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Monolithic Power Systems Inc. MP3386DR-LF-Z
- Part No.:
- MP3386DR-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3386DR-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,515
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Product details
Overview
MP3386DR-LF-Z from Monolithic Power Systems is a 6-channel, current-mode step-up white LED driver IC designed for large LCD panel backlighting. It delivers up to 50V output from 4.5–25V input, regulates six independent LED strings with ±3% current matching, and supports selectable 1.25MHz/625kHz switching frequency. Used in notebook PCs and automotive displays where precise brightness control and thermal robustness are critical.
For engineers reviewing the MP3386DR-LF-Z datasheet, MP3386DR-LF-Z pinout, MP3386DR-LF-Z application, or MP3386DR-LF-Z equivalent, this page provides verified technical context, real-world dimming implementation details, package-specific layout guidance, and validated alternative part comparisons for backlight power design.
Technical Context
The MP3386DR-LF-Z integrates a fixed-frequency current-mode boost converter with six matched open-drain current sinks. Its internal 5V LDO (VCC) powers gate drivers and control logic, while the COMP pin enables loop compensation via external RC networks. The device uses peak-current mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle.
Dimming is implemented via dual-path PWM: external PWM on PWMI is filtered through an internal 400kΩ resistor and external capacitor at PWMO to generate a DC-equivalent control voltage, or direct DC voltage (0.2–1.2V) applied to PWMO sets dimming duty cycle with negative polarity. DPWM frequency is set by CFSET using fDPWM = 3.5µF / CFSET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 25V - Supports wide-range industrial and automotive supply rails without pre-regulation. |
| Max Output Voltage | 50V - Enables driving up to 14–16 white LEDs in series per string at typical forward voltage. |
| LED String Count | 6 independent strings - Provides full-array backlight uniformity for 10–17" LCD panels. |
| Current Matching Accuracy | ±3% between strings - Ensures consistent luminance across display zones without optical compensation. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - Balances inductor size (22µH vs. 10µH) and EMI performance. |
| Regulation Voltage (VLEDX) | 600mV - Minimizes conduction loss in current sinks, improving efficiency at high LED currents. |
| OVP Threshold | Programmable via resistor divider to 1.23V reference - Enables safe overvoltage protection aligned with max LED string voltage. |
Pinout & Package
MP3386DR-LF-Z is housed in a thermally enhanced QFN24 (4mm × 4mm) package with exposed thermal pad connected to GND. The 24-pin layout supports compact, high-density PCB designs with low-inductance PGND1/PGND2 routing and dedicated SW1/SW2 parallel switch outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable Control Input | Active-high logic input; must be pulled high (>2.0V) to activate device; floating not allowed. |
| OSC (Pin 2) | Frequency Selection | Connect to GND for 625kHz; float or tie to VCC for 1.25MHz - selects inductor size and EMI profile. |
| FSET (Pin 3) | DPWM Frequency Set | Connect capacitor to GND; sets internal dimming PWM frequency (100Hz–2kHz) via fDPWM = 3.5µF/CFSET. |
| PWMO (Pin 4) | PWM Filter Output / DC Dimming Input | Accepts filtered PWM-derived DC (0.2–1.2V) or direct analog dimming voltage; negative polarity control. |
| GND (Pin 5) | Analog Ground Reference | Separate from PGND; used for signal references and compensation network return path. |
| PWMI (Pin 6) | PWM Signal Input | Accepts external 100Hz–50kHz square wave; internally filtered to generate dimming DC level when PWMO is configured. |
| LED1–LED6 (Pins 7–13) | LED String Cathode Outputs | Open-drain current sinks; each regulates one LED string; short to VOUT if unused. |
| ISET (Pin 11) | Current Programming Input | Tie external resistor RSET to GND; sets all string current as ILED = 1.21V / RSET. |
| VOUT (Pin 15) | Boost Output Node | Main high-voltage rail feeding all LED anodes; connects to Schottky rectifier and output capacitor. |
| OVP (Pin 16) | Over-Voltage Protection Sense | Resistor divider from VOUT to GND sets OVP threshold; triggers shutdown when pin reaches 1.23V. |
| PGND1/PGND2 (Pins 17–18) | Power Ground Returns | High-current ground paths for boost switch; must be shorted externally and routed separately from AGND. |
| SW1/SW2 (Pins 19–20) | Internal MOSFET Drain Outputs | Parallel-connected switch nodes; drive external inductor and rectifier; swing from GND to 50V. |
| VFAULT (Pin 21) | Fault Disconnection Driver | Drives external PMOS to isolate input during fault conditions (OVP, OTP, UVLO, open/short LED). |
| COMP (Pin 22) | Error Amplifier Compensation | Connect RC network to GND to stabilize feedback loop; critical for transient response and stability. |
| VIN (Pin 23) | Main Supply Input | 4.5–25V input powering both IC logic and boost converter; requires local ceramic bypass capacitor. |
| VCC (Pin 24) | Internal 5V LDO Output | Supplies gate drivers and internal circuitry; drops to 0V in shutdown; bypass with ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| 6-string current balancing | ±3% matching accuracy ensures uniform backlight brightness without software correction. |
| Low 600mV LED sink voltage | Reduces power dissipation in current regulation path, enabling >90% system efficiency at 20mA/string. |
| Dual-mode PWM dimming | Supports both external PWM (PWMI) and direct DC analog (PWMO) inputs - eliminates audible noise in sensitive environments. |
| Comprehensive fault protection | Integrated open-string detection (via LEDX UVLO), short-string protection (LEDX OV), OVP, UVLO, and thermal shutdown. |
| Flexible frequency selection | Hardware-selectable 625kHz/1.25MHz operation allows optimization of magnetics size, efficiency, and EMI compliance. |
Applications
| Notebook PC Backlight | Automotive Infotainment Display |
|---|---|
|
Use Scenario: Driving 6 parallel LED strings behind a 13.3" IPS LCD panel in battery-powered ultrabook. IC Role / Device Role / Timing Role: Primary boost LED driver with integrated current regulation and PWM dimming control for adaptive brightness. Use Value: 600mV regulation voltage minimizes heat generation in thin chassis; 1.25MHz switching enables <2mm height inductor placement. |
Use Scenario: Backlighting a 10.1" automotive-grade LCD in instrument cluster with temperature range −40°C to +105°C ambient. IC Role / Device Role / Timing Role: High-reliability LED driver with open/short LED fault detection and thermal shutdown for ASIL-B compatible systems. Use Value: ±3% current matching maintains display uniformity across operating life; programmable OVP prevents overvoltage stress during load dump events. |
| Small LCD TV Backlight | Industrial Tablet Computer |
|
Use Scenario: Powering 6-string WLED array in 24" commercial LCD monitor with 10,000-hour MTBF requirement. IC Role / Device Role / Timing Role: Constant-current LED driver with DC-input PWM dimming for flicker-free video playback and ambient light adaptation. Use Value: Direct 0.2–1.2V DC dimming on PWMO eliminates external microcontroller PWM filtering components and reduces BOM count. |
Use Scenario: Enabling ruggedized 8" tablet display with glove-touch capability and sunlight-readable brightness (1000+ cd/m²). IC Role / Device Role / Timing Role: High-efficiency boost driver supporting dynamic contrast enhancement via synchronized DPWM dimming. Use Value: Selectable 625kHz frequency improves efficiency at high input voltages (e.g., 24V PoE-powered systems); PGND1/PGND2 separation reduces ground bounce in noisy industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3384GQ-Z | 4-string version; same 50V/25V specs but fewer channels and smaller QFN16 package. | Limited to smaller displays (<10") requiring only 4 LED strings; lacks LED6/LED5 pins and associated protection logic. | Select when display size and LED count allow channel reduction - saves board area and cost without sacrificing efficiency. |
| RT9397BZSP | 6-string driver with 40V max output, 300kHz fixed frequency, and no selectable OSC pin or FSET-programmable DPWM. | Lower max output voltage restricts LED count per string; fixed frequency limits EMI flexibility; no DC dimming on PWMO. | Choose only if 40V output suffices and design prioritizes lowest component count over dimming flexibility and thermal margin. |
Compared with MP3386DR-LF-Z, MP3384GQ-Z reduces channel count and footprint for smaller displays, while RT9397BZSP trades programmability and voltage headroom for simplicity - neither matches the 50V capability, 3% matching, or dual-mode dimming of the MP3386DR-LF-Z in demanding backlight applications.
Availability
MP3386DR-LF-Z is available at Aetrix Electronics and suitable for notebook PC backlighting, automotive infotainment displays, and industrial tablet computers requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3386DR-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP3386 belongs to MPS's high-voltage LED driver product line, engineered specifically for large-format LCD backlighting where precision current matching, thermal resilience, and flexible dimming are mandatory.
FAQ
What is the minimum recommended RSET value for MP3386DR-LF-Z?
The minimum RSET is determined by maximum per-string current of 30mA (per datasheet). Using ILED = 1.21V / RSET, RSET = 1.21V / 0.03A = 40.3kΩ. A 40.2kΩ resistor achieves nominal 30mA; lower values risk exceeding absolute max ratings and thermal limits.
Can MP3386DR-LF-Z operate with VIN below 5.5V?
Yes - when VIN < 5.5V, the internal VCC LDO cannot regulate. In that case, connect an external 5V supply directly to the VCC pin and tie VIN to the same source or bypass it. This configuration avoids UVLO lockout and ensures gate driver functionality.
How does open-string protection work on MP3386DR-LF-Z?
When an LED string opens, its LEDX pin voltage drops below 175mV (UVLO threshold). The IC detects this, marks off the faulty string, and continues regulating remaining strings using the highest-voltage active string as reference. All marked-off strings remain disabled until reset.
Is the exposed thermal pad on QFN24 electrically connected?
Yes - the exposed pad is internally bonded to GND. It must be soldered to a solid GND copper pour on the PCB for thermal conduction and electrical integrity. Thermal resistance θJA is specified at 42°C/W assuming proper pad connection and 4-layer board layout.
What happens if both SW1 and SW2 are not shorted externally?
Failure to short SW1 and SW2 violates the internal power switch architecture. The device may exhibit erratic switching, excessive heating, or failure to start. The datasheet explicitly requires external shorting to ensure balanced current sharing and correct gate drive timing.
Does MP3386DR-LF-Z support analog (DC) dimming without external components?
Yes - applying 0.2–1.2V DC directly to PWMO enables analog dimming with no external filter components. Voltages below 0.2V force 100% duty cycle; above 1.2V forces 0%. No capacitor on PWMO or FSET is required in this mode, simplifying layout.
What is the purpose of the VFAULT pin in normal operation?
VFAULT drives an external PMOS to connect/disconnect the input supply. During startup, it ramps slowly to limit inrush; during faults (OVP, OTP, UVLO), it pulls low to turn off the PMOS and isolate VIN from the system - preventing damage and enabling safe restart.
MP3386DR-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-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:
- 6
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MP3386DR-LF-Z FAQ
1.How can I place an order for MP3386DR-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3386DR-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 MP3386DR-LF-Z reliable?
The price and inventory of MP3386DR-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 MP3386DR-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3386DR-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3386DR-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3386DR-LF-Z?
MP3386DR-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3386DR-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 MP3386DR-LF-Z?
For technical support, including MP3386DR-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3386DR-LF-Z requirements.
6.How does Aetrix verify that MP3386DR-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3386DR-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 MP3386DR-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3386DR-LF-Z?
All MP3386DR-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3386DR-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 MP3386DR-LF-Z part is unused and in its original packaging.
Return procedure for MP3386DR-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP3386DR-LF-Z Tags
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