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Monolithic Power Systems Inc. MP4601EF-LF
- Part No.:
- MP4601EF-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP4601EF-LF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
MP4601EF-LF from Monolithic Power Systems is a current-mode buck-boost white LED driver IC designed for large-size LCD TV backlighting, supporting up to 100 LEDs in series with output voltage up to 350V. It operates with dual input rails (VINL = 12V, VINH up to 236V), delivers regulated LED current via 200mV FB reference, achieves up to 99.5% efficiency, and integrates a 0.5Ω internal MOSFET switch.
For engineers reviewing the MP4601EF-LF datasheet, MP4601EF-LF pinout, MP4601EF-LF application, or MP4601EF-LF equivalent, key selection considerations include its novel power leverage control architecture, programmable cycle-by-cycle overcurrent protection (2.5A default), 1:1000+ dimming ratio via combined PWM/analog dimming, and fault signaling via open-drain FAULT pin referenced to INGND.
Technical Context
The MP4601EF-LF implements peak current-mode control with programmable slope compensation (1.2 V/µs default) to ensure stability at duty cycles >50%. Its power leverage topology regulates only a small portion of the total LED string voltage using a fixed high-voltage bus (VINH), enabling efficient high-power operation with low-voltage stress on internal components.
It supports dual dimming modes: PWM dimming (100Hz–50kHz) and analog dimming (0.7–1.5V on DIM pin), with combined use achieving >1:1000 dimming ratio. Protection features include LED open detection (via OVP pin threshold at 1.2V), LED short latch-off (triggered at FB ≥600mV or ≥300mV for 480µs), thermal shutdown at 150°C, and cycle-by-cycle current limiting set by ROCP resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost regulator with patented power leverage control for high-voltage LED strings |
| Max LED String Voltage | Up to 350V - enables driving 60-inch+ LCD TV backlights with 100-series LEDs |
| FB Reference Voltage | 200 mV ±5% - sets precise LED current via external sense resistor (e.g., RFB = 2Ω → ILED = 100 mA) |
| Internal Switch RDS(on) | 0.5 Ω - reduces conduction loss and thermal load in high-current backlight applications |
| Dimming Ratio | >1:1000 - achieved via synchronized PWM + analog dimming, critical for HDR TV contrast control |
| Switching Frequency | 0.8–1.2 MHz (default 0.95 MHz) - enables compact magnetics and low EMI with small passive components |
| Quiescent Current | 850 µA - minimizes standby power in always-on TV systems |
| Shutdown Current | 10 µA - supports ultra-low-power off-state for energy compliance |
Pinout & Package
MP4601EF-LF is packaged in TSSOP16-EP (exposed pad) with thermal performance θJA = 45°C/W and θJC = 10°C/W, optimized for high-power LED driver thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Low-voltage input rail (12V) | Supplies bias and gate drive; requires local decoupling to suppress switching noise |
| INGND | Input ground reference | Reference for EN, DIM, SYN signals; must be isolated from noisy power ground paths |
| EN | Enable control input | Active-high logic (1.7V threshold); enables full system power sequencing in TV mainboard designs |
| DIM | Combined PWM/analog dimming input | Accepts 0.7–1.5V analog signal or 100Hz–50kHz PWM for dynamic backlight control |
| FB | Current-sense feedback input | Regulates LED current to 200mV across external RFB; triggers short-circuit latch at ≥600mV |
| OVP | Overvoltage protection input | Programmable threshold (1.2V) to disable SW during LED open or overvoltage fault |
| FAULT | Open-drain fault indicator | Pulled low to INGND on LED short or latch condition; enables system-level fault reporting |
| SW | Internal MOSFET switch source | Connects to inductor and Schottky rectifier cathode; carries full LED current ripple |
| BST | Bootstrap supply node | Forms floating gate drive for internal high-side switch via external BST capacitor |
| DGD | External dimming switch gate driver | Sinks/sourcing up to 45mA to drive external MOSFET for additional dimming stages |
Key Features
| Feature | Design Value |
|---|---|
| Novel power leverage control | Enables high-efficiency (>99.5%) regulation of 350V LED strings using only 12V bias rail and fixed high-voltage bus |
| Integrated 0.5Ω MOSFET | Reduces BOM count and PCB area vs. external switch solutions while maintaining thermal headroom in TSSOP16-EP |
| Programmable cycle-by-cycle OCP | ROCP resistor sets current limit from 1.1A to 4.1A - allows precise matching to LED string current requirements |
| Thermal shutdown with 20°C hysteresis | Prevents latch-up after overtemperature event; ensures safe auto-recovery in thermally constrained TV chassis |
| Open-drain FAULT output | Signals LED short/open faults to MCU or PMIC without level-shifting; compatible with 3.3V/5V logic domains |
| Slope compensation pin (SLOPE) | RSLOPE resistor sets compensation slope (0.39 V/µs default) - ensures stable current-mode control across all operating conditions |
Applications
| TV Backlight Control | Large Public Display Lighting |
|---|---|
Use Scenario: Driving 60–85 inch LCD panels in premium consumer TVs requiring local dimming zones and HDR support. IC Role / Device Role / Timing Role: Primary constant-current LED driver regulating up to 350V string voltage with synchronized PWM dimming at 200Hz. Use Value: Enables >1:1000 dimming ratio and 99.5% efficiency, reducing heat generation and power supply size in slim TV chassis. | Use Scenario: Backlighting commercial digital signage panels (e.g., 75-inch kiosks) operating 24/7 under ambient temperature extremes. IC Role / Device Role / Timing Role: High-reliability LED current controller with thermal shutdown (150°C) and LED open auto-recovery for unattended operation. Use Value: Maintains consistent brightness over lifetime via precise 200mV FB reference and robust OVP/short protection. |
| Professional Monitor Backlighting | Medical Imaging Display Illumination |
Use Scenario: Color-accurate backlight for graphic design monitors requiring flicker-free dimming and minimal grayscale banding. IC Role / Device Role / Timing Role: Analog + PWM dimming controller with <1.5V DIM input range, delivering smooth luminance transitions without current step artifacts. Use Value: Eliminates visible PWM strobing via combined dimming, meeting ISO 9241-305 flicker standards for professional viewing. | Use Scenario: Diagnostic-grade medical displays (e.g., PACS viewers) where backlight stability directly impacts clinical interpretation accuracy. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with FAULT pin reporting and LED short latch-off to prevent catastrophic failure during imaging sessions. Use Value: Ensures zero unexpected dimming events or blackouts via redundant protection (OVP, FB short detection, thermal shutdown). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4603 | Successor IC with improved efficiency (up to 99.7%), lower quiescent current (650µA), and extended VIN range (4.5–85V) | Recommended for new designs targeting higher reliability and lower standby power in next-gen TVs | Select MP4603 when designing new platforms; MP4601EF-LF remains viable for legacy production and cost-sensitive replacements |
| LM3409HV | High-voltage buck LED driver (75V max VIN), no integrated power FET, requires external MOSFET and separate dimming interface | Suitable for medium-power applications (<150V LED strings) where board space is less constrained | Choose LM3409HV only if existing layout supports external FET and higher component count is acceptable |
Compared with MP4603, MP4601EF-LF offers proven field reliability but higher quiescent current and narrower input voltage range; versus LM3409HV, it delivers higher integration and simpler layout at the cost of fixed topology - making it optimal for high-power, space-constrained TV backlight modules.
Availability
MP4601EF-LF is available at Aetrix Electronics and suitable for TV backlighting, large public display lighting, professional monitor illumination, and medical imaging display applications requiring stable component supply across long production lifecycles.
Supply support for MP4601EF-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 power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control.
The MP4601 belongs to MPS's high-voltage LED driver product line, engineered specifically for large-format LCD backlighting where efficiency, thermal density, and fault resilience are critical in consumer and professional display systems.
FAQ
What is the maximum LED string voltage supported by MP4601EF-LF?
The MP4601EF-LF supports LED string voltages up to 350V when used with an external high-voltage bus (VINH). This capability enables direct driving of 100-LED series strings typical in 60-inch and larger LCD TV backlights, eliminating the need for multiple cascaded drivers or complex boost architectures.
How does the power leverage control technology improve efficiency?
Power leverage control allows the MP4601EF-LF to regulate only a small fraction of the total LED string voltage using its 12V VINL rail, while leveraging a fixed high-voltage bus (VINH) for bulk power delivery. This reduces switching losses, lowers MOSFET voltage stress, and enables higher-frequency operation (up to 1.2MHz), resulting in up to 99.5% system efficiency and smaller passive components.
Can MP4601EF-LF operate without an external high-voltage bus?
No - the MP4601EF-LF requires both VINL (12V nominal) and VINH (external high-voltage bus, e.g., 180–236V) to function. VINL powers internal circuitry and gate drive, while VINH supplies the majority of LED string power. Omitting VINH prevents proper operation and may damage the IC due to excessive voltage stress on internal components.
What dimming methods does MP4601EF-LF support, and how are they implemented?
The MP4601EF-LF supports three dimming modes: analog dimming (0.7–1.5V on DIM pin), PWM dimming (100Hz–50kHz square wave), and combined analog+PWM for >1:1000 ratio. Analog dimming adjusts the internal 200mV FB reference linearly; PWM dimming toggles the error amplifier output; combined mode uses PWM amplitude modulation within the analog range for enhanced resolution.
What protection features are integrated into MP4601EF-LF?
MP4601EF-LF integrates LED open protection (via OVP pin), LED short protection (latch-off at FB ≥600mV or ≥300mV for 480µs), cycle-by-cycle overcurrent protection (programmable via ROCP), thermal shutdown (150°C with 20°C hysteresis), and output short-circuit protection. All faults assert the open-drain FAULT pin to INGND for system-level monitoring.
Is MP4601EF-LF pin-compatible with MP4603?
No - MP4601EF-LF and MP4603 are not pin-compatible. While both are high-voltage LED drivers from MPS, MP4603 uses a different pinout (e.g., relocated OVP and FAULT pins) and updated internal architecture. Migration requires PCB layout revision and firmware validation; MP4603 is recommended for new designs per MPS documentation.
What package variants are available for MP4601EF-LF?
MP4601EF-LF is available exclusively in the TSSOP16-EP (exposed pad) package, identified by top marking "MP4601EF". The exposed thermal pad enhances heat dissipation for high-power backlight applications. The SOIC16 variant (MP4601ES) is a separate part number and not RoHS-compliant in LF suffix form.
MP4601EF-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 75V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2.5A (Switch)
- Frequency:
- 280kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MP4601EF-LF FAQ
1.How can I place an order for MP4601EF-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4601EF-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 MP4601EF-LF reliable?
The price and inventory of MP4601EF-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4601EF-LF is usually 5 days.
3.What payment methods are accepted for MP4601EF-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4601EF-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4601EF-LF?
MP4601EF-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4601EF-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 MP4601EF-LF?
For technical support, including MP4601EF-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4601EF-LF requirements.
6.How does Aetrix verify that MP4601EF-LF is sourced from the original manufacturer or authorized distributors?
All MP4601EF-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 MP4601EF-LF meets industry standards.
7.What is the process for return or replacement of MP4601EF-LF?
All MP4601EF-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP4601EF-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 MP4601EF-LF part is unused and in its original packaging.
Return procedure for MP4601EF-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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