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Monolithic Power Systems Inc. MP3398AGY-P
- Part No.:
- MP3398AGY-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3398AGY-P.pdf
- Description:
- 4-CHANNEL(350MA EACH)BOOST WLED
- Quantity:
- Payment:
- Shipping:
Inventory:2,231
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Product details
Overview
MP3398AGY-P from Monolithic Power Systems is a 4-string white LED step-up 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 output via external MOSFET switching at programmable frequencies (150–621 kHz).
For engineers reviewing the MP3398AGY-P datasheet, MP3398AGY-P pinout, MP3398AGY-P application, or MP3398AGY-P equivalent, this device is selected for high-accuracy multi-string WLED biasing in flat-panel displays where thermal robustness, OVP/OTP/LED open-short protection, and dual-dimming flexibility are required.
Technical Context
The MP3398AGY-P implements peak-current-mode control with fixed-frequency oscillator programmable via ROSC resistor. Its internal 6V LDO powers gate driver and logic, while four matched current sinks regulate LED string currents independently using ISET-resistor feedback and internal 1.225V reference.
It integrates cascading capability via ISENSE pin sharing, open/short LED detection through LEDX pin voltage monitoring (120–280mV UVLO, 5.8–6.8V OVP), and dual-dimming paths: PWM signal applied directly to PWM pin (200Hz–2kHz), or DC/analog signal (0.4–1.5V) or filtered PWM (>20kHz) applied to ADIM pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide-range DC supplies including 12V and 24V industrial rails without pre-regulation. |
| Max LED Current per String | 350mA - enables driving high-brightness LED arrays in large-format displays with single-chip control. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across all 4 strings without external calibration or trimming. |
| Switching Frequency Range | 150 kHz to 621 kHz - selectable via OSC resistor to optimize EMI, efficiency, and inductor size (e.g., 180 kHz at ROSC = 374 kΩ). |
| Dimming Support | Analog (0.4–1.5V DC) and PWM (200Hz–2kHz) - allows system-level brightness control compatibility with legacy and modern display timing controllers. |
| OVP Threshold Accuracy | 1.20–1.26V at OVP pin - sets overvoltage protection with ±2.5% tolerance, preventing damage during LED string failure or open-circuit events. |
| Thermal Shutdown | 150°C with 25°C hysteresis - provides recoverable protection against sustained overload or poor PCB thermal design. |
Pinout & Package
MP3398AGY-P is housed in SOIC20 package with exposed pad (not electrically connected per datasheet; recommended to tie to GND for thermal performance). Pin functions are validated per official MPS MP3398A Rev. 1.06 datasheet, Section "PIN FUNCTIONS".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | LED1–LED4 | Open-drain current sink outputs - connect LED string cathodes; each regulates current independently with <800mV dropout at 330mA. |
| 5 | COMP | Compensation node for step-up converter error amplifier - requires ceramic capacitor to GND for loop stability. |
| 6 | EN | Enable input with 1.8V high-threshold and 0.6V low-threshold - controls global IC operation with 200mV hysteresis. |
| 7 | PWM | Dedicated PWM dimming input - accepts 200Hz–2kHz signals; internally weak-pulled to GND when unused. |
| 8 | GND | Power and signal ground reference - must be low-impedance connection shared with VCC bypass and ISET resistor. |
| 9 | OSC | Oscillator frequency set - 1.23V regulated node; connects to GND via resistor to program switching frequency (e.g., 374kΩ → 180kHz). |
| 10 | ISET | LED current programming - 1.225V regulated reference; current set by RISET = 1.225V / ILED. |
| 11 | ADIM | Analog dimming input - accepts DC (0.4–1.5V) or filtered PWM (>20kHz); internal 10MΩ/100pF RC filter enables smooth amplitude control. |
| 12 | LED4 | Redundant LED4 label - same function as Pin 4; confirms dual labeling in SOIC20 layout per datasheet top view. |
| 13 | OVP | Over-voltage protection sense - resistor divider from boost output sets trip point at 1.23V; triggers shutdown if exceeded for >4μs. |
| 14 | ISENSE | Cascading current-sense input - monitors external inductor current for cycle-by-cycle limiting; tie to GND if not used. |
| 15 | GATE | N-MOSFET gate driver output - low-impedance sourcing/sinking (4.5Ω/2.5Ω typical) for efficient external switch control. |
| 16 | VIN | Main power input - supplies both IC logic and boost converter; requires local 4.7μF + 220μF bypassing. |
| 17 | VCC | Internal 6V LDO output - powers gate driver and internal circuitry; drops to 0V during shutdown; bypass with ceramic cap. |
| 18–20 | NC | No-connect pins - left unconnected per datasheet; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel independent current regulation | Enables simultaneous control of four physically separate LED strings without cross-talk or shared current path limitations. |
| Programmable OVP with resistor-divider interface | Allows precise overvoltage threshold setting (e.g., 36V or 48V bus) without external comparators or voltage references. |
| Recoverable thermal shutdown | Permits automatic resumption after die cools below 125°C, avoiding system latch-up during transient thermal overload. |
| Inductor/diode short protection with dual detection | Combines COMP-clamp timeout (512 cycles) and current-limit latch (4 cycles at VLMT ≥ 640mV) to prevent MOSFET destruction. |
| LED open/short fault marking | Identifies and disables faulty strings while maintaining regulation on remaining functional strings - critical for display reliability. |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
Use Scenario: Backlighting for 24–32 inch commercial desktop monitors with uniform edge-lit or direct-lit LED arrays. IC Role / Device Role / Timing Role: Primary WLED string controller managing four parallel channels, synchronized to display timing controller via PWM/ADIM inputs. Use Value: Delivers consistent luminance across full screen with <2.5% inter-string mismatch, eliminating visible banding or color shift under variable dimming. | Use Scenario: High-brightness video wall tiles requiring stable backlight across multiple adjacent panels with minimal thermal drift. IC Role / Device Role / Timing Role: Centralized LED driver enabling cascaded operation across multiple MP3398A ICs sharing one boost inductor bank. Use Value: Reduces BOM count and board area vs. discrete drivers while maintaining per-tile dimming control and fault isolation. |
| 2D/3D LCD TVs | Industrial HMI Displays |
Use Scenario: Local dimming zones in mid-size 43–55 inch LCD TVs supporting dynamic contrast enhancement algorithms. IC Role / Device Role / Timing Role: Zone-specific WLED controller receiving real-time dimming commands from TV SoC via PWM or analog voltage. Use Value: Supports rapid brightness transitions (<1ms response) and deep dimming (0–100%) without flicker or audible noise due to fixed-frequency architecture. | Use Scenario: Ruggedized medical or factory-floor displays operating continuously in 40–85°C ambient with strict safety compliance. IC Role / Device Role / Timing Role: Fault-tolerant backlight manager implementing LED open/short detection, OTP, and OVP per IEC 62368-1 requirements. Use Value: Ensures uninterrupted operation by disabling failed strings while sustaining illumination on remaining channels - avoids total display blackout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED backlight controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3398AGS | SOIC16 package, identical electrical specs and pinout mapping except fewer pins (no NC pins); thermal resistance θJA = 80°C/W vs. 72°C/W for AGY-P. | Limited to lower-power designs (<1.5W dissipation) due to higher thermal impedance; unsuitable for 350mA/string at high ambient temperatures. | Select AGS only for space-constrained layouts where SOIC16 footprint is mandatory and thermal margin ≥20°C is confirmed. |
| MP3398AGF | TSSOP16-EP package with exposed pad tied to GND; θJA = 45°C/W and θJC = 10°C/W - superior thermal performance but smaller creepage/clearance than SOIC20. | Better suited for compact, thermally dense PCBs with active cooling; less robust for high-humidity or high-voltage isolation requirements. | Prefer AGF for portable or fan-cooled systems; choose AGY-P when IPC-2221 creepage >5.0mm and long-term reliability in unventilated enclosures are critical. |
Compared with MP3398AGS and MP3398AGF, MP3398AGY-P offers the best balance of thermal derating headroom (θJA = 72°C/W), mechanical robustness (SOIC20 creepage), and pin accessibility for debug (dedicated NC pins for probing), making it optimal for industrial and broadcast-grade display designs.
Availability
MP3398AGY-P is available at Aetrix Electronics and suitable for desktop LCD flat panel displays, 2D/3D LCD TVs, and industrial HMI displays requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3398AGY-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 focus on energy-efficient DC-DC conversion, LED lighting, and motor control solutions.
The MP3398A product line targets large-format LCD backlighting applications, delivering precision multi-string current regulation, integrated protection, and flexible dimming to replace discrete LED driver architectures.
FAQ
What is the maximum allowable LED string voltage when using MP3398AGY-P?
The MP3398AGY-P does not impose a fixed maximum LED string voltage; instead, it regulates based on the highest forward voltage among the four strings. The absolute maximum voltage at any LEDX pin is +55V per Absolute Maximum Ratings, and OVP protection triggers when the OVP pin reaches 1.23V - corresponding to a user-defined output voltage (e.g., 48V with appropriate resistor divider). System-level limit is determined by external MOSFET VDS(max) and Schottky diode rating.
Can MP3398AGY-P drive more than four LED strings?
Yes - MP3398AGY-P supports cascading: two or more ICs can share a single inductive power source by connecting their ISENSE pins together. This allows expansion to 8, 12, or more strings while maintaining synchronized switching and current balancing across all channels, as confirmed in the "Cascading Capability" feature and Application Information section.
How does analog dimming differ from PWM dimming in MP3398AGY-P?
Analog dimming uses the ADIM pin to linearly scale LED current from 0% to 100% via 0.4–1.5V DC input, producing flicker-free output. PWM dimming applies a square wave (200Hz–2kHz) to the PWM pin, chopping the LED current at the source - preserving full current amplitude during ON time but reducing average brightness. Both modes operate independently and can be used simultaneously for hybrid dimming schemes.
Is the SOIC20 package of MP3398AGY-P lead-free and RoHS compliant?
Yes - MP3398AGY-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive (2011/65/EU). All MPS parts, including this variant, meet JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and undergo rigorous qualification per AEC-Q200 for stress testing, with green status verified on the official MPS Quality Assurance webpage.
What happens during an LED open-string fault?
When an LED string opens, its corresponding LEDX pin voltage drops below 196mV. MP3398AGY-P detects this within 4μs, marks the faulty string as disabled, and continues regulating the remaining strings using the highest active LEDX voltage as feedback reference. If all four strings open, the IC shuts down the boost converter entirely to prevent uncontrolled output voltage rise.
Does MP3398AGY-P require external compensation components?
Yes - the COMP pin requires an external RC network (typically a series RC or type-II/type-III compensator) connected to GND to stabilize the step-up converter's feedback loop. Datasheet Figure 1 shows COMP as the error amplifier output, and Application Information specifies that a ceramic capacitor must be placed from COMP to GND; exact values depend on chosen inductor, output capacitance, and load conditions.
MP3398AGY-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- 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:
- 100kHz ~ 500kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MP3398AGY-P FAQ
1.How can I place an order for MP3398AGY-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398AGY-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 MP3398AGY-P reliable?
The price and inventory of MP3398AGY-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398AGY-P is usually 5 days.
3.What payment methods are accepted for MP3398AGY-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398AGY-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398AGY-P?
MP3398AGY-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398AGY-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 MP3398AGY-P?
For technical support, including MP3398AGY-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398AGY-P requirements.
6.How does Aetrix verify that MP3398AGY-P is sourced from the original manufacturer or authorized distributors?
All MP3398AGY-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 MP3398AGY-P meets industry standards.
7.What is the process for return or replacement of MP3398AGY-P?
All MP3398AGY-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3398AGY-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 MP3398AGY-P part is unused and in its original packaging.
Return procedure for MP3398AGY-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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