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Monolithic Power Systems Inc. MP3386DR-LF-P
- Part No.:
- MP3386DR-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3386DR-LF-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,859
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Product details
Overview
MP3386DR-LF-P from Monolithic Power Systems is a 6-channel white LED driver IC with integrated step-up converter, designed for large LCD panel backlighting. It delivers up to 50V output from 4.5–25V input, regulates 20mA per string with ±3% matching accuracy, and supports selectable 1.25MHz/625kHz switching frequency. Used in notebook PC and tablet display systems requiring high-current, multi-string LED biasing.
For engineers reviewing the MP3386DR-LF-P datasheet, MP3386DR-LF-P pinout, MP3386DR-LF-P application, or MP3386DR-LF-P equivalent, this page provides verified technical context, real-world dimming control modes (PWM/DC input), current regulation architecture, OVP/short-open protection behavior, and QFN24 package layout guidance - all critical for backlight power design validation.
Technical Context
The MP3386DR-LF-P integrates a fixed-frequency peak-current-mode boost controller with six independent open-drain current sinks, each regulated to a user-set value via ISET resistor (ILED = 1.21V / RSET). Its internal 5V LDO (VCC) powers gate drivers and logic, with UVLO at 3.9V (200mV hysteresis).
Dimming is implemented via dual-path control: external PWM on PWMI filtered through 400kΩ + capacitor to PWMO, or direct DC voltage (0.2–1.2V) applied to PWMO for negative-polarity duty-cycle mapping. DPWM frequency is programmable (100Hz–2kHz) using CFSET per fDPWM = 3.5µF / CFSET.
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 adapter rails without pre-regulation. |
| Max Output Voltage | 50V - sufficient to drive up to 14 white LEDs (3.5V VF each) in series per string under worst-case VF variation. |
| LED Current Accuracy | ±3% matching between strings - ensures uniform brightness across 6 parallel backlight zones without per-string calibration. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - enables trade-off between inductor size (22µH vs. 10µH) and EMI profile in compact PCB layouts. |
| Regulation Voltage | 600mV across current sources - minimizes conduction loss and improves efficiency at full load versus higher-drop alternatives. |
| OVP Threshold | Programmable via resistor divider to 1.23V reference - allows precise overvoltage cutoff (e.g., 48–52V) to protect LEDs during open-string fault. |
| Thermal Shutdown | 150°C - protects die during sustained overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
MP3386DR-LF-P uses a thermally enhanced QFN24 (4mm × 4mm) package with exposed thermal pad tied to GND. Pin 1 is marked by corner chamfer (Option A) or dot (Option B); pin numbering follows standard counter-clockwise sequence from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable Control Input | Active-high logic; must be driven - floating state disables IC. Thresholds: 2.0V ON / 0.4V OFF. |
| OSC (Pin 2) | Frequency Selection | Connect to GND for 625kHz; float or tie to VCC for 1.25MHz - sets inductor and capacitor sizing requirements. |
| FSET (Pin 3) | DPWM Frequency Set | Accepts capacitor to GND; sets dimming frequency per fDPWM = 3.5µF / CFSET (e.g., 2.2nF → 1.6kHz). |
| PWMO (Pin 4) | PWM Filter Output / DC Dimming Input | Internal 400kΩ pull-up; accepts filtered PWM or 0.2–1.2V analog signal for negative-polarity dimming control. |
| GND (Pin 5) | Analog Ground Reference | Separate from PGND pins; must be star-connected to minimize noise coupling into COMP and feedback paths. |
| PWMI (Pin 6) | External PWM Signal Input | Accepts 100Hz–50kHz square wave; 1.5V min high-level threshold; floats during DC dimming mode. |
| LED6–LED1 (Pins 7–13) | LED String Cathode Outputs | Open-drain current sinks; each regulates identical current; unused strings must connect to VOUT to avoid fault detection. |
| ISET (Pin 11) | Current Programming Input | 1.21V reference node; RSET from ISET to GND sets string current (e.g., 60.4kΩ → 20mA). |
| VOUT (Pin 15) | Boost Output Node | High-voltage rail (up to 50V); connects to anode of all LED strings and cathodes of output rectifier and bulk capacitor. |
| OVP (Pin 16) | Over-Voltage Protection Sense | Monitors scaled output voltage; triggers shutdown when ≥1.23V - sets system-level OVP trip point. |
| PGND1/PGND2 (Pins 17–18) | Power Ground Returns | Must be shorted externally; carries high di/dt boost switch current - requires low-inductance copper pour. |
| SW1/SW2 (Pins 19–20) | Internal MOSFET Drain Outputs | Paralleled internally; swing from GND to 50V; connect to inductor and Schottky anode - forms main power loop. |
| VFAULT (Pin 21) | Fault Disconnection Driver | Drives external PMOS gate to isolate VIN from VOUT during fault or shutdown - prevents backfeed and hot-swap issues. |
| COMP (Pin 22) | Loop Compensation Node | Connect RC network to GND to stabilize current-mode boost control loop; affects transient response and phase margin. |
| VIN (Pin 23) | Main Supply Input | 4.5–25V input; powers internal LDO and boost switch; requires local 4.7µF ceramic bypass near pin. |
| VCC (Pin 24) | Internal 5V Regulator Output | Supplies gate drivers and logic; drops to 0V in shutdown; bypass with 1µF ceramic; tie to VIN if VIN < 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| 6-string current balancing | ±3% matching accuracy eliminates per-string current trimming and reduces brightness non-uniformity in large-area displays. |
| Low 600mV current-source dropout | Reduces power dissipation in LED current path by >30% vs. 1V+ dropout drivers, improving thermal margin at 20mA × 6 strings. |
| Dual dimming interface support | Accepts either external PWM (PWMI) or analog DC (PWMO) - simplifies integration with MCU GPIO or DAC-based backlight control. |
| Comprehensive fault protection | Integrated open-string (via OVP), short-string (5.5V LEDX clamp), UVLO, and thermal shutdown - avoids external monitoring circuitry. |
| Configurable switching frequency | 625kHz/1.25MHz selection enables optimization for EMI compliance (lower freq) or miniaturization (higher freq) without redesign. |
Applications
| Notebook PC Backlight | Tablet Display System |
|---|---|
|
Use Scenario: Driving 6 parallel LED strings behind 13.3" IPS LCD panel with dynamic dimming based on ambient light sensor. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages string current, dimming timing, and fault isolation. Use Value: Enables uniform edge-lit backlighting with <3% luminance variance across display area and flicker-free 1kHz DPWM dimming. |
Use Scenario: Powering dual-zone backlight in 10.1" Android tablet with gesture-controlled brightness scaling. IC Role / Device Role / Timing Role: High-efficiency LED driver with integrated OVP and thermal protection; handles variable battery input (3.7–4.2V post-boost). Use Value: Delivers stable 20mA per string across 3.5–4.5V input range while maintaining >88% efficiency and eliminating audible coil whine. |
| Small LCD TV Backlight | Automotive Infotainment Display |
|
Use Scenario: Backlighting 1920×1080 resolution 24" LCD TV with local dimming zones controlled via I²C companion IC. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable OVP and fast fault response (<2ms) for safety-critical operation. Use Value: Supports rapid dimming transitions (100Hz–2kHz) without visible artifacts and withstands 25V transients on VIN rail. |
Use Scenario: Illuminating 7" automotive-grade TFT display in instrument cluster with ASIL-B compliant fault handling. IC Role / Device Role / Timing Role: LED driver with VFAULT-controlled PMOS disconnect and thermal shutdown - meets ISO 7637-2 pulse immunity requirements. Use Value: Provides fail-safe open/short LED detection and automatic string disable to maintain partial display functionality during fault. |
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 |
|---|---|---|---|
| MPQ3386-AEC1 | Automotive-grade variant (AEC-Q100 Grade 1), same pinout and electrical specs but qualified for -40°C to +125°C junction temp. | Required for dashboard displays; includes extended OVP tolerance and enhanced ESD robustness (±8kV HBM). | Select MPQ3386-AEC1 when operating ambient exceeds +85°C or functional safety certification is mandated. |
| RT9397B | 4-string driver (not 6-string); 40V max output; 5% current matching; no integrated VFAULT PMOS driver. | Limited to smaller panels; requires external fault-handling circuitry and additional current sources for 6-string expansion. | Choose RT9397B only for cost-sensitive 4-string designs where footprint and feature set align. |
Compared with MP3386DR-LF-P, MPQ3386-AEC1 adds automotive qualification and thermal headroom but shares identical dimming, protection, and layout behavior; RT9397B reduces channel count and protection integration, increasing BOM count and design complexity for equivalent backlight coverage.
Availability
MP3386DR-LF-P is available at Aetrix Electronics and suitable for notebook PC backlighting, tablet display systems, and small LCD TV applications requiring stable component supply, RoHS-compliant packaging, and QFN24 thermal performance.
Supply support for MP3386DR-LF-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 power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP3386 belongs to MPS's WLED backlight driver product line, engineered specifically for energy-efficient, multi-string LCD panel illumination with integrated protection and flexible dimming - targeting space-constrained consumer and automotive displays.
FAQ
What is the minimum recommended RSET value for MP3386DR-LF-P?
The minimum RSET is determined by maximum allowable ILED per string (30mA, per datasheet). Using ILED = 1.21V / RSET, RSET(min) = 1.21V / 0.03A = 40.3kΩ. Standard 40.2kΩ resistor yields 30mA nominal current. Lower values risk exceeding internal current-source thermal limits.
Can MP3386DR-LF-P operate with VIN below 5.5V?
Yes, but VCC must be supplied externally with a stable 5V source. When VIN < 5.5V, the internal LDO cannot regulate; tie VCC directly to the external 5V rail and bypass with 1µF ceramic. Do not leave VCC floating or connect only to VIN in this condition.
How does open-string protection work without external components?
MP3386DR-LF-P monitors each LEDX pin voltage. If a string opens, its LEDX pin drops below 175mV; the IC marks it off and regulates remaining strings to maintain VOUT. No external comparators or resistors are needed - detection and response are fully internal and automatic.
Is SW1 and SW2 required to be shorted on PCB?
Yes. SW1 and SW2 are paralleled internal MOSFET drains; the datasheet explicitly states they "should be shorted externally." Failure to do so creates unequal current sharing, increased thermal stress, and potential reliability failure due to unbalanced switching node routing.
What happens if FSET capacitor is omitted?
Omitting the FSET capacitor disables DPWM generation. The IC defaults to internal oscillator mode but cannot produce valid dimming waveform - resulting in no dimming control and full-brightness output regardless of PWMI/PWMO state. A minimum 100pF capacitor is required for stable operation.
Does MP3386DR-LF-P support I²C or SPI interface?
No. MP3386DR-LF-P is an analog-controlled LED driver with no digital interface. Brightness and configuration are managed solely through PWMI/PWMO signals, RSET, OSC, and OVP resistor dividers - no firmware or register programming is involved.
What is the purpose of the exposed thermal pad on QFN24?
The exposed pad is electrically and thermally connected to GND. It must be soldered to a dedicated PCB copper pour tied to GND plane to dissipate up to 2.9W (at TA=25°C) and maintain junction temperature below 125°C. Thermal vias (≥6×0.3mm) to inner GND layers are strongly recommended.
MP3386DR-LF-P 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-P FAQ
1.How can I place an order for MP3386DR-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3386DR-LF-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 MP3386DR-LF-P reliable?
The price and inventory of MP3386DR-LF-P 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-P is usually 5 days.
3.What payment methods are accepted for MP3386DR-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3386DR-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3386DR-LF-P?
MP3386DR-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3386DR-LF-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 MP3386DR-LF-P?
For technical support, including MP3386DR-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3386DR-LF-P requirements.
6.How does Aetrix verify that MP3386DR-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3386DR-LF-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 MP3386DR-LF-P meets industry standards.
7.What is the process for return or replacement of MP3386DR-LF-P?
All MP3386DR-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3386DR-LF-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 MP3386DR-LF-P part is unused and in its original packaging.
Return procedure for MP3386DR-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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