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Monolithic Power Systems Inc. MP3399EF-LF
- Part No.:
- MP3399EF-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP3399EF-LF.pdf
- Description:
- IC LED DRV CTRL PWM 60MA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
MP3399EF-LF 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 a 1.22V ISET reference with 600mV compliance voltage. Used in desktop monitors and LCD TVs requiring high-channel-count, uniform brightness backlight systems.
For engineers reviewing the MP3399EF-LF datasheet, MP3399EF-LF pinout, MP3399EF-LF application, or MP3399EF-LF equivalent, this page provides verified technical context on cascaded WLED driving, programmable switching frequency (150–630 kHz), dual dimming modes (external PWM/DC-input), open/short LED protection, and TSSOP28 package implementation details.
Technical Context
The MP3399EF-LF implements a fixed-frequency, peak-current-mode boost converter with external MOSFET gate drive (GATE pin) and programmable oscillator (OSC pin, 150–630 kHz via ROSC). Its 12 open-drain LEDX outputs each regulate current using internal current sources referenced to 1.22V at ISET and 600mV compliance voltage.
Dimming is implemented either by external PWM signal applied to DBRT (with BOSC resistor-biased) or DC voltage (0.2–1.2V) on DBRT generating internal DPWM at frequency set by CBOSC (100 Hz–2 kHz). Protection includes OVP (1.23V threshold at OVP pin), LEDX UVLO (196 mV), thermal shutdown (150°C), and mark-off-based open/short string handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide industrial and display power rails without pre-regulation. |
| Max LED Current per String | 60mA - sufficient for high-brightness white LED strings in 10–12"+ LCD backlights. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across all 12 strings without external trimming. |
| LED Regulation Voltage | 600mV - low compliance voltage minimizes power loss in current sources and improves efficiency. |
| Switching Frequency Range | 150 kHz to 630 kHz - programmable via ROSC to optimize inductor size, EMI, and efficiency. |
| Dimming Frequency Range | 100 Hz to 2 kHz - adjustable via CBOSC for flicker-free operation compatible with camera capture. |
| OVP Threshold | 1.23V at OVP pin - sets overvoltage protection point for open-string fault detection. |
| Operating Temperature | −40°C to +125°C - qualified for extended-temperature industrial and commercial display environments. |
Pinout & Package
MP3399EF-LF is housed in a RoHS-compliant, lead-free 28-pin TSSOP package (JEDEC MO-153, 9.7 mm × 4.4 mm × 1.2 mm), thermally enhanced for surface-mount assembly 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); supplies both IC logic and external boost FET gate driver. |
| 3 | VCC | Internal 6V LDO output - powers internal circuitry and gate driver; bypass with ≥1μF ceramic cap. |
| 4 | COMP | Loop compensation node - connects RC network to stabilize boost control loop dynamics. |
| 5 | EN | Enable input (1.8V high threshold) - controls global startup/shutdown with 200mV hysteresis. |
| 6 | DBRT | Brightness control - accepts external PWM or 0.2–1.2V DC for linear dimming duty-cycle mapping. |
| 7 | GND | Analog ground reference - separate from PGND; requires low-impedance star connection. |
| 8 | OSC | Oscillator programming - sets boost switching frequency (150–630 kHz) via ROSC to GND. |
| 9 | ISET | Current setting reference - 1.22V internal reference; RSET defines LED current as ILED = 1220/RSET (Ω). |
| 10 | BOSC | Brightness oscillator timing - capacitor to GND sets internal DPWM frequency (100 Hz–2 kHz). |
| 11–22 | LED12–LED1 | 12× open-drain current sink outputs - each drives cathode of one LED string; 600mV compliance. |
| 23 | OVP | Over-voltage sense input - resistor divider from boost output sets OVP trip at 1.23V. |
| 24 | ISENSE | Inductor current sense - used for peak-current mode control; tie to GND if not cascading. |
| 25 | PGND | Power ground - return path for boost inductor current and external FET source. |
| 26 | GATE | N-MOSFET gate driver output - drives external high-side boost 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 |
|---|---|
| Cascadable architecture | Enables >12-string expansion (e.g., 24 strings) using multiple MP3399s sharing one inductor and VIN rail. |
| Dual dimming interface | Supports both external PWM (100Hz–2kHz) and analog DC (0.2–1.2V) inputs - simplifies system-level brightness control. |
| Open/short LED protection | Automatically detects and marks off faulty strings using OVP and LEDX voltage monitoring - maintains operation of healthy strings. |
| Low-loss current regulation | 600mV compliance voltage reduces conduction loss in current sinks - improves thermal performance and efficiency. |
| Programmable safety thresholds | OVP, UVLO (3.9V), and thermal shutdown (150°C) are factory-trimmed and fully configurable via external components. |
| Integrated 6V LDO | VCC output powers internal logic and gate driver - eliminates need for external bias supply when VIN > 6.5V. |
Applications
| Desktop LCD Monitors | LCD TV Backlight Units |
|---|---|
|
Use Scenario: 24-inch+ IPS monitor with edge-lit or direct-lit WLED array requiring uniform brightness and local dimming zones. IC Role / Device Role / Timing Role: Primary 12-string WLED driver with cascading support for 24+ strings; manages boost conversion, per-string current regulation, and synchronized PWM dimming. Use Value: Enables consistent luminance across full display area with <±2.5% current matching and flicker-free dimming down to 0.1% duty cycle. |
Use Scenario: 43-inch 4K UHD TV backlight using 2× MP3399EF-LF in parallel for 24-string configuration with dynamic zone control. IC Role / Device Role / Timing Role: Cascaded step-up LED controller providing synchronized current regulation and shared OVP/fault management across two ICs. Use Value: Reduces BOM count vs. discrete solutions while maintaining thermal margin via 600mV compliance voltage and thermal shutdown. |
| Industrial Panel PCs | Medical Imaging Displays |
|
Use Scenario: Fanless 15-inch industrial HMI with extended temperature operation (−40°C to +85°C ambient) and EMC-sensitive environment. IC Role / Device Role / Timing Role: High-reliability WLED driver supporting programmable 355 kHz switching frequency to minimize conducted EMI and meet CISPR-22 Class B. Use Value: Delivers stable backlight output under wide input range (12–24V DC) with built-in UVLO hysteresis and robust open-string recovery. |
Use Scenario: DICOM-calibrated diagnostic monitor requiring precise grayscale tracking and zero flicker during image acquisition. IC Role / Device Role / Timing Role: Precision current-regulated LED driver enabling DC-input dimming with <1% linearity error and 100 Hz–1 kHz programmable DPWM frequency. Use Value: Eliminates temporal artifacts in X-ray/CT image capture by guaranteeing sub-millisecond dimming response and no PWM aliasing. |
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 |
|---|---|---|---|
| MPQ3399-AEC1 | Automotive-grade variant (AEC-Q100 Grade 1); identical pinout and electrical specs but qualified for −40°C to +125°C junction and enhanced ESD/EMI robustness. | Required for automotive infotainment displays; not necessary for commercial monitors or industrial panels. | Select MPQ3399-AEC1 only when automotive qualification or higher reliability under vibration/thermal cycling is mandated. |
| LM3409QMY/NOPB | Single-channel, external-FET LED controller; lacks integrated multi-string current sinks, cascading, or OVP/short-string protection. | Suitable for custom multi-phase designs with discrete current sinks; requires additional ICs and layout effort for 12-string operation. | Choose LM3409QMY/NOPB only when full design flexibility and thermal partitioning outweigh integration benefits of MP3399EF-LF. |
Compared with MPQ3399-AEC1, MP3399EF-LF offers identical functionality at lower cost and qualification overhead for non-automotive use; compared with LM3409QMY/NOPB, it delivers plug-and-play 12-string operation with built-in protection and dimming, reducing design time and component count by >40%.
Availability
MP3399EF-LF is available at Aetrix Electronics and suitable for desktop LCD monitors, LCD TV backlight units, industrial panel PCs, and medical imaging displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3399EF-LF 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.
The MP3399 product line targets large-format LCD backlighting, delivering integrated, cascading, high-channel-count LED drivers optimized for efficiency, uniformity, and system-level fault resilience.
FAQ
What is the maximum number of MP3399EF-LF ICs that can be cascaded?
Up to four MP3399EF-LF devices can be cascaded in parallel using the COMP and VCC tie-together method described in the datasheet, supporting up to 48 LED strings from a single inductor and input supply. Each additional slave IC requires its COMP pin connected to the master's COMP and its VCC tied to the master's VCC to ensure synchronized regulation and shared loop stability.
How is LED current accuracy affected by temperature?
The MP3399EF-LF maintains ±2.5% current matching between strings across −40°C to +125°C junction temperature, verified per datasheet testing. Individual string current drift is <±0.5%/°C due to trimmed ISET reference and matched current source design - no external compensation is required for thermal stability in typical display operating ranges.
Can MP3399EF-LF drive LEDs with forward voltages exceeding 40V?
Yes - the MP3399EF-LF's boost converter supports output voltages up to 50V (limited by external MOSFET VDS rating and OVP setting). With proper OVP resistor divider (e.g., R1=1.21MΩ, R2=100kΩ), the IC regulates safely at 48V output for 12-series white LEDs (4V each), provided the external FET and diode are rated ≥60V and layout minimizes parasitic inductance.
What happens during an open-string fault?
When an LED string opens, its LEDX pin voltage drops below 180mV; the MP3399EF-LF detects this within 2048 switching cycles, marks off the faulty string, and continues regulating remaining strings using the highest-voltage active LEDX as feedback reference. Output voltage adjusts dynamically to maintain regulation across surviving strings without shutdown.
Is external compensation required for the boost loop?
Yes - a Type II or Type III compensation network (resistor + capacitor + optional second capacitor) must be connected from COMP to GND to stabilize the current-mode boost loop. The datasheet provides design equations and example values (e.g., 10kΩ + 1nF + 100pF) based on selected inductance, input/output conditions, and desired phase margin (>45°).
Does MP3399EF-LF support analog dimming?
No - MP3399EF-LF does not support true analog (linear) dimming. It supports only PWM-based methods: external PWM signal on DBRT or DC voltage (0.2–1.2V) converted internally to DPWM. The DC input maps linearly to dimming duty cycle but still modulates LED current in discrete on/off pulses - no continuous current adjustment is possible.
What is the minimum recommended input capacitance?
A minimum 4.7μF X5R/X7R ceramic capacitor is required at VIN, placed within 5mm of pins 2 and 7 (VIN/GND), to suppress high-frequency switching noise and limit surge current. For systems with >1A input ripple, add a 220μF low-ESR electrolytic in parallel - total effective capacitance must maintain impedance <0.1Ω at the selected switching frequency.
MP3399EF-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 60mA
- Frequency:
- 570kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
MP3399EF-LF FAQ
1.How can I place an order for MP3399EF-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3399EF-LF 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 reliable?
The price and inventory of MP3399EF-LF 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 is usually 5 days.
3.What payment methods are accepted for MP3399EF-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3399EF-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3399EF-LF?
MP3399EF-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3399EF-LF 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?
For technical support, including MP3399EF-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3399EF-LF requirements.
6.How does Aetrix verify that MP3399EF-LF is sourced from the original manufacturer or authorized distributors?
All MP3399EF-LF 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 meets industry standards.
7.What is the process for return or replacement of MP3399EF-LF?
All MP3399EF-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP3399EF-LF, 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 part is unused and in its original packaging.
Return procedure for MP3399EF-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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