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Monolithic Power Systems Inc. MP3398LGS-Z
- Part No.:
- MP3398LGS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3398LGS-Z.pdf
- Description:
- IC LED DRV CTRL PWM 350MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,544
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Product details
Overview
MP3398LGS-Z from Monolithic Power Systems is a 4-string white LED boost controller with analog and PWM dimming support, designed for large LCD panel backlighting. It delivers up to 350mA per string, achieves ±2.5% current matching between strings, operates from 4.5V–28V input, and regulates LED current via external ISET resistor (VISET = 1.225V). Used in desktop monitors and 2D/3D TVs where precise multi-string current balance and dual-dimming flexibility are required.
For engineers reviewing the MP3398LGS-Z datasheet, MP3398LGS-Z pinout, MP3398LGS-Z application, or MP3398LGS-Z equivalent, this page provides verified technical context on its peak-current-mode boost architecture, SOIC16 pin mapping, cascading capability with shared inductive source, OVP/OTP/LED short-open protection, and real-world dimming implementation constraints including ADIM RC filtering (10MΩ/100pF) and PWM timing limits (200Hz–20kHz).
Technical Context
The MP3398LGS-Z implements fixed-frequency peak-current-mode control with programmable switching frequency (150–621 kHz) set by an external resistor on the OSC pin (regulated at 1.23V). Its internal error amplifier compares feedback from the lowest active LEDX pin to maintain minimum bus voltage sufficient for all strings.
It integrates four matched current sinks (LED1–LED4) with ≤2.5% inter-string regulation accuracy and low 800mV dropout at 330mA, reducing conduction loss. Protection includes recoverable thermal shutdown (150°C trigger, 25°C hysteresis), latch-off LED open/short detection (4096-cycle fault confirmation), and dual-path inductor/diode short sensing via ISENSE voltage clamping and cycle-by-cycle current limit (640mV threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-range DC supplies including 5V, 12V, and 24V industrial rails without pre-regulation. |
| Max Output Current per String | 350mA - enables driving high-brightness WLED arrays with up to 4 parallel strings. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across LCD backlight zones without external calibration. |
| Switching Frequency Range | 150–621 kHz - selectable via ROSC resistor; balances EMI, efficiency, and external component size (e.g., 180 kHz at 374kΩ). |
| ISET Reference Voltage | 1.225V - sets LED current linearly via external resistor (ILED = 1.225V / RSET); stable over temperature and line. |
| OVP Threshold | 1.225V at OVP pin - programmable overvoltage protection using resistor divider; triggers shutdown if output exceeds safe level due to open-string fault. |
| Thermal Shutdown | 150°C with 25°C hysteresis - recovers automatically after die cools, preventing permanent damage during transient overload. |
| Dimming Support | Independent analog (ADIM: 0.4–1.5V DC or >20kHz PWM) and PWM (PWM pin: 200Hz–20kHz) - enables hybrid dimming schemes for flicker-free video and low-noise audio environments. |
Pinout & Package
MP3398LGS-Z is housed in a 16-pin SOIC package with exposed pad (not thermally enhanced), footprint compatible with JEDEC MS-012AC. Pin 1 is marked with dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Loop Compensation Node | Connects to ceramic capacitor to ground; stabilizes feedback loop for step-up converter; affects transient response and phase margin. |
| 2 EN | Enable Control Input | Logic-level enable: ≥1.8V turns IC on; ≤0.6V disables operation; must not float; internal pull-down absent. |
| 3 PWM | PWM Dimming Signal Input | Accepts 200Hz–20kHz PWM signal; average LED current = ISET × duty cycle; low-level <0.75V, high-level >1.25V. |
| 4 GND | Power and Signal Ground | Common reference for all analog and digital circuitry; requires low-inductance connection to minimize noise coupling. |
| 5 OSC | Frequency Set Input | Connects to ROSC resistor to ground; internal 1.23V reference enables precise fSW programming (e.g., 180 kHz @ 374kΩ). |
| 6 ISET | LED Current Programming Input | Regulated at 1.225V; sets per-string current via external resistor (ILED = 1.225V / RSET); must not be left open. |
| 7 ADIM | Analog Dimming Input | Accepts DC (0.4–1.5V) or >20kHz PWM; internal 10MΩ/100pF RC filter converts PWM to DC-equivalent voltage. |
| 8–11 LED4–LED1 | LED String Cathode Outputs | Open-drain current sinks; each drives one WLED string cathode; voltage drop ≤800mV at 330mA ensures low power loss. |
| 12 OVP | Over-Voltage Protection Sense | Monitors output via resistor divider; triggers shutdown when voltage reaches 1.225V; enables programmable OVP threshold. |
| 13 ISENSE | Inductor Current Sense Input | Senses voltage across external RSENSE for peak-current mode control and cycle-by-cycle overcurrent limiting (640mV threshold). |
| 14 GATE | N-MOSFET Gate Driver Output | Drives external N-channel MOSFET gate; sourcing/sinking impedance 4.5–7Ω / 2.5–5Ω; supports fast turn-on/turn-off. |
| 15 VIN | Main Power Input | Supplies IC bias and boost switch; accepts 4.5–28V; requires local ceramic bypass (e.g., 4.7µF X5R + 220µF electrolytic). |
| 16 VCC | Internal 6V LDO Output | Provides regulated 6V for gate driver and internal logic; sourced from VIN; UVLO threshold 3.4V with 280mV hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| 4-String Independent Current Sinks | Each LEDX pin delivers up to 350mA with ≤2.5% matching - eliminates need for per-string current regulators in large-panel backlight designs. |
| Cascadable Architecture | Multiple MP3398LGS-Z ICs can share single boost inductor and diode - reduces BOM cost and board space in ultra-wide displays. |
| Dual Dimming Mode Flexibility | Simultaneous analog (ADIM) and PWM (PWM pin) inputs allow system-level dimming coordination - e.g., coarse analog + fine PWM for smooth 0.1%–100% range. |
| Comprehensive Fault Protection | Integrated OVP, OTP, UVP, LED open/short, and inductor/diode short detection - eliminates need for external monitoring circuits in safety-critical displays. |
| Low Dropout LED Sink Voltage | 800mV max at 330mA - minimizes power loss and thermal stress in high-current backlight applications. |
| Programmable Switching Frequency | 150–621 kHz via ROSC resistor - enables optimization for EMI compliance (e.g., 180 kHz avoids AM band) and efficiency trade-offs. |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
|
Use Scenario: 24–32 inch desktop monitors requiring uniform brightness and flicker-free dimming across full viewing angle. IC Role / Device Role / Timing Role: Primary WLED backlight controller managing 4 independent current channels with synchronized analog+PWM dimming. Use Value: Achieves <2.5% luminance variation across display surface while supporting 1000:1 contrast ratio via deep PWM dimming (0.75% min duty at 500Hz). |
Use Scenario: Commercial signage and kiosk displays operating 24/7 under variable ambient light conditions. IC Role / Device Role / Timing Role: High-reliability boost controller with recoverable thermal shutdown and open-string fault recovery to sustain uptime. Use Value: Maintains partial backlight operation even if one LED string fails - critical for mission-critical information displays. |
| 2D/3D LCD TVs | Industrial Control Panel Backlights |
|
Use Scenario: Dual-view 3D televisions requiring rapid, synchronized dimming of left/right eye zones without crosstalk. IC Role / Device Role / Timing Role: Dual-dimming-capable controller enabling independent ADIM/PWM control per zone for stereoscopic frame sequencing. Use Value: Enables sub-millisecond dimming transitions essential for active-shutter 3D systems while maintaining color fidelity. |
Use Scenario: Harsh-environment HMIs in factory automation where vibration, dust, and wide temperature swings occur. IC Role / Device Role / Timing Role: Robust LED driver with -40°C to +125°C junction rating and latch-off fault protection for long-term reliability. Use Value: Eliminates field failures from LED string opens/shorts in unattended equipment; supports predictive maintenance via fault flag reporting. |
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 |
|---|---|---|---|
| MP3394SGS-Z | 2-string, max 150mA/string; no cascading support; fixed 1MHz fSW; lacks ADIM pin and analog dimming. | Suitable only for smaller panels (<20") with lower current demand; cannot replace MP3398LGS-Z in 4-string or analog-dimming systems. | Select only when board space is constrained and dual-dimming is unnecessary; verify thermal derating at 150mA/string. |
| RT8532GQW | 4-string, 350mA/string; supports only PWM dimming (no analog input); uses different OVP architecture (internal comparator vs. resistor-divider referenced). | Compatible for basic PWM-only backlighting but requires redesign of dimming interface and OVP network; no ADIM RC filter integration. | Choose if analog dimming is unused and existing design already uses Richtek's ecosystem; validate OVP trip point re-calibration. |
Compared with MP3394SGS-Z and RT8532GQW, the MP3398LGS-Z uniquely combines 4-string 350mA capability, ±2.5% matching, dual analog/PWM dimming, and cascading-making it irreplaceable in high-end large-panel designs requiring luminance uniformity and flexible dimming control.
Availability
MP3398LGS-Z is available at Aetrix Electronics and suitable for desktop LCD flat panel displays, 2D/3D LCD TVs, and industrial control panel backlights requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3398LGS-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 MP3398L product line targets large-format LCD backlighting applications, emphasizing precision current matching, dual-dimming flexibility, and robust fault protection for commercial and consumer display systems.
FAQ
What is the maximum allowable LED string voltage that MP3398LGS-Z can regulate?
The MP3398LGS-Z does not directly regulate string voltage; instead, it regulates current through each string while the boost converter dynamically adjusts output voltage to meet the highest forward voltage requirement among the four strings. The absolute maximum voltage at any LEDX pin is 55V, and the OVP threshold is programmable up to ~6.8V at the LEDX pins. In practice, typical output voltages range from 30V to 45V depending on LED count and VF characteristics.
Can MP3398LGS-Z operate with only two LED strings connected?
Yes. The MP3398LGS-Z automatically detects active LEDX pins and regulates output voltage based on the highest forward voltage among connected strings. Unused LEDX pins (e.g., LED3 and LED4) must be left unconnected-not tied to ground or VOUT-as floating pins are internally weakly pulled down. Open-string protection remains active for any disconnected string.
How does the ADIM pin handle PWM signals, and what is the recommended frequency?
The ADIM pin includes an integrated 10MΩ resistor and 100pF capacitor forming a 16Hz low-pass filter. To avoid distortion and ensure accurate DC-equivalent voltage generation, PWM signals applied to ADIM must exceed 20kHz. At lower frequencies, the filter causes significant ripple and inaccurate dimming levels; DC input (0.4–1.5V) is preferred for stable analog control.
What happens during an LED short fault, and how is recovery handled?
When an LEDX pin voltage exceeds 6.3V for 4096 consecutive switching cycles, the MP3398LGS-Z marks that string as faulty and disconnects it from regulation. The remaining strings continue operation. Recovery occurs only after a full power cycle or EN pin toggle-no automatic reset. All strings shorted triggers immediate shutdown.
Is the GATE pin capable of driving high-side or low-side MOSFET configurations?
The GATE pin is designed exclusively for driving the gate of an external N-channel MOSFET configured as a low-side switch in a boost topology. It is not rated for high-side drive or bootstrap operation. The driver sourcing/sinking impedance (4.5–7Ω / 2.5–5Ω) and 6V VCC rail are optimized for standard low-side N-MOSFETs with VGS(th) < 3V.
Does MP3398LGS-Z support spread-spectrum frequency modulation to reduce EMI?
No. The MP3398LGS-Z uses a fixed-frequency oscillator controlled by the external ROSC resistor. It does not incorporate spread-spectrum modulation or dithering. EMI reduction must be achieved externally via layout optimization, input/output filtering, and careful selection of inductor core material and capacitor ESR.
What is the minimum recommended ISET resistor value, and why?
The minimum recommended ISET resistor is 3.48kΩ, corresponding to the maximum 350mA per string (RSET = 1.225V / 0.35A ≈ 3.5kΩ). Using a lower resistance risks exceeding the IC's current sink capability and may cause thermal overstress or regulation failure. The datasheet specifies 30.5kΩ for 32.9mA nominal, confirming scalability across the 10–350mA range.
MP3398LGS-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- 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):
- 4.5V
- 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:
- 16-SOIC
MP3398LGS-Z FAQ
1.How can I place an order for MP3398LGS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398LGS-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 MP3398LGS-Z reliable?
The price and inventory of MP3398LGS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398LGS-Z is usually 5 days.
3.What payment methods are accepted for MP3398LGS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398LGS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398LGS-Z?
MP3398LGS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398LGS-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 MP3398LGS-Z?
For technical support, including MP3398LGS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398LGS-Z requirements.
6.How does Aetrix verify that MP3398LGS-Z is sourced from the original manufacturer or authorized distributors?
All MP3398LGS-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 MP3398LGS-Z meets industry standards.
7.What is the process for return or replacement of MP3398LGS-Z?
All MP3398LGS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3398LGS-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 MP3398LGS-Z part is unused and in its original packaging.
Return procedure for MP3398LGS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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