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Monolithic Power Systems Inc. MP3394ES-LF-Z
- Part No.:
- MP3394ES-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3394ES-LF-Z.pdf
- Description:
- IC LED DRV CTRL PWM 200MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
MP3394ES-LF-Z from Monolithic Power Systems is a 4-string, step-up white LED driver IC with programmable switching frequency (145–600 kHz), ±2.5% inter-string current matching, and 350 mV LED current-sense voltage for high-efficiency backlighting in large LCD panels. It regulates up to 200 mA per string from a 5–28 V input, supports external MOSFET gate drive, and integrates open/short LED protection and programmable over-voltage protection.
For engineers reviewing the MP3394ES-LF-Z datasheet, MP3394ES-LF-Z pinout, MP3394ES-LF-Z application, or MP3394ES-LF-Z equivalent, key selection considerations include its TSSOP16EP/SOIC16 package compatibility, dual dimming modes (external PWM or DC-input burst PWM), cascading capability for >4-string systems, and thermal shutdown at 150°C.
Technical Context
The MP3394ES-LF-Z implements a fixed-frequency, peak-current-mode boost controller with an internal 6 V LDO (VCC) powering gate drive and logic. Its regulation loop uses a 350 mV reference at ISENSE and compensates via the COMP pin with external RC network.
It features two independent timing circuits: ROSC sets boost switching frequency (145–600 kHz) via external resistor; CBOSC sets internal dimming oscillator frequency (1–2 kHz) for DC-input PWM mode. Dimming control supports both external PWM (applied to DBRT) and analog DC voltage (0.2–1.2 V) on DBRT with internal triangle generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 28 V - powers both IC logic and external N-MOSFET gate driver via integrated 6 V LDO. |
| Max LED Current per String | 200 mA - set by external RSET on ISET pin; typical 32 mA at RSET = 30 kΩ. |
| Current Matching Accuracy | ±2.5% - ensures uniform brightness across 4 LED strings without external balancing circuitry. |
| LED Sense Voltage | 350 mV - low dropout improves efficiency by minimizing power loss in current-source path. |
| Switching Frequency Range | 145 kHz to 600 kHz - programmable via ROSC resistor; enables optimization of inductor size and EMI performance. |
| OVP Threshold | 1.23 V at OVP pin - corresponds to ~1.1–1.2× nominal output voltage when configured with external divider. |
| Thermal Shutdown | 150 °C - protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
MP3394ES-LF-Z is packaged in SOIC16 (16-pin, 7.5 mm × 10.3 mm, 1.27 mm pitch) with exposed pad for thermal enhancement. Pin functions are identical to TSSOP16EP variant per datasheet Rev. 1.07.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Loop Compensation | Connects to external RC network to stabilize feedback loop; critical for transient response and stability. |
| 2 (EN) | Enable Input | Active-high digital control; must be driven - floating causes undefined operation. |
| 3 (DBRT) | Brightness Control | Accepts external PWM signal (100 Hz–20 kHz) or 0.2–1.2 V DC for linear dimming duty cycle control. |
| 4 (GND) | Power Ground | Common return for power stage, current sensing, and logic; requires low-impedance PCB plane. |
| 5 (OSC) | Frequency Set | Connects to GND via ROSC resistor; 1.23 V regulated voltage enables precise fSW programming. |
| 6 (ISET) | Current Set | Regulated at 1.23 V; LED current = 790 × 1.23 V / (RSET + 0.4 kΩ); sets all 4 strings identically. |
| 7 (BOSC) | Burst Oscillator | Connects to GND via capacitor for internal dimming frequency (1–2 kHz); resistor used in external PWM mode. |
| 8–11 (LED4–LED1) | String Cathode Outputs | Open-drain current sinks; each drives one LED string cathode; support short/open fault detection. |
| 12 (OVP) | Over-Voltage Sense | Monitors output via resistor divider; triggers shutdown if voltage exceeds programmed threshold (1.23 V). |
| 13 (ISENSE) | Inductor Current Sense | Peak-current-mode control input; tied to GND in slave-cascaded configurations. |
| 14 (GATE) | MOSFET Gate Driver | Drives external N-channel MOSFET; 4 Ω source / 2 Ω sink impedance supports fast switching. |
| 15 (VIN) | Main Supply Input | 5–28 V input for boost converter and internal LDO; requires local ceramic bypassing. |
| 16 (VCC) | LDO Output | 6 V ±0.5 V regulated supply for gate driver and internal circuitry; bypass with ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable Architecture | Enables expansion to 8+ LED strings using multiple MP3394s sharing single inductor and VIN; COMP and VCC pins synchronized between master/slave. |
| Dual Dimming Modes | Supports both external PWM (100 Hz–20 kHz) and DC-input burst PWM (0.2–1.2 V analog) - eliminates need for external dimming controller. |
| Integrated Fault Protection | Detects and marks off open or short LED strings independently; maintains regulation on remaining strings and shuts down only if all strings fail. |
| Low 350 mV Current-Sense Voltage | Reduces conduction loss in LED current path by >40% vs. typical 1 V references, directly improving system efficiency. |
| Programmable OVP & UVLO | OVP threshold set via external resistor divider; UVLO (4.2 V rising edge, 200 mV hysteresis) prevents startup under insufficient input. |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
Use Scenario: Backlighting for 24–32 inch desktop monitors with 4 parallel WLED strings (12–16 LEDs/string). IC Role / Device Role / Timing Role: Step-up controller and precision current regulator; manages boost voltage, string current balance, and synchronized PWM dimming. Use Value: Enables uniform luminance across full display area with <±2.5% string current mismatch and flicker-free dimming down to 0.3% duty cycle. | Use Scenario: Commercial signage and kiosk displays requiring wide dimming range and robust fault tolerance. IC Role / Device Role / Timing Role: Primary LED driver with open/short string protection and cascading support for extended channel count. Use Value: Maintains partial backlight operation during single-string failure, reducing service downtime and enabling field-repairable designs. |
| LCD TVs and Monitors | Industrial Human-Machine Interfaces |
Use Scenario: 32–55 inch LCD TV backlight with dynamic local dimming zones implemented via multiple MP3394ES-LF-Z units. IC Role / Device Role / Timing Role: Master/slave-configured LED driver providing synchronized dimming and shared boost power stage. Use Value: Eliminates inter-unit timing skew in multi-chip cascades, ensuring consistent zone brightness transitions during video content changes. | Use Scenario: Medical or industrial panel PCs operating in extended temperature ranges (−20°C to +125°C junction). IC Role / Device Role / Timing Role: High-reliability LED driver with thermal shutdown (150°C), UVLO hysteresis (200 mV), and RoHS-compliant packaging. Use Value: Ensures continuous backlight operation under thermal stress while meeting stringent safety and environmental compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-string WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3394-AEC1 | Automotive-grade variant with AEC-Q100 qualification, wider temp range (−40°C to +125°C), same pinout and electrical specs. | Required for automotive infotainment displays; not necessary for commercial/industrial use. | Select MPQ3394-AEC1 only if automotive qualification is mandated; otherwise MP3394ES-LF-Z offers cost and supply-chain advantage. |
| LM3409QMY/NOPB | Single-string buck-boost LED driver; no integrated current sources for multiple strings; requires external current mirrors or ICs for 4-string operation. | Suitable for flexible topology designs where string count varies; lacks native 4-string integration. | Choose LM3409QMY/NOPB only when topology flexibility or discrete current control is prioritized over integration and board space savings. |
Compared with MPQ3394-AEC1, MP3394ES-LF-Z trades automotive qualification for lower cost and broader commercial availability; versus LM3409QMY/NOPB, it delivers fully integrated 4-string regulation without external current-setting components or layout complexity.
Availability
MP3394ES-LF-Z is available at Aetrix Electronics and suitable for desktop LCD flat panel displays, LCD TVs and monitors, and industrial human-machine interfaces requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3394ES-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 MP3394 product line targets large-format LCD backlighting applications, emphasizing high current accuracy, thermal robustness, and multi-IC scalability for cost-effective, high-brightness display systems.
FAQ
What is the maximum total output current supported by MP3394ES-LF-Z?
The MP3394ES-LF-Z supports up to 200 mA per string across 4 independent strings, yielding a maximum total LED current of 800 mA. This assumes proper thermal design and external component derating; actual usable current depends on PCB copper area, ambient temperature, and inductor/MOSFET selection per the datasheet's thermal resistance values (θJA = 80°C/W for SOIC16).
Can MP3394ES-LF-Z operate with input voltage below 5 V?
No. The absolute minimum operating input voltage is 5 V per the Recommended Operating Conditions table. Below this, the internal 6 V LDO cannot regulate properly, and the UVLO circuit (rising edge at 4.2 V) prevents enablement. Attempting operation below 5 V risks unstable regulation, gate drive failure, or uncontrolled shutdown.
How does the MP3394ES-LF-Z handle an open LED string fault?
When an LED string opens, the corresponding LEDx pin voltage drops below 196 mV. The IC detects this condition, marks off the faulty string, and continues regulating remaining strings using the highest-voltage string as the reference. If all strings open, the boost converter shuts down entirely to prevent uncontrolled output overvoltage.
Is external compensation required on the COMP pin?
Yes. A Type II or Type III compensation network (typically RC + C) must be connected between COMP and GND to stabilize the current-mode boost control loop. Omitting this results in oscillation, poor transient response, or failure to regulate. The datasheet provides design equations and typical values based on selected inductor and output capacitance.
What is the purpose of the ISENSE pin in MP3394ES-LF-Z?
The ISENSE pin senses the voltage across the external inductor current-sense resistor to implement peak-current-mode control and cycle-by-cycle current limiting. In master-slave cascaded configurations, it must be tied to GND on slave ICs; leaving it floating causes undefined behavior and potential damage.
Does MP3394ES-LF-Z support analog (DC) dimming without PWM?
No. It supports only PWM-based dimming: either externally applied PWM signal on DBRT, or DC voltage (0.2–1.2 V) that the IC converts internally into a burst PWM waveform. There is no true linear analog dimming mode - current regulation remains digital PWM, even when controlled by DC voltage.
MP3394ES-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:
- 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:
- 200mA
- Frequency:
- 540kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -20°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP3394ES-LF-Z FAQ
1.How can I place an order for MP3394ES-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3394ES-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 MP3394ES-LF-Z reliable?
The price and inventory of MP3394ES-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 MP3394ES-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3394ES-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3394ES-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3394ES-LF-Z?
MP3394ES-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3394ES-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 MP3394ES-LF-Z?
For technical support, including MP3394ES-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3394ES-LF-Z requirements.
6.How does Aetrix verify that MP3394ES-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3394ES-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 MP3394ES-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3394ES-LF-Z?
All MP3394ES-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3394ES-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 MP3394ES-LF-Z part is unused and in its original packaging.
Return procedure for MP3394ES-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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