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Monolithic Power Systems Inc. MP3397ES-LF
- Part No.:
- MP3397ES-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP3397ES-LF.pdf
- Description:
- IC LED DRV CTRL PWM 350MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
MP3397ES-LF from Monolithic Power Systems is a 4-string, step-up white LED driver IC designed for large-size LCD panel backlighting. It delivers up to 350mA per string with 2.5% current matching accuracy, operates from 5V–28V input, and uses external MOSFET control via GATE pin to boost output up to 28V. It supports both external PWM and DC-input burst PWM dimming for precise brightness control in flat-panel displays.
For engineers reviewing the MP3397ES-LF datasheet, MP3397ES-LF pinout, MP3397ES-LF application, or MP3397ES-LF equivalent, key selection criteria include programmable switching frequency (150–500 kHz), open/short LED protection, cascading capability for 8+ strings, thermal shutdown, and OVP threshold programmability via resistor divider on OVP pin.
Technical Context
The MP3397ES-LF implements a peak-current-mode, fixed-frequency boost controller with four independent, matched current sinks for LED string regulation. Its internal 6V LDO (VCC) powers gate drive and logic, while COMP pin enables loop compensation for stable voltage regulation across varying LED forward voltages.
Dimming is implemented via dual modes: external PWM applied to DBRT with BOSC grounded through resistor, or DC analog voltage (0.2–1.2V) on DBRT with BOSC capacitor setting internal DPWM frequency (1–2 kHz typical). Protection includes per-string short detection (>6.3V on LEDx), open-string flagging (<196mV), and ISENSE-based cycle-by-cycle current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports wide-range industrial and display power rails without pre-regulation |
| Max LED Current per String | 350mA at 10% DPWM - enables high-brightness backlighting with controlled thermal headroom |
| Current Matching Accuracy | ±2.5% between strings - ensures uniform luminance across multi-string LCD panels |
| Switching Frequency Range | 150kHz to 500kHz - adjustable via OSC pin resistor to optimize EMI, efficiency, and inductor size |
| LED Regulation Voltage | 390mV at 180mA - low VLEDX drop minimizes conduction loss and improves system efficiency |
| OVP Threshold | Programmable via resistor divider to 1.23V reference - allows precise overvoltage cutoff for open-string fault protection |
| Dimming Control Modes | External PWM (100Hz–20kHz) or DC-input burst PWM (1–2kHz) - provides flexible interface options for MCU or analog dimming sources |
| Thermal Shutdown | 150°C junction temperature - protects device during sustained overload or poor heatsinking conditions |
Pinout & Package
MP3397ES-LF is housed in a 16-pin SOIC package with standard 1.27mm pitch and exposed pad not present. Thermal resistance θJA = 80°C/W (4-layer PCB), suitable for moderate-power backlight applications without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Loop Compensation Node | Connects ceramic capacitor to GND to stabilize feedback control loop; critical for transient response and stability |
| 2 EN | Enable Input | Logic-level control (1.8V turn-on, 0.6V turn-off); must not float - enables/disables entire IC operation |
| 3 DBRT | Brightness Control Input | Accepts external PWM signal or 0.2–1.2V DC for linear dimming duty control; positive polarity |
| 4 GND | Signal Ground Reference | Common return for analog and digital circuitry; separate from PGND in layout-critical designs |
| 5 OSC | Frequency Set Input | Resistor-to-GND sets switching frequency (150–500 kHz); internal 1.23V reference enables precise calculation |
| 6 ISET | LED Current Programming | Resistor-to-GND sets per-string current (e.g., 30kΩ → ~32mA); regulated 1.23V reference ensures accuracy |
| 7 BOSC | Burst Oscillator Timing | Capacitor-to-GND sets internal DPWM frequency; resistor-to-GND enables external PWM mode |
| 8–11 LED4–LED1 | LED String Cathode Outputs | Open-drain current sinks - connect LED string cathodes directly; enable per-string dimming and fault detection |
| 12 OVP | Over-Voltage Protection Input | Resistor divider from boost output sets OVP trip point at 1.23V; triggers shutdown on open-string condition |
| 13 ISENSE | Inductor Current Sense | Senses RSENSE voltage for peak-current-mode control and cycle-by-cycle limiting; tie to GND if unused |
| 14 GATE | N-MOSFET Gate Driver Output | Drives external power MOSFET; 4Ω source / 2Ω sink impedance supports fast switching with low gate charge devices |
| 15 VIN | Main Power Input | Supplies IC bias and boost converter input (5–28V); requires local ceramic bypassing for noise suppression |
| 16 VCC | Internal 6V Regulator Output | Provides gate drive and internal logic supply; drops to 0V during shutdown; bypass with ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel current-matched LED driving | 2.5% inter-string current matching enables uniform backlight luminance without optical compensation |
| Programmable boost switching frequency | 150–500 kHz range allows optimization of magnetic component size, efficiency, and conducted EMI filtering |
| Dual PWM dimming architecture | Supports both MCU-generated external PWM and analog-voltage-controlled burst dimming - simplifies system integration |
| Per-string open/short LED fault detection | Independent monitoring of LED1–LED4 pins detects open (<196mV) or short (>6.3V) faults and disables affected strings |
| Cascading capability for expanded channels | Multiple MP3397ES-LF ICs can share one boost stage and COMP node to drive >4 strings with synchronized dimming |
| Low 390mV LED regulation voltage | Reduces conduction loss in current sinks, improving overall efficiency especially at high LED forward voltages |
Applications
| Desktop LCD Flat Panel Displays | Flat Panel Video Displays |
|---|---|
|
Use Scenario: Backlighting for 24–32 inch desktop monitors with 4-string WLED arrays and local dimming zones. IC Role / Device Role / Timing Role: Step-up controller and per-string current regulator; manages boost voltage and synchronizes PWM dimming across all strings. Use Value: Enables uniform brightness and contrast control while maintaining <2.5% current mismatch across strings under varying thermal loads. |
Use Scenario: Commercial signage and kiosk displays requiring robust, long-life backlighting with fault resilience. IC Role / Device Role / Timing Role: Primary LED driver with integrated open/short protection; handles intermittent LED failures without system shutdown. Use Value: Prevents total backlight failure when one string opens - remaining strings stay lit at regulated current, preserving partial visibility. |
| 2D/3D LCD TVs | Industrial Control Panel Displays |
|
Use Scenario: High-brightness TV backlights using 10+ series LEDs per string, driven from 12V or 24V rail. IC Role / Device Role / Timing Role: Boost controller with programmable frequency and cascading support for 8+ strings in large panels. Use Value: Allows scalable design: two MP3397ES-LF ICs share one inductor and diode to drive 8 strings with matched dimming timing. |
Use Scenario: Harsh-environment HMIs with extended temperature operation (-40°C to +125°C junction). IC Role / Device Role / Timing Role: Reliable LED driver with thermal shutdown, UVLO, and robust protection against voltage transients. Use Value: Ensures continuous backlight operation across industrial temperature ranges with automatic recovery after overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3397-AEC1 | Automotive-grade variant with AEC-Q100 qualification, wider temp range (-40°C to +125°C), same pinout and functionality | Required for automotive infotainment and instrument cluster backlighting; not needed for commercial displays | Select MPQ3397-AEC1 only when automotive qualification and enhanced ESD/EMI immunity are mandatory |
| LM3409HV | Single-string buck-boost LED driver with 1A max output; no integrated current matching or multi-string control | Lacks native 4-string support and inter-string matching - requires external current mirrors or multiple ICs | Choose LM3409HV only for single-string or custom multi-IC architectures where flexibility outweighs integration cost |
Compared with MP3397ES-LF, MPQ3397-AEC1 adds automotive reliability without functional trade-offs, while LM3409HV offers higher per-string current but requires external circuitry to match MP3397ES-LF's integrated 4-string precision and protection.
Availability
MP3397ES-LF is available at Aetrix Electronics and suitable for desktop LCD flat panel displays, 2D/3D LCD TVs, and industrial control panel displays requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3397ES-LF 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 MP3397 belongs to MPS's WLED backlight driver product line, engineered specifically for large-format LCD panel illumination with emphasis on current matching, fault resilience, and flexible dimming control.
FAQ
What is the maximum number of LED strings supported by MP3397ES-LF?
The MP3397ES-LF natively drives up to 4 independent LED strings. It supports cascading with additional MP3397ES-LF ICs - two devices sharing one boost stage can drive 8 strings with synchronized dimming and matched current regulation, as confirmed in the datasheet's "Expanding LED Channels" section.
Can MP3397ES-LF operate without an external MOSFET?
No. MP3397ES-LF is a controller-only IC and requires an external N-channel MOSFET connected to the GATE pin. The datasheet specifies gate drive capability (4Ω source / 2Ω sink) and references external FET selection criteria including VDS(MAX), RDS(ON), and QG - confirming it does not integrate a power switch.
How is LED current accuracy maintained across temperature and process variation?
MP3397ES-LF achieves ±2.5% current matching between strings using four matched internal current sources with a regulated 1.23V reference at ISET. Electrical characteristics tables confirm this matching holds across -40°C to +125°C operating junction temperature, verified under 32mA load conditions.
What protection features are integrated into MP3397ES-LF?
Integrated protections include open-string detection (via LEDx pin voltage <196mV), short-string detection (>6.3V on LEDx), overvoltage protection (programmable via OVP pin), under-voltage lockout (3.8–4.6V threshold), and thermal shutdown at 150°C. All are hardware-based and require no external components.
Is MP3397ES-LF compatible with both 12V and 24V input systems?
Yes. The datasheet specifies a 5V to 28V input voltage range, and typical performance graphs include operation at VIN = 12V and VIN = 24V. Efficiency curves show >90% efficiency across this full range at 220mA/string, confirming robust operation in both common display supply rails.
Does MP3397ES-LF support analog (DC) dimming?
It supports DC-input PWM dimming - applying 0.2V–1.2V to DBRT pin linearly controls internal burst PWM duty cycle from 0% to 100%. This is not true analog current control, but a digitally generated PWM with analog-set duty, preserving LED color consistency and avoiding low-frequency flicker.
What is the minimum recommended output capacitance for stable operation?
The datasheet recommends a 4.7μF ceramic capacitor in parallel with a 22μF electrolytic capacitor at the output. This combination ensures low impedance at the switching frequency and maintains feedback loop stability, as validated in the "Selecting the Output Capacitor" application note section.
MP3397ES-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP3397ES-LF FAQ
1.How can I place an order for MP3397ES-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3397ES-LF 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 MP3397ES-LF reliable?
The price and inventory of MP3397ES-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3397ES-LF is usually 5 days.
3.What payment methods are accepted for MP3397ES-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3397ES-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3397ES-LF?
MP3397ES-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3397ES-LF 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 MP3397ES-LF?
For technical support, including MP3397ES-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3397ES-LF requirements.
6.How does Aetrix verify that MP3397ES-LF is sourced from the original manufacturer or authorized distributors?
All MP3397ES-LF 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 MP3397ES-LF meets industry standards.
7.What is the process for return or replacement of MP3397ES-LF?
All MP3397ES-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP3397ES-LF, 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 MP3397ES-LF part is unused and in its original packaging.
Return procedure for MP3397ES-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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