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Monolithic Power Systems Inc. MP3398AGS-P
- Part No.:
- MP3398AGS-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3398AGS-P.pdf
- Description:
- 4-CHANNEL(350MA EACH)BOOST WLED
- Quantity:
- Payment:
- Shipping:
Inventory:1,056
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Product details
Overview
MP3398AGS-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 LED current via external ISET resistor (VISET = 1.22V). Used in desktop monitors and 2D/3D TVs where precise brightness control and multi-string uniformity are critical.
For engineers reviewing the MP3398AGS-P datasheet, MP3398AGS-P pinout, MP3398AGS-P application, or MP3398AGS-P equivalent, this page provides verified technical context on cascading capability, OVP threshold programming, thermal shutdown recovery, and dual-dimming mode interoperability - all essential for backlight power architecture validation.
Technical Context
The MP3398AGS-P implements peak-current-mode control with fixed-frequency switching (programmable 150–621 kHz via OSC resistor), using an external N-MOSFET to boost input (5–28V) to drive four independent LED strings. Its internal 6V LDO (VCC) powers gate driver and logic, with UVLO (4.0V rising edge) and 200mV hysteresis ensuring clean startup.
It integrates four matched current sinks (LED1–LED4) with 800mV regulation voltage at 330mA, enabling <2.5% inter-string current mismatch. Protection includes recoverable thermal shutdown (150°C trip, 125°C recovery), latch-off OVP (1.23V threshold at OVP pin), and short-string detection (6.3V LEDX overvoltage, 4096-cycle fault confirmation).
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 Output Current per String | 350mA - enables driving high-brightness WLED arrays (e.g., 12–20 LEDs/string @ 3.3V) in large-panel backlights. |
| Current Matching Accuracy | ±2.5% - ensures consistent luminance across all 4 strings, critical for uniform backlighting in monitors and TVs. |
| Dimming Support | Analog (0.4–1.5V ADIM) and PWM (200Hz–2kHz) - allows flexible brightness control without visible flicker or color shift. |
| Switching Frequency Range | 150–621 kHz - programmable via ROSC to optimize EMI, inductor size, and efficiency trade-offs. |
| OVP Threshold | 1.23V at OVP pin - sets output overvoltage protection level; 80mV hysteresis prevents chatter during transient events. |
| Thermal Shutdown | 150°C trip / 125°C recovery - recoverable protection avoids permanent latch-off during temporary overload or poor heatsinking. |
| ISET Reference Voltage | 1.22V - stable reference for precision current-setting resistor (e.g., 30.5kΩ yields 32.3mA/string). |
Pinout & Package
MP3398AGS-P is packaged in SOIC16 with exposed pad (non-EP variant per ordering code), pin-compatible with TSSOP16-EP and SOIC20 variants. Pin functions are validated per MPS datasheet Rev. 1.06 (2018).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | COMP | Compensation node for step-up converter control loop; requires ceramic capacitor to GND for stability. |
| 2 | EN | Enable input with 1.8V high-threshold and 0.6V low-threshold; must not float - ties to system enable rail. |
| 3 | PWM | PWM dimming control; accepts 200Hz–2kHz signals to chop LED current; internally weak-pull-down if unused. |
| 4 | GND | Power and signal ground reference; connects to PCB ground plane and exposed pad (if EP package used). |
| 5 | OSC | Oscillator frequency set node; 1.23V regulated voltage; ROSC resistor value determines fSW (e.g., 374kΩ → 180kHz). |
| 6 | ISET | LED current reference input; 1.22V regulated voltage; current set by external resistor to GND (e.g., 8.2kΩ → 120mA). |
| 7 | ADIM | Analog dimming input; accepts 0.4–1.5V DC or >20kHz PWM; internal RC filter enables smooth brightness scaling. |
| 8–11 | LED4–LED1 | Open-drain current sink outputs for LED string cathodes; each independently controlled for dimming and fault isolation. |
| 12 | OVP | Over-voltage protection sense input; resistor divider from boost output sets trip point at 1.23V. |
| 13 | ISENSE | Peak-current sensing input; monitors external RSENSE for cycle-by-cycle current limiting and cascading sync. |
| 14 | GATE | N-MOSFET gate driver output; drives external high-side switch with 4.5Ω source / 2.5Ω sink impedance. |
| 15 | VIN | Main power input (5–28V); supplies IC core and boost converter; requires local 4.7µF + 220µF bypassing. |
| 16 | VCC | Internal 6V LDO output; powers gate driver and internal logic; bypass with 1µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Cascading capability | Multiple MP3398A ICs can share one inductive power stage via ISENSE synchronization - reduces BOM count and improves system efficiency. |
| Recoverable thermal shutdown | Auto-restarts after die cools below 125°C - eliminates need for external reset circuitry in thermally constrained enclosures. |
| Independent dimming modes | PWM and analog dimming operate simultaneously or separately - enables hybrid dimming for ultra-low-frequency flicker suppression. |
| LED open/short protection | Detects open strings via OVP pin monitoring and short strings via LEDX >6.3V - disables faulty channel while maintaining others. |
| Programmable OVP | OVP threshold set by external resistor divider - allows precise match to LED string Vf variation and safety margin requirements. |
| Low VLEDX regulation voltage | 800mV at 330mA - minimizes power loss in current sinks, improving overall efficiency especially at high current loads. |
Applications
| Desktop LCD Monitors | Flat Panel Video Displays |
|---|---|
|
Use Scenario: 27-inch IPS monitor with 4-zone local dimming backlight requiring uniform luminance and flicker-free dimming. IC Role / Device Role / Timing Role: Primary WLED boost controller managing four parallel LED strings, regulating current and coordinating dimming timing across zones. Use Value: ±2.5% current matching ensures no visible banding; dual-dimming support enables seamless transition between ambient light-adaptive and user-controlled brightness modes. |
Use Scenario: Commercial digital signage display operating 24/7 with thermal management constraints and EMI-sensitive environment. IC Role / Device Role / Timing Role: High-efficiency LED driver with programmable 180kHz switching frequency to minimize conducted EMI and reduce inductor size. Use Value: Recoverable thermal shutdown prevents system lockup during extended operation; low 800mV VLEDX drop reduces heat generation in sealed chassis. |
| 2D LCD TVs | 3D LCD Monitors |
|
Use Scenario: 43-inch 2D TV backlight with dynamic contrast enhancement requiring fast-response dimming control. IC Role / Device Role / Timing Role: Core LED driver executing PWM dimming at 1kHz to synchronize with frame rate for motion blur reduction. Use Value: Dedicated PWM pin with 1.25V high-threshold ensures noise-immune triggering; 200ns blanking time prevents false current sensing during switching transitions. |
Use Scenario: Professional 3D stereo monitor needing independent left/right eye illumination control without crosstalk. IC Role / Device Role / Timing Role: Dual-role controller using ADIM for coarse global brightness and PWM for fine per-frame modulation of individual strings. Use Value: Internal RC filter on ADIM rejects high-frequency noise while preserving analog linearity; 0.4–1.5V range maps directly to 0–100% luminance scale. |
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 |
|---|---|---|---|
| MP3398AGF | TSSOP16-EP package with thermal pad; θJA = 45°C/W vs. SOIC16's 80°C/W - 44% lower junction-to-ambient resistance. | Better suited for high-power density designs with limited airflow; requires exposed pad soldering to PCB ground plane. | Select when thermal performance > package footprint; verify PCB land pattern matches TSSOP-EP mechanical drawing. |
| MP3398AGY | SOIC20 package with dedicated pins for ISENSE, GATE, and VCC - separates power and signal routing to reduce noise coupling. | Preferred for EMI-critical applications (e.g., medical displays) where layout isolation improves EMC compliance. | Choose when board space allows larger footprint and noise immunity outweighs cost premium of extra pins. |
Compared with MP3398AGS-P, MP3398AGF offers superior thermal dissipation in compact layouts, while MP3398AGY provides enhanced signal integrity through physical pin separation - both retain identical electrical functionality and pin mapping for core control signals.
Availability
MP3398AGS-P is available at Aetrix Electronics and suitable for desktop LCD monitors, flat panel video displays, and 2D/3D LCD TVs requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for MP3398AGS-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 power management ICs, with design focus on efficiency, integration, and reliability for consumer, industrial, and automotive markets.
The MP3398A product line targets large-format LCD backlighting, delivering multi-string LED control with programmable protection and dual-dimming flexibility to replace discrete boost+current-source solutions.
FAQ
What is the minimum recommended ISET resistor value for MP3398AGS-P?
The datasheet specifies a minimum LED current of 10mA per string. With VISET = 1.22V, the minimum resistor is R = 1.22V / 0.01A = 122Ω. However, practical use starts at 30.5kΩ (32.3mA) per string; values below 10kΩ risk excessive ISET pin current and reduced accuracy due to internal bias limitations.
Can MP3398AGS-P drive more than 4 LED strings?
Yes - the datasheet explicitly states cascading capability: two or more MP3398A ICs can share a single inductive power source by connecting their ISENSE pins together. This maintains synchronized switching and avoids beat-frequency artifacts in multi-IC backlight systems.
How does the MP3398AGS-P handle LED string failure?
It detects open strings via OVP pin voltage collapse (<75mV) and short strings via LEDX pin voltage exceeding 6.3V for 4096 cycles. Upon detection, it marks the faulty string OFF while continuing regulation on remaining strings - ensuring partial backlight operation rather than full system shutdown.
Is the ADIM pin compatible with microcontroller DAC outputs?
Yes - the ADIM pin accepts DC voltages from 0.4V to 1.5V for linear LED current control. A standard 12-bit MCU DAC (0–3.3V) with a resistive divider (e.g., 10kΩ + 15kΩ) delivers 0–1.32V, fully covering the usable range while staying within absolute max ratings.
What is the purpose of the 200ns blanking time in the current-sense path?
The 200ns blanking time disables ISENSE sampling immediately after GATE turns on, preventing false overcurrent trips caused by MOSFET turn-on spikes and parasitic ringing. This ensures accurate peak-current detection only during stable conduction phase.
Does MP3398AGS-P support spread-spectrum frequency modulation?
No - the datasheet confirms fixed-frequency peak-current-mode control with oscillator frequency set solely by external ROSC resistor. There is no internal dithering or spread-spectrum capability; EMI reduction relies on optimal PCB layout and external filtering.
What happens if the EN pin is left floating?
The EN pin has no internal pull-up or pull-down; floating causes undefined state and potential erratic startup or oscillation. The datasheet mandates explicit connection - tie to VIN via resistor divider or microcontroller GPIO to ensure reliable enable/disable sequencing aligned with power rail ramp rates.
MP3398AGS-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 16-SOIC
MP3398AGS-P FAQ
1.How can I place an order for MP3398AGS-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398AGS-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 MP3398AGS-P reliable?
The price and inventory of MP3398AGS-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398AGS-P is usually 5 days.
3.What payment methods are accepted for MP3398AGS-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398AGS-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398AGS-P?
MP3398AGS-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398AGS-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 MP3398AGS-P?
For technical support, including MP3398AGS-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398AGS-P requirements.
6.How does Aetrix verify that MP3398AGS-P is sourced from the original manufacturer or authorized distributors?
All MP3398AGS-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 MP3398AGS-P meets industry standards.
7.What is the process for return or replacement of MP3398AGS-P?
All MP3398AGS-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3398AGS-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 MP3398AGS-P part is unused and in its original packaging.
Return procedure for MP3398AGS-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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