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Monolithic Power Systems Inc. MP3394ES-LF-P
- Part No.:
- MP3394ES-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3394ES-LF-P.pdf
- Description:
- FOR NEW DESIGNS, RECOMMEND MP339
- Quantity:
- Payment:
- Shipping:
Inventory:1,373
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Product details
Overview
MP3394ES-LF-P from Monolithic Power Systems is a step-up white LED driver IC with four independent current-regulated channels, designed for large LCD panel backlighting. It operates from 5V–28V input, delivers up to 200mA per string, achieves ±2.5% inter-string current matching, and uses external MOSFET control with 350mV LED current-sense voltage for high efficiency in flat-panel TV and monitor applications.
For engineers reviewing the MP3394ES-LF-P datasheet, MP3394ES-LF-P pinout, MP3394ES-LF-P application, or MP3394ES-LF-P equivalent, key selection criteria include programmable switching frequency (145–600 kHz), dual dimming modes (external PWM or DC-input burst PWM), open/short LED protection, cascading capability for >4-string designs, and TSSOP16EP/SOIC16 package compatibility.
Technical Context
The MP3394ES-LF-P implements a peak-current-mode, fixed-frequency boost controller with internal 6V LDO (VCC) powering gate drive and logic. Its regulation loop uses COMP-pin compensation and senses LED current via 350mV reference at ISENSE, enabling tight current matching across strings without external op-amps.
Dimming is implemented either by direct PWM injection at DBRT (with BOSC biased by resistor) or DC voltage (0.2–1.2V) applied to DBRT generating internal DPWM using BOSC capacitor timing (100 Hz–20 kHz). Protection includes OVP (programmable via resistor divider on OVP pin), thermal shutdown (150°C), UVLO (4.2V threshold), and per-string open/short detection with automatic mark-off and recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide-range DC supplies including 12V and 24V industrial rails |
| Max LED Current per String | 200mA - enables driving high-brightness WLED arrays with up to 12-series LEDs per string |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across 4 backlight strings without external trimming |
| Switching Frequency Range | 145 kHz to 600 kHz - set externally via ROSC resistor for EMI optimization and inductor size trade-offs |
| LED Regulation Voltage | 350mV - low sense voltage minimizes power loss in current-source FETs, improving thermal performance |
| Dimming Control Modes | External PWM (2–20 kHz) or DC-input burst PWM (0.2–1.2V analog) - provides flexibility for MCU-based or analog brightness control |
| OVP Threshold Accuracy | ±2.5% (1.23V reference) - allows precise overvoltage cutoff to protect LEDs and output capacitors |
| Thermal Shutdown | 150°C - integrated sensor disables boost converter to prevent permanent junction damage |
Pinout & Package
TSSOP16EP and SOIC16 packages are confirmed for MP3394ES-LF-P (per ordering table: MP3394ES = SOIC16; MP3394EF = TSSOP16EP; both share identical pin functions). Pin mapping validated against datasheet Figure 1 and PIN FUNCTIONS table (Rev. 1.07, pp.5–6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Loop Compensation Node | Connects to RC network stabilizing feedback loop; critical for transient response and stability with varying LED load capacitance |
| 2 (EN) | Enable Input | Active-high digital control; must be driven (not floating); initiates soft-start sequence when asserted |
| 3 (DBRT) | Brightness Control Input | Accepts either external PWM signal or 0.2–1.2V DC for linear dimming; defines duty cycle of internal DPWM generator |
| 4 (GND) | Power & Signal Ground | Common return for all analog and power paths; requires low-impedance PCB plane connection |
| 5 (OSC) | Frequency Set Input | Resistor-to-GND sets switching frequency (fSW ≈ 62.1 / ROSC[kΩ] kHz); regulates internal oscillator current |
| 6 (ISET) | LED Current Reference | Resistor-to-GND programs string current (ILED ≈ 790 × 1.23V / RSET[kΩ] mA); 1.23V regulated reference ensures accuracy |
| 7 (BOSC) | Burst Oscillator Timing | Capacitor-to-GND sets internal dimming frequency (fBOSC ≈ 3.5 / CBOSC[nF] kHz) for DC-input mode |
| 8–11 (LED4–LED1) | String Cathode Outputs | Open-drain current sinks; each drives one LED string cathode; support individual fault detection and mark-off |
| 12 (OVP) | Over-Voltage Sense Input | Resistor-divider from output bus sets OVP trip point (1.23V threshold); protects against open-string overvoltage |
| 13 (ISENSE) | Inductor Current Sense | Monitors external sense resistor for peak-current-mode control and cycle-by-cycle current limiting |
| 14 (GATE) | N-MOSFET Gate Driver Output | Drives external high-side N-channel switch; 4Ω source / 2Ω sink impedance supports fast switching |
| 15 (VIN) | Main Power Input | Supplies IC bias and boost converter; bypassed locally with ceramic + bulk capacitor for ripple suppression |
| 16 (VCC) | Internal 6V Regulator Output | Powers gate driver and internal logic; drops to 0V during shutdown; requires local 1μF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel current balancing | ±2.5% matching enables uniform backlight luminance without per-string calibration |
| Programmable OVP | Resistor-divider on OVP pin allows setting protection threshold 1.1–1.2× nominal VOUT to avoid nuisance trips |
| Cascadable architecture | Multiple MP3394s can share single inductor and VIN rail while synchronizing dimming via shared EN/DBRT signals |
| Low 350mV current-sense voltage | Reduces conduction loss in LED-string FETs by >40% vs. typical 1V references, improving thermal margin |
| Dual dimming interface | Supports both microcontroller-generated PWM and analog DAC output, simplifying system-level integration |
| Per-string fault isolation | Independent open/short detection on LED1–LED4 pins allows continued operation with up to 3 functional strings |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
Use Scenario: 24-inch desktop monitor with 4-zone edge-lit WLED array requiring flicker-free dimming and consistent color temperature. IC Role / Device Role / Timing Role: Primary LED current controller managing four parallel strings; regulates string current and executes synchronized PWM dimming at 1kHz. Use Value: ±2.5% current matching eliminates visible banding; 350mV sense voltage reduces thermal stress on string FETs, enabling compact heatsink design. | Use Scenario: Commercial video wall tile with 1080p resolution and 1000-nit brightness, operating 24/7 under ambient temperature up to 65°C. IC Role / Device Role / Timing Role: Backlight driver with open-string protection and thermal shutdown; maintains illumination during single-string failure. Use Value: Automatic mark-off of failed strings preserves 75% backlight output; 150°C thermal shutdown prevents field failures in sealed enclosures. |
| LCD TVs | Professional Monitors |
Use Scenario: 55-inch 4K UHD TV with local dimming zones, where backlight uniformity directly impacts contrast ratio and HDR performance. IC Role / Device Role / Timing Role: High-accuracy current source for main backlight bank; interfaces with system MCU via PWM dimming input for dynamic scene-based brightness control. Use Value: Programmable 145–600 kHz switching frequency allows optimizing inductor size and EMI filter for slim chassis; ±2.5% matching sustains >10,000:1 contrast. | Use Scenario: Medical imaging display requiring DICOM-compliant grayscale linearity and zero luminance drift over 8-hour shifts. IC Role / Device Role / Timing Role: Precision LED driver with DC-input dimming mode; accepts calibrated 0.2–1.2V analog signal from display controller for stable luminance scaling. Use Value: DC-input burst PWM eliminates timing jitter from MCU-generated PWM, ensuring sub-0.1% luminance variation across full brightness range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3367-AEC1 | Automotive-grade AEC-Q100 qualified; integrates 6-channel drivers; higher max current (250mA/string); requires external boost inductor | Targeted for automotive infotainment displays with vibration/shock requirements; lacks cascading support of MP3394ES-LF-P | Select for automotive designs needing qualification; not drop-in due to different pinout and channel count |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller; no integrated current sources; requires external current-sense amplifiers for multi-string use | Suitable for custom topologies with variable input/output ranges; lacks native 4-string matching or OVP programming | Choose only when topology flexibility outweighs integration benefits; adds BOM cost and layout complexity |
Compared with MP3394ES-LF-P, MPQ3367-AEC1 offers automotive qualification and higher per-string current but sacrifices cascading and pin compatibility; LM3409QMY/NOPB provides topology freedom but requires external circuitry to match MP3394ES-LF-P's 4-string accuracy and protection features.
Availability
MP3394ES-LF-P is available at Aetrix Electronics and suitable for LCD TV backlighting, professional monitor design, and commercial flat-panel video display manufacturing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3394ES-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP3394 product line targets large-format LCD backlighting, emphasizing high-current accuracy, multi-string reliability, and flexible dimming-designed specifically for cost-sensitive, high-volume display applications demanding robust fault handling.
FAQ
What is the maximum allowable LED string voltage for MP3394ES-LF-P?
The absolute maximum voltage at any LEDx pin is +55V, but practical operation is limited by the external boost stage design. With 28V input and typical 12-LED white strings (3.2V each), output reaches ~40V; OVP should be set to ~44–48V using the resistor divider on the OVP pin to allow margin while preventing overvoltage stress.
Can MP3394ES-LF-P drive more than four LED strings?
Yes-two or more MP3394ES-LF-P ICs can be cascaded using the master-slave configuration described in the datasheet. The master drives the shared inductor and GATE signal; slaves tie COMP and VCC together and disable their GATE outputs. This extends capacity to 8+ strings while maintaining synchronized dimming and current matching.
How does the 350mV LED current-sense voltage improve efficiency?
The 350mV reference reduces power dissipation in the current-setting path: at 200mA/string, sense loss is 70mW per string versus 200mW at 1V. This lowers thermal load on the IC and external FETs, improves overall system efficiency by 1.2–1.8%, and allows smaller PCB copper areas without derating.
Is external PWM dimming compatible with the SOIC16 package?
Yes-pin functionality is identical across SOIC16 (MP3394ES), TSSOP16EP (MP3394EF), and SOIC20 (MP3394EY) packages. For external PWM dimming, connect a 100kΩ resistor from BOSC to GND and apply a 2–20kHz PWM signal ≥1.2V peak to DBRT; SOIC16 layout must maintain clean routing to minimize noise coupling into DBRT.
What failure modes trigger automatic string mark-off?
Mark-off activates for open strings (LEDx pin voltage <196mV after OVP threshold breach) or short strings (LEDx pin voltage >6.3V sustained for 2048 switching cycles). Once marked off, the string is disabled until device reset via EN toggle or power cycle; remaining strings continue regulation.
Does MP3394ES-LF-P require an external Schottky diode?
Yes-the boost topology requires an external Schottky diode (D1 in Typical Application schematic) between the inductor output and VOUT. Diode selection must meet reverse voltage rating >1.5× max VOUT and forward current >1.5× peak inductor current; MPS recommends 40V/3A devices like SS34 or equivalent.
How is thermal shutdown behavior implemented?
When die temperature reaches 150°C, the internal thermal sensor forces shutdown of the GATE driver and disables switching. VCC remains active, allowing status monitoring via EN and DBRT. Recovery occurs automatically once junction temperature falls below 135°C hysteresis threshold, resuming soft-start sequence without external reset.
MP3394ES-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 145kHz ~ 600kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -20°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP3394ES-LF-P FAQ
1.How can I place an order for MP3394ES-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3394ES-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 MP3394ES-LF-P reliable?
The price and inventory of MP3394ES-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 MP3394ES-LF-P is usually 5 days.
3.What payment methods are accepted for MP3394ES-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3394ES-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3394ES-LF-P?
MP3394ES-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3394ES-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 MP3394ES-LF-P?
For technical support, including MP3394ES-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3394ES-LF-P requirements.
6.How does Aetrix verify that MP3394ES-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3394ES-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 MP3394ES-LF-P meets industry standards.
7.What is the process for return or replacement of MP3394ES-LF-P?
All MP3394ES-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3394ES-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 MP3394ES-LF-P part is unused and in its original packaging.
Return procedure for MP3394ES-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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