80°C/W and TJ(MAX) = 150°C. Derating is required above +25°C ambient: PD(MAX) = (150°C − TA) / 80°C/W. Thermal shutdown activates if junction temperature exceeds 125°C (recommended max operating TJ), protecting against permanent damage.
How is overvoltage protection triggered, and what happens during OVP fault?
OVP triggers when voltage at Pin 1 (OVP) exceeds 2.38 V for ≥7 µs - typically from LED string open-circuit or feedback divider failure. Upon trigger, GL/GR outputs disable, PWMOUT pulls low, COMP discharges at 30 µA, and the FT timer starts. Recovery occurs only after FT capacitor charges to 2.38 V, ensuring full system reset before restart.
MP4651ES-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Half-Bridge
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 50kHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP4651ES-LF FAQ
1.How can I place an order for MP4651ES-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4651ES-LF 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 reliable?
The price and inventory of MP4651ES-LF 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 is usually 5 days.
3.What payment methods are accepted for MP4651ES-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4651ES-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4651ES-LF?
MP4651ES-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4651ES-LF 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?
For technical support, including MP4651ES-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4651ES-LF requirements.
6.How does Aetrix verify that MP4651ES-LF is sourced from the original manufacturer or authorized distributors?
All MP4651ES-LF 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 meets industry standards.
7.What is the process for return or replacement of MP4651ES-LF?
All MP4651ES-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP4651ES-LF, 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 part is unused and in its original packaging.
Return procedure for MP4651ES-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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