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Monolithic Power Systems Inc. MP3398AGY-Z
- Part No.:
- MP3398AGY-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3398AGY-Z.pdf
- Description:
- IC LED DRV CTRL PWM 350MA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,579
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Product details
Overview
MP3398AGY-Z from Monolithic Power Systems is a 4-string white LED boost controller with analog and PWM dimming, designed for large LCD panel backlighting. It delivers up to 350mA per string, achieves ±2.5% current matching between strings, supports 5V–28V input, and regulates LED current via external ISET resistor (VISET = 1.22V). Used in flat-panel TVs and monitors where precise multi-string current balance and dual-dimming flexibility are required.
For engineers reviewing the MP3398AGY-Z datasheet, MP3398AGY-Z pinout, MP3398AGY-Z application, or MP3398AGY-Z equivalent, key selection criteria include its SOIC20 package footprint, 4-channel open-drain LED sink architecture, programmable 150–621 kHz switching frequency, integrated OVP/OTP/UVP/LED short-open protection, and dual-dimming support with independent ADIM/PWM inputs.
Technical Context
The MP3398AGY-Z implements peak-current-mode control with fixed-frequency oscillator (programmable via OSC pin resistor), internal 6V LDO (VCC) for gate drive and logic, and four matched current sinks (LED1–LED4) referenced to a common 1.22V ISET voltage. Its error amplifier (COMP) regulates output bus voltage by sensing the lowest active LEDX pin voltage to maintain minimum required headroom.
Dimming is implemented through two independent paths: PWM pin directly chops LED current at user-defined duty cycle, while ADIM pin accepts either DC (0.4–1.5V linear scaling) or high-frequency PWM (>20kHz) filtered internally. Protection includes latch-off OVP (1.23V threshold), recoverable thermal shutdown (150°C trip, 25°C hysteresis), and 4096-cycle short-string detection on LEDX pins exceeding 6.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - powers both IC logic and external MOSFET switch; supports wide-range industrial and display power rails. |
| Max LED Current per String | 350mA - enables driving high-brightness WLED arrays in large-format displays without external current amplification. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across 4 LED strings, critical for artifact-free backlighting in TVs and monitors. |
| Switching Frequency Range | 150–621 kHz - set by external ROSC resistor; balances EMI, inductor size, and efficiency for compact designs. |
| ISET Reference Voltage | 1.22V - stable internal reference allows precise LED current programming with standard metal-film resistors. |
| OVP Threshold | 1.23V at OVP pin - programmable overvoltage protection prevents damage during open-string fault conditions. |
| Thermal Shutdown | 150°C with 25°C hysteresis - recoverable protection avoids permanent latch-off during transient overload or poor heatsinking. |
Pinout & Package
MP3398AGY-Z is packaged in SOIC20 with exposed pad (not electrically connected per datasheet; recommended to tie to GND for thermal performance). Pin count and layout differ from SOIC16/TSSOP16-EP variants - SOIC20 provides dedicated pins for all 4 LED strings without multiplexing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | LED1–LED4 | Open-drain current-sink outputs - connect LED string cathodes here; each independently controlled for dimming and fault isolation. |
| 5 | GND | Power and signal ground reference - must be low-impedance connection to minimize noise coupling into sensitive analog nodes. |
| 6 | ISET | Current-setting reference node - 1.22V regulated input; sets per-string LED current via external resistor to GND. |
| 7 | ADIM | Analog dimming input - accepts 0.4–1.5V DC or >20kHz PWM; internal RC filter converts to analog control voltage. |
| 8 | PWM | Digital dimming input - direct PWM signal (200Hz–2kHz typical) chops LED current at source level for high-contrast dimming. |
| 9 | EN | Enable control - logic-high (>1.8V) activates IC; <0.6V disables all functions including bias regulators. |
| 10 | COMP | Error amplifier output - connects to external compensation network (capacitor + RC) to stabilize boost loop dynamics. |
| 11 | OSC | Oscillator frequency set - 1.23V-regulated node; external resistor to GND programs switching frequency (150–621 kHz). |
| 12 | OVP | Over-voltage protection sense - resistor divider from boost output sets trip point; 1.23V threshold triggers shutdown. |
| 13 | ISENSE | Peak-current mode sense - monitors external RSENSE voltage; used for cycle-by-cycle current limiting and cascading sync. |
| 14 | GATE | N-MOSFET gate driver output - drives external high-side switch; 4.5Ω source / 2.5Ω sink impedance supports fast switching. |
| 15 | VIN | Main power input - supplies IC bias and boost converter; requires local ceramic bypass (4.7µF X5R/X7R + bulk capacitor). |
| 16 | VCC | Internal 6V LDO output - powers gate driver and internal logic; must be bypassed to GND with ≥1µF ceramic capacitor. |
| 17–20 | NC | No-connect - unused pins in SOIC20 package; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel independent LED current sinks | Enables simultaneous, isolated control of four WLED strings without external current mirrors or op-amps. |
| Programmable switching frequency (150–621 kHz) | Allows optimization of magnetics size, efficiency, and EMI filtering for specific display form factors. |
| Dual dimming interface (PWM + ADIM) | Supports both high-contrast digital dimming and flicker-free analog dimming in same design - no hardware change needed. |
| Integrated open/short LED protection | Automatically detects and isolates faulty strings (OVP-triggered shutdown or 6.3V LEDX clamp) without external circuitry. |
| Recoverable thermal shutdown (150°C/125°C) | Prevents permanent failure during thermal overload; resumes operation after die cools below hysteresis threshold. |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
Use Scenario: Backlighting for 24–32 inch commercial desktop monitors requiring uniform brightness and low-power standby. IC Role / Device Role / Timing Role: Primary WLED boost controller managing four parallel LED strings, regulating current via ISET resistor and adjusting brightness via ADIM voltage. Use Value: ±2.5% current matching eliminates visible vertical banding; 5V–28V input range accommodates universal AC-DC adapter outputs. | Use Scenario: High-brightness video wall tiles with dynamic local dimming zones driven by multiple MP3398A controllers sharing one boost stage. IC Role / Device Role / Timing Role: Cascaded LED string controller synchronized via ISENSE pin to share single inductive power source and reduce component count. Use Value: Cascading capability cuts BOM cost by eliminating redundant inductors and diodes per tile; SOIC20 layout simplifies routing of 4 LED return paths. |
| 2D/3D LCD TVs | Industrial HMI Displays |
Use Scenario: Main backlight driver in 43–75 inch consumer TVs supporting HDR content with deep dimming and fast response. IC Role / Device Role / Timing Role: Dual-dimming controller using PWM input for scene-based global dimming and ADIM for fine-grained local dimming control. Use Value: Independent PWM/ADIM inputs enable hybrid dimming schemes; 350mA/string rating supports high-luminance edge-lit configurations. | Use Scenario: Ruggedized medical or factory-floor displays operating in extended temperature ranges (–40°C to +125°C junction). IC Role / Device Role / Timing Role: Fault-tolerant LED driver with integrated OVP, OTP, UVP, and LED open/short detection for safety-critical lighting. Use Value: Full protection suite eliminates need for external supervisors; SOIC20 package offers better thermal dissipation than SOIC16 in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3398AGS-Z | SOIC16 package with shared LED1–LED4 pins (multiplexed), lower thermal resistance (θJA = 80°C/W vs. 72°C/W), no NC pins. | Compact board area but limited trace routing for 4 independent LED returns; less suitable for high-current layouts. | Select when space-constrained and thermal load ≤1.56W; verify PCB layout supports shared LED sink routing. |
| MP3398AGF-Z | TSSOP16-EP package with exposed pad tied to GND; best thermal performance (θJA = 45°C/W, θJC = 10°C/W). | Superior heat dissipation for high-ambient or sealed environments; requires thermal pad soldering and stencil design. | Select for high-power density designs or ambient temperatures >85°C; ensure proper thermal pad reflow profile. |
Compared with MP3398AGS-Z and MP3398AGF-Z, the MP3398AGY-Z's SOIC20 layout provides dedicated pins for all four LED strings, simplifying PCB routing and improving noise immunity - ideal for production displays where layout repeatability and testability outweigh minor thermal margin differences.
Availability
MP3398AGY-Z is available at Aetrix Electronics and suitable for desktop LCD flat panels, flat-panel video displays, and 2D/3D LCD TVs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3398AGY-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 power management ICs, with over 20 years of expertise in DC-DC conversion, LED drivers, and motor control.
The MP3398A product line targets large-format LCD backlighting, emphasizing multi-string current matching, dual-dimming flexibility, and robust fault protection for commercial and consumer display applications.
FAQ
What is the function of the ISENSE pin on MP3398AGY-Z?
The ISENSE pin monitors the voltage across the external current-sense resistor (RSENSE) to implement peak-current-mode control and cycle-by-cycle overcurrent limiting. In cascaded configurations, it synchronizes multiple MP3398A ICs to share one boost inductor and diode, reducing system component count and improving efficiency.
Can MP3398AGY-Z operate without an external MOSFET?
No. MP3398AGY-Z is a controller-only IC and requires an external N-channel MOSFET connected to the GATE pin to build the step-up converter. The GATE driver provides 4.5Ω sourcing and 2.5Ω sinking impedance, optimized for standard logic-level MOSFETs with QG < 30nC.
How does open-string protection work on MP3398AGY-Z?
When an LED string opens, its corresponding LEDX pin voltage drops below 196mV. The IC detects this condition, stops switching when the OVP pin voltage exceeds 1.23V (indicating unregulated bus rise), and marks the faulty string. Remaining strings continue regulation using the highest LEDX voltage as feedback reference.
What is the minimum recommended PWM dimming frequency for MP3398AGY-Z?
The datasheet specifies 200Hz as the lower limit for reliable PWM dimming. Below this, audible noise and visible flicker may occur. For optimal performance, use 1–2kHz PWM signals - this ensures full current settling within each on-cycle and maintains consistent brightness across dimming ratios.
Is the ADIM pin compatible with DC voltage input?
Yes. The ADIM pin accepts a 0.4V–1.5V DC input to linearly scale LED current from 0% to 100%. This enables smooth, flicker-free analog dimming without external filtering. If using PWM on ADIM, frequencies >20kHz are required to leverage the internal 10MΩ/100pF RC filter for clean DC-equivalent control voltage generation.
Does MP3398AGY-Z support daisy-chaining for more than four LED strings?
Yes - up to two or more MP3398A ICs can be cascaded using the ISENSE pin to share a single inductive power source. This configuration maintains independent current regulation per string while reducing total inductor count, PCB area, and EMI sources in large-backlight systems.
What is the purpose of the NC pins in the SOIC20 package?
Pins 17–20 in the SOIC20 package are designated No Connect (NC) per the official MPS datasheet. They serve no electrical function and must remain unconnected on the PCB. Their presence accommodates pinout compatibility across package variants and provides mechanical stability during handling and reflow.
MP3398AGY-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 4
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- -
- Current - Output / Channel:
- 350mA
- Frequency:
- 540kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MP3398AGY-Z FAQ
1.How can I place an order for MP3398AGY-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398AGY-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 MP3398AGY-Z reliable?
The price and inventory of MP3398AGY-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398AGY-Z is usually 5 days.
3.What payment methods are accepted for MP3398AGY-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398AGY-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398AGY-Z?
MP3398AGY-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398AGY-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 MP3398AGY-Z?
For technical support, including MP3398AGY-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398AGY-Z requirements.
6.How does Aetrix verify that MP3398AGY-Z is sourced from the original manufacturer or authorized distributors?
All MP3398AGY-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 MP3398AGY-Z meets industry standards.
7.What is the process for return or replacement of MP3398AGY-Z?
All MP3398AGY-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3398AGY-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 MP3398AGY-Z part is unused and in its original packaging.
Return procedure for MP3398AGY-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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