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Monolithic Power Systems Inc. MP3394ES-LF
- Part No.:
- MP3394ES-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3394ES-LF.pdf
- Description:
- IC LED DRV CTRL PWM 200MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
MP3394ES-LF from Monolithic Power Systems is a 4-string, step-up white LED driver IC designed for large LCD panel backlighting. It delivers up to 200mA per string with 2.5% current matching accuracy, operates from 5V–28V input, and regulates LED current via an external ISET resistor. Its programmable 145–600kHz switching frequency and dual-mode PWM/DC dimming support desktop monitors and LCD TVs.
For engineers reviewing the MP3394ES-LF datasheet, MP3394ES-LF pinout, MP3394ES-LF application, or MP3394ES-LF equivalent, key selection factors include its 350mV LED current-sense voltage, cascading capability for >4-string designs, open/short LED protection thresholds, and SOIC16 package thermal resistance (θJA = 80°C/W).
Technical Context
The MP3394ES-LF implements a peak-current-mode, fixed-frequency boost controller with four integrated current sinks. It uses an external N-MOSFET switch driven by a 6V gate driver (4Ω source / 2Ω sink impedance) and regulates output voltage by dynamically selecting the highest-voltage LED string as the feedback reference.
Its dual dimming architecture supports either external PWM input (100Hz–20kHz) on DBRT with BOSC biased by 100kΩ, or DC analog control (0.2–1.2V) on DBRT with BOSC capacitor-programmed internal oscillator (1–2kHz typical). Protection includes programmable OVP (1.23V threshold), LED UVLO (196mV), and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - powers both IC logic (via internal 6V LDO) and external MOSFET gate drive without auxiliary supply. |
| Max LED Current per String | 200mA - set by external ISET resistor; enables high-brightness backlighting for 12+ LEDs in series per string. |
| Current Matching Accuracy | ±2.5% - ensures uniform brightness across 4 strings without external calibration or trimming. |
| Switching Frequency Range | 145kHz to 600kHz - adjustable via ROSC resistor; balances inductor size, efficiency, and EMI in space-constrained displays. |
| LED Regulation Voltage | 350mV - low sense voltage minimizes power loss in current sources, improving thermal performance at full load. |
| OVP Threshold | 1.23V on OVP pin - sets overvoltage protection point via resistor divider; prevents damage during open-string fault conditions. |
| Dimming Frequency Range | 1kHz to 2kHz (internal) or 100Hz–20kHz (external) - supports flicker-free dimming down to 0.3% duty cycle at 100Hz. |
Pinout & Package
MP3394ES-LF is housed in a 16-pin SOIC package (body width 3.9mm, lead pitch 1.27mm) with exposed pad for thermal enhancement. Pin 1 is COMP; pins 4, 6, 15, and 16 are NC in SOIC16 configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Error amplifier compensation node | Connects ceramic capacitor to GND to stabilize boost loop; critical for transient response and stability with varying LED loads. |
| 2 EN | Enable control input | Active-high logic input; must be pulled to VCC or grounded-floating state disables IC and increases quiescent current to 2μA. |
| 3 DBRT | Brightness control interface | Accepts external PWM signal (1.2V min) or DC voltage (0.2–1.2V); determines dimming duty cycle with positive polarity. |
| 5 OSC | Switching frequency programming | Connects ROSC resistor to GND; 1.23V regulated reference enables precise fSW setting (e.g., 374kΩ → 165kHz). |
| 6 ISET | LED current programming | 1.23V-regulated node; current through RSET sets LED string current (e.g., 30kΩ → 32mA/string). |
| 7 BOSC | Dimming oscillator timing | Capacitor-connected node sets internal dimming frequency (3.5/CBOSC nF); resistor bias enables external PWM mode. |
| 8–11 LED4–LED1 | LED string cathode current sinks | Open-drain outputs sinking up to 200mA; each independently protected against open/short faults. |
| 12 OVP | Overvoltage protection input | Resistor-divider feedback node; triggers shutdown when voltage reaches 1.23V, protecting LEDs and MOSFET. |
| 13 ISENSE | Inductor current sensing | Peak-current-mode control input; tied to GND in single-IC configurations; used for master-slave cascading. |
| 14 GATE | External MOSFET gate driver | Drives N-channel MOSFET with 4Ω/2Ω push-pull; supports VDS up to 30V and fast switching with minimal gate charge loss. |
| 15 VIN | Main power input | Supplies IC core and boost converter; requires local 4.7μF X7R + 220μF electrolytic bypass for ripple suppression. |
| 16 VCC | Internal 6V LDO output | Powers gate driver and internal logic; drops to 0V during shutdown; bypassed with 1μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Cascading capability | Two or more MP3394ES-LF ICs can share one boost inductor and power stage while independently regulating up to 8+ LED strings. |
| Low 350mV current-sense voltage | Reduces conduction loss in current sinks by >40% vs. 1V references, enabling higher efficiency at 120mA/string and 125°C ambient. |
| Programmable OVP and LED UVLO | OVP threshold set via resistor divider; LED UVLO (196mV) detects open strings before output overvoltage occurs. |
| Under-voltage lockout | 4.2V rising-edge UVLO with 200mV hysteresis prevents erratic startup during brownout or slow-ramping input supplies. |
| Thermal shutdown | 150°C junction limit with automatic recovery; protects IC during sustained overload or poor heatsinking in enclosed displays. |
Applications
| Desktop LCD Monitors | LCD TV Backlighting |
|---|---|
|
Use Scenario: 24-inch WUXGA monitor with 4 parallel LED strings (12 LEDs × 4 strings) driven from 12V rail. IC Role / Device Role / Timing Role: Primary boost controller and per-string current regulator; synchronizes dimming across all strings using shared DBRT signal. Use Value: 2.5% current matching eliminates visible brightness banding; 350mV sense voltage reduces thermal load on PCB under continuous 150mA/string operation. |
Use Scenario: 43-inch 4K UHD TV backlight with 8-string configuration using two cascaded MP3394ES-LF ICs sharing one inductor. IC Role / Device Role / Timing Role: Master-slave LED driver pair; master handles boost regulation and COMP loop, slave provides additional current sinks. Use Value: Cascading eliminates need for second inductor and diode, reducing BOM cost and board area by 35% vs. discrete solutions. |
| Flat Panel Video Displays | Industrial Control Panel Backlights |
|
Use Scenario: 15-inch medical display requiring flicker-free dimming from 100% to 1% brightness with no audible noise. IC Role / Device Role / Timing Role: Constant-current LED driver with internal 1.5kHz dimming oscillator; DBRT accepts 0.5V analog input for smooth linear dimming. Use Value: 1–2kHz internal dimming frequency avoids audio-band switching noise; ±2.5% matching ensures consistent grayscale rendering. |
Use Scenario: Harsh-environment HMI panel operating from 24V industrial supply with frequent input transients. IC Role / Device Role / Timing Role: Robust LED driver with 28V max input rating, UVLO hysteresis, and thermal shutdown; withstands 30V surges per ABSOLUTE MAX ratings. Use Value: 28V input tolerance and 150°C shutdown enable reliable operation in unregulated 24V systems without external TVS or LDO pre-regulation. |
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 |
|---|---|---|---|
| MPQ3326-AEC1 | Automotive-grade AEC-Q100 qualified; same 4-string, 200mA/string topology but with integrated MOSFET and lower 3.5V min input. | Requires no external MOSFET; suited for automotive infotainment displays where space and qualification matter more than cost. | Select MPQ3326-AEC1 only if AEC-Q100 compliance and integrated FET are mandatory; MP3394ES-LF offers higher input voltage range and thermal headroom. |
| LM3409QMYX/NOPB | Single-string buck-boost LED driver with external MOSFET; lacks multi-string current matching and integrated dimming oscillator. | Needs four separate ICs and external current-matching circuitry to replicate 4-string function; higher component count and layout complexity. | Choose LM3409QMYX/NOPB only for non-backlight applications requiring flexible topology (buck/boost/SEPIC); not a functional replacement for MP3394ES-LF. |
Compared with MPQ3326-AEC1, MP3394ES-LF trades automotive qualification for wider input range (5–28V vs. 3.5–28V) and superior thermal dissipation in SOIC16 (80°C/W vs. 105°C/W). Against LM3409QMYX/NOPB, it delivers true 4-string integration with <2.5% matching-eliminating four-times bill-of-materials and layout overhead.
Availability
MP3394ES-LF is available at Aetrix Electronics and suitable for desktop LCD monitors, LCD TV backlighting, and industrial control panel backlights requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3394ES-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, with design centers in the US, China, and Taiwan.
The MP3394 product line targets large-panel LCD backlighting, emphasizing high-current precision, thermal resilience, and system-level integration for flat-panel display manufacturers.
FAQ
What is the minimum recommended ISET resistor value for MP3394ES-LF?
The ISET pin requires a resistor to ground to set LED current; the datasheet specifies a minimum RSET of 1.2kΩ for 120mA operation. Using lower values risks exceeding the 200mA per-string limit and triggering current-limit protection. The ISET voltage is regulated to 1.23V, so RSET = 1.23V / ILED; for 200mA, RSET = 6.15kΩ.
Can MP3394ES-LF drive more than 4 LED strings without external circuitry?
No-MP3394ES-LF has exactly four dedicated LED current-sink outputs (LED1–LED4). To drive more than four strings, multiple ICs must be cascaded: one master IC controls the boost converter and COMP loop, while slave ICs provide additional current sinks with their ISENSE pins tied to GND and COMP pins paralleled to the master.
How does the MP3394ES-LF handle an open LED string fault?
When an LED string opens, the corresponding LEDx pin voltage drops below 196mV. The IC detects this as an open-string fault, marks off that string, and continues regulating remaining strings using the highest-voltage active string as the feedback reference. If all strings open, the boost converter shuts down.
What is the purpose of the ISENSE pin in single-IC configurations?
In standalone operation, the ISENSE pin must be tied to GND-not left floating-to prevent erratic current-mode control. It is only actively used in master-slave cascading, where the master's ISENSE senses inductor current and the slave's ISENSE is grounded to disable its current-sense path.
Does MP3394ES-LF support analog dimming without PWM?
No-MP3394ES-LF only supports PWM-based dimming: either externally applied PWM signals on DBRT, or internally generated PWM via DC voltage on DBRT (0.2–1.2V) modulating an oscillator on BOSC. There is no true analog (linear) current control; dimming is always pulse-width based.
What thermal derating applies to MP3394ES-LF in SOIC16 package at 85°C ambient?
With θJA = 80°C/W, the maximum allowable power dissipation at 85°C ambient is (150°C – 85°C) / 80°C/W = 0.81W. At full 4×200mA load, typical power dissipation is ~0.65W, leaving 0.16W margin. For sustained operation, ensure ≥2cm² copper pour under exposed pad and airflow >100LFM.
MP3394ES-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP3394ES-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3394ES-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 MP3394ES-LF reliable?
The price and inventory of MP3394ES-LF 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 is usually 5 days.
3.What payment methods are accepted for MP3394ES-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3394ES-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3394ES-LF?
MP3394ES-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3394ES-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 MP3394ES-LF?
For technical support, including MP3394ES-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3394ES-LF requirements.
6.How does Aetrix verify that MP3394ES-LF is sourced from the original manufacturer or authorized distributors?
All MP3394ES-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 MP3394ES-LF meets industry standards.
7.What is the process for return or replacement of MP3394ES-LF?
All MP3394ES-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP3394ES-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 MP3394ES-LF part is unused and in its original packaging.
Return procedure for MP3394ES-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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