My Inquiry
My Account
Monolithic Power Systems Inc. MP3399EF-LF-P
- Part No.:
- MP3399EF-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP3399EF-LF-P.pdf
- Description:
- HIGH VOLTAGE, 12-STRING BOOST WL
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP3399EF-LF-P from Monolithic Power Systems is a 12-string, cascading white LED driver IC with integrated step-up controller and 12-channel current sources for large LCD panel backlighting. It operates from 5V–28V input, delivers up to 60mA per string, achieves ±2.5% inter-string current matching, and regulates LED current via external ISET resistor (1.22V reference). Used in desktop monitors and LCD TVs where uniform brightness across high-channel-count WLED arrays is critical.
For engineers reviewing the MP3399EF-LF-P datasheet, MP3399EF-LF-P pinout, MP3399EF-LF-P application, or MP3399EF-LF-P equivalent, key selection criteria include cascading capability with single-inductor topology, programmable switching frequency (150–630 kHz), 600mV LED current-sense voltage for efficiency, dual PWM/DC dimming control, and open/short LED fault protection with VFAULT signaling.
Technical Context
The MP3399EF-LF-P implements a fixed-frequency, peak-current-mode boost converter with external MOSFET gate drive (GATE pin) and 12 independent, open-drain LED current sinks (LED1–LED12). Its internal 6V LDO (VCC) powers control circuitry and gate driver, while COMP pin enables loop compensation for stable regulation under varying load and input conditions.
Dimming is implemented either via external PWM signal on DBRT (with BOSC resistor-biased) or DC voltage (0.2–1.2V) on DBRT generating internal DPWM at frequency set by BOSC capacitor. Protection includes programmable OVP (via resistor divider on OVP pin), LED open/short detection (using LEDX pin voltage thresholds), thermal shutdown (150°C), and UVLO (3.9V rising edge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide-range industrial and consumer DC supplies without pre-regulation. |
| LED Current per String | Up to 60mA - sufficient for high-brightness WLED strings in 10–24 inch panels. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across all 12 strings without per-string calibration. |
| LED Regulation Voltage | 600mV - low sense voltage minimizes power loss in current sources, improving system efficiency. |
| Switching Frequency Range | 150kHz to 630kHz - programmable via OSC resistor for optimal trade-off between EMI, inductor size, and efficiency. |
| Dimming Control Modes | PWM (external) or DC-input PWM - enables flexible brightness control compatible with MCU GPIO or analog DAC outputs. |
| OVP Threshold Accuracy | ±5% (1.23V reference) - allows precise overvoltage cutoff to protect LEDs and output capacitors during open-string faults. |
Pinout & Package
MP3399EF-LF-P is housed in a RoHS-compliant, lead-free 28-pin TSSOP package (JEDEC MO-153, 9.7mm × 4.4mm), optimized for thermal dissipation (θJA = 32°C/W) in space-constrained backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No-connect pins - must remain unconnected to avoid parasitic coupling or latch-up. |
| 2 | VIN | Main power input (5–28V) for both IC bias and boost converter - requires local ceramic bypassing. |
| 3 | VCC | 6V internal LDO output - powers gate driver and logic; ties to VIN if VIN < 6.5V. |
| 4 | COMP | Loop compensation node - connects RC network to stabilize feedback control of boost output. |
| 5 | EN | Active-high enable - controls startup sequence; requires 0.1μF local filter to suppress noise. |
| 6 | DBRT | Brightness control input - accepts PWM or 0.2–1.2V DC for linear dimming duty cycle generation. |
| 7 | GND | Analog ground reference - separate from PGND to minimize noise coupling into sensing paths. |
| 8 | OSC | Oscillator frequency set - resistor to GND programs switching frequency (150–630 kHz). |
| 9 | ISET | LED current programming - 1.22V reference sets string current via external resistor (ILED = 1220/RSET). |
| 10 | BOSC | Dimming oscillator timing - capacitor to GND sets internal DPWM frequency (100Hz–2kHz). |
| 11–22 | LED12–LED1 | 12 open-drain current sink outputs - each drives cathode of one WLED string; supports cascading. |
| 23 | OVP | Over-voltage protection input - resistor divider from boost output sets OVP threshold (1.23V reference). |
| 24 | ISENSE | Inductor current sense - used for peak-current-mode control; tie to GND in non-cascaded configs. |
| 25 | PGND | Power ground for boost switch - separates high-di/dt return path from analog ground. |
| 26 | GATE | N-MOSFET gate driver output - drives external high-side switch; 4Ω source / 2Ω sink impedance. |
| 27 | VFAULT | Fault disconnection control - drives external PMOS to isolate input during fault or shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Cascading architecture | Enables >12 LED strings using multiple MP3399s sharing one inductor - reduces BOM cost and board area vs. discrete solutions. |
| 600mV LED current-sense voltage | Reduces conduction loss in current sources by ~50% vs. typical 1.2V references - directly improves thermal performance and efficiency. |
| Programmable OVP with resistor divider | Allows precise overvoltage cutoff (e.g., 1.2× nominal VOUT) - prevents LED overvoltage stress during open-string events. |
| Dual dimming mode support | Eliminates need for external PWM generator - DC input mode enables simple microcontroller DAC-based brightness control. |
| Integrated open/short LED detection | Automatically disables faulty strings (VLEDX < 180mV or > 6.3V) while maintaining regulation on remaining strings - enhances system reliability. |
Applications
| Desktop LCD Monitors | LCD TV Backlight Modules |
|---|---|
|
Use Scenario: 24-inch to 27-inch IPS panel requiring uniform edge-lit backlight with 12–24 WLED strings. IC Role / Device Role / Timing Role: Primary WLED current controller and boost regulator - manages string current matching, dimming synchronization, and fault isolation. Use Value: Enables consistent luminance across full display area without per-string trimming, reducing manufacturing test time and cost. |
Use Scenario: 43-inch to 55-inch LCD TV with local dimming zones driven by cascaded MP3399EF-LF-P controllers. IC Role / Device Role / Timing Role: Cascaded LED driver node - synchronizes dimming across multiple ICs using shared VCC and COMP lines for coherent zone control. Use Value: Supports dynamic local dimming with minimal inter-IC skew, improving contrast ratio and black-level performance. |
| Industrial Panel PCs | Medical Imaging Displays |
|
Use Scenario: Fanless, sealed-panel PC in factory automation with extended temperature operation (-40°C to +125°C). IC Role / Device Role / Timing Role: Robust backlight driver - leverages UVLO, thermal shutdown, and wide VIN range for reliable operation in harsh environments. Use Value: Eliminates backlight failure risk due to voltage transients or thermal overload, meeting industrial uptime requirements. |
Use Scenario: Diagnostic-grade medical monitor requiring flicker-free, calibrated brightness over 10,000-hour lifetime. IC Role / Device Role / Timing Role: Precision current regulator - uses ±2.5% matching and low-drift ISET reference to maintain grayscale linearity. Use Value: Ensures DICOM-compliant luminance stability without recalibration, supporting clinical image fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3326-AEC1 | Automotive-qualified (AEC-Q100), 6-string, integrated MOSFET, lower max current (40mA/string) | Targeted for automotive instrument clusters and center displays - lacks cascading and 12-string capability | Select when AEC-Q100 compliance and integrated FET are required; not suitable for high-channel-count LCD TVs. |
| LM3409QMY/NOPB | Single-string buck-boost LED controller, no integrated current sinks, requires external current sense and dimming circuitry | Used in general-purpose LED lighting - lacks multi-string matching, OVP, and fault reporting features | Choose for custom topologies or non-backlight applications where flexibility outweighs integration benefits. |
Compared with MP3399EF-LF-P, MPQ3326-AEC1 trades channel count and cascading for automotive qualification and integration, while LM3409QMY/NOPB offers topology freedom at the cost of design complexity and missing backlight-specific protections.
Availability
MP3399EF-LF-P is available at Aetrix Electronics and suitable for LCD TV backlight modules, industrial panel PCs, and medical imaging displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3399EF-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.
The MP3399 product line targets large-format LCD backlighting, emphasizing high channel count, cascading scalability, and robust fault management for commercial and industrial display systems.
FAQ
What is the maximum number of MP3399EF-LF-P ICs that can be cascaded?
Multiple MP3399EF-LF-P units can be cascaded in parallel using shared VCC and COMP connections to extend LED channels beyond 12. The datasheet demonstrates 2-IC (24-string) operation, and designs with 3+ ICs are feasible with careful layout to minimize COMP node capacitance and ensure stable loop response across all units.
How does the MP3399EF-LF-P handle an open LED string?
When an LED string opens, its corresponding LEDX pin voltage drops below 180mV. The IC detects this condition, marks off the faulty string, and continues regulating remaining strings using the highest-voltage active LEDX pin as the feedback reference - maintaining backlight operation without full shutdown.
Can the MP3399EF-LF-P operate without an external MOSFET?
No. The MP3399EF-LF-P is a controller-only IC and requires an external N-channel MOSFET connected to the GATE pin to implement the boost converter. It does not integrate any power switches - enabling selection of optimized FETs for voltage, current, and thermal requirements.
What is the minimum recommended input capacitor value for stable operation?
A minimum 4.7μF X5R/X7R ceramic capacitor is required at VIN, paralleled with a 220μF electrolytic capacitor for bulk storage. This combination ensures low impedance at switching frequencies up to 630kHz and suppresses input surge currents during PWM dimming transitions.
Is the 600mV LED current-sense voltage adjustable?
No. The 600mV regulation voltage across each LED current sink is a fixed internal reference and cannot be adjusted. LED string current is set solely by the external ISET resistor value, using the relationship ILED = 1.22V / RSET, with 1.22V being the ISET pin reference voltage.
Does the MP3399EF-LF-P support analog (DC) dimming only, or PWM dimming only?
It supports both: DC input dimming (0.2–1.2V on DBRT) generates internal DPWM, while external PWM (≥1.2V amplitude, 100Hz–2kHz) applied directly to DBRT bypasses the internal oscillator. Both methods modulate all 12 strings simultaneously with identical duty cycle.
What thermal derating applies above 25°C ambient?
With θJA = 32°C/W in TSSOP28, power dissipation must be reduced linearly above +25°C: PDMAX = (150°C − TA) / 32°C/W. At +85°C ambient, max continuous power drops to 2.03W - requiring attention to PCB copper area and airflow in enclosed displays.
MP3399EF-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 150kHz ~ 630kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
MP3399EF-LF-P FAQ
1.How can I place an order for MP3399EF-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3399EF-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 MP3399EF-LF-P reliable?
The price and inventory of MP3399EF-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 MP3399EF-LF-P is usually 5 days.
3.What payment methods are accepted for MP3399EF-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3399EF-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3399EF-LF-P?
MP3399EF-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3399EF-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 MP3399EF-LF-P?
For technical support, including MP3399EF-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3399EF-LF-P requirements.
6.How does Aetrix verify that MP3399EF-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3399EF-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 MP3399EF-LF-P meets industry standards.
7.What is the process for return or replacement of MP3399EF-LF-P?
All MP3399EF-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3399EF-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 MP3399EF-LF-P part is unused and in its original packaging.
Return procedure for MP3399EF-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP3399EF-LF-P Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
