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Monolithic Power Systems Inc. MP3394EF-LF
- Part No.:
- MP3394EF-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP3394EF-LF.pdf
- Description:
- IC LED DRVR CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,510
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Product details
Overview
MP3394EF-LF from Monolithic Power Systems is a step-up white LED driver IC with four integrated current sources, 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 regulates LED current via external ISET resistor with 350mV sense voltage. It drives external N-MOSFETs in fixed-frequency peak-current-mode boost topology for desktop monitors and LCD TVs.
For engineers reviewing the MP3394EF-LF datasheet, MP3394EF-LF pinout, MP3394EF-LF application, or MP3394EF-LF equivalent, key selection criteria include programmable switching frequency (145–600 kHz), dual PWM/DC dimming control, open/short LED protection, OVP threshold programming, and cascading capability across multiple ICs using shared inductor architecture.
Technical Context
The MP3394EF-LF implements a peak-current-mode, fixed-frequency boost controller with internal 6V LDO (VCC) powering gate drive and logic. Its 4-channel current regulation uses open-drain LEDX outputs with 350mV reference voltage and 2.5% matching accuracy between strings at 32mA.
Dimming is supported via two modes: external PWM applied to DBRT with BOSC biased by resistor, or DC analog voltage (0.2–1.2V) on DBRT with BOSC capacitor setting internal triangle frequency (1–2 kHz typical). Protection includes programmable OVP (1.23V threshold), LEDX UVLO (196mV), short-string detection (>6.3V), and thermal shutdown at 150°C.
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 high-brightness WLED arrays for large-panel backlighting |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across 4 LED strings without external calibration |
| Switching Frequency Range | 145 kHz to 600 kHz - set by ROSC resistor; balances efficiency, EMI, and inductor size |
| LED Regulation Voltage | 350mV - low sense voltage minimizes power loss in current-setting path |
| OVP Threshold | 1.23V at OVP pin - programmable overvoltage protection prevents damage during open-string fault |
| Dimming Frequency Range | 1.0–2.0 kHz (BOSC cap) - sets internal PWM carrier for smooth DC-input dimming |
| Thermal Shutdown | 150°C - protects die under sustained overload or poor heatsinking |
Pinout & Package
TSSOP16EP package with exposed thermal pad (θJA = 45°C/W, θJC = 10°C/W); RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Loop compensation node | Connects ceramic capacitor to GND to stabilize feedback loop; critical for transient response and stability |
| 2 EN | Enable control input | Active-high logic input; must be driven - floating causes undefined operation |
| 3 DBRT | Brightness control input | Accepts external PWM signal or 0.2–1.2V DC for linear dimming duty cycle control |
| 4 GND | Power and signal ground | Common reference for all analog and digital circuitry; requires low-impedance PCB plane |
| 5 OSC | Oscillator frequency set | Resistor-to-GND sets switching frequency (fSW ≈ 62.1kΩ / ROSC); regulated at 1.23V |
| 6 ISET | LED current programming | Resistor-to-GND sets per-string current (ILED ≈ 790 × 1.23V / RSET); regulated at 1.23V |
| 7 BOSC | Dimming oscillator timing | Capacitor-to-GND sets internal dimming frequency (fBOSC ≈ 3.5 / CBOSC); sawtooth waveform generated |
| 8–11 LED4–LED1 | LED string cathode outputs | Open-drain current sinks; each regulates one WLED string with 350mV compliance voltage |
| 12 OVP | Over-voltage protection input | Resistor divider from output sets OVP trip point; triggers shutdown when ≥1.23V |
| 13 ISENSE | Inductor current sensing | Senses external RSENSE voltage for peak-current-mode control; tie to GND if unused in master-slave config |
| 14 GATE | N-MOSFET gate driver output | Drives external high-side N-channel MOSFET; 4Ω source / 2Ω sink impedance |
| 15 VIN | Main power input | Supplies IC bias and boost converter; bypass with local ceramic + bulk capacitor |
| 16 VCC | Internal 6V LDO output | Powers gate driver and internal logic; requires 1μF ceramic bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel independent current regulation | Each LEDX pin delivers precise, matched current up to 200mA with 350mV sense voltage |
| Programmable switching frequency | 145–600 kHz via ROSC resistor - enables optimization of magnetics size, efficiency, and EMI |
| Dual dimming interface | Supports both external PWM (100Hz–20kHz) and DC analog (0.2–1.2V) inputs for flexible system integration |
| Cascadable architecture | Multiple MP3394s can share single inductor and synchronize dimming via tied COMP/EN/DBRT pins |
| Comprehensive fault protection | Includes open-string detection, short-string OVP (>6.3V), OVP threshold programming, UVLO, and thermal shutdown |
| Integrated 6V LDO | VCC output powers gate driver and internal circuitry - eliminates need for external bias supply |
Applications
| Desktop LCD Monitors | LCD TV Backlighting |
|---|---|
Use Scenario: Driving 4 parallel strings of 12-series white LEDs in 24-inch desktop monitor with 120mA/string. IC Role / Device Role / Timing Role: Step-up controller + per-string current regulator; manages boost conversion timing and synchronized PWM dimming. Use Value: Delivers uniform brightness with <2.5% string mismatch and supports flicker-free 1–2kHz internal dimming for eye comfort. | Use Scenario: Backlighting 42-inch LCD TV with 8-string extension using two MP3394EF-LF ICs sharing one inductor. IC Role / Device Role / Timing Role: Master-slave configured LED driver; COMP pin sharing ensures unified output voltage regulation across all strings. Use Value: Reduces BOM count and layout complexity while maintaining <2.5% current matching across 8 strings. |
| Flat Panel Video Displays | Industrial Control Panel Displays |
Use Scenario: High-reliability video wall tile using 4-string WLED array with open/short LED fault tolerance. IC Role / Device Role / Timing Role: Fault-aware LED driver; detects open-string faults within milliseconds and disables only affected channels. Use Value: Maintains partial display functionality during single-string failure - improves system uptime and serviceability. | Use Scenario: Embedded HMI display in factory automation equipment operating from 24V rail with thermal constraints. IC Role / Device Role / Timing Role: Thermally robust LED driver; 150°C shutdown and 45°C/W θJA enable operation in sealed enclosures. Use Value: Eliminates need for external thermal monitoring circuitry while ensuring safe long-term operation at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3326-AEC1 | Automotive-grade AEC-Q100 qualified; same 4-string, 200mA/string, but adds spread-spectrum switching and enhanced ESD | Required for automotive infotainment displays; not drop-in due to different pinout and higher cost | Select when automotive qualification, lower EMI, or higher reliability under vibration/temperature cycling is mandatory |
| LM3409QMH/NOPB | Single-channel buck-boost LED driver; no integrated current sources; requires external current sense per string | Suitable for custom multi-channel designs with discrete current regulation; lacks native 4-string integration | Choose when flexibility in topology (buck-boost vs boost-only) or discrete current control per string is preferred |
Compared with MP3394EF-LF, MPQ3326-AEC1 offers automotive qualification and spread-spectrum EMI reduction but requires board redesign, while LM3409QMH provides topology flexibility at the cost of added external components and reduced integration for multi-string systems.
Availability
MP3394EF-LF is available at Aetrix Electronics and suitable for desktop LCD monitors, LCD TV backlighting, flat panel video displays, and industrial control panel displays requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3394EF-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, headquartered in Kirkland, WA, with global design and support centers.
The MP3394 belongs to MPS's WLED backlight driver product line, engineered specifically for energy-efficient, high-accuracy multi-string LED control in large-format LCD panels with integrated protection and dimming flexibility.
FAQ
What is the maximum total output current supported by MP3394EF-LF?
The MP3394EF-LF supports up to 200mA per string across four independent channels, yielding a maximum total regulated LED current of 800mA. This assumes proper thermal management - the TSSOP16EP package dissipates up to 2.78W at 25°C ambient, and junction temperature must remain below 150°C under full load.
Can MP3394EF-LF operate with input voltage below 5V?
No. The absolute minimum operating input voltage is 5V, with UVLO rising threshold specified at 3.8–4.6V and hysteresis of 200mV. Operation below 5V violates recommended conditions and risks unstable startup, incomplete OVP self-test, or failure to engage the internal 6V LDO - all confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables.
How is LED current accuracy affected by temperature?
The datasheet specifies ±2.5% current matching between strings at TA = +25°C, but does not characterize drift over temperature. However, the ISET pin reference voltage (1.23V typ.) has ±1% initial tolerance and ±50 ppm/°C drift, and the 350mV current sense reference exhibits similar stability - implying total current error remains within ±4% over –20°C to +125°C junction range under typical conditions.
Does MP3394EF-LF support analog (DC) dimming only, or PWM dimming too?
It supports both: DC analog dimming (0.2–1.2V on DBRT pin) and external PWM dimming (100Hz–20kHz applied to DBRT). In DC mode, brightness is linearly proportional to input voltage; in PWM mode, it responds to duty cycle. The BOSC pin selects mode - capacitor for DC mode, resistor for PWM mode - as confirmed in the Dimming Control section and Figure 2.
What happens during an open LED string fault?
When one or more LED strings open, the MP3394EF-LF detects low voltage (<196mV) on the corresponding LEDX pin and marks that string off. Output voltage rises until OVP threshold is reached, then regulation shifts to remaining active strings. If all strings open, the boost converter shuts down completely - behavior verified in the Open String Protection section and Typical Performance waveforms.
Is the TSSOP16EP package thermally enhanced?
Yes. The TSSOP16EP includes an exposed thermal pad (EP) on the underside, achieving θJA = 45°C/W and θJC = 10°C/W on a 4-layer JEDEC PCB - significantly better than SOIC16 (θJA = 80°C/W). Proper soldering of the EP pad to a thermal plane is required to realize this performance, as stated in the Thermal Resistance note and Package Reference diagram.
Can multiple MP3394EF-LF ICs share the same OSC resistor for synchronized switching?
No. Each MP3394EF-LF requires its own ROSC resistor on the OSC pin; the oscillator is not synchronized across devices. However, dimming synchronization is achievable by tying EN and DBRT pins together across master/slave ICs - confirmed in the Extending LED Channels section, which explicitly states "It is recommended to use external PWM dimming mode to achieve the accurate dimming synchronization of both parts."
MP3394EF-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP-EP
MP3394EF-LF FAQ
1.How can I place an order for MP3394EF-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3394EF-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 MP3394EF-LF reliable?
The price and inventory of MP3394EF-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3394EF-LF is usually 5 days.
3.What payment methods are accepted for MP3394EF-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3394EF-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3394EF-LF?
MP3394EF-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3394EF-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 MP3394EF-LF?
For technical support, including MP3394EF-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3394EF-LF requirements.
6.How does Aetrix verify that MP3394EF-LF is sourced from the original manufacturer or authorized distributors?
All MP3394EF-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 MP3394EF-LF meets industry standards.
7.What is the process for return or replacement of MP3394EF-LF?
All MP3394EF-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP3394EF-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 MP3394EF-LF part is unused and in its original packaging.
Return procedure for MP3394EF-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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