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Monolithic Power Systems Inc. MP3389EY-LF-P
- Part No.:
- MP3389EY-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3389EY-LF-P.pdf
- Description:
- HIGH VOLTAGE, 12-STRING BOOST WL
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
MP3389EY-LF-P from Monolithic Power Systems is a 12-string, step-up white LED driver IC designed for large LCD panel backlighting. It integrates a current-mode, fixed-frequency boost controller with 12 matched internal current sinks (±2.5% matching), supports 5V–28V input, delivers up to 60mA per string, and regulates LED current via an external ISET resistor (1.22V reference). Used in LCD TVs and flat-panel monitors requiring uniform brightness across high-channel-count WLED arrays.
For engineers reviewing the MP3389EY-LF-P datasheet, MP3389EY-LF-P pinout, MP3389EY-LF-P application, or MP3389EY-LF-P equivalent, key selection criteria include programmable switching frequency (100–500 kHz), dual PWM/DC dimming control, open/short LED protection, OVP threshold programming, and thermal shutdown behavior at 130°C.
Technical Context
The MP3389EY-LF-P implements a peak-current-mode step-up converter with external N-MOSFET drive (GATE pin) and 12 independent open-drain LED current sinks (LED1–LED12). Its internal 5V LDO (VCC) powers control circuitry and gate drivers, while the 1.22V ISET reference enables precise current setting (ILED = 1220V / RSET). The device uses a 1.23V OVP comparator and monitors LEDX pin voltages (140–220 mV UVLO, 5.1–5.9 V OV) for fault detection.
Dimming is implemented either via external PWM on DBRT (with BOSC tied to GND through 100kΩ) or DC voltage (0.2–1.2 V) applied to DBRT, generating internal DPWM at frequency set by CBOSC (1.2–1.6 kHz typical). Protection includes under-voltage lockout (3.4–4.3 V), thermal shutdown (130°C), and pulse-skipping mode at light load with 100 ns minimum on-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide-range industrial and consumer DC supplies including 12V and 24V rails. |
| Max LED Current per String | 60mA - sets upper limit for single-string brightness and thermal design margin in 12-string arrays. |
| Current Matching Accuracy | ±2.5% - ensures luminance uniformity across all 12 strings without external calibration. |
| Switching Frequency Range | 100 kHz to 500 kHz - adjustable via ROSC resistor to optimize inductor size, efficiency, and EMI. |
| LED Regulation Voltage | 410–690 mV - low headroom reduces power loss in current sinks and improves overall efficiency. |
| OVP Threshold | 1.20–1.26 V at OVP pin - programmable overvoltage protection prevents damage during open-string faults. |
| Thermal Shutdown | 130°C - protects die integrity during sustained overload or poor PCB thermal design. |
| Dimming Frequency (Internal) | 1.2–1.6 kHz - provides flicker-free dimming compatible with human visual persistence and camera capture. |
Pinout & Package
MP3389EY-LF-P is housed in a 28-pin SOIC package (body width 7.5 mm, pitch 1.27 mm), RoHS-compliant and lead-free. Thermal resistance θJA is 60°C/W, requiring adequate copper pour and vias for thermal management in high-current backlight applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No-connect pins - must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 2 | VIN | Main power input (5–28 V) - supplies both IC logic and boost converter; requires local ceramic bypass. |
| 3 | VCC | 5V internal LDO output - powers gate driver and analog circuitry; bypass to GND with ≥1 μF ceramic capacitor. |
| 9 | ISET | Current reference node - 1.22 V regulation enables precise LED current setting via external resistor (ILED = 1220 V / RSET). |
| 11–22 | LED1–LED12 | Open-drain current sink outputs - each drives one WLED string cathode; internally matched for ±2.5% current accuracy. |
| 23 | OVP | Over-voltage sense input - connects to resistor divider from boost output; triggers shutdown when voltage ≥1.23 V. |
| 24 | ISENSE | Peak current sensing input - monitors external sense resistor voltage for cycle-by-cycle current limiting and stability control. |
| 26 | GATE | N-MOSFET gate driver output - drives external high-side switch; capable of sourcing 4 Ω / sinking 2 Ω at 5 V. |
| 27 | VFAULT | Fault disconnection control - drives external PMOS to isolate input from output during fault or shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| 12-channel current balancing | ±2.5% matching between strings eliminates need for per-string current trimming in mass production. |
| Programmable switching frequency | 100–500 kHz via ROSC resistor - allows trade-off between inductor size, efficiency, and EMI compliance. |
| Dual dimming modes | External PWM (100 Hz–20 kHz) or DC-input linear dimming - supports system-level flexibility without MCU intervention. |
| Integrated open/short LED protection | Automatically detects and disables faulty strings using LEDX pin voltage thresholds (140–220 mV UVLO, 5.1–5.9 V OV). |
| Low 550 mV LED regulation voltage | Reduces conduction loss in current sinks by >30% vs. typical 1 V references, improving thermal performance at full load. |
| Internal 5 V LDO (VCC) | Self-powered gate driver and control logic - eliminates need for external bias supply, simplifying BOM and layout. |
Applications
| Desktop LCD Monitors | LCD Televisions |
|---|---|
|
Use Scenario: 24–32 inch desktop LCD panels with edge-lit or direct-lit WLED backlight requiring uniform brightness and low flicker. IC Role / Device Role / Timing Role: Primary LED current controller and boost converter supervisor - manages 12 parallel strings, regulates current, and executes PWM dimming synchronized to display frame rate. Use Value: ±2.5% current matching ensures <1% luminance variation across panel, meeting ISO 9241-307 uniformity requirements for professional displays. |
Use Scenario: 43–75 inch LCD TVs using multi-zone local dimming backlight with 12+ LED strings per zone. IC Role / Device Role / Timing Role: Zone-level LED driver - provides independent current regulation and synchronized dimming for each string group, enabling dynamic contrast enhancement. Use Value: Programmable OVP (1.23 V threshold) and short-string detection (5.5 V LEDX clamp) prevent catastrophic failure during LED binning mismatch or solder joint fatigue. |
| Flat Panel Video Displays | Industrial Control Panels |
|
Use Scenario: Commercial digital signage and kiosks operating 24/7 with ambient temperature up to 70°C and stringent MTBF targets. IC Role / Device Role / Timing Role: High-reliability backlight driver - handles continuous 60 mA/string operation with thermal shutdown (130°C) and UVLO hysteresis (200 mV) for brown-out immunity. Use Value: 550 mV LED regulation voltage minimizes power dissipation in current sinks, reducing junction temperature rise by ~8°C vs. 1 V reference devices at full load. |
Use Scenario: Ruggedized HMI displays in factory automation systems exposed to voltage transients and ESD events. IC Role / Device Role / Timing Role: Fault-tolerant LED driver - uses VFAULT-controlled PMOS to disconnect input during OVP/OTP faults, preventing downstream damage. Use Value: Open-string detection via LEDX UVLO (180 mV threshold) enables graceful degradation - remaining strings stay lit while faulty ones are marked off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3389EF-LF-Z | Identical electrical specs but in TSSOP-28 package (θJA = 32°C/W vs. SOIC's 60°C/W); 30% smaller footprint. | Better suited for space-constrained designs where thermal headroom allows tighter layout; requires finer-pitch assembly. | Select EF variant when board area is critical and thermal design supports higher power density. |
| LM3409QMH/NOPB | Single-channel buck-boost LED controller (no integrated current sinks); requires external MOSFETs and current sense per string. | Supports flexible topology (buck, boost, SEPIC) but demands 12× more external components and layout effort for same channel count. | Choose LM3409QMH only when non-standard LED configurations (e.g., mixed forward voltages) or topology flexibility outweigh integration benefits. |
Compared with MP3389EY-LF-P, the EF variant offers superior thermal performance in compact layouts, while the LM3409QMH trades integration for topology adaptability - making the EY the optimal choice for standardized, high-channel-count LCD backlighting where BOM count and layout simplicity are prioritized.
Availability
MP3389EY-LF-P is available at Aetrix Electronics and suitable for LCD TV backlighting, desktop monitor illumination, flat-panel video signage, and industrial HMI displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MP3389EY-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 design centers in the US, China, and Taiwan, and global distribution through authorized partners.
The MP3389 belongs to MPS's WLED backlight driver product line, engineered specifically for large-format LCD panels requiring high channel count, tight current matching, and robust fault protection in cost-sensitive consumer and industrial displays.
FAQ
What is the maximum total output power supported by MP3389EY-LF-P?
The MP3389EY-LF-P does not specify a total output power rating, but its architecture supports up to 12 strings × 60 mA × 28 V ≈ 20.2 W theoretical maximum. Real-world limits are governed by thermal design: SOIC-28 package θJA = 60°C/W restricts continuous power dissipation to ~1.3 W at +70°C ambient, implying practical output power ≤12 W with proper PCB copper and airflow.
Can MP3389EY-LF-P drive LEDs with forward voltages exceeding 28 V?
No. The MP3389EY-LF-P is a step-up controller driving an external MOSFET; its maximum output voltage is determined by external components (inductor, diode, output capacitor, and OVP divider), not the IC itself. However, the LEDX pins tolerate up to +50 V, and OVP can be set beyond 28 V - so yes, it can regulate strings totaling >28 V if the boost stage is properly designed and the OVP threshold is scaled accordingly.
How does the MP3389EY-LF-P handle partial string failures?
It detects open strings via LEDX pin UVLO (140–220 mV) and short strings via LEDX OV (5.1–5.9 V), marking off faulty strings after 512 switching cycles. Remaining active strings continue regulation, maintaining partial backlight functionality. If all strings fail, the IC shuts down the boost converter and asserts VFAULT to disconnect input power.
Is external compensation required for stable loop operation?
Yes. Pin 4 (COMP) requires an external RC network (typically 1–10 nF capacitor + 1–10 kΩ resistor to GND) to stabilize the boost converter's feedback loop. The exact values depend on inductor value, output capacitance, and desired phase margin - MPS Application Note AN-107 provides design guidelines and Bode plot examples for common configurations.
Does MP3389EY-LF-P support analog dimming?
No. It supports only PWM-based dimming: either externally applied PWM signal on DBRT (with BOSC grounded) or DC voltage (0.2–1.2 V) converted internally to DPWM. There is no true analog (linear) current adjustment - dimming resolution is determined by DPWM frequency and duty cycle granularity, not DAC linearity.
What is the purpose of the VFAULT pin and how is it used?
VFAULT is an open-drain output that controls an external PMOS transistor between VIN and the boost converter input. During normal startup, it ramps up slowly to limit inrush current. During faults (OVP, OTP, UVLO), it pulls low to turn off the PMOS and isolate the input supply - protecting upstream power sources and enabling safe system-level fault recovery without manual reset.
Can the switching frequency be synchronized to an external clock?
No. The MP3389EY-LF-P uses an internal oscillator controlled solely by the ROSC resistor on pin 8. It lacks an external sync input or clock injection capability. Frequency synchronization to system clocks is not supported; designers must manage potential beat frequencies via careful layout and filtering if multiple MP3389s operate in proximity.
MP3389EY-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 12
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 160kHz ~ 650kHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MP3389EY-LF-P FAQ
1.How can I place an order for MP3389EY-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3389EY-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 MP3389EY-LF-P reliable?
The price and inventory of MP3389EY-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 MP3389EY-LF-P is usually 5 days.
3.What payment methods are accepted for MP3389EY-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3389EY-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3389EY-LF-P?
MP3389EY-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3389EY-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 MP3389EY-LF-P?
For technical support, including MP3389EY-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3389EY-LF-P requirements.
6.How does Aetrix verify that MP3389EY-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3389EY-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 MP3389EY-LF-P meets industry standards.
7.What is the process for return or replacement of MP3389EY-LF-P?
All MP3389EY-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3389EY-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 MP3389EY-LF-P part is unused and in its original packaging.
Return procedure for MP3389EY-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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