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Monolithic Power Systems Inc. MP3384LGQ-Z
- Part No.:
- MP3384LGQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MP3384LGQ-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,439
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Product details
Overview
MP3384LGQ-Z from Monolithic Power Systems is a 4-string white LED driver IC with integrated step-up converter and independent current regulation for LCD backlighting. It operates from 3V–25V input, delivers up to 50V boost output, supports 625kHz/1.25MHz switching frequency selection, achieves ±2.5% inter-string current matching, and regulates each string at 600mV compliance voltage-enabling efficient, compact tablet and notebook display power solutions.
For engineers reviewing the MP3384LGQ-Z datasheet, MP3384LGQ-Z pinout, MP3384LGQ-Z application, or MP3384LGQ-Z equivalent, this page provides verified technical context on PWM dimming control, open/short LED protection behavior, OVP threshold programming, and QFN-16 thermal performance under real-world backlight load conditions.
Technical Context
The MP3384LGQ-Z implements peak-current-mode control with selectable 625kHz or 1.25MHz fixed-frequency operation, using an internal 5V LDO (VCC) to power gate drivers and logic. Its feedback loop uses the lowest active LEDx pin voltage as reference, regulating output to maintain 600mV across each current source.
It integrates four matched 40mA-capable open-drain current sinks with independent short/open detection per string, plus programmable over-voltage protection triggered at 1.23V on the OVP pin-enabling robust fault handling without external comparators or microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 25V - supports single-cell Li-ion (3.0V cutoff) through 24V industrial rails |
| Max Boost Output | 50V - drives up to 10 white LEDs in series per string (3.2V × 10 = 32V typical) |
| String Current Accuracy | ±2.5% matching - ensures uniform brightness across 4 independent backlight zones |
| Regulation Voltage | 600mV - minimizes conduction loss in current sources, improving efficiency at full load |
| Switching Frequency | Selectable 625kHz or 1.25MHz - enables trade-off between inductor size (47µH vs 22µH) and EMI profile |
| PWM Dimming Range | 100Hz–2kHz - compatible with standard backlight controllers and avoids audible noise |
| OVP Threshold | Programmable via resistor divider - triggers shutdown when VOVP reaches 1.23V, protecting LEDs from overvoltage |
Pinout & Package
The MP3384LGQ-Z is housed in a thermally enhanced 3mm × 3mm QFN-16 package with exposed thermal pad connected to PGND. The package supports ≤2.1W continuous power dissipation at +25°C ambient (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Control Input | Active-high logic input; must be driven-floating causes undefined startup behavior |
| 2 OSC | Frequency Select | GND = 625kHz; floating or VCC = 1.25MHz-no external clock required |
| 3 ISET | Current Programming | Connects to ground via RSET; sets all 4 string currents identically (e.g., 60.4kΩ → 20mA) |
| 4 GND | Analog Ground Reference | Separate from PGND; requires low-noise local decoupling for COMP and VCC stability |
| 5 PWM | PWM Dimming Input | Accepts 1.5V–5V logic-level signal; controls duty cycle of all 4 LED strings simultaneously |
| 6–9 LED1–LED4 | String Cathode Outputs | Open-drain current sinks; each regulates its string independently with 600mV compliance |
| 10 OVP | Over-Voltage Sense | Monitors output via resistor divider; trips at 1.23V to disable boost on open-string failure |
| 12 PGND | Power Ground Return | High-current return path for SW and LED strings; must connect to exposed thermal pad |
| 13 SW | Internal MOSFET Drain | Switches up to 1.2A peak; connects to inductor and Schottky diode anode |
| 14 COMP | Error Amplifier Output | Requires RC network to GND for loop compensation; determines transient response and stability |
| 15 VCC | Internal 5V LDO Output | Powers gate driver and logic; bypass with ≥1µF ceramic capacitor; UVLO disables chip if <2.2V |
| 16 VIN | Main Supply Input | 3V–25V input; requires local 4.7µF X5R/X7R ceramic bypass near pin |
Key Features
| Feature | Design Value |
|---|---|
| Independent 4-string current regulation | Each LEDx pin delivers matched current with ≤2.5% inter-string error-critical for uniform LCD luminance |
| Programmable open-string protection | OVP pin monitors output via resistor divider; shuts down boost when VOVP reaches 1.23V-prevents LED overvoltage during open-circuit faults |
| Short-string detection & disable | Flags LEDx voltage >5.5V for >1.6ms; disables faulty string while maintaining regulation on remaining strings |
| Thermal shutdown with hysteresis | Triggers at TJ = 150°C; resumes operation only after die cools below ~130°C-prevents latch-up during sustained overload |
| Low-quiescent-current shutdown | Draws only 2μA when EN = 0V-enables battery-powered systems to minimize standby drain |
Applications
| Notebook Computers | Tablet Computers |
|---|---|
Use Scenario: Driving 4 parallel LED strings behind 10.1″–13.3″ LCD panels with dynamic PWM dimming. IC Role / Device Role / Timing Role: Primary backlight controller with integrated boost converter and per-string current regulation. Use Value: Eliminates need for external current DACs or discrete MOSFETs-reducing BOM count by ≥6 components per design. | Use Scenario: Powering dual-zone backlight in 7″–10″ tablets operating from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Step-up LED driver with 3V minimum input support and 600mV compliance voltage. Use Value: Enables full brightness at battery end-of-discharge (3.0V), extending usable runtime by ~12% versus higher-VIN alternatives. |
| Digital Picture Frames | Hand-Held Terminal Displays |
Use Scenario: Illuminating static 4.3″–7″ TFT displays in consumer photo frames with ambient light sensing. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable OVP and thermal protection. Use Value: Prevents LED degradation from overvoltage during firmware update or sensor failure-extending display life beyond 50,000 hours. | Use Scenario: Backlighting ruggedized 5″–8″ industrial terminals powered from 12V DC input with wide temperature range. IC Role / Device Role / Timing Role: High-reliability LED driver with -40°C to +125°C junction rating and short-string recovery. Use Value: Maintains display visibility during partial LED failure-ensuring operational continuity in mission-critical field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8532GQW | Fixed 1MHz switching; no frequency select pin; 3.5% current matching; 700mV compliance voltage | Lacks OSC pin flexibility and tighter current matching-less suitable for high-uniformity displays | Prefer MP3384LGQ-Z when inter-string brightness uniformity <3% is required |
| LM3409QMYX/NOPB | External MOSFET driver; requires external current sense resistors per string; no integrated current sources | Higher BOM cost and layout complexity; better for >40mA/string or custom topology needs | Choose LM3409QMYX/NOPB only when >40mA per string or discrete FET control is mandatory |
Compared with RT8532GQW and LM3409QMYX/NOPB, the MP3384LGQ-Z delivers superior current matching (±2.5% vs ±3.5%), lower compliance voltage (600mV vs 700mV), and built-in frequency selection-making it optimal for compact, high-efficiency, multi-string LCD backlight designs where board space and luminance uniformity are critical.
Availability
MP3384LGQ-Z is available at Aetrix Electronics and suitable for notebook computers, tablet computers, and digital picture frames requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3384LGQ-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 design centers in the US, China, and Taiwan.
The MP3384L product line targets LCD backlight applications requiring high-efficiency, multi-string LED driving in space-constrained portable devices-emphasizing integration, thermal resilience, and fault tolerance.
FAQ
What is the minimum input voltage required for MP3384LGQ-Z to start switching?
The MP3384LGQ-Z begins operation when VIN exceeds 3.0V and VCC rises above its 2.2V UVLO falling threshold. Startup occurs after internal soft-start initiates, typically within 1–2ms of valid EN assertion. Below 3.0V, the device remains in under-voltage lockout regardless of EN state.
How does the MP3384LGQ-Z handle an open LED string during operation?
When one LED string opens, the corresponding LEDx pin voltage drops below 180mV. The IC detects this as an open fault, disables the affected string, and continues regulating remaining strings using the next-highest LEDx voltage as feedback reference-maintaining backlight output without full shutdown.
Can the MP3384LGQ-Z drive more than 4 LED strings?
No-the MP3384LGQ-Z integrates exactly four current-regulated outputs (LED1–LED4). It cannot drive additional strings without external current mirrors or parallel ICs. Each LEDx pin is internally matched and calibrated; adding external circuitry degrades current accuracy and voids specified ±2.5% matching.
What is the recommended PCB layout practice for thermal management?
Connect the exposed thermal pad directly to a solid PGND copper pour covering ≥75% of the pad area, with ≥4 thermal vias (0.3mm diameter) to inner/ground planes. Route high-current paths (SW→PGND→inductor→diode) as short and wide as possible to minimize parasitic inductance and heating.
Does the MP3384LGQ-Z support analog dimming in addition to PWM?
No-the MP3384LGQ-Z supports only PWM dimming via the dedicated PWM pin. It does not include analog dimming capability (e.g., ISET voltage modulation or VCC scaling). Brightness control is achieved exclusively by varying the duty cycle of the external 100Hz–2kHz PWM signal.
What happens if the ISET resistor is omitted or left floating?
Omitting or floating the ISET pin disables all LED string regulation. The IC will not enter normal operation-no current flows through LED1–LED4, and the boost converter remains inactive. The datasheet explicitly states "Do not leave the ISET pin floating," as it serves as both current reference and functional enable for the regulation loop.
MP3384LGQ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MP3384LGQ-Z FAQ
1.How can I place an order for MP3384LGQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3384LGQ-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 MP3384LGQ-Z reliable?
The price and inventory of MP3384LGQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3384LGQ-Z is usually 5 days.
3.What payment methods are accepted for MP3384LGQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3384LGQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3384LGQ-Z?
MP3384LGQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3384LGQ-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 MP3384LGQ-Z?
For technical support, including MP3384LGQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3384LGQ-Z requirements.
6.How does Aetrix verify that MP3384LGQ-Z is sourced from the original manufacturer or authorized distributors?
All MP3384LGQ-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 MP3384LGQ-Z meets industry standards.
7.What is the process for return or replacement of MP3384LGQ-Z?
All MP3384LGQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3384LGQ-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 MP3384LGQ-Z part is unused and in its original packaging.
Return procedure for MP3384LGQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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