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Monolithic Power Systems Inc. MP3384LGQ-P
- Part No.:
- MP3384LGQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MP3384LGQ-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,425
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Product details
Overview
MP3384LGQ-P from Monolithic Power Systems is a 50V, 4-string white LED driver IC for LCD backlighting, featuring fixed-frequency boost conversion (625kHz/1.25MHz), 3V–25V input range, and four independent 20mA current sources with ±2.5% inter-string matching. It integrates open/short LED protection, programmable over-voltage protection, and PWM dimming control for tablet and notebook displays.
For engineers reviewing the MP3384LGQ-P datasheet, MP3384LGQ-P pinout, MP3384LGQ-P application, or MP3384LGQ-P equivalent, key selection criteria include its 600mV LED current-sense reference voltage, 1.2A internal MOSFET current limit, thermal shutdown at 150°C, and QFN-16 (3mm×3mm) package compatibility with high-density PCB layouts.
Technical Context
The MP3384LGQ-P implements peak-current-mode control with an internal 5V LDO (VCC) powering gate drive and logic circuits. Its feedback loop uses the lowest active LEDx pin voltage as the regulation reference, maintaining output voltage via a 600mV current-sense threshold across all strings.
It supports dual-frequency operation via the OSC pin (GND = 625kHz; floating/VCC = 1.25MHz), includes pulse-skipping at light loads, and employs dedicated comparators for LED open-circuit detection (180–235mV UVLO) and short-circuit fault latching (5.1–5.9V threshold, 1.3–1.9ms timer).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 25V - enables single-cell Li-ion (3.0V cutoff) or multi-cell battery operation in portable displays. |
| Max Boost Output Voltage | 50V - supports up to 10 white LEDs in series per string (VF ≈ 3.2V × 10 = 32V) with margin. |
| LED Current Accuracy | ±2.5% matching between strings - ensures uniform brightness across 4 independent backlight zones. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - balances inductor size (47µH vs. 22µH) and efficiency in space-constrained designs. |
| Current-Sense Voltage | 600mV - minimizes power loss in current-setting resistors and improves thermal performance. |
| Thermal Shutdown | 150°C - protects die integrity during sustained overload or poor heatsinking in sealed enclosures. |
| OVP Threshold Range | Programmable 48–102mV on OVP pin - sets open-string detection level relative to VOUT for fail-safe shutdown. |
Pinout & Package
The MP3384LGQ-P is housed in a thermally enhanced 3mm×3mm QFN-16 package with exposed pad connected to PGND. Pin 1 is marked by a dot or notch; the exposed thermal pad must be soldered to a PGND copper area for optimal thermal dissipation (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Control Input | Active-high logic input; requires external pull-up or MCU drive; no floating allowed. |
| 2 OSC | Frequency Selection | GND = 625kHz; floating or VCC = 1.25MHz - configures switching frequency without external clock. |
| 3 ISET | Current Programming Node | Connects to ground via RSET (e.g., 60.4kΩ → 20mA/string); sets all 4 LED currents identically. |
| 4 GND | Analog Ground Reference | Reference for internal error amplifier and analog circuitry; separate from PGND to reduce noise coupling. |
| 5 PWM | PWM Dimming Input | Accepts 100Hz–2kHz external PWM signal (1.5V min high-level) to control LED brightness duty cycle. |
| 6–9 LED1–LED4 | LED String Cathode Drivers | Open-drain outputs sinking current from LED string cathodes; each independently regulated and protected. |
| 10 OVP | Over-Voltage Protection Input | Monitors resistor-divider tap; triggers shutdown when voltage reaches 1.23V (e.g., 1.3×VOUT for open-string detection). |
| 12 PGND | Power Ground Return | High-current return path for SW node and LED sinks; must be low-inductance connection to exposed pad. |
| 13 SW | Internal MOSFET Drain | Switching node connecting to inductor and rectifier diode; swings from GND to 50V; critical for EMI layout. |
| 14 COMP | Error Amplifier Compensation | Connects RC network to GND to stabilize boost loop; determines phase margin and transient response. |
| 15 VCC | Internal 5V LDO Output | Powers gate driver and control logic; requires ≥1µF ceramic bypass capacitor to GND. |
| 16 VIN | Main Supply Input | 3V–25V input; requires local 4.7µF X5R/X7R ceramic bypass capacitor near pin. |
| 11 NC | No Connection | Not internally bonded; must remain unconnected and un-routed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 4-String Current Regulation | Four matched 20mA current sinks with 600mV sense voltage enable uniform backlighting without external op-amps. |
| Programmable Open-String Protection | OVP pin accepts resistor divider to set precise open-circuit detection threshold (e.g., 1.3×VOUT), preventing overvoltage damage. |
| Short-String Fault Latching | Detects LED shorts via >5.5V on LEDx pins and disables faulty string after 1.6ms, preserving remaining backlight functionality. |
| Thermal & UVLO Protection | Integrated 150°C shutdown and VCC UVLO (3V rising / 2.2V falling) ensure safe startup and sustained operation under thermal stress. |
| Low Quiescent Current | 1.8mA operating IQ and 2μA shutdown current extend battery life in always-on display applications. |
Applications
| Notebook Computers | Tablet Computers |
|---|---|
Use Scenario: Backlighting for 13–15.6-inch LCD panels with dynamic dimming. IC Role / Device Role / Timing Role: Primary boost LED driver regulating four parallel LED strings with PWM-controlled brightness. Use Value: Enables thin bezel design via compact QFN-16 footprint and eliminates need for external current mirrors or op-amps. | Use Scenario: Dual-battery powered 7–10-inch tablets requiring efficient single-cell operation down to 3.0V. IC Role / Device Role / Timing Role: Constant-current LED controller supporting 625kHz switching to minimize inductor size and EMI. Use Value: Maintains 20mA string current accuracy within ±2.5% across temperature, ensuring consistent screen luminance. |
| Digital Picture Frames | Hand-Held Terminal Displays |
Use Scenario: Always-on indoor displays with ambient light sensing and automatic brightness adjustment. IC Role / Device Role / Timing Role: LED driver accepting variable PWM input (100Hz–2kHz) for smooth, flicker-free dimming control. Use Value: Low 600mV current-sense voltage reduces power loss in current-setting resistors, improving thermal efficiency. | Use Scenario: Industrial handheld scanners and POS terminals with ruggedized LCDs and extended temperature operation. IC Role / Device Role / Timing Role: Fault-tolerant backlight controller with open/short LED detection and thermal shutdown. Use Value: Prevents system failure due to LED string faults by disabling only affected strings while maintaining partial illumination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3384AGQ-Z | Same pinout and function but rated for −40°C to +85°C industrial temp range (vs. −40°C to +125°C for MP3384LGQ-P) | Limited to non-automotive industrial use; lacks extended junction temperature rating | Select when full automotive-grade thermal margin is not required and cost optimization is prioritized. |
| RT9397BZSP | 4-string WLED driver with 1.2MHz fixed frequency, 30V max output, and 3% current matching; no programmable OVP | Requires external OVP circuitry; lower max output voltage limits LED count per string | Choose for simpler BOM where 30V output suffices and OVP flexibility is not needed. |
Compared with MP3384AGQ-Z and RT9397BZSP, the MP3384LGQ-P offers superior thermal resilience (125°C TJ), programmable OVP for robust open-string handling, and tighter 2.5% current matching-critical for high-end display uniformity.
Availability
MP3384LGQ-P is available at Aetrix Electronics and suitable for notebook computers, tablet computers, and hand-held terminal displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3384LGQ-P 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 mixed-signal ICs for power management, motion control, and interface applications.
The MP3384L product line delivers highly integrated, thermally robust LED drivers for LCD backlighting in portable and industrial displays, emphasizing efficiency, fault tolerance, and small-footprint design.
FAQ
What is the minimum input voltage required for MP3384LGQ-P to start up and regulate?
The MP3384LGQ-P requires VIN ≥ 3.0V to initiate operation, but startup also depends on VCC reaching its 3.0V UVLO rising threshold. When VIN < 5.5V, VCC must be tied to VIN; below 3.0V, the internal regulator cannot power control logic, and EN remains inactive.
How does the MP3384LGQ-P handle an open LED string during operation?
When an LED string opens, its corresponding LEDx pin voltage drops below 180mV. The device detects this as an open fault, disables that string, and continues regulating the remaining strings using the highest-voltage active LEDx pin as the feedback reference-maintaining partial backlight functionality.
Can the MP3384LGQ-P drive more than 10 LEDs per string?
No-maximum supported VOUT is 50V. At typical white LED forward voltage of 3.2V, 15 LEDs would require 48V, leaving only 2V margin. Exceeding 50V risks triggering OVP or damaging internal components; 10–12 LEDs per string is the practical limit with safety margin.
What is the purpose of the exposed thermal pad on the QFN-16 package?
The exposed pad is electrically and thermally connected to PGND. It must be soldered to a dedicated PGND copper pour to achieve θJA = 60°C/W. Omitting this connection raises junction temperature by >30°C under full load, risking premature thermal shutdown or reliability degradation.
Is PWM dimming compatible with analog dimming on the MP3384LGQ-P?
No-the MP3384LGQ-P supports only PWM dimming via the dedicated PWM pin. There is no analog dimming capability (e.g., ISET voltage modulation or DC bias control); brightness control is exclusively achieved by varying the external PWM signal's duty cycle (100Hz–2kHz).
What happens if the ISET pin is left floating?
Leaving ISET floating causes undefined LED current regulation. The internal current mirror reference becomes unstable, resulting in unpredictable or zero LED current. The datasheet explicitly prohibits floating ISET; it must be connected to ground through a precision resistor (e.g., 60.4kΩ for 20mA).
Does the MP3384LGQ-P support synchronization to an external clock?
No-it has no external sync input. Frequency is fixed at either 625kHz or 1.25MHz, selected solely by the OSC pin state (GND or floating/VCC). External clock injection or spread-spectrum modulation is not supported.
MP3384LGQ-P 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-P FAQ
1.How can I place an order for MP3384LGQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3384LGQ-P 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-P reliable?
The price and inventory of MP3384LGQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3384LGQ-P is usually 5 days.
3.What payment methods are accepted for MP3384LGQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3384LGQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3384LGQ-P?
MP3384LGQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3384LGQ-P 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-P?
For technical support, including MP3384LGQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3384LGQ-P requirements.
6.How does Aetrix verify that MP3384LGQ-P is sourced from the original manufacturer or authorized distributors?
All MP3384LGQ-P 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-P meets industry standards.
7.What is the process for return or replacement of MP3384LGQ-P?
All MP3384LGQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3384LGQ-P, 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-P part is unused and in its original packaging.
Return procedure for MP3384LGQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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