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Monolithic Power Systems Inc. MP3393EY-LF-P
- Part No.:
- MP3393EY-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3393EY-LF-P.pdf
- Description:
- 8-CH 350MA PER CHANNEL BOOST WLE
- Quantity:
- Payment:
- Shipping:
Inventory:4,425
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Product details
Overview
MP3393EY-LF-P from Monolithic Power Systems is an 8-channel step-up white LED driver controller with external NMOS gate drive and PNP transistor current regulation, designed for large LCD panel backlighting. It operates from 9V–32V input, delivers up to 300mA per string with 1.2% inter-string current matching, and features programmable 120–160kHz switching frequency via OSC resistor. Used in LCD TVs and monitors requiring precise, scalable LED current control.
For engineers reviewing the MP3393EY-LF-P datasheet, MP3393EY-LF-P pinout, MP3393EY-LF-P application, or MP3393EY-LF-P equivalent, key selection criteria include its 8-channel constant-current architecture, external MOSFET/BJT interface, 202mV FB regulation voltage, daisy-chain capability for >8 strings, and integrated open/short LED protection with fault flag output.
Technical Context
The MP3393EY-LF-P implements peak-current-mode step-up control with a programmable oscillator (120–160kHz typical) and internal 10V LDO for gate driver and logic supply. Its eight independent CTLx/FBx pairs regulate LED string current via external PNP transistors using a fixed 320mV reference at CTLx and 202mV average at FBx.
It integrates comprehensive fault management: OVP threshold set via resistor divider on OVP pin (1.23V trip), open-string detection via CTLx UVLO (210mV), short-string detection via CTLx overvoltage (6.4V), thermal shutdown at 150°C, and fault reporting through open-drain FF pin pulled low during any fault condition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 32V - supports wide industrial and consumer DC bus supplies without pre-regulation. |
| LED Channel Count | 8 independent strings - enables full backlight coverage for 32–65″ LCD panels with uniform luminance. |
| Current Matching Accuracy | ±1.2% between strings - ensures consistent brightness across display zones without manual calibration. |
| FB Regulation Voltage | 202mV typical - low sense voltage minimizes power loss in current-sense resistors and improves efficiency. |
| Switching Frequency | 120–160kHz (ROSC = 115kΩ) - balances EMI, inductor size, and MOSFET conduction vs. switching losses. |
| CTLx Regulation Voltage | 320mV - sets base-emitter bias for external PNP transistors to achieve precise current mirroring. |
| Fault Flag Output | Open-drain FF pin - provides single-wire system-level fault indication compatible with microcontroller GPIOs. |
| Thermal Shutdown | 150°C junction temperature - protects IC and external components under sustained overload or poor heatsinking. |
Pinout & Package
MP3393EY-LF-P is housed in a SOIC-28 package with exposed pad (no thermal pad connection required per datasheet; pad tied to GND). Pin count: 28. Package dimensions: 17.9mm × 7.5mm × 2.3mm (SOIC28).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Power Input & Boost Switch Source | Accepts 9–32V input; also serves as high-side switch node for external NMOS - requires local ceramic bypassing. |
| VCC (2) | Internal 10V LDO Output | Powers gate driver and internal logic; regulated 10V output usable for biasing external circuitry. |
| COMP (3) | Error Amplifier Compensation Node | Connects RC network to stabilize boost loop; shared across daisy-chained devices for synchronized regulation. |
| OSC (4) | Frequency Set Input | Resistor-to-GND sets switching frequency; internal 1.23V reference enables precise fSW programming. |
| EN (5) | Enable Control Input | Logic-level enable (1.85V high threshold); must not float - use pull-up/pull-down and local capacitor. |
| DIM (6) | Analog/PWM Dimming Input | 0.4–1.5V analog dimming or >1.5V PWM signal (50Hz–2kHz) - enables flicker-free brightness control. |
| FB1–FB8 (7,9,11,13,16,18,20,22) | LED String Current Sense Inputs | Each connects to current-sense resistor; 202mV regulation enables accurate per-string current setting. |
| CTL1–CTL8 (8,10,12,14,15,17,19,21) | External Transistor Base Drive Outputs | Sink up to 9.5mA each to bias PNP transistors - forms closed-loop current mirror per string. |
| FF (23) | Fault Flag Output | Open-drain output pulled low during OVP, open/short LED, or thermal shutdown - simplifies system fault monitoring. |
| OVP (24) | Over-Voltage Protection Input | Resistor-divider feedback node; trips at 1.23V to disable boost when output exceeds safe level. |
| GND (25) | Power Ground Reference | Main ground return for boost converter and internal circuits - connect to low-impedance PCB plane. |
| ISENSE (26) | Inductor Peak Current Sense | Monitors inductor current for cycle-by-cycle limiting; tie to GND if not used in daisy-chain configuration. |
| GATE (27) | External NMOS Gate Driver Output | Drives gate of external N-channel MOSFET; 4Ω source / 2Ω sink impedance supports fast switching. |
| VFAULT (28) | Fault Disconnection Control | Drives external PMOS to disconnect VIN from boost stage during fault - enhances system safety. |
Key Features
| Feature | Design Value |
|---|---|
| 8-Channel Independent Constant-Current Control | Enables simultaneous regulation of 8 LED strings with ±1.2% matching - eliminates need for per-string DACs or op-amps. |
| Daisy-Chain Expandability | Multiple MP3393EY-LF-P units share COMP and VCC to scale to 16+ strings using one power stage - reduces BOM and layout complexity. |
| Integrated Open/Short LED Protection | Automatically detects and disables faulty strings via CTLx voltage thresholds (210mV UVLO / 6.4V OV) - prevents overvoltage stress on remaining strings. |
| Programmable Over-Voltage Protection | OVP threshold set by external resistor divider on OVP pin - allows precise alignment with LED string forward voltage margin (e.g., 1.15×Vf). |
| Low 202mV FB Regulation Voltage | Reduces I²R loss in current-sense resistors by >50% vs. 500mV references - improves thermal performance and efficiency at high currents. |
| Thermal Shutdown + Fault Flag Reporting | 150°C shutdown with FF pin assertion - enables fail-safe system response and diagnostics without external monitoring ICs. |
Applications
| LCD TV Backlight | Monitor Backlight |
|---|---|
Use Scenario: Driving 8 parallel WLED strings (10–15 LEDs each) in 43–65″ LCD TV panels with local dimming zones. IC Role / Device Role / Timing Role: Step-up controller regulating per-string current via external PNP transistors; synchronizes dimming across all strings using shared DIM/EN signals. Use Value: Achieves <1.2% luminance variation across panel while supporting analog and PWM dimming down to 0.1% brightness without color shift. | Use Scenario: Powering dual-zone edge-lit monitor backlights with independent brightness control for sRGB and HDR modes. IC Role / Device Role / Timing Role: Primary LED driver managing 8 strings with daisy-chained second MP3393EY-LF-P for 16-string operation and unified COMP loop. Use Value: Enables seamless transition between color gamuts by maintaining identical current regulation accuracy across both zones without calibration. |
| Commercial Display Backlight | Digital Signage Backlight |
Use Scenario: Backlighting 55″ commercial displays operating 24/7 in kiosks or retail environments with ambient temperature up to 70°C. IC Role / Device Role / Timing Role: High-reliability LED controller with thermal shutdown and fault flag reporting - interfaces with system MCU for predictive maintenance. Use Value: Extends LED lifetime by limiting junction temperature rise and preventing runaway conditions during prolonged high-brightness operation. | Use Scenario: Driving high-brightness WLED arrays in outdoor digital signage requiring >1000 nits luminance and robust fault handling. IC Role / Device Role / Timing Role: Fault-tolerant backlight driver with open/short LED detection and VFAULT-controlled input disconnection - meets IP65 system safety requirements. Use Value: Prevents catastrophic failure from single-string faults and maintains partial backlight functionality during field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel WLED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3393-AEC1 | Automotive-grade variant with AEC-Q100 qualification, extended -40°C to +125°C operation, and enhanced ESD immunity. | Required for automotive infotainment displays; not suitable for cost-sensitive consumer TVs due to higher price and qualification overhead. | Select when automotive qualification, wider temperature range, or higher reliability under vibration/thermal cycling is mandatory. |
| LM3409QMY/NOPB | Single-channel synchronous buck-boost LED controller with integrated 1.5A MOSFET; no multi-string current matching or daisy-chain capability. | Requires 8 separate controllers and external current-matching circuitry - increases board area, component count, and calibration effort. | Choose only for low-channel-count designs (<4 strings) where integration and simplicity outweigh matching accuracy needs. |
Compared with MP3393EY-LF-P, MPQ3393-AEC1 adds automotive qualification but offers identical electrical performance and pinout, whereas LM3409QMY/NOPB lacks native multi-string support and requires significant redesign to match 8-string functionality and current matching.
Availability
MP3393EY-LF-P is available at Aetrix Electronics and suitable for LCD TV backlighting, commercial display systems, and digital signage applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3393EY-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 design centers in the US, China, and Taiwan.
The MP3393 product line targets large-panel LCD backlighting, delivering integrated step-up control with precision current regulation, fault resilience, and scalability - optimized for cost, efficiency, and manufacturability in mass-market displays.
FAQ
What is the maximum LED string current supported per channel?
The MP3393EY-LF-P regulates up to 300mA per string under recommended operating conditions (TA ≤ +125°C, proper thermal design). The datasheet specifies "Maximum Channel Current Over 350mA" but confirms 300mA as the validated maximum for continuous operation with margin. Exceeding this requires derating based on thermal resistance (θJA = 60°C/W for SOIC28) and ambient temperature.
Can MP3393EY-LF-P drive MOSFETs directly, or does it require external transistors?
MP3393EY-LF-P drives an external NMOS FET via its GATE pin (27) and controls 8 LED strings using external PNP BJTs via CTLx pins (8,10,12,14,15,17,19,21). It does not integrate power switches - the external NMOS handles boost conversion, while external PNPs provide per-string current regulation. This architecture decouples power handling from control logic.
How does the daisy-chain function work between multiple MP3393EY-LF-P devices?
Daisy-chaining connects two or more MP3393EY-LF-P ICs by tying their VCC and COMP pins together, sharing one master's GATE signal, and grounding slave ISENSE pins. The master regulates the output voltage while all devices synchronize current regulation via the shared COMP node - enabling expansion to 16+ strings without additional compensation networks.
What dimming methods does MP3393EY-LF-P support, and what are their voltage ranges?
MP3393EY-LF-P supports analog dimming (0.4V–1.5V DC input on DIM pin for 0–100% brightness) and external PWM dimming (>1.5V amplitude, 50Hz–2kHz frequency). Analog dimming provides smooth, low-frequency control without PWM artifacts; PWM dimming enables high-contrast, flicker-free operation ideal for video content.
Is the SOIC28 package of MP3393EY-LF-P thermally enhanced?
The SOIC28 package (MP3393EY) has standard thermal characteristics: θJA = 60°C/W and θJC = 30°C/W on a 4-layer PCB per JESD51-7. Unlike the TSSOP28EP variant, it does not feature an exposed thermal pad. For high-power operation (>2W dissipation), forced airflow or copper pour under the IC is recommended to maintain TJ ≤ 125°C.
What protection features are integrated, and how are faults signaled?
MP3393EY-LF-P integrates under-voltage lockout (7.5–8.5V), LED open/short detection (via CTLx UVLO/OV thresholds), over-voltage protection (OVP pin), and thermal shutdown (150°C). All faults assert the open-drain FF pin low; VFAULT pin also activates to disconnect input power via external PMOS - providing dual-layer fault isolation.
Does MP3393EY-LF-P require external compensation components?
Yes - the COMP pin (3) requires an external RC network (typically 1–10nF capacitor + 10–100kΩ resistor to GND) to stabilize the step-up converter's control loop. The exact values depend on input/output voltage, inductance, and load; MPS Application Note AN107 provides design guidelines and example calculations for common configurations.
MP3393EY-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 32V
- Voltage - Output:
- -
- Current - Output / Channel:
- 300mA
- Frequency:
- 140kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MP3393EY-LF-P FAQ
1.How can I place an order for MP3393EY-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3393EY-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 MP3393EY-LF-P reliable?
The price and inventory of MP3393EY-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 MP3393EY-LF-P is usually 5 days.
3.What payment methods are accepted for MP3393EY-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3393EY-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3393EY-LF-P?
MP3393EY-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3393EY-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 MP3393EY-LF-P?
For technical support, including MP3393EY-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3393EY-LF-P requirements.
6.How does Aetrix verify that MP3393EY-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3393EY-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 MP3393EY-LF-P meets industry standards.
7.What is the process for return or replacement of MP3393EY-LF-P?
All MP3393EY-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3393EY-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 MP3393EY-LF-P part is unused and in its original packaging.
Return procedure for MP3393EY-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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