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Monolithic Power Systems Inc. MP3394SGY
- Part No.:
- MP3394SGY
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3394SGY.pdf
- Description:
- IC LED DRV CTRL PWM 180MA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
MP3394SGY from Monolithic Power Systems is a step-up white LED driver IC with four independent current-regulated channels, designed for large-size LCD panel backlighting. It operates from 5V to 28V input, delivers up to 200mA per string, achieves 2.5% inter-string current matching, and supports programmable switching frequency (140–670 kHz) via external resistor. Used in flat-panel TVs and monitors where precise brightness uniformity across multiple LED strings is critical.
For engineers reviewing the MP3394SGY datasheet, MP3394SGY pinout, MP3394SGY application, or MP3394SGY equivalent, key selection criteria include its SOIC20 package compatibility, open/short LED fault protection behavior, DC-input vs. external PWM dimming implementation, and cascading capability for >4-string configurations using multiple MP3394S devices.
Technical Context
The MP3394SGY employs peak-current-mode control with fixed-frequency operation, where switching frequency is set by an external resistor on the OSC pin and dimming frequency (in DC-input mode) is set by a capacitor on the BOSC pin. Its internal error amplifier regulates output voltage by dynamically selecting the highest active LEDX pin voltage to maintain sufficient bus voltage for all strings.
It integrates four matched current sinks (LED1–LED4), each with 300mV regulation voltage and ±2.5% matching accuracy, plus dedicated protection circuitry including OVP threshold detection (1.23V at OVP pin), LEDX UVLO (196mV), and thermal shutdown at 150°C. The ISENSE pin enables current limiting and supports cascading topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - powers both IC logic and external boost MOSFET; supports wide-range industrial and display power rails. |
| Max Output Current per String | 200mA - sets upper limit for single-string LED load; actual operating current set by ISET resistor (e.g., 32mA typical with 30kΩ). |
| Current Matching Accuracy | ±2.5% - ensures luminance uniformity across 4 LED strings without external calibration. |
| Switching Frequency Range | 140–670 kHz - adjustable via ROSC; higher frequencies reduce inductor size but increase switching loss. |
| OVP Threshold | 1.23V at OVP pin - triggers shutdown when output overvoltage exceeds programmed level; set via external resistor divider. |
| Dimming Control Modes | External PWM (100Hz–20kHz) or DC-input PWM (0.2–1.2V analog) - enables flexible brightness control with synchronized or analog interface options. |
| Thermal Shutdown | 150°C - protects die during overload or poor PCB thermal design; device resumes operation after cooldown and EN reassertion. |
Pinout & Package
MP3394SGY is housed in a 20-pin SOIC package with exposed pad (not electrically connected in SOIC20 variant). Pin 1 is marked by a beveled corner; pins 4, 6, 15, and 16 are NC. The exposed pad on TSSOP16EP is GND-connected, but SOIC20 has no thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OVP | Over-voltage protection sense input; 1.23V threshold triggers shutdown to prevent output overvoltage damage. |
| 2 | LED4 | Open-drain current sink output for LED string 4 cathode connection; enables individual string dimming and fault detection. |
| 3 | LED3 | Open-drain current sink output for LED string 3 cathode; shares same regulation loop and protection as LED4. |
| 4 | NC | No connect - must remain unconnected; not internally bonded in SOIC20 package. |
| 5 | LED2 | Open-drain current sink output for LED string 2 cathode; matched to other LEDx pins within 2.5% current accuracy. |
| 6 | NC | No connect - unused pin; leave floating or unpopulated per layout guidelines. |
| 7 | LED1 | Open-drain current sink output for LED string 1 cathode; primary reference string for output voltage regulation. |
| 8 | VCC | Internal 5.8V LDO output; powers gate driver and internal logic; requires local 1µF ceramic bypass to GND. |
| 9 | VIN | Main power input (5–28V); supplies both IC bias and external boost MOSFET drain path. |
| 10 | GATE | N-channel MOSFET gate driver output; drives external high-side switch with 4Ω source / 2Ω sink impedance. |
| 11 | ISENSE | Peak current-sense input for inductor current limiting; tied to GND in non-cascaded designs. |
| 12 | OVP | Duplicate OVP pin - same function as Pin 1; used in SOIC20 for layout symmetry (both pins must be connected identically). |
| 13 | ISET | LED current programming node; 1.22V regulated reference; current set by resistor to GND (e.g., 30kΩ → 32mA/string). |
| 14 | GND | Signal ground reference; separate from power ground in high-noise layouts to minimize coupling. |
| 15 | NC | No connect - unassigned pin in SOIC20; no internal connection. |
| 16 | NC | No connect - unassigned pin in SOIC20; no internal connection. |
| 17 | COMP | Control loop compensation node; connects to GND via ceramic capacitor to stabilize feedback loop. |
| 18 | EN | Enable input; active-high (≥1.8V); disables IC and reduces quiescent current to 2μA when low. |
| 19 | DBRT | Brightness control input; accepts either PWM signal (external dimming) or 0.2–1.2V DC (internal dimming duty control). |
| 20 | BOSC | Burst oscillator timing pin; capacitor to GND sets internal dimming frequency (1–2kHz typical); resistor to GND enables external PWM mode. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel current regulation | Independent open-drain LEDx outputs with 2.5% matching - eliminates need for external current mirrors or trimming in multi-string backlight systems. |
| Programmable OVP protection | Resistor-divider-set threshold (1.23V reference) - allows safe operation with varying LED string counts and forward voltages without redesign. |
| Dual dimming architecture | Hardware-selectable PWM or DC-input mode - supports both microcontroller-driven PWM signals and analog DAC-based brightness control. |
| Cascading capability | COMP and VCC pin sharing between master/slave ICs - enables 8+ string expansion using single inductor and shared feedback loop. |
| Integrated fault protection | Dedicated open/short LED detection per string plus thermal shutdown - prevents catastrophic failure during LED or wiring faults. |
Applications
| Desktop LCD Monitors | 2D/3D LCD TVs |
|---|---|
|
Use Scenario: Backlighting for 24–32 inch IPS panels requiring uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: Primary LED current controller managing four parallel WLED strings; regulates bus voltage dynamically based on highest-string forward voltage. Use Value: 2.5% current matching ensures <±0.5% luminance variation across screen, meeting ISO 9241-307 uniformity requirements for professional displays. |
Use Scenario: Edge-lit backlight system in 43–65 inch consumer TVs with local dimming zones. IC Role / Device Role / Timing Role: String driver in zone-controlled architecture; EN and DBRT pins synchronized to MCU for dynamic zone brightness scaling. Use Value: Dual dimming modes allow factory calibration via DC-input and real-time adjustment via external PWM - simplifying firmware and reducing BOM count. |
| Flat Panel Video Displays | Industrial Control Panels |
|
Use Scenario: High-brightness signage displays operating 24/7 in ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Constant-current source with thermal shutdown and OVP - maintains stable output despite input rail droop and temperature drift. Use Value: 150°C thermal shutdown and -40°C to +125°C operating range ensure reliability in uncooled enclosures without derating. |
Use Scenario: HMI backlighting in factory automation panels with ESD-prone environments and long service life requirements. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short string detection - prevents total backlight failure during field maintenance or connector wear. Use Value: Automatic marking of faulty strings allows remaining strings to stay lit at full brightness - preserving operator visibility during partial failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3367-AEC1 | Automotive-grade AEC-Q100 qualified; 150mA max/string; integrated MOSFET; 3.3V–40V input. | Designed for automotive infotainment displays; lacks cascading support and external MOSFET drive flexibility. | Select when automotive qualification and smaller footprint are required, but accept lower max current and no external FET option. |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller; 1.25A max; requires external current sense and MOSFETs; no multi-string matching. | Used in high-power single-string or RGB applications; no native 4-string current balancing or OVP pin. | Choose only for non-backlight applications needing >200mA or buck-boost topology; not suitable as direct replacement for MP3394SGY's 4-string function. |
Compared with MP3394SGY, MPQ3367-AEC1 trades cascading capability and external MOSFET drive for automotive compliance and integration, while LM3409QMY offers higher current headroom but requires full discrete design effort and provides no inter-string matching - making MP3394SGY optimal for cost-sensitive, high-uniformity LCD backlighting.
Availability
MP3394SGY is available at Aetrix Electronics and suitable for desktop LCD monitors, 2D/3D LCD TVs, and industrial control panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3394SGY 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 MP3394S product line targets large-format LCD backlighting, emphasizing precision current matching, robust fault protection, and flexible dimming - enabling manufacturers to achieve high visual quality without complex external circuitry.
FAQ
What is the maximum allowable LED string voltage for MP3394SGY?
The absolute maximum voltage at any LEDx pin is +55V, but practical string voltage is limited by the OVP threshold setting and external MOSFET rating. With a typical 1.23V OVP reference and 10:1 resistor divider, the protected output voltage is ~12.3V; for higher strings, adjust R-divider to scale OVP accordingly while staying within the 55V pin rating.
Can MP3394SGY operate without an external MOSFET?
No - MP3394SGY is a controller-only IC and requires an external N-channel MOSFET connected to the GATE pin. It does not integrate a power switch. The GATE driver delivers 4Ω sourcing / 2Ω sinking capability to efficiently drive standard logic-level MOSFETs with QG ≤ 20nC.
How does open-string protection behave when only one LED string fails?
When one string opens, its LEDx pin voltage drops below 196mV, triggering automatic marking OFF. The IC continues regulating output voltage using the remaining three strings, maintaining full brightness on functional strings without affecting system stability or requiring reset.
Is the SOIC20 package thermally equivalent to the TSSOP16EP variant?
No - SOIC20 has θJA = 72°C/W and θJC = 30°C/W, while TSSOP16EP achieves θJA = 45°C/W and θJC = 10°C/W due to its exposed thermal pad. For high-power operation (>1.2W dissipation), TSSOP16EP is strongly preferred; SOIC20 requires careful PCB copper area design to avoid thermal throttling.
What happens if the ISET resistor is omitted or left floating?
The ISET pin must never float - it is regulated to 1.22V and sources current proportional to LED string current. An open ISET causes undefined current regulation, potential overcurrent, and possible thermal shutdown. Always connect ISET to GND via a defined resistor (e.g., 30kΩ for 32mA/string).
Does MP3394SGY support analog (DC) dimming without external components?
Yes - applying 0.2–1.2V DC directly to the DBRT pin enables analog dimming with no additional circuitry. Below 0.2V the output is fully off; above 1.2V it is fully on. No capacitor on BOSC is needed in this mode, simplifying layout for basic brightness control.
Can multiple MP3394SGY ICs share the same EN signal in a cascaded configuration?
Yes - EN is CMOS-compatible and can drive multiple ICs in parallel. In cascaded setups, tying EN and DBRT together across master and slave ICs ensures synchronized startup and dimming, eliminating visible timing skew between LED zones.
MP3394SGY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 180mA
- Frequency:
- 670kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MP3394SGY FAQ
1.How can I place an order for MP3394SGY through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3394SGY 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 MP3394SGY reliable?
The price and inventory of MP3394SGY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3394SGY is usually 5 days.
3.What payment methods are accepted for MP3394SGY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3394SGY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3394SGY?
MP3394SGY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3394SGY 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 MP3394SGY?
For technical support, including MP3394SGY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3394SGY requirements.
6.How does Aetrix verify that MP3394SGY is sourced from the original manufacturer or authorized distributors?
All MP3394SGY 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 MP3394SGY meets industry standards.
7.What is the process for return or replacement of MP3394SGY?
All MP3394SGY units undergo pre-shipment inspection (PSI). If there is an issue with MP3394SGY, 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 MP3394SGY part is unused and in its original packaging.
Return procedure for MP3394SGY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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