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Monolithic Power Systems Inc. MP3398BGF-Z
- Part No.:
- MP3398BGF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP3398BGF-Z.pdf
- Description:
- IC LED DRVR CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,534
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Product details
Overview
MP3398BGF-Z 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 (1.22V reference). Used in desktop monitors and 2D/3D TVs where precise brightness control and thermal robustness are required.
For engineers reviewing the MP3398BGF-Z datasheet, MP3398BGF-Z pinout, MP3398BGF-Z application, or MP3398BGF-Z equivalent, this page provides verified technical context on its peak-current-mode boost architecture, dual-dimming interface, cascading capability, OVP/OTP/LED open-short protection, and TSSOP16-EP package integration - all critical for backlight power design validation.
Technical Context
The MP3398BGF-Z implements fixed-frequency peak-current-mode control with programmable switching frequency (150–621 kHz) set by an external resistor on the OSC pin. Its internal 6V LDO (VCC) powers gate driver and logic, with UVLO at 4.0V (200mV hysteresis) and recoverable thermal shutdown at 150°C (25°C hysteresis).
It integrates four matched current sinks (LED1–LED4) with 800mV max regulation voltage at 330mA, enabling tight current balance (2.5% matching) across strings. Protection includes latch-off overcurrent (640mV ISENSE threshold), 4096-cycle short-string detection, and 8192-cycle inductor/diode short response - all implemented without external components.
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 with up to 4 parallel strings. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across LCD backlight zones without manual calibration. |
| Switching Frequency Range | 150 kHz to 621 kHz - adjustable via ROSC resistor to optimize EMI, efficiency, and inductor size. |
| ISET Reference Voltage | 1.22 V - sets LED current linearly via external resistor (e.g., 30.5kΩ → 32.3mA/string). |
| OVP Threshold | 1.23 V at OVP pin - triggers shutdown when output exceeds programmed level (e.g., 1.15×VOUT). |
| Thermal Shutdown | 150°C with 25°C hysteresis - recovers automatically after die cools, avoiding system latch-up. |
| Dimming Interface | PWM (200Hz–2kHz) and analog (0.4–1.5V DC or >20kHz PWM on ADIM) - supports both legacy and high-fidelity backlight control. |
Pinout & Package
TSSOP16-EP package with exposed thermal pad (must be connected to GND for thermal performance and electrical stability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Loop compensation node | Connects ceramic capacitor to GND to stabilize feedback loop; critical for transient response and stability. |
| 2 EN | Enable control input | Logic-high (>1.8V) enables IC; <0.6V disables - used for system-level power sequencing and fault recovery. |
| 3 PWM | PWM dimming signal input | Directly chops LED current; duty cycle determines average brightness (ILED = Iset × Ddim). |
| 4 GND | Power and signal ground | Common reference for all analog and digital circuitry; connects to exposed pad for thermal conduction. |
| 5 OSC | Frequency setting input | 1.23V-regulated node; ROSC resistor value directly programs switching frequency (e.g., 374kΩ → 180kHz). |
| 6 ISET | LED current programming node | 1.22V reference; current through external resistor sets per-string LED current (e.g., 8.2kΩ → 120mA). |
| 7 ADIM | Analog dimming input | Accepts 0.4–1.5V DC or >20kHz PWM; internal RC filter converts to analog control voltage for linear current scaling. |
| 8–11 LED4–LED1 | LED string cathode switches | Open-drain outputs; sink current from LED string cathodes - enable independent per-string dimming and open-string detection. |
| 12 OVP | Over-voltage protection sense | Voltage divider from output bus sets OVP threshold; 1.23V trigger disables switcher to prevent overvoltage damage. |
| 13 ISENSE | Inductor current sense | Senses RSENSE voltage for cycle-by-cycle current limiting and peak-current mode control; tied to GND if unused. |
| 14 GATE | External MOSFET gate driver output | Drives N-channel MOSFET gate; 4.5Ω source / 2.5Ω sink impedance supports fast switching with low gate charge FETs. |
| 15 VIN | Main power input | Supplies IC bias and boost converter; requires local 4.7µF X5R + 220µF electrolytic bypassing. |
| 16 VCC | Internal 6V LDO output | Powers gate driver and internal logic; regulated from VIN; UVLO protects against brownout operation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel current-matched LED sink | ±2.5% matching accuracy ensures uniform backlight luminance without per-string trimming resistors. |
| Dual dimming interface (PWM + analog) | Independent PWM (pin 3) and analog (pin 7) inputs allow hybrid dimming schemes and backward compatibility. |
| Cascadable architecture | Multiple MP3398BGF-Z ICs share one boost inductor and diode - reduces BOM cost and board space in multi-zone backlights. |
| Comprehensive fault protection | Integrated OCP (latch-off), OTP (recoverable), UVP, OVP, LED open/short, and inductor/diode short detection - eliminates need for external supervisors. |
| Low-dropout LED current regulation | 800mV max VLEDX at 330mA minimizes power loss in current sinks - improves thermal margin and efficiency. |
| Programmable OVP with resistor divider | OVP threshold set via external divider (e.g., 1.15×VOUT) - prevents overvoltage during open-string failure without firmware intervention. |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
|
Use Scenario: 24-inch to 32-inch IPS monitor backlight with 4-zone dimming for contrast enhancement. IC Role / Device Role / Timing Role: Step-up controller regulating 4 parallel WLED strings; manages analog dimming for smooth brightness transitions and PWM for flicker-free video content. Use Value: 2.5% current matching eliminates visible luminance banding; cascading support allows scalable multi-IC designs without redesigning power stage. |
Use Scenario: Commercial signage display with ambient light adaptive brightness using analog dimming input. IC Role / Device Role / Timing Role: Primary LED driver providing stable current to 4 high-lumen strings; ADIM pin accepts 0–1.5V DC from light sensor amplifier for real-time dimming. Use Value: Low 800mV LEDX dropout enables higher efficiency at low dimming levels; integrated OVP prevents catastrophic failure during LED string aging. |
| 2D/3D LCD TVs | Industrial Control Panel Backlights |
|
Use Scenario: 43-inch TV with local dimming zones requiring synchronized PWM dimming across multiple MP3398BGF-Z ICs. IC Role / Device Role / Timing Role: Cascaded WLED controller sharing single boost inductor; PWM pins driven synchronously from SoC to eliminate beat frequencies. Use Value: Cascading capability reduces component count and EMI sources; 4096-cycle short-string detection prevents false triggering during transient load changes. |
Use Scenario: Medical diagnostic display requiring fail-safe operation and thermal resilience in enclosed enclosures. IC Role / Device Role / Timing Role: Fault-tolerant backlight driver with recoverable thermal shutdown and latch-off OCP - maintains partial illumination during overtemperature events. Use Value: 150°C thermal shutdown with 25°C hysteresis ensures safe cooldown before restart; LED open protection keeps at least one string lit during partial failure. |
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 |
|---|---|---|---|
| MP3398AGF-Z | Legacy revision with identical pinout and specs; lacks minor internal timing refinements in MP3398B (Rev. 1.0). | No functional difference in backlight systems; same PCB layout and BOM. | Select MP3398BGF-Z for new designs to ensure latest silicon errata fixes and long-term availability. |
| LM3409QMY/NOPB | Single-string buck-boost LED driver; no integrated current matching or multi-string control logic. | Requires external current mirrors or separate drivers per string - increases complexity and cost for 4-string systems. | Only suitable if redesigning for lower channel count or different topology; not drop-in compatible. |
Compared with MP3398AGF-Z, the MP3398BGF-Z offers updated internal timing and improved noise immunity; versus LM3409QMY/NOPB, it delivers integrated 4-string control, current matching, and cascading - eliminating discrete current-setting components and reducing total solution size by >35%.
Availability
MP3398BGF-Z is available at Aetrix Electronics and suitable for desktop LCD flat panels, 2D/3D TVs, and industrial control panel backlighting requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.
Supply support for MP3398BGF-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 focus on efficiency, integration, and reliability in power management solutions.
The MP3398B product line targets large-format LCD backlighting applications, delivering high-current, multi-string LED control with minimal external components and robust fault handling for commercial and industrial displays.
FAQ
What is the maximum allowable LED string voltage when using MP3398BGF-Z?
The absolute maximum voltage at any LEDx pin is +55V, but practical operation is limited by the OVP threshold and external MOSFET rating. With typical 1.23V OVP reference and 10:1 resistor divider, maximum safe output is ~12.3V; for higher voltages, adjust divider ratio to maintain 1.23V at OVP pin under fault conditions.
Can MP3398BGF-Z drive more than 4 LED strings?
Yes - up to 8 or more strings using cascaded configurations. Two or more MP3398BGF-Z ICs can share a single boost inductor and Schottky diode, with each IC controlling 4 strings independently. Synchronization is achieved via shared OSC and PWM signals, maintaining phase alignment and minimizing input ripple.
How does the MP3398BGF-Z handle an open LED string during operation?
When an LED string opens, its corresponding LEDx pin voltage drops below 196mV. The IC detects this, marks the string as faulty after OVP threshold violation (>4µs), and continues regulating remaining strings. Output voltage is adjusted to the highest forward voltage among active strings, ensuring uninterrupted backlight operation with reduced brightness.
What is the minimum recommended ISET resistor value and why?
The minimum recommended ISET resistor is 3.65kΩ, setting LED current to ~333mA (using ILED = 1.22V / RISET). Lower values risk exceeding the 350mA per-string limit and may cause thermal stress on internal current sinks; datasheet specifies 350mA as absolute maximum continuous current per channel.
Is the ADIM pin compatible with microcontroller GPIO outputs?
Yes - ADIM accepts 0.4–1.5V DC from MCU DAC or filtered PWM. For PWM input, frequency must exceed 20kHz to leverage internal 10MΩ/100pF RC filter; for DC, ensure output impedance <1kΩ to avoid voltage droop. Do not leave ADIM floating - weak internal pull-down defaults to 0% brightness.
Does MP3398BGF-Z support spread-spectrum frequency modulation?
No - the MP3398BGF-Z uses fixed-frequency peak-current-mode control with resistor-programmed oscillator. Spread-spectrum is not implemented; EMI reduction relies on optimized PCB layout, proper input/output capacitor selection, and controlled MOSFET switching via GATE drive strength.
What thermal derating applies above 25°C ambient?
With θJA = 45°C/W, junction temperature rise is ΔT = PD × 45. At 2.78W max dissipation (TA = 25°C), TJ reaches 150°C. Above 25°C, allowable power drops linearly: PD(MAX) = (150 − TA) / 45. At 70°C ambient, max continuous power is 1.78W.
MP3398BGF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 16-TSSOP-EP
MP3398BGF-Z FAQ
1.How can I place an order for MP3398BGF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3398BGF-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 MP3398BGF-Z reliable?
The price and inventory of MP3398BGF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3398BGF-Z is usually 5 days.
3.What payment methods are accepted for MP3398BGF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3398BGF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3398BGF-Z?
MP3398BGF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3398BGF-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 MP3398BGF-Z?
For technical support, including MP3398BGF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3398BGF-Z requirements.
6.How does Aetrix verify that MP3398BGF-Z is sourced from the original manufacturer or authorized distributors?
All MP3398BGF-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 MP3398BGF-Z meets industry standards.
7.What is the process for return or replacement of MP3398BGF-Z?
All MP3398BGF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3398BGF-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 MP3398BGF-Z part is unused and in its original packaging.
Return procedure for MP3398BGF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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