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Monolithic Power Systems Inc. MP3389EY-LF-Z
- Part No.:
- MP3389EY-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3389EY-LF-Z.pdf
- Description:
- IC LED DRVR CTRL PWM 60MA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
MP3389EY-LF-Z from Monolithic Power Systems is a 12-string, step-up white LED driver IC designed for large LCD panel backlighting. It integrates a fixed-frequency current-mode boost controller and 12 matched current sinks (±2.5% matching), supports 5–28V input, delivers up to 60mA per string, and regulates LED current via external ISET resistor with 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-Z datasheet, MP3389EY-LF-Z pinout, MP3389EY-LF-Z application, or MP3389EY-LF-Z equivalent, key selection criteria include programmable switching frequency (100–500 kHz), internal PWM dimming generation (via BOSC capacitor), open/short LED protection logic, and SOIC-28 package thermal performance (θJA = 60°C/W).
Technical Context
The MP3389EY-LF-Z implements peak-current-mode control with programmable oscillator (ROSC) and integrated 5V LDO (VCC) for gate drive and internal circuitry. Its 12 open-drain LEDX outputs each sink up to 60mA with 550mV compliance voltage, enabling efficient current regulation across parallel strings.
Dimming is supported via dual modes: external PWM on DBRT (with 100kΩ pull-down on BOSC) or DC-input PWM using BOSC capacitor-timed internal oscillator (1.2–1.6 kHz typical). Protection includes OVP (1.23V threshold at OVP pin), LEDX UVLO (180mV), short-string detection (>5.5V on LEDX), and thermal shutdown at 130°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - powers both IC core and external boost MOSFET; supports wide industrial and display supply rails. |
| LED String Count | 12 independent channels - enables full-array backlighting for 4K+ LCD panels without external current-sharing components. |
| Max Current per String | 60mA - sufficient for high-brightness white LEDs in TV backlights; set precisely via ISET resistor (1.22V reference). |
| Current Matching Accuracy | ±2.5% - ensures luminance uniformity across all 12 strings; critical for artifact-free large-screen imaging. |
| Switching Frequency Range | 100 kHz to 500 kHz - adjustable via ROSC resistor; balances efficiency, EMI, and external component size (inductor/capacitor). |
| Dimming Control | External PWM or internal DPWM (BOSC capacitor-set) - supports 0.3–100% duty cycle; avoids audible noise with >1 kHz internal frequency. |
| OVP Threshold | 1.23V at OVP pin - triggers shutdown when output overvoltage occurs due to open LED string; programmable via resistor divider. |
| Thermal Shutdown | 130°C - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
Pinout & Package
MP3389EY-LF-Z uses a 28-pin SOIC package (body width 7.5mm, lead pitch 1.27mm) with θJA = 60°C/W and θJC = 30°C/W. Pin 1 is top-left corner (dot-marked); pins 1 and 28 are NC; pin 25 is PGND (power ground); pin 26 is GATE (N-MOS driver output); pin 27 is VFAULT (PMOS fault disconnect control).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 2 VIN | Power Input | Supplies IC bias and boost converter; must be bypassed locally; accepts 5–28V. |
| 3 VCC | LDO Output | Internal 5V rail for gate driver and logic; requires ceramic bypass capacitor to GND. |
| 5 EN | Enable Input | Active-high digital control; 1.6V threshold; must not float; initiates soft-start sequence. |
| 6 DBRT | Brightness Control | Accepts external PWM (0.4V low / 1.2V min high) or DC analog (0.2–1.2V) for linear dimming duty mapping. |
| 8 OSC | Oscillator Set | Connects to GND via ROSC resistor; sets boost switching frequency (fSW ≈ 67.85 kΩ / ROSC). |
| 9 ISET | Current Reference | Sinks 1.22V reference current; RSET defines LED current (ILED = 1220 / RSET in kΩ). |
| 10 BOSC | Dimming Oscillator | Connects to GND via CBOSC capacitor; sets internal DPWM frequency (1.2–1.6 kHz typical). |
| 11–22 LED1–LED12 | LED String Sinks | Open-drain outputs; each sinks up to 60mA; connect LED cathodes directly; unused pins tied to VIN. |
| 23 OVP | Over-Voltage Sense | Resistor-divider input; trips at 1.23V; disables boost if output exceeds programmed threshold. |
| 24 ISENSE | Inductor Current Sense | Monitors external sense resistor voltage; enables peak-current-mode control and cycle-by-cycle limiting. |
| 26 GATE | Boost MOSFET Driver | Drives external N-channel MOSFET gate; 4Ω source / 2Ω sink impedance at 5V. |
| 27 VFAULT | Fault Disconnect Control | Drives external PMOS gate; disconnects input from output during fault or shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| 12-Channel Current Matching | ±2.5% matching between strings - eliminates brightness gradients in multi-zone LCD backlights without calibration. |
| Low Compliance Voltage | 550mV at LEDX pins - minimizes power loss in current sinks; improves system efficiency especially at high LED forward voltages. |
| Programmable Dimming Frequency | Internally generated DPWM (1.2–1.6 kHz) - avoids audible noise while enabling smooth 0.3–100% brightness control. |
| Comprehensive Fault Protection | Open-string (OVP + LEDX UVLO), short-string (LEDX OV >5.5V), UVLO (3.9V), and thermal shutdown (130°C) - ensures robust field operation. |
| Integrated 5V LDO | VCC output (4.5–5.5V, 10mA max) - powers internal gate driver and logic; eliminates need for external bias supply. |
| SOIC-28 Package | Standard footprint with exposed pad option (not present in EY variant) - compatible with legacy PCB layouts and automated assembly. |
Applications
| Desktop LCD Monitors | LCD Televisions |
|---|---|
|
Use Scenario: Driving 12 parallel WLED strings behind 27–32 inch IPS panels with local dimming zones. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages string current balance and PWM dimming timing synchronization. Use Value: Enables uniform luminance and contrast across full screen with <2.5% inter-string current variation, reducing visual banding artifacts. |
Use Scenario: Backlighting 43–75 inch UHD LCD TVs with dynamic contrast enhancement. IC Role / Device Role / Timing Role: Centralized WLED driver with integrated OVP and short-string protection; coordinates dimming across all strings using single DBRT signal. Use Value: Eliminates need for discrete current mirrors or op-amps; reduces BOM count by 12× vs. single-string drivers while maintaining safety compliance. |
| Flat Panel Video Displays | Commercial Digital Signage |
|
Use Scenario: High-brightness outdoor kiosks requiring 5000+ nits output with thermal derating. IC Role / Device Role / Timing Role: High-efficiency boost controller with 550mV LEDX compliance; manages thermal shutdown coordination across 12 strings. Use Value: Maintains stable brightness under ambient temperature swings (−40°C to +85°C operating range) with automatic fault recovery. |
Use Scenario: 24/7 operation in retail signage with remote brightness scheduling via PWM input. IC Role / Device Role / Timing Role: Industrial-grade LED driver with programmable dimming frequency and robust ESD tolerance (HBM >2kV). Use Value: Supports scheduled dimming profiles without microcontroller intervention; extends LED lifetime via precise current regulation. |
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 | TSSOP-28 package (θJA = 32°C/W); identical electrical specs and pinout except NC pin locations differ. | Better thermal performance in space-constrained designs; requires different land pattern and reflow profile. | Select EF for higher-power density layouts where board area is limited and thermal vias are feasible. |
| RT8585GQW | 8-string driver (not 12); uses external current sense resistors per string; no integrated OVP comparator. | Lacks native open-string protection; requires additional components for fault coverage equivalent to MP3389. | Choose only if channel count reduction is acceptable and system-level OVP can be implemented externally. |
Compared with MP3389EF-LF-Z, the MP3389EY-LF-Z offers lower thermal resistance in SOIC but requires more PCB area; versus RT8585GQW, it provides native 12-string integration and complete fault protection-reducing design risk and validation effort for large-panel backlighting.
Availability
MP3389EY-LF-Z is available at Aetrix Electronics and suitable for LCD TV manufacturing, commercial display production, and industrial monitor design requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP3389EY-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 design centers in the US, China, and Taiwan.
The MP3389 belongs to MPS's LED backlight driver product line, engineered specifically for large-format LCD displays requiring high channel count, tight current matching, and integrated protection-targeting cost-sensitive yet reliability-critical consumer and commercial applications.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP3389EY-LF-Z has an input UVLO threshold of 3.9V (typical) with 200mV hysteresis. Reliable startup requires VIN ≥ 4.5V under load, as specified in the Recommended Operating Conditions. Below this, the internal 5V LDO (VCC) cannot regulate, preventing gate drive and control logic activation.
How is LED current accuracy affected by temperature?
LED current regulation maintains ±2.5% matching across −40°C to +125°C junction temperature, per datasheet testing. The 1.22V ISET reference exhibits <100 ppm/°C drift, and current-sink compliance voltage (550mV) remains stable, ensuring consistent brightness over full industrial temperature range.
Can MP3389EY-LF-Z drive mixed LED forward voltages across strings?
Yes-the MP3389EY-LF-Z automatically selects the highest active LEDX pin voltage as the feedback reference, ensuring sufficient bus voltage for all strings. Each string operates independently; forward voltage mismatches up to 5V are accommodated without current deviation beyond ±2.5%.
What external components are mandatory for basic operation?
Mandatory components include: input capacitor (4.7μF X7R + 220μF electrolytic), output capacitor (4.7μF X7R + 10μF electrolytic), ROSC resistor (sets fSW), RSET resistor (sets ILED), CBOSC capacitor (sets DPWM frequency), and external boost MOSFET with Schottky diode and inductor. OVP resistor divider is required for fault protection.
Does MP3389EY-LF-Z support analog dimming?
No-it does not support true analog (linear) dimming. It supports only PWM-based methods: external PWM signal on DBRT or DC-input PWM (0.2–1.2V applied to DBRT, converted internally to DPWM). There is no voltage-controlled current scaling mode.
How does open-string protection behave when multiple strings fail?
When one or more strings open, the MP3389EY-LF-Z detects LEDX pin voltage <180mV, marks off those strings, and regulates output using only remaining functional strings. If all 12 strings open, the boost converter shuts down completely and VFAULT turns off the input PMOS.
Is the SOIC-28 package of MP3389EY-LF-Z lead-free and RoHS compliant?
Yes-MP3389EY-LF-Z carries the "LF" suffix indicating lead-free, RoHS-compliant construction per EU Directive 2011/65/EU. All solderable terminations use matte tin plating, and the mold compound is halogen-free per IEC 61249-2-21.
MP3389EY-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- 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:
- 60mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MP3389EY-LF-Z FAQ
1.How can I place an order for MP3389EY-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3389EY-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 MP3389EY-LF-Z reliable?
The price and inventory of MP3389EY-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 MP3389EY-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3389EY-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3389EY-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3389EY-LF-Z?
MP3389EY-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3389EY-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 MP3389EY-LF-Z?
For technical support, including MP3389EY-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3389EY-LF-Z requirements.
6.How does Aetrix verify that MP3389EY-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3389EY-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 MP3389EY-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3389EY-LF-Z?
All MP3389EY-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3389EY-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 MP3389EY-LF-Z part is unused and in its original packaging.
Return procedure for MP3389EY-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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