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Monolithic Power Systems Inc. MP3384EQ-LF-Z
- Part No.:
- MP3384EQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MP3384EQ-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 40MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
MP3384EQ-LF-Z from Monolithic Power Systems is a 4-channel, current-mode step-up white LED driver IC for large LCD panel backlighting. It delivers up to 50V output from 4.5–25V input, regulates four independent LED strings with 2.5% current matching accuracy, and supports selectable 1.25MHz/625kHz switching frequency. Used in notebook PC and automotive display systems requiring precise, high-efficiency LED current control.
For engineers reviewing the MP3384EQ-LF-Z datasheet, MP3384EQ-LF-Z pinout, MP3384EQ-LF-Z application, or MP3384EQ-LF-Z equivalent, key selection criteria include its 600mV LED current-sense voltage, open/short LED protection timing (1.6ms fault detection), PWM dimming compatibility (100Hz–2kHz), and QFN16 thermal performance (θJA = 60°C/W).
Technical Context
The MP3384EQ-LF-Z integrates a fixed-frequency peak-current-mode boost converter with four matched internal current sinks. Its regulation loop uses a 600mV reference across each LED string's current source, enabling tight current matching without external sensing resistors per channel.
Protection logic includes programmable OVP via resistor divider on the OVP pin (1.23V threshold), open-string detection via LEDX pin voltage monitoring (<180mV), and short-string detection (>5.5V on LEDX), with fault latching until restart. Thermal shutdown activates at 150°C with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 25V - Supports wide-range DC supplies including 5V, 12V, and 19V laptop rails. |
| Max Output Voltage | 50V - Sufficient to drive up to 10 white LEDs (3.2V each) in series per string. |
| LED Current Accuracy | ±2.5% matching between strings - Ensures uniform brightness across multi-string LCD backlights. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - Enables trade-off between inductor size (22µH vs 47µH) and EMI profile. |
| Current Sense Voltage | 600mV - Low dropout improves efficiency by minimizing power loss in current sources. |
| PWM Dimming Range | 100Hz to 2kHz - Compatible with standard backlight controllers and avoids audible noise. |
| Thermal Shutdown | 150°C with hysteresis - Protects against sustained overload while allowing recovery after cooling. |
Pinout & Package
MP3384EQ-LF-Z is housed in a thermally enhanced 3mm × 3mm QFN16 package with exposed pad connected to PGND. The package supports high-power density layout and meets JEDEC MO-220 VEED-4 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Control Input | Active-high logic input; must be pulled high (≥1.8V) to activate device; floating not allowed. |
| 2 OSC | Frequency Selection | Connect to GND for 625kHz; float or tie to VCC for 1.25MHz - sets oscillator frequency without external components. |
| 3 ISET | Current Programming | Accepts external resistor to GND; sets all four LED currents via ILED = 1210V / RSET (e.g., 60.4kΩ → 20mA). |
| 4 GND | Analog Ground Reference | Reference node for internal error amplifier and analog circuitry; separate from PGND but tied externally. |
| 5 PWM | PWM Dimming Input | Directly controls LED current duty cycle; accepts 1.5V–5V logic signal; minimum pulse width defined by internal timing. |
| 6–9 LED1–LED4 | LED String Cathode Outputs | Open-drain current sinks; each drives one LED string cathode; internally regulated to 600mV compliance voltage. |
| 10 OVP | Over-Voltage Protection Input | Monitors output via resistor divider; triggers shutdown when voltage exceeds 1.23V × (R1+R2)/R2 threshold. |
| 12 PGND | Power Ground | High-current return path for boost switch; exposed pad must be soldered to PCB thermal pad and connected to PGND. |
| 13 SW | Boost Switch Node | Drain of internal MOSFET; swings from GND to 50V; connects to inductor and Schottky diode anode. |
| 14 COMP | Loop Compensation | Output of internal error amplifier; requires RC network to GND for stable regulation across load/transient conditions. |
| 15 VCC | Internal LDO Output | 5V ±5% regulated supply for gate driver and logic; sourced from VIN if >5.5V; bypass with ≥1µF ceramic capacitor. |
| 16 VIN | Main Power Input | Primary supply rail; requires local 4.7µF ceramic decoupling; UVLO activates below 4.1V (rising edge). |
Key Features
| Feature | Design Value |
|---|---|
| 4-String Current Matching | 2.5% max deviation between strings ensures consistent backlight luminance without per-string calibration. |
| Low 600mV Compliance Voltage | Reduces conduction loss in current sources, improving system efficiency by ~3–5% versus 1V+ alternatives. |
| Programmable OVP Threshold | Configurable via external resistor divider on OVP pin - enables safe margin setting (e.g., 1.3× nominal VOUT). |
| Integrated Open/Short LED Detection | Detects open strings (<180mV on LEDX) and short strings (>5.5V on LEDX) with 1.6ms fault timer - prevents overvoltage damage. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C and re-enables only after die cools below ~135°C - prevents thermal cycling during overload. |
Applications
| Notebook PC Backlight | Automotive Infotainment Display |
|---|---|
|
Use Scenario: Driving 4 parallel strings of 8–10 white LEDs behind 13–15.6-inch LCD panels in portable computing devices. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages PWM dimming synchronization and string fault isolation. Use Value: Enables uniform brightness, flicker-free dimming, and robust fault handling without external current-sense amplifiers. |
Use Scenario: Backlighting TFT displays in automotive head units and digital instrument clusters operating across -40°C to +105°C ambient. IC Role / Device Role / Timing Role: High-reliability LED driver with integrated thermal and open/short protection - critical for AEC-Q200-aligned designs. Use Value: Eliminates need for discrete protection circuitry and reduces BOM count while meeting automotive transient and lifetime requirements. |
| Digital Picture Frame | Handheld Terminal Display |
|
Use Scenario: Powering compact, battery-operated 7–10 inch LCD frames with minimal heat generation and long runtime. IC Role / Device Role / Timing Role: Efficient boost + current regulation IC supporting low-input-voltage operation (down to 4.5V) and light-load pulse-skipping mode. Use Value: Extends battery life via 2μA shutdown current and maintains brightness consistency across varying battery voltage. |
Use Scenario: Illuminating ruggedized industrial handhelds with variable ambient lighting and frequent on/off cycling. IC Role / Device Role / Timing Role: Fault-tolerant LED driver that auto-detects and disables failed strings while maintaining partial backlight functionality. Use Value: Increases field reliability by preventing single-string failure from disabling entire display backlight. |
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 |
|---|---|---|---|
| RT9397BZSP | Fixed 1MHz switching frequency; no frequency select pin; 3.5% current matching; 700mV sense voltage. | Lacks OSC pin flexibility and has higher compliance loss; requires tighter thermal design at same output power. | Prefer MP3384EQ-LF-Z when board space is constrained and 625kHz operation is needed for lower EMI. |
| LM3409QMY/NOPB | Single-string buck-boost LED driver; requires external current sources and protection logic for multi-string use. | Not a drop-in replacement - demands additional ICs and layout complexity to achieve 4-string operation. | MP3384EQ-LF-Z reduces total solution size and component count by integrating all four current sources and protections. |
Compared with RT9397BZSP and LM3409QMY/NOPB, MP3384EQ-LF-Z delivers superior integration (single-chip 4-string control), lower thermal overhead (600mV vs 700mV sense), and flexible frequency selection - directly reducing bill-of-materials and layout validation effort.
Availability
MP3384EQ-LF-Z is available at Aetrix Electronics and suitable for notebook PC backlighting, automotive infotainment displays, and digital picture frame designs requiring stable component supply, RoHS-compliant packaging, and production-ready lead times.
Supply support for MP3384EQ-LF-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 MP3384 belongs to MPS's WLED backlight driver product line, engineered specifically for high-efficiency, multi-string LCD panel illumination in space-constrained consumer and automotive applications.
FAQ
What is the minimum input voltage required to start up the MP3384EQ-LF-Z?
The MP3384EQ-LF-Z features under-voltage lockout with a rising-edge threshold of 4.1V (typical). Startup occurs only when VIN exceeds this value; hysteresis of 200mV ensures stable enable/disable behavior during brown-out conditions. Below 3.6V, the device remains fully disabled.
Can the MP3384EQ-LF-Z drive more than 10 LEDs per string?
No - the maximum output voltage is 50V, and typical forward voltage for white LEDs is 2.8–3.6V. At 3.2V per LED, 15 LEDs would require 48V, leaving only 2V margin for current-source compliance and diode drop. Design margin and temperature derating limit practical use to ≤14 LEDs per string.
How does the MP3384EQ-LF-Z handle a single open LED string?
When one string opens, its LEDX pin voltage drops below 180mV. The IC detects this within 1.6ms, marks off the faulty string, and continues regulating remaining strings using the highest-voltage active string as the reference. Output voltage adjusts downward to match the new minimum requirement.
Is an external Schottky diode required for the boost stage?
Yes - the MP3384EQ-LF-Z integrates only the high-side MOSFET switch (SW pin). An external Schottky diode (e.g., DFLS160) is mandatory between SW and VOUT to complete the boost rectification path and prevent reverse current flow during switch-off periods.
What is the purpose of the exposed thermal pad on the QFN16 package?
The exposed pad is internally connected to PGND and serves as the primary thermal conduction path. It must be soldered to a dedicated PCB copper pour tied to PGND to achieve the specified θJA of 60°C/W; omitting this connection degrades thermal performance by >30°C/W.
Does the MP3384EQ-LF-Z support analog dimming in addition to PWM?
No - the MP3384EQ-LF-Z supports only PWM dimming via the dedicated PWM pin. Analog dimming (current adjustment via ISET) is not supported during operation; ISET sets a fixed current value at startup and remains static unless physically changed.
What happens if the OSC pin is left unconnected?
Leaving the OSC pin floating configures the internal oscillator for 1.25MHz operation - identical to connecting it to VCC. This is a defined state per datasheet; however, for production reliability, MPC recommends tying OSC to VCC or GND with a 10kΩ resistor to avoid noise susceptibility.
MP3384EQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 40mA
- 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)
MP3384EQ-LF-Z FAQ
1.How can I place an order for MP3384EQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3384EQ-LF-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 MP3384EQ-LF-Z reliable?
The price and inventory of MP3384EQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3384EQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3384EQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3384EQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3384EQ-LF-Z?
MP3384EQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3384EQ-LF-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 MP3384EQ-LF-Z?
For technical support, including MP3384EQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3384EQ-LF-Z requirements.
6.How does Aetrix verify that MP3384EQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3384EQ-LF-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 MP3384EQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3384EQ-LF-Z?
All MP3384EQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3384EQ-LF-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 MP3384EQ-LF-Z part is unused and in its original packaging.
Return procedure for MP3384EQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP3384EQ-LF-Z Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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