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Monolithic Power Systems Inc. MP3398HGS-Z
- Part No.:
- MP3398HGS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3398HGS-Z.pdf
- Description:
- 4-STRING, MAX 400MA/STRING, 80V
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
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Product details
Overview
MP3398HGS-Z from Monolithic Power Systems is a 4-string step-up WLED controller for large LCD backlighting, supporting up to 400mA per string, 80V absolute maximum string voltage, fixed-frequency peak-current-mode control with external ROSC resistor setting (400–600 kHz), and 1.5% inter-string current matching accuracy. It drives an external N-channel MOSFET to boost 4.5V–33V input to ≥80V output for driving high-series LED arrays in commercial displays.
For engineers reviewing the MP3398HGS-Z datasheet, MP3398HGS-Z pinout, MP3398HGS-Z application, or MP3398HGS-Z equivalent, this device requires attention to ISET resistor selection for precise current setting, OVP resistor divider configuration for open-string protection, cascading COMP pin connection for multi-IC expansion, and PWM/ADIM dimming interface compatibility with system-level brightness control architecture.
Technical Context
The MP3398HGS-Z implements fixed-frequency peak-current-mode control with cycle-by-cycle ISENSE sensing (540 mV threshold) and internal 5.9 V LDO (VCC) powering gate driver and logic. Its four independent open-drain LEDx outputs each tolerate 80 V, enabling direct cathode-side current regulation across diverse LED string configurations.
It supports three dimming modes: direct PWM (via PWM pin, ADIM pulled high), analog dimming via filtered PWM (capacitor on ADIM + PWM input ≥20 kHz), and DC analog dimming (0–1.5 V on ADIM with PWM pin tied high/low). Protection includes recoverable OVP (configurable via resistor divider), hiccup-mode OTP (150°C trip, 25°C hysteresis), and short/open detection per LED string.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 33 V - powers IC and enables wide-input industrial/commercial supply compatibility without pre-regulation. |
| Max LED String Voltage | 80 V - supports up to ~20 white LEDs in series per string at typical forward voltage (3.8 V avg). |
| Per-String Current Accuracy | ±1.5% matching - ensures uniform luminance across all four strings without external trimming or calibration. |
| Switching Frequency | 400–600 kHz (configurable via ROSC) - balances EMI, inductor size, and efficiency for compact display power designs. |
| Current Sense Threshold | 540 mV (cycle-by-cycle) - sets peak inductor current limit to protect MOSFET and inductor under transient overload. |
| Dimming Interface | PWM pin + ADIM pin - enables simultaneous support of legacy PWM dimming and smooth analog dimming without external DACs. |
| OVP Threshold | 2.0 V (typical) - triggers shutdown when output exceeds configured level, preventing overvoltage stress on LEDs and diode. |
| Thermal Shutdown | 150°C with 25°C hysteresis - provides self-recovering fault response during sustained thermal overload in enclosed enclosures. |
Pinout & Package
MP3398HGS-Z is housed in a 16-pin SOIC package with exposed pad (not thermally enhanced per datasheet), optimized for surface-mount assembly and thermal dissipation in display power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13–16 (LED4, LED1–LED3) | Open-drain LED string cathode drivers | Each sinks regulated current to ground; tolerates 80 V reverse voltage; enables individual string dimming and open/short detection. |
| 2 (ISET) | Current reference input | Connects to ground via resistor (e.g., 12 kΩ → 100 mA/string); sets all four string currents identically with 1.5% matching. |
| 3 (OVP) | Configurable over-voltage sense | Accepts resistor divider from VOUT; triggers shutdown if divided voltage exceeds 2.0 V, protecting LEDs and diode. |
| 4 (OSC) | Switching frequency programming | ROSC-to-ground sets fSW (e.g., 100 kΩ → 500 kHz); determines inductor size, ripple, and EMI profile. |
| 5 (EN) | Enable control input | Logic-level enable: >1.5 V = active, <0.6 V = shutdown; prevents floating; used for system-level power sequencing. |
| 6 (ISENSE) | Peak current sense input | Senses voltage across external RSENSE; enables cycle-by-cycle current limiting and cascading master/slave operation. |
| 7 (GATE) | N-MOSFET gate driver output | Drives external high-side N-channel MOSFET; 4 Ω source / 2.5 Ω sink impedance supports fast switching with low gate loss. |
| 8 (VCC) | Internal 5.9 V LDO output | Powers internal circuitry and gate driver; requires local ceramic bypass; UVLO (4.0 V) ensures stable startup. |
| 9 (VIN) | Main power input | 4.5–33 V supply; must be locally bypassed; powers VCC LDO and supplies energy to boost converter. |
| 10 (ADIM) | Analog dimming control input | Accepts 0–1.5 V DC or PWM-filtered signal; internal 100 kΩ resistor forms RC filter with external capacitor for analog dimming. |
| 11 (COMP) | Error amplifier compensation node | Connects to GND via RC network; stabilizes feedback loop for VOUT regulation; shared in cascaded configurations. |
| 12 (PWM) | Digital dimming control input | Direct PWM input (≥1.5 V high, ≤0.4 V low); controls average LED current via duty cycle when ADIM = VCC. |
| 15 (GND) | Signal and power ground reference | Common return for all analog/digital functions; PCB layout requires separation from high-current power ground with single-point tie. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent LED current channels | Enables full backlight control for dual-zone or quad-zone LCD panels without external current mirrors or op-amps. |
| Cascading capability with shared COMP | Allows two or more MP3398HGS-Z ICs to drive up to 8+ strings from one boost stage, reducing BOM count and board area. |
| 1.5% inter-string current matching | Eliminates visible brightness variation between zones; meets commercial display uniformity requirements without post-calibration. |
| Configurable, recoverable OVP | Prevents catastrophic failure during LED open-circuit faults while allowing automatic recovery after fault removal. |
| Hiccup-mode thermal protection | Shuts down only during sustained overtemperature; resumes operation once die cools, avoiding system lockup in thermal transients. |
| Three dimming modes (PWM/Analog-DC/Analog-PWM) | Supports legacy display timing controllers, modern MCU-based dimming, and hybrid systems-no firmware or hardware redesign needed. |
Applications
| Desktop LCD Flat-Panel Displays | All-in-One PCs |
|---|---|
|
Use Scenario: Driving 4 parallel LED strings behind 24–32 inch IPS panels with 120–200 nits brightness and 10,000:1 contrast ratio. IC Role / Device Role / Timing Role: Step-up controller regulating constant current per string while synchronizing PWM dimming with display frame rate (60–120 Hz). Use Value: Achieves uniform backlight intensity across panel edges and corners using 1.5% current matching, eliminating visible banding in grayscale images. |
Use Scenario: Backlighting integrated 27-inch touch-enabled AIO with dynamic local dimming zones controlled by embedded microcontroller. IC Role / Device Role / Timing Role: Primary WLED driver with cascaded second MP3398HGS-Z for 8-string operation; receives analog dimming commands via I²C-to-ADIM DAC. Use Value: Enables real-time brightness adaptation to ambient light sensors without adding discrete DACs or PWM generators-reducing component count by 3 parts per zone. |
| 2D LCD TVs | 3D LCD TVs |
|
Use Scenario: Powering edge-lit 43–55 inch 4K UHD TV backlights with 4–6 LED strings per side, requiring <1% luminance deviation. IC Role / Device Role / Timing Role: Constant-current WLED controller operating at 500 kHz switching frequency to minimize audible noise and EMI near HDMI receivers. Use Value: Delivers 400 mA per string at 75 V output with <360 mV LED regulation voltage, reducing conduction loss by 18% vs. competitive controllers. |
Use Scenario: Supporting active-shutter 3D mode requiring rapid, synchronized backlight strobing at 120 Hz with zero crosstalk between left/right frames. IC Role / Device Role / Timing Role: High-speed PWM dimming controller with <100 ns propagation delay from PWM pin to LEDx turn-off, enabling sub-frame blanking. Use Value: Maintains full 400 mA string current during 2 ms strobe pulses while achieving <1 µs dimming edge fidelity-critical for flicker-free 3D viewing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RTQ2132B-QA | Integrated MOSFET (30 V max), 2-string only, no cascading support, lower max string voltage (36 V). | Suitable for smaller panels (<24″) with lower LED count; lacks 80 V rating and 4-string flexibility. | Select only for cost-sensitive, space-constrained designs where 4-string and 80 V capability are unnecessary. |
| LM3409QMY/NOPB | Single-string buck-boost controller, no integrated current matching, requires external current sources per string. | Requires 4× LM3409QMY + 4× op-amp current mirrors to match MP3398HGS-Z functionality-increasing BOM and layout complexity. | Choose only if existing design uses LM3409QMY and migration path requires minimal schematic change-not for new designs. |
Compared with RTQ2132B-QA and LM3409QMY/NOPB, MP3398HGS-Z uniquely delivers 4-string current matching at 80 V with cascading support and triple dimming mode flexibility-making it the only single-package solution for mid-to-large commercial LCD backlighting requiring uniformity, scalability, and interface adaptability.
Availability
MP3398HGS-Z is available at Aetrix Electronics and suitable for desktop LCD flat-panel displays, all-in-one PCs, and 2D/3D LCD TVs requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for MP3398HGS-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 converters, LED drivers, and motor drivers.
The MP3398H product line targets large-format LCD backlighting applications, emphasizing high-voltage string tolerance, precision current matching, and flexible dimming to meet commercial display OEM requirements for reliability and visual quality.
FAQ
What is the minimum recommended ISET resistor value for MP3398HGS-Z?
The datasheet specifies a minimum ISET current of 100 µA to ensure proper biasing of the internal reference. With VISET = 1.5 V (typ), the minimum resistor is 1.5 V / 100 µA = 15 kΩ. Using RISET < 15 kΩ risks exceeding 400 mA per string and violating absolute maximum ratings on LEDx pins.
Can MP3398HGS-Z operate with VIN = 5 V and VOUT = 75 V simultaneously?
Yes - the device supports VIN as low as 4.5 V and regulates up to 80 V string voltage. At VIN = 5 V and VOUT = 75 V, the required duty cycle is ~87%, which remains within the 90% maximum specified. However, efficiency drops significantly below 8 V VIN due to higher RMS input current and gate drive losses.
How does open-string protection behave when two of four strings fail open?
The MP3398HGS-Z detects open strings by monitoring VLEDx < 200 mV and marks them off. With two strings open, the remaining two continue regulation at full current. VOUT automatically adjusts downward to the lowest forward voltage among active strings, maintaining safe operation without latching off.
Is the OSC pin compatible with voltage-controlled frequency tuning?
No - the OSC pin is designed exclusively for current-source-based frequency setting via ROSC-to-GND. Applying a voltage or AC signal to OSC violates the absolute maximum rating (−0.3 V to +6.5 V) and may damage the internal oscillator circuit. Frequency adjustment must be done only with resistor changes.
What is the purpose of connecting slave ICs' ISENSE pins to GND in cascaded configurations?
In cascade mode, only the master IC performs current sensing and switching control. Connecting slave ISENSE to GND disables its current-limit function and prevents conflict with the master's ISENSE signal. Leaving it floating would cause undefined behavior and potential false OCP triggering.
Does MP3398HGS-Z support spread-spectrum frequency modulation (SSFM)?
No - the MP3398HGS-Z uses a fixed-frequency oscillator with no SSFM capability. Its switching frequency is set solely by the external ROSC resistor. For EMI reduction, designers must rely on layout optimization, input/output filtering, and selecting fSW values outside sensitive bands (e.g., avoiding 150–200 kHz AM radio band).
What happens to LED current regulation if the COMP pin is left unconnected?
Leaving COMP unconnected causes instability in the feedback loop, resulting in unregulated VOUT, oscillatory LED current, and potential OVP or OCP triggering. A minimum RC network (e.g., 1 nF capacitor + 10 kΩ resistor to GND) is mandatory for stable closed-loop operation per the datasheet design guidelines.
MP3398HGS-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):
- 33V
- Voltage - Output:
- 80V
- Current - Output / Channel:
- 400mA
- Frequency:
- 500kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP3398HGS-Z FAQ
1.How can I place an order for MP3398HGS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398HGS-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 MP3398HGS-Z reliable?
The price and inventory of MP3398HGS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398HGS-Z is usually 5 days.
3.What payment methods are accepted for MP3398HGS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398HGS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398HGS-Z?
MP3398HGS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398HGS-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 MP3398HGS-Z?
For technical support, including MP3398HGS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398HGS-Z requirements.
6.How does Aetrix verify that MP3398HGS-Z is sourced from the original manufacturer or authorized distributors?
All MP3398HGS-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 MP3398HGS-Z meets industry standards.
7.What is the process for return or replacement of MP3398HGS-Z?
All MP3398HGS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3398HGS-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 MP3398HGS-Z part is unused and in its original packaging.
Return procedure for MP3398HGS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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