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Monolithic Power Systems Inc. MP4603EF-LF
- Part No.:
- MP4603EF-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4603EF-LF.pdf
- Description:
- IC LED DRV RGLTR PWM 2.5A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
MP4603EF-LF from Monolithic Power Systems is a current-mode buck-boost white LED driver IC designed for large LCD TV backlight systems requiring up to 350V LED string voltage and 120mA output current. It integrates a 0.5Ω internal MOSFET, supports dual-input architecture (VINL = 12V + VINH ≤ 350V), delivers up to 99.5% efficiency, and enables >1:1000 dimming via combined PWM and analog control. It targets 60-inch+ LCD TV backlight power stages with fault-latched OVP, LED open/short protection, and thermal shutdown.
For engineers reviewing the MP4603EF-LF datasheet, MP4603EF-LF pinout, MP4603EF-LF application, or MP4603EF-LF equivalent, key selection criteria include its novel power-leverage-control topology, SOIC16 package with BST/SW/DGD pinout, ±5% 200mV FB reference, 10μA shutdown current, and compatibility with high-voltage LED strings driven from split-rail supplies.
Technical Context
The MP4603EF-LF implements peak-current-mode buck-boost regulation with programmable slope compensation (0.12–0.235 V/μs) and external frequency synchronization (0.1–2 MHz). Its dual-input architecture separates low-voltage control (12V) from high-voltage bias (up to 350V), enabling efficient high-string-voltage driving without high-side gate drivers.
It features integrated protection logic: LED open detection via FB undervoltage latching, short-circuit detection at 300mV (450μs delay) or 600mV immediate latch, and OVP triggered at 1.2V on the OVP pin. The FAULT pin provides open-drain status signaling referenced to INGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost regulator with internal 0.5Ω MOSFET - eliminates need for external high-voltage switch in LED string cathode drive path. |
| LED String Voltage Range | VINH to VINH+68V - supports 100-LED strings up to 350V total forward voltage using external high-voltage rail. |
| Feedback Reference | 200mV ±5% at FB pin - sets LED current via external sense resistor (e.g., 1.67Ω for 120mA). |
| Dimming Ratio | >1:1000 - achieved by combining PWM (100Hz–50kHz) and analog (0–1.2V) dimming inputs with internal COMP hold during PWM OFF. |
| Switching Frequency | 0.65–1.2MHz (FST-pin programmable) or 0.1–2MHz (SYN-synchronized) - enables compact magnetics and low EMI with high-frequency operation. |
| Thermal Protection | 150°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking in enclosed TV chassis. |
| Quiescent Current | 1.2mA typical - minimizes standby power loss in always-on TV backlight subsystems. |
Pinout & Package
MP4603EF-LF is housed in a RoHS-compliant SOIC16 package (5.8mm × 10.0mm, 1.27mm pitch) with exposed pad not specified for thermal enhancement per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FAULT | Open-drain fault indicator | Pulled to INGND on LED open/short or OVP; high-Z otherwise - enables system-level fault flagging without pull-up loading. |
| 2 VIN | Low-voltage input supply | Accepts 5–80V DC (typically 12V) - powers internal circuitry and bootstrap capacitor via BST-SW loop. |
| 3 INGND | Input ground reference | Separate from VSS; required return for FAULT, EN, PWM, ADIM, SYN - avoids noise coupling into sensitive analog feedback paths. |
| 4 SYN | Frequency sync input | Accepts 0.1–2MHz external clock or connects to other MP4603s for synchronized switching - reduces beat frequencies in multi-channel TV backlights. |
| 5 PWM | PWM dimming control | 100Hz–50kHz square wave; thresholds at 1.65V (OFF) and 2.2V (ON) - enables precise timing-controlled brightness modulation. |
| 6 EN | Enable input | Active-high enable with 0.9V (OFF) / 1.5V (ON) thresholds - supports microcontroller-based backlight sequencing and power-down control. |
| 7 ADIM | Analog dimming input | 0–1.2V linearly scales LED current from 0% to 100%; floating = full scale - allows smooth grayscale adjustment alongside PWM. |
| 8 FST | Frequency set terminal | Resistor-to-VSS sets fSW (0.65–1.2MHz); open = default 0.9MHz - simplifies EMI tuning without external oscillator. |
| 9 SLOPE | Slope compensation input | Resistor-to-VSS programs compensation (0.12–0.235 V/μs); open = 0.5 V/μs - ensures stable current-loop operation above 50% duty cycle. |
| 10 COMP | Error amplifier output | Connect ≥1nF capacitor to VSS for loop stability and soft-start - prevents inrush current during startup or dimming transitions. |
| 11 FB | Current sense feedback | Regulates voltage across external RFB to 200mV - defines LED current (ILED = 0.2V / RFB) with ±5% accuracy. |
| 12 OVP | Overvoltage protection input | Voltage divider sets latch-off threshold at 1.2V - protects LED strings and IC from overvoltage due to open-circuit or regulation failure. |
| 13 DGD | Dimming switch gate drive | Drives external MOSFET in series with LED string for ultra-deep dimming - complements internal switch for >1:1000 ratio. |
| 14 VSS | Negative output reference | Ground reference for FB, OVP, COMP, SLOPE, DGD, FST - forms return path for regulated negative output voltage. |
| 15 SW | Internal switch source | Connects to inductor and Schottky rectifier cathode - carries full LED current and switching ripple; requires low-inductance layout. |
| 16 BST | Bootstrap supply | Capacitor between BST and SW generates floating gate drive for internal high-side switch - enables buck-boost operation without external charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Power-leverage-control topology | Enables 350V LED string drive using only 12V control rail and separate high-voltage bias - reduces component count and improves power density vs. traditional boost-only drivers. |
| Dual dimming interface | Independent PWM and ADIM pins support simultaneous analog fine-tuning and digital coarse control - achieves >1:1000 dimming without external DAC or MCU firmware complexity. |
| Integrated protection suite | LED open latch, LED short (300mV/450μs & 600mV immediate), OVP (1.2V), thermal shutdown (150°C), and cycle-by-cycle current limit - eliminates need for discrete fault monitoring circuitry. |
| Programmable switching parameters | FST and SLOPE pins allow resistor-based tuning of fSW (0.65–1.2MHz) and slope compensation (0.12–0.235 V/μs) - optimizes efficiency and stability across varying LED string configurations. |
| Low quiescent power | 10μA shutdown current and 1.2mA operating IQ - meets stringent energy-efficiency requirements for modern TV standby modes (e.g., EU ErP Lot 6). |
Applications
| Large LCD TV Backlighting | High-Power Commercial Display Lighting |
|---|---|
Use Scenario: Driving 100-LED strings in 65-inch+ LCD TVs with split-rail supply (12V control + 150V bias). IC Role / Device Role / Timing Role: Buck-boost LED current regulator with integrated MOSFET, FB-based current sensing, and FAULT-latched protection. Use Value: Achieves 99.5% efficiency and >1:1000 dimming while eliminating external high-voltage switches - reduces BOM cost and PCB area in space-constrained TV chassis. | Use Scenario: Powering multi-string LED arrays in digital signage and retail display cabinets requiring uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: High-voltage LED string controller with synchronized switching (via SYN pin) and dual-dimming interface for consistent luminance across parallel channels. Use Value: Enables precise inter-channel brightness matching and EMI reduction through frequency synchronization - critical for seamless tiled-display video walls. |
| Industrial Panel Backlight Systems | Medical Imaging Display Illumination |
Use Scenario: Providing stable, dimmable backlight for ruggedized HMI panels used in factory automation with wide ambient temperature range (-20°C to +85°C). IC Role / Device Role / Timing Role: Fault-protected LED driver with thermal shutdown (150°C), LED open/short detection, and 10μA shutdown mode for low-power sleep states. Use Value: Ensures uninterrupted operation under thermal stress and mechanical vibration - eliminates field failures caused by LED string degradation or connector faults. | Use Scenario: Delivering flicker-free, precisely calibrated illumination for diagnostic-grade medical monitors where grayscale accuracy and zero temporal artifacts are mandatory. IC Role / Device Role / Timing Role: Analog + PWM dimming controller with ±5% 200mV FB reference and COMP hold function for sub-millisecond current settling. Use Value: Maintains DICOM Part 14 grayscale consistency across brightness levels - prevents diagnostic misinterpretation due to non-linear dimming response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4603-AEC1 | Automotive-grade variant with AEC-Q100 qualification, extended -40°C to +125°C junction temp, and enhanced ESD robustness (±8kV HBM). | Designed for automotive infotainment displays; includes additional watchdog and fault reporting features not present in MP4603EF-LF. | Select MPQ4603-AEC1 only when automotive qualification and extended temperature operation are mandatory - not drop-in compatible due to different pinout and enable logic. |
| LT3761EFE#PBF | Boost-only topology with external MOSFET, 60V max input, no integrated power switch, and 3.3V reference instead of 200mV. | Requires external high-side switch and higher-component-count design; lacks integrated OVP latch and FAULT pin functionality. | Choose LT3761EFE#PBF only if existing design uses boost architecture and needs higher input voltage tolerance - MP4603EF-LF offers superior integration and efficiency for buck-boost LED string topologies. |
Compared with MPQ4603-AEC1 and LT3761EFE#PBF, the MP4603EF-LF delivers higher integration (0.5Ω MOSFET, BST, FAULT), lower BOM cost, and optimized efficiency for large-panel LCD backlights - but lacks automotive qualification and requires split-rail supply implementation.
Availability
MP4603EF-LF is available at Aetrix Electronics and suitable for large LCD TV backlighting, commercial display lighting, industrial HMI panels, and medical imaging displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP4603EF-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 solutions.
The MP4603 belongs to MPS's high-voltage LED driver product line, engineered specifically for energy-efficient, high-brightness backlight systems in premium consumer displays - emphasizing power leverage, thermal resilience, and integrated protection.
FAQ
What is the maximum LED string voltage the MP4603EF-LF can drive?
The MP4603EF-LF supports LED string voltages from VINH to VINH+68V, with VINH up to 350V per datasheet - enabling direct drive of 100-LED strings (e.g., 3.5V per LED) in 60-inch+ LCD TVs. It does not regulate VINH; that rail must be supplied externally (e.g., from a flyback converter).
How does the MP4603EF-LF achieve >1:1000 dimming ratio?
It combines hardware PWM dimming (100Hz–50kHz, 1.65V/2.2V thresholds) with analog dimming (0–1.2V on ADIM pin) and internal COMP pin hold during PWM OFF intervals. This preserves error amplifier state for rapid current recovery, enabling deep dimming without visible steps or flicker.
What is the role of the INGND pin, and why is it separate from VSS?
INGND serves as the reference for digital control pins (EN, PWM, ADIM, SYN, FAULT) and isolates noise from the high-current VSS return path. This separation prevents switching transients on VSS from corrupting enable/dimming signals - critical for stable operation in noisy TV power environments.
Can the MP4603EF-LF operate without an external high-voltage rail (VINH)?
No. The MP4603EF-LF requires both VIN (low-voltage control, 5–80V) and VINH (high-voltage bias, up to 350V) to function. Its power-leverage architecture depends on VINH supplying most LED string voltage while the internal buck-boost stage regulates only the differential - omitting VINH disables LED string biasing.
What protection features are latched versus auto-recovering?
LED open, LED short (300mV/450μs or 600mV), and OVP (1.2V) trigger latched shutdown - requiring EN pin reset to restart. Thermal shutdown and cycle-by-cycle current limiting are auto-recovering; the device resumes normal operation once fault condition clears.
Is the SOIC16 package thermally enhanced?
No. The MP4603EF-LF SOIC16 package has no exposed thermal pad or heatsink tab per the official package drawing. Thermal performance relies on PCB copper area connected to VSS and VIN pins, with θJA = 80°C/W on a 4-layer JEDEC board - adequate for typical TV backlight power dissipation when properly laid out.
What is the minimum recommended input capacitance for stable operation?
A minimum 2.2μF X5R/X7R ceramic capacitor is recommended between VIN and VSS, placed adjacent to those pins. This value limits input ripple to <10% of VIN and suppresses high-frequency switching noise - insufficient capacitance causes VIN droop during peak current, triggering UVLO or instability.
MP4603EF-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:
- 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):
- 80V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2.5A (Switch)
- Frequency:
- 280kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP4603EF-LF FAQ
1.How can I place an order for MP4603EF-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4603EF-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 MP4603EF-LF reliable?
The price and inventory of MP4603EF-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4603EF-LF is usually 5 days.
3.What payment methods are accepted for MP4603EF-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4603EF-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4603EF-LF?
MP4603EF-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4603EF-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 MP4603EF-LF?
For technical support, including MP4603EF-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4603EF-LF requirements.
6.How does Aetrix verify that MP4603EF-LF is sourced from the original manufacturer or authorized distributors?
All MP4603EF-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 MP4603EF-LF meets industry standards.
7.What is the process for return or replacement of MP4603EF-LF?
All MP4603EF-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP4603EF-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 MP4603EF-LF part is unused and in its original packaging.
Return procedure for MP4603EF-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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