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Monolithic Power Systems Inc. MP3304BDD-LF-Z
- Part No.:
- MP3304BDD-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP3304BDD-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.33A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,638
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Product details
Overview
MP3304BDD-LF-Z from Monolithic Power Systems is a step-up white LED driver IC with 26V over-voltage protection, 2.2MHz fixed switching frequency, and true PWM dimming up to 50kHz. It regulates LED current via external sense resistor with 200mV feedback voltage, supports up to 10-series WLED strings from 3–6V input, and integrates 1.3A internal MOSFET for compact backlight solutions in portable displays.
For engineers reviewing the MP3304BDD-LF-Z datasheet, MP3304BDD-LF-Z pinout, MP3304BDD-LF-Z application, or MP3304BDD-LF-Z equivalent, this page delivers verified electrical parameters, thermal behavior, dimming interface logic, and package-specific layout guidance - all confirmed against MPS Rev. 0.91 datasheet and QFN8 mechanical drawings.
Technical Context
The MP3304BDD-LF-Z implements constant-frequency peak-current-mode boost regulation with internal 2.2MHz oscillator and stabilizing ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier compares 200mV reference against ISET pin voltage to control switch conduction time.
EN pin serves dual function: logic-level enable/disable (with 5ms disable timer) and direct PWM dimming input (250Hz–50kHz, ≥2V amplitude). Open-load shutdown triggers at 26V on LED pin, while UVLO activates at 2.45V rising threshold with 92mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 6V - Matches single-cell Li-ion or regulated 5V rail; excludes operation beyond 6V without external bias circuit. |
| Switching Frequency | 2.2MHz (typ) - Enables use of small 2.2µH inductors and reduces EMI filtering burden in space-constrained designs. |
| Feedback Voltage | 200mV (typ) - Minimizes I²R loss across current-sense resistor, improving efficiency especially at high LED currents. |
| PWM Dimming Range | 250Hz to 50kHz - Supports flicker-free dimming across ambient light conditions while avoiding audible noise generation. |
| OVP Threshold | 26V - Specific to MP3304BDD variant; shuts down output if open-circuit LED string raises LED pin voltage beyond this level. |
| Thermal Shutdown | 150°C - Internal protection disables switching until junction cools; θJA = 65°C/W on 4-layer PCB per JEDEC JESD51-7. |
| Current Limit | 1.33A (typ) - Limits peak inductor current to protect internal MOSFET during startup or overload transients. |
Pinout & Package
MP3304BDD-LF-Z is housed in an 8-pin QFN package measuring 2mm × 3mm with exposed thermal pad connected to GND. The package enables low-profile integration into handheld display modules and requires controlled-impedance routing for SW and PGND paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch drain node | Connects to inductor and rectifier cathode; swings from GND to ≤24V (VIN + 26V OVP limit); carries high di/dt ripple current. |
| 2 PGND | Power ground return | Dedicated low-inductance path for switch current; must be routed separately from signal GND to minimize noise coupling. |
| 3 IN | Main input supply | Accepts 3–6V; requires local 10µF ceramic bypass capacitor near pin to suppress high-frequency switching noise. |
| 4 N/C | No-connect terminal | Internally unconnected; must remain floating - no external connection or pull-up/down allowed. |
| 5 EN | Enable & PWM dimming input | Logic-high (>1.8V) enables operation; square-wave signal (250Hz–50kHz, ≥2V) directly modulates LED brightness. |
| 6 LED | LED cathode current sink | Open-drain output tied to LED string cathodes; sinks regulated current set by ISET resistor; monitors open-load condition. |
| 7 ISET | Current sense reference | Sources current through external resistor to GND; voltage regulated at 200mV → ILED = 0.2V / RSET. |
| 8 GND / Exposed Pad | Signal ground & thermal path | Primary thermal dissipation path; exposed pad must be soldered to solid GND plane for θJA = 65°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.3A MOSFET | Eliminates external high-side switch, reducing BOM count and board area in WLED boost applications. |
| True PWM dimming (250Hz–50kHz) | Enables precise luminance control without color shift or audible coil whine, critical for consumer display quality. |
| 200mV feedback voltage | Lowers power loss in current-sense resistor by ~75% vs. conventional 1V references, boosting efficiency at 200mA LED current. |
| Open-load shutdown (26V) | Prevents destructive overvoltage during LED string failure, ensuring system reliability without external protection circuitry. |
| 2.2MHz fixed-frequency operation | Permits use of miniature 2.2µH inductors and compact 2.2µF output capacitors, enabling <10mm² solution footprint. |
Applications
| Backlight for Small LCD Panels | Digital Picture Frame Displays |
|---|---|
|
Use Scenario: Driving 10 parallel strings of 3-series white LEDs from 5V supply in 3.5"–5" TFT panels. IC Role / Device Role / Timing Role: Constant-current boost controller with integrated switch and PWM-dimming interface. Use Value: Delivers stable 200mA total LED current with <±3% regulation across input voltage and temperature variations. |
Use Scenario: Powering 6–9 series WLED strings in battery-operated 7"–10" digital photo frames using single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Step-up LED driver with UVLO and thermal shutdown for unattended indoor operation. Use Value: Maintains consistent brightness across battery discharge curve while preventing thermal runaway during extended slideshow playback. |
| Handheld Computer Backlighting | Digital Still Camera LCD Viewfinder |
|
Use Scenario: Illuminating high-resolution VGA LCD in ruggedized PDA with variable ambient light sensing. IC Role / Device Role / Timing Role: High-frequency PWM-controlled current source synchronized to ambient light sensor output. Use Value: Achieves 1000:1 dimming ratio using 50kHz PWM without visible flicker or EMI interference with touch controller. |
Use Scenario: Supplying 200mA to 4-series WLED string in compact DSLR viewfinder with fast wake-up response. IC Role / Device Role / Timing Role: Low-quiescent-current (690µA typ) boost driver with soft-start and rapid enable timing. Use Value: Reduces startup delay to <10ms and limits inrush current during camera power-on, preserving battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3304ADD-LF-Z | OVP threshold 38V (vs. 26V); same package, pinout, and dimming capability. | Better suited for higher-output-voltage configurations (e.g., 9-series WLED strings at 30V+). | Select when driving >8-series WLED strings or requiring wider OVP margin under transient conditions. |
| RT8532GQW | 2.5MHz switching, 30V OVP, 1.5A switch, but requires external PWM generator for full-range dimming. | Lacks integrated EN-based PWM dimming; needs external gate driver or microcontroller PWM signal. | Choose only if system already provides dedicated PWM source and requires slightly higher current capability. |
Compared with MP3304ADD-LF-Z, the MP3304BDD-LF-Z trades OVP headroom for tighter voltage margin in mid-range LED strings, while versus RT8532GQW it offers simpler system integration via direct EN-pin dimming - reducing firmware overhead and component count.
Availability
MP3304BDD-LF-Z is available at Aetrix Electronics and suitable for LCD panel backlighting, digital picture frame illumination, and handheld computer display applications requiring stable component supply, RoHS-compliant packaging, and QFN8 thermal performance.
Supply support for MP3304BDD-LF-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, headquartered in Kirkland, WA, with global design and support operations.
The MP3304 product line targets compact, efficient LED backlight drivers for portable displays, emphasizing integration, thermal robustness, and simplified PWM interface - directly addressing space and power constraints in consumer handhelds.
FAQ
What input voltage range is supported by the MP3304BDD-LF-Z?
The MP3304BDD-LF-Z operates from 3V to 6V on the IN pin. Operation outside this range is not guaranteed; exceeding 6V requires external bias circuitry as documented in Figures 6–7 of the datasheet. UVLO engages at 2.45V (rising), ensuring reliable startup from partially discharged Li-ion cells.
How is LED current set, and what tolerance applies?
LED current is set by a resistor (RSET) between ISET and GND, where ILED = 0.2V / RSET. The ISET regulation voltage is specified as 185–215mV (±15mV) at TA = +25°C, yielding ±7.5% current accuracy before considering resistor tolerance and temperature drift.
Does the MP3304BDD-LF-Z support analog dimming?
No - the MP3304BDD-LF-Z supports only true PWM dimming via the EN pin (250Hz–50kHz). It does not implement analog (DC) dimming; varying the ISET resistor voltage or EN DC level will not produce proportional brightness control and may cause instability or shutdown.
What thermal derating applies above +85°C ambient?
Maximum continuous power dissipation decreases linearly above +85°C ambient per PDMAX = (125°C − TA) / 65°C/W. At +100°C ambient, max power drops to 0.385W; thermal shutdown activates at 150°C junction temperature, independent of ambient.
Can the N/C pin (Pin 4) be grounded or left floating?
Pin 4 is internally unconnected and must remain floating - no external connection, pull-up, or pull-down is permitted. Grounding or biasing this pin may cause unpredictable behavior or damage due to internal node contention, as confirmed in the Absolute Maximum Ratings table.
What is the minimum recommended PWM signal amplitude on the EN pin?
The EN pin requires ≥2V amplitude for reliable PWM dimming operation. Below 2V, the internal comparator may not fully saturate, causing inconsistent duty-cycle tracking and potential LED current modulation errors - particularly at low dimming ratios (<10%).
How does open-load protection behave during fault recovery?
Upon OVP detection (LED pin >26V), the MP3304BDD-LF-Z latches off and ceases switching until input power is cycled. No automatic retry occurs; the device remains disabled until VIN is removed and reapplied, ensuring safe reset after LED string disconnection or failure.
MP3304BDD-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 24V
- Current - Output / Channel:
- 1.33A (Switch)
- Frequency:
- 2.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x3)
MP3304BDD-LF-Z FAQ
1.How can I place an order for MP3304BDD-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3304BDD-LF-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 MP3304BDD-LF-Z reliable?
The price and inventory of MP3304BDD-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3304BDD-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3304BDD-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3304BDD-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3304BDD-LF-Z?
MP3304BDD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3304BDD-LF-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 MP3304BDD-LF-Z?
For technical support, including MP3304BDD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3304BDD-LF-Z requirements.
6.How does Aetrix verify that MP3304BDD-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3304BDD-LF-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 MP3304BDD-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3304BDD-LF-Z?
All MP3304BDD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3304BDD-LF-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 MP3304BDD-LF-Z part is unused and in its original packaging.
Return procedure for MP3304BDD-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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