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Monolithic Power Systems Inc. MP3393EF-LF-Z
- Part No.:
- MP3393EF-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP3393EF-LF-Z.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,456
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Product details
Overview
MP3393EF-LF-Z from Monolithic Power Systems is an 8-string step-up white LED driver controller with external NMOS gate drive and PNP transistor current regulation, operating from 9V to 32V input, delivering up to 300mA per string with 1.2% inter-string current matching accuracy and 202mV FB regulation voltage for high-efficiency backlighting in large LCD TVs and monitors.
For engineers reviewing the MP3393EF-LF-Z datasheet, MP3393EF-LF-Z pinout, MP3393EF-LF-Z application, or MP3393EF-LF-Z equivalent, key selection criteria include programmable 120–160kHz switching frequency via OSC resistor, dual analog/PWM dimming support, open/short LED string protection with fault flag output, and daisy-chain capability for >8-string systems.
Technical Context
The MP3393EF-LF-Z implements peak-current-mode step-up control with internal 10V LDO (VCC) powering gate drivers and logic, using an external NMOS switch driven by the GATE pin and eight independent PNP-based constant-current channels regulated via CTLx/FBx pairs. Its error amplifier references a 320mV threshold at CTLx pins and 202mV at FBx pins to maintain precise per-string current.
It integrates OVP detection via resistor-divider on OVP pin (trip at 1.23V), thermal shutdown at 150°C, UVLO with 400mV hysteresis, and fault management through open-drain FF pin. Daisy-chaining is enabled by tying COMP and VCC between master/slave ICs while grounding slave ISENSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 32V - supports wide-range industrial and consumer DC supplies including 12V/24V rails. |
| LED String Count | 8 independent strings - enables full-array local dimming for large-format LCD panels up to 65-inch class. |
| Per-String Current | 50mA to 300mA - set externally via RSET on FBx pins; 202mV reference ensures low power loss in sense path. |
| Current Matching Accuracy | ±1.2% - tight inter-string uniformity critical for consistent brightness and color fidelity in display backlights. |
| Switching Frequency | 120–160kHz (typ. @ ROSC = 115kΩ) - programmable for EMI optimization and inductor size trade-off. |
| Dimming Support | Analog (0.4–1.5V DC) and external PWM (50Hz–2kHz) - enables flicker-free, high-resolution brightness control. |
| OVP Threshold | 1.23V on OVP pin - sets overvoltage trip point for open-string protection; corresponds to ~1.1–1.2×VOUT. |
| Fault Flag Output | Open-drain FF pin - sinks current during open/short LED or thermal fault, simplifying system-level status monitoring. |
Pinout & Package
TSSOP28EP package with exposed thermal pad (connected to GND), 0.65mm pitch, RoHS-compliant LF-Z tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input & Boost Switch Source | Accepts 9–32V supply; also serves as high-side switch node for external NMOS; requires local ceramic bypass. |
| 2 VCC | Internal 10V LDO Output | Powers gate driver and internal logic; regulated 10V ±1V; must be bypassed to GND with ceramic capacitor. |
| 4 OSC | Frequency Set Input | Connects to GND via resistor to program fSW; internal 1.23V reference enables precise oscillator calibration. |
| 5 EN | Enable Control | Active-high logic input; 1.85V threshold; disables all functions when low; prevents floating via capacitor. |
| 6 DIM | Dimming Interface | Accepts analog DC (0.4–1.5V) or external PWM signal; directly modulates LED current without external DAC. |
| 7–8, 9–10, ..., 21–22 FBx/CTLx (x=1–8) | Per-String Current Sense & Control | FBx senses current-sense resistor voltage; CTLx drives external PNP base - together regulate string current with 320mV reference. |
| 23 FF | Fault Flag Output | Open-drain output pulled low during open/short LED or thermal fault; simplifies system-level fault reporting. |
| 24 OVP | Over-Voltage Protection Input | Resistor-divider input; trips at 1.23V to disable boost stage if output exceeds safe limit due to open string. |
| 25 GND | Power Ground | Main ground return for boost converter and logic; connects to exposed pad for thermal dissipation. |
| 26 ISENSE | Inductor Current Sense | Monitors external sense resistor for peak-current mode control; tie to GND if not daisy-chained. |
| 27 GATE | NMOS Gate Driver Output | Drives external N-channel MOSFET gate; 4Ω source / 2Ω sink impedance ensures fast switching transitions. |
| 28 VFAULT | Fault Disconnection Gate | Drives external PMOS to disconnect input during fault; rises to VIN when active, drops during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable switching frequency (100–500kHz) | Enables EMI compliance and optimized magnetics selection via single ROSC resistor - no external clock required. |
| 8-channel independent constant-current regulation | Each string controlled via dedicated FBx/CTLx pair with 1.2% matching - eliminates need for per-string DACs or op-amps. |
| Dual dimming interface (analog + PWM) | Supports both linear DC voltage and external PWM without additional circuitry - reduces BOM count and layout complexity. |
| Integrated open/short LED string protection | Detects fault conditions via CTLx voltage thresholds (210mV UVLO, 6.4V OVLO) and asserts FF pin - avoids external comparators. |
| Daisy-chain capability for >8 strings | COMP and VCC sharing between master/slave ICs allows scalable backlight architectures - no additional timing or sync signals needed. |
| Thermal shutdown and UVLO with hysteresis | 150°C shutdown and 400mV UVLO hysteresis ensure robust operation across automotive-grade temperature range (-40°C to +125°C). |
Applications
| Large-Format LCD TV Backlight | Professional Monitor Local Dimming |
|---|---|
|
Use Scenario: Driving 8 parallel WLED strings (10–15 LEDs each) in 55–75 inch LCD TVs with dynamic local dimming zones. IC Role / Device Role / Timing Role: Step-up controller regulating per-string current via external PNP transistors and NMOS switch; manages OVP, FF signaling, and daisy-chain expansion. Use Value: 1.2% current matching ensures uniform luminance across zones; 202mV FB reference minimizes sense resistor power loss at 300mA/string. |
Use Scenario: High-precision backlight for medical and broadcast monitors requiring flicker-free dimming and minimal grayscale banding. IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming (0.4–1.5V) and PWM synchronization for sub-1% brightness resolution. Use Value: Dual dimming modes enable seamless transition between ambient light adaptation (analog) and frame-synced content dimming (PWM). |
| Commercial Digital Signage | Industrial HMI Display Backlight |
|
Use Scenario: 24/7 operation in outdoor kiosks and retail signage with wide input voltage (12–32V) and thermal stress resilience. IC Role / Device Role / Timing Role: Primary LED controller with thermal shutdown, UVLO hysteresis, and fault flag reporting for remote diagnostics. Use Value: 150°C thermal shutdown and -40°C to +125°C operating range ensure reliability under uncontrolled ambient conditions. |
Use Scenario: Embedded human-machine interface displays in factory automation panels with strict EMC and long-lifecycle requirements. IC Role / Device Role / Timing Role: Robust LED driver supporting daisy-chained configuration to scale from 4 to 16 strings without redesigning power stage. Use Value: COMP/VCC sharing between MP3393 units enables modular backlight architecture - reduces design iterations and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel WLED step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3393-AEC1 | Automotive-grade variant with AEC-Q100 qualification, extended -40°C to +125°C operation, and enhanced ESD tolerance (±8kV HBM). | Required for automotive infotainment and instrument cluster backlighting; not suitable for cost-sensitive consumer displays. | Select when automotive qualification, higher reliability, or extended temperature margin is mandatory. |
| RT9397BF | 8-channel WLED driver with integrated MOSFETs (no external FET required); lower max input voltage (18V); fixed 1MHz switching frequency. | Better suited for compact portable displays; lacks daisy-chain capability and programmable frequency. | Choose for space-constrained designs where external FETs are undesirable and input voltage stays ≤18V. |
Compared with MP3393EF-LF-Z, MPQ3393-AEC1 adds automotive qualification but increases cost and footprint; RT9397BF integrates power switches but sacrifices flexibility in frequency tuning and scalability - MP3393EF-LF-Z remains optimal for high-voltage, field-upgradeable large-panel backlight systems.
Availability
MP3393EF-LF-Z is available at Aetrix Electronics and suitable for large-format LCD TV backlighting, professional monitor local dimming, and industrial HMI display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3393EF-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 MP3393 belongs to MPS's high-efficiency WLED backlight controller product line, designed specifically for large-panel LCD video displays requiring precise multi-string current regulation and robust fault management.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP3393EF-LF-Z has an input UVLO rising threshold of 7.5–8.5V with 400mV hysteresis. Reliable startup occurs at ≥8.5V; operation below 9V risks intermittent enable behavior. The internal 10V LDO requires VIN >10V to sustain full gate drive strength.
How is LED string current set, and what is the role of the 202mV FB reference?
String current is set by ILED = 202mV / RSET, where RSET is the sense resistor on each FBx pin. The 202mV reference minimizes power dissipation in the sense path - at 300mA, only 60.6mW is lost versus 300mW at 1V - improving thermal performance and efficiency.
Can MP3393EF-LF-Z drive LED strings with different forward voltages?
Yes. The MP3393EF-LF-Z automatically selects the highest-voltage CTLx pin as the feedback reference, allowing mixed-string configurations. However, all strings must share the same boost output rail; mismatched VF beyond the OVP margin may trigger protection.
What external components are mandatory for basic operation?
Mandatory components include: input capacitor (4.7µF ceramic + 220µF electrolytic), OSC resistor (e.g., 115kΩ for 140kHz), FBx sense resistors, external NMOS (driven by GATE), eight PNP transistors (driven by CTLx), and OVP resistor divider. GND bypass on VCC and local filtering on EN/DIM are also required.
Does MP3393EF-LF-Z support synchronization between multiple ICs?
No native clock synchronization; however, daisy-chained configurations achieve functional synchronization via shared COMP and VCC nodes. For precise PWM dimming alignment, apply identical external PWM signals to all DIM pins - verified in typical application circuits.
What failure modes trigger the FF pin, and how is it interfaced?
FF pin pulls low during LED open-circuit (CTLx < 210mV), short-circuit (CTLx > 6.4V), thermal shutdown (>150°C), or input UVLO. It is open-drain: connect to VCC via 10kΩ pull-up; microcontroller GPIO can monitor FF as active-low fault indicator with no additional level-shifting.
Is the TSSOP28EP package thermally enhanced, and how should the exposed pad be handled?
Yes - the exposed pad is electrically GND and thermally critical. It must be soldered to a minimum 100mm² copper pour with ≥4 thermal vias (0.3mm diameter) to internal GND planes. Thermal resistance θJA drops from 60°C/W (SOIC28) to 32°C/W (TSSOP28EP) with proper layout.
MP3393EF-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- 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:
- 8
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 32V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 140kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
MP3393EF-LF-Z FAQ
1.How can I place an order for MP3393EF-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3393EF-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 MP3393EF-LF-Z reliable?
The price and inventory of MP3393EF-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 MP3393EF-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3393EF-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3393EF-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3393EF-LF-Z?
MP3393EF-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3393EF-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 MP3393EF-LF-Z?
For technical support, including MP3393EF-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3393EF-LF-Z requirements.
6.How does Aetrix verify that MP3393EF-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3393EF-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 MP3393EF-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3393EF-LF-Z?
All MP3393EF-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3393EF-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 MP3393EF-LF-Z part is unused and in its original packaging.
Return procedure for MP3393EF-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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