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Monolithic Power Systems Inc. MP4603ES-LF-Z
- Part No.:
- MP4603ES-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4603ES-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 2.5A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,821
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Product details
Overview
MP4603ES-LF-Z from Monolithic Power Systems is a current-mode buck-boost white LED driver IC designed for large LCD TV backlight systems with LED string voltages up to 350V, featuring integrated 0.5Ω power MOSFET, ±5% 200mV feedback reference, and support for >1:1000 dimming ratio via combined PWM and analog control. It operates from 5V–80V input and delivers regulated output voltage from VINH to VINH+68V.
For engineers reviewing the MP4603ES-LF-Z datasheet, MP4603ES-LF-Z pinout, MP4603ES-LF-Z application, or MP4603ES-LF-Z equivalent, key selection criteria include its novel power-leverage-control architecture, dual-dimming capability, LED open/short protection behavior, and SOIC16 thermal performance under high-voltage LED string bias conditions.
Technical Context
The MP4603ES-LF-Z implements peak-current-mode control with programmable slope compensation (0.12–0.235 V/μs) to ensure stability at duty cycles >50%. Its dual-input architecture accepts separate low-voltage supply (VINL = 12V) and high-voltage bias (VINH ≤ 350V), enabling efficient drive of long LED strings without high-side switching stress.
It integrates fault detection logic that latches off on LED short (FB ≥ 600 mV or FB ≥ 300 mV for 450 μs) or OVP (OVP ≥ 1.2 V), with FAULT pin pulled to INGND. Dimming control combines external PWM (100 Hz–50 kHz) and analog (0–1.2 V on ADIM) inputs, with internal COMP hold during PWM OFF for fast current response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost regulator with integrated 0.5Ω MOSFET - enables high-efficiency, compact design for >350V LED strings using low-voltage controller supply. |
| Input Voltage Range | 5V to 80V - supports standard 12V/24V auxiliary rails while tolerating transient surges up to 85V absolute max. |
| Feedback Reference | 200 mV ±5% - sets precise LED current via external RFB; enables 120 mA output with 1.67 Ω sense resistor. |
| Dimming Ratio | >1:1000 - achieved by combining PWM (≤200 Hz) and analog dimming; no external dimming FET required. |
| Switching Frequency | 0.65–1.2 MHz (FST-pin programmable) - allows optimization of inductor size and EMI; synchronizable via SYN pin. |
| Protection Features | LED open/short, OVP (1.2 V threshold), cycle-by-cycle current limit, thermal shutdown (150°C) - ensures robust operation in unattended TV backlight systems. |
| Quiescent Current | 10 μA in shutdown - minimizes standby power loss in always-on display subsystems. |
Pinout & Package
The MP4603ES-LF-Z is housed in a 16-pin SOIC package with exposed pad (JEDEC MS-012 AC), rated for -20°C to +85°C ambient operation and 1.6 W max power dissipation at TA = +25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FAULT | Open-drain fault indicator | Pulled to INGND during LED open/short or OVP; high-Z otherwise - enables system-level fault monitoring without pull-up. |
| 2 VIN | Main low-voltage supply input | Accepts 5–80V DC; requires local ceramic decoupling to suppress switching noise and input transients. |
| 3 INGND | Input ground reference | Separate from VSS; used as reference for FAULT, EN, PWM, ADIM, SYN - reduces ground bounce in high-current LED return paths. |
| 4 SYN | Frequency synchronization input | Accepts external clock (0.1–2 MHz) or connects to other MP4603s for master-slave sync - eliminates beat frequencies in multi-channel backlight systems. |
| 5 PWM | PWM dimming control | Logic-level input (ON >2.2 V, OFF <1.65 V); floating defaults to ON - directly interfaces with MCU GPIO or dedicated dimming controllers. |
| 6 EN | Enable control | Active-high enable (ON >1.5 V, OFF <0.9 V); 3.8 μA input current - supports low-power microcontroller wake-up sequencing. |
| 7 ADIM | Analog dimming input | 0–1.2 V linear control of LED current (0–100%); floating defaults to full brightness - compatible with DAC outputs or potentiometer-based manual dimming. |
| 8 FST | Frequency set | Resistor-to-VSS sets fSW (0.65–1.2 MHz); open defaults to ~0.9 MHz - enables EMI tuning without changing layout. |
| 9 SLOPE | Slope compensation adjust | Resistor-to-VSS sets compensation (0.12–0.235 V/μs); open defaults to 0.5 V/μs - stabilizes current loop in wide VIN/VOUT buck-boost operation. |
| 10 COMP | Error amplifier output | Connect ≥1 nF capacitor to VSS for loop compensation and soft-start - prevents overshoot during startup or PWM transitions. |
| 11 FB | Current sense feedback | Regulates voltage across external RFB to 200 mV; triggers short protection if >300 mV for 450 μs - defines LED current accuracy and fault timing. |
| 12 OVP | Over-voltage protection input | Voltage divider sets latch-off threshold at 1.2 V; folds back frequency if OVP drops below 0.4 V - safeguards LED strings and downstream components. |
| 13 DGD | Dimming gate driver output | Drives external MOSFET for series LED dimming; sourcing/sinking capability supports high-side or low-side switch configurations. |
| 14 VSS | Negative output reference | Ground reference for OVP, FB, COMP, SLOPE, DGD, FST - isolated from INGND to support floating high-voltage LED cathode drive. |
| 15 SW | Internal switch node | Source of integrated MOSFET; connects to inductor and Schottky rectifier - high di/dt node requiring short, wide PCB traces. |
| 16 BST | Bootstrap supply | Capacitor between SW and BST forms floating gate drive supply - enables high-side N-channel MOSFET drive without external charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Power-leverage-control topology | Uses fixed high-voltage bias (VINH) + low-voltage regulator (VINL) to drive 350V LED strings with 12V supply - reduces MOSFET voltage stress and enables smaller magnetics. |
| Integrated 0.5Ω MOSFET | Eliminates external high-voltage switch; supports continuous 2.5 A peak current - simplifies BOM and improves thermal coupling in SOIC16 package. |
| Dual-dimming interface | Independent PWM and ADIM pins allow simultaneous use - achieves >1:1000 dimming ratio without external dimming FET or complex timing circuits. |
| Programmable protection thresholds | OVP (via resistor divider), LED short delay (450 μs), and thermal shutdown (150°C) - configurable for specific panel voltage/current requirements and safety standards. |
| Sync-capable oscillator | SYN pin accepts 0.1–2 MHz external clock or daisy-chains multiple ICs - eliminates beat interference in multi-string TV backlight systems. |
Applications
| Large-Screen LCD TV Backlighting | Commercial Digital Signage |
|---|---|
Use Scenario: Driving 100-LED strings in 65-inch+ LCD TVs with VINH ≈ 150V and 120 mA per string. IC Role / Device Role / Timing Role: Primary LED current regulator and fault monitor; manages buck-boost conversion, dimming, and OVP in real time. Use Value: Enables >99.5% efficiency and super-high power density by leveraging VINH bias instead of full-string switching - reduces heatsink size and system cost. | Use Scenario: Multi-zone backlight control in outdoor kiosks requiring wide temperature range (-20°C to +85°C) and high reliability. IC Role / Device Role / Timing Role: High-voltage LED string controller with synchronized dimming across zones; FAULT pin feeds into system health monitoring. Use Value: Integrated thermal shutdown and LED open/short protection eliminate need for external supervision circuitry - improves MTBF in unattended deployments. |
| High-Power LED Street Lighting | Industrial Control Panel Backlights |
Use Scenario: Constant-current drive for 48–72 V LED modules in smart streetlights with surge-prone AC-DC front-end. IC Role / Device Role / Timing Role: Robust LED driver with 85V absolute max VIN rating and cycle-by-cycle current limiting - withstands line transients and brownouts. Use Value: 0.5Ω RDS(ON) MOSFET and 10 μA shutdown current reduce conduction losses and standby power - extends luminaire lifetime and lowers energy cost. | Use Scenario: Dimmable backlight for operator interface panels in factory automation systems with EMC-sensitive environments. IC Role / Device Role / Timing Role: EMI-optimized LED driver with programmable fSW and SYNC capability - meets CISPR-22 Class B limits without added filtering. Use Value: Slope compensation (0.12–0.235 V/μs) and soft-start via COMP capacitor prevent startup instability - ensures consistent brightness during PLC-controlled power cycling. |
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 TJ range (−40°C to +125°C), and enhanced ESD immunity. | Required for automotive infotainment displays; not suitable for cost-sensitive consumer TV designs. | Select when operating ambient exceeds +85°C or functional safety compliance (ISO 26262) is mandated. |
| LT3761EFE#PBF | Boost-only topology; no buck-boost capability; higher external component count; 3.3V reference vs. 200mV. | Limited to lower-voltage LED strings (<100V); lacks integrated MOSFET and dual-dimming interface. | Choose only if VINH bias architecture is unavailable and system can tolerate larger solution size and reduced dimming flexibility. |
Compared with MPQ4603-AEC1, the MP4603ES-LF-Z offers lower cost and optimized thermal performance for commercial TV use, while LT3761EFE#PBF requires external high-side switch and provides no analog dimming path - making MP4603ES-LF-Z superior for high-voltage, high-dimming-ratio, space-constrained backlight designs.
Availability
MP4603ES-LF-Z is available at Aetrix Electronics and suitable for large-screen LCD TV backlighting, commercial digital signage, and high-power LED street lighting requiring stable component supply, RoHS-compliant packaging, and SOIC16 thermal management.
Supply support for MP4603ES-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 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, compact backlight systems in large-format displays where power density, dimming fidelity, and fault resilience are critical.
FAQ
What is the maximum LED string voltage the MP4603ES-LF-Z can drive?
The MP4603ES-LF-Z supports LED string voltages up to 350V by leveraging its power-leverage-control architecture: it regulates only a small portion of the total string voltage while using a fixed high-voltage bias (VINH). The output voltage range is VINH to VINH+68V, enabling compatibility with 60-inch and larger LCD TV backlights.
How does the MP4603ES-LF-Z achieve >1:1000 dimming ratio?
It combines independent PWM dimming (100 Hz–50 kHz, ON/OFF threshold at 1.65 V/2.2 V) and analog dimming (0–1.2 V on ADIM pin) with internal COMP pin hold during PWM OFF intervals. This preserves error amplifier state for rapid current recovery, enabling deep dimming without flicker or color shift in large-panel applications.
Can the MP4603ES-LF-Z operate without an external high-voltage bias (VINH)?
No. The MP4603ES-LF-Z requires both VIN (5–80V low-voltage supply) and VINH (high-voltage bias, typically 125–160V) to function. VINH supplies the LED string anode; the IC regulates the cathode-side voltage. Omitting VINH disables the power-leverage architecture and prevents proper LED string biasing.
What is the role of the INGND and VSS pins, and why are they separate?
INGND serves as the reference for control pins (EN, PWM, ADIM, SYN, FAULT), minimizing noise coupling from high-current switching. VSS is the reference for power and feedback pins (FB, OVP, COMP, SLOPE, DGD, SW), enabling accurate current sensing and floating high-voltage operation. Separation prevents ground bounce from degrading regulation accuracy or fault detection.
Does the MP4603ES-LF-Z require external slope compensation resistors in all designs?
No. The SLOPE pin defaults to 0.5 V/μs internal compensation when left open or connected to RSLOPE > 400 kΩ. External RSLOPE (20–400 kΩ) is only needed when duty cycle exceeds 50% and stability analysis indicates insufficient internal slope - typical in high VINH/VIN ratios or low-inductance designs.
How is LED open-circuit protection triggered and reset?
LED open protection activates when FB voltage falls near 0 V, causing duty cycle to increase until OVP pin reaches 1.2 V, triggering latch-off and pulling FAULT low. Recovery requires cycling the EN pin (low-to-high transition); no automatic restart occurs to prevent uncontrolled re-energization of open-circuit strings.
What is the thermal resistance (θJA) of the MP4603ES-LF-Z in SOIC16 package?
The junction-to-ambient thermal resistance is 80°C/W, measured per JESD51-7 on a 4-layer PCB. With a maximum junction temperature of 150°C and ambient of +85°C, the device supports up to 812.5 mW continuous power dissipation (PD = (150 − 85)/80) before entering thermal shutdown.
MP4603ES-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MP4603ES-LF-Z FAQ
1.How can I place an order for MP4603ES-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4603ES-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 MP4603ES-LF-Z reliable?
The price and inventory of MP4603ES-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 MP4603ES-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4603ES-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4603ES-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4603ES-LF-Z?
MP4603ES-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4603ES-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 MP4603ES-LF-Z?
For technical support, including MP4603ES-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4603ES-LF-Z requirements.
6.How does Aetrix verify that MP4603ES-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4603ES-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 MP4603ES-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4603ES-LF-Z?
All MP4603ES-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4603ES-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 MP4603ES-LF-Z part is unused and in its original packaging.
Return procedure for MP4603ES-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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