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Monolithic Power Systems Inc. MP3304ADD-LF-Z
- Part No.:
- MP3304ADD-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP3304ADD-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.33A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
MP3304ADD-LF-Z from Monolithic Power Systems is a 36V, 1.3A step-up white LED driver with true PWM dimming up to 50kHz, fixed 2.2MHz switching frequency, and 200mV feedback reference voltage. It integrates a 0.4Ω internal MOSFET switch and regulates LED current via external sense resistor, targeting backlighting for small LCD panels powered from 3–6V inputs.
For engineers reviewing the MP3304ADD-LF-Z datasheet, MP3304ADD-LF-Z pinout, MP3304ADD-LF-Z application, or MP3304ADD-LF-Z equivalent, key selection criteria include OVP threshold (38V), thermal shutdown (150°C), open-load protection, and compatibility with 2×3mm QFN8 layout constraints in space-constrained portable displays.
Technical Context
The MP3304ADD-LF-Z employs constant-frequency peak-current-mode boost architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier compares 200mV ISET reference against sensed current, driving a PWM comparator that controls the 1.3A/0.4Ω integrated power switch.
EN pin serves dual function: logic-level ON/OFF control with 5ms disable timer and direct 250Hz–50kHz square-wave PWM dimming input. The LED pin provides open-drain dimming switch output, while SW pin swings up to +36V relative to PGND during operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 6V - Supports single-cell Li-ion (3.0–4.2V) and regulated 5V rails without external LDO. |
| Output Over-Voltage Protection | 38V - Shuts down SW when LED string open-circuits, preventing capacitor overvoltage in 10-string WLED arrays. |
| Switching Frequency | 2.2MHz (typ) - Enables use of compact 2.2µH inductors and reduces EMI filtering burden in handheld designs. |
| Feedback Reference Voltage | 200mV - Minimizes ISET resistor power loss and improves efficiency at high LED currents (e.g., 200mA → 40mW dissipation). |
| PWM Dimming Range | 250Hz to 50kHz - Eliminates audible noise at ≥20kHz while retaining low-frequency compatibility for legacy systems. |
| Thermal Shutdown Threshold | 150°C - Protects die during sustained overload or poor PCB thermal design; auto-recovery requires power recycle. |
| Current Limit | 1.33A (typ) - Limits peak inductor current to prevent saturation and ensures safe operation with 2.2µH/500mA-rated inductors. |
Pinout & Package
MP3304ADD-LF-Z is housed in an 8-pin QFN package measuring 2mm × 3mm with exposed thermal pad connected to GND. Pin 1 (SW) is located at top-left per JEDEC MO-229 VCED-2 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch drain node | Connects to inductor and Schottky diode anode; swings from GND to +36V; carries high di/dt ripple current. |
| 2 PGND | Power ground return | Separate low-impedance path for switch current; must be tied directly to exposed pad and local output capacitor ground. |
| 3 IN | Main input supply | Accepts 3–6V; requires local 10µF ceramic bypass; RC filter recommended to suppress high-frequency noise. |
| 4 N/C | No connect | Not internally bonded; must remain unconnected and un-biased on PCB. |
| 5 EN | Enable & PWM dimming input | Logic-high (>1.8V) enables operation; 250Hz–50kHz square wave applied here controls LED brightness without analog current variation. |
| 6 LED | Open-drain dimming switch output | Connects to LED cathodes; sinks current during PWM off-time to fully extinguish LEDs and avoid leakage glow. |
| 7 ISET | Current sense reference node | Regulated at 200mV; connects to one end of external RSET; sets LED current as ILED = 0.2V / RSET. |
| 8 GND / Exposed Pad | Signal & thermal ground | Primary thermal path; must be soldered to large copper pour; electrically tied to all other GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.3A/0.4Ω MOSFET | Eliminates external switch and gate driver; reduces BOM count and layout area in ultra-compact backlight modules. |
| True PWM dimming (250Hz–50kHz) | Preserves LED color point across dimming range and avoids low-frequency flicker perception in digital picture frames and PDAs. |
| 200mV ISET reference voltage | Reduces RSET power loss by 60% vs. conventional 1V references, enabling higher efficiency at 200mA LED current. |
| Open-load shutdown (38V OVP) | Prevents destructive overvoltage on output capacitors if one or more LED strings fail open in multi-string configurations. |
| 2.2MHz fixed-frequency operation | Allows use of <3mm footprint inductors and simplifies EMI compliance testing versus variable-frequency alternatives. |
Applications
| LCD Panels | Digital Picture Frames |
|---|---|
|
Use Scenario: Backlighting for 7-inch TFT-LCD panels in industrial HMIs with 3–5V supply rails. IC Role / Device Role / Timing Role: Step-up DC-DC converter regulating constant current to 10 parallel strings of 3-series WLEDs. Use Value: 88% peak efficiency at 5V input enables >4-hour battery runtime in portable HMIs without active cooling. |
Use Scenario: Brightness-adjustable backlight in consumer digital photo frames powered by USB or AA batteries. IC Role / Device Role / Timing Role: High-frequency PWM-controlled LED driver enabling flicker-free dimming from 1% to 100% luminance. Use Value: 50kHz PWM dimming eliminates audible coil whine and preserves image fidelity during long-duration slideshow playback. |
| Handheld Computers | Digital Still Cameras |
|
Use Scenario: Backlight for resistive-touch QVGA displays in ruggedized handheld computers operating from 3.7V Li-ion cells. IC Role / Device Role / Timing Role: UVLO-protected boost controller with thermal shutdown, ensuring reliable startup down to 2.45V cell voltage. Use Value: Under-voltage lockout (2.45V) prevents brown-out reset during deep discharge, extending usable battery capacity. |
Use Scenario: Flash-assist and preview backlight in compact digital cameras with tight board space and thermal constraints. IC Role / Device Role / Timing Role: Compact 2×3mm QFN8 LED driver delivering 200mA total current to 9-series/3-parallel WLED array. Use Value: Exposed thermal pad enables 1.9W power dissipation at +25°C ambient, supporting continuous flash assist without thermal throttling. |
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 |
|---|---|---|---|
| MP3304BDD-LF-Z | OVP threshold reduced to 26V; identical pinout, package, and PWM dimming capability. | Better suited for lower-output-voltage arrays (e.g., ≤6-series WLEDs) where 38V headroom is unnecessary. | Select when system OVP margin can be relaxed to reduce cost and improve noise immunity at lower VOUT. |
| RT9397BZSP | 2.5MHz switching, 30V OVP, no integrated MOSFET (external switch required), 1.2V feedback reference. | Requires external 1.5A MOSFET and gate driver; larger solution size but supports wider input range (2.5–5.5V). | Choose when higher input voltage flexibility or discrete switch optimization is prioritized over integration and footprint. |
Compared with MP3304BDD-LF-Z, the MP3304ADD-LF-Z provides higher OVP margin for robust open-string protection in 10-string arrays; versus RT9397BZSP, it delivers smaller footprint and higher efficiency via integrated switch and low 200mV reference, at the cost of fixed input range.
Availability
MP3304ADD-LF-Z is available at Aetrix Electronics and suitable for LCD panels, digital picture frames, and handheld computers requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability for industrial display programs.
Supply support for MP3304ADD-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP3304 product line targets space-constrained portable backlighting, delivering integrated step-up LED drivers with high-frequency PWM dimming, low-loss regulation, and robust fault protection for consumer and industrial displays.
FAQ
What is the maximum number of white LEDs the MP3304ADD-LF-Z can drive in series?
The MP3304ADD-LF-Z supports up to 10 series-connected white LEDs per string when configured with appropriate inductor and output capacitor values. Its 38V over-voltage protection threshold and 36V output capability enable reliable operation with typical 3.2–3.6V forward-voltage WLEDs, yielding up to ~36V total string voltage at full load.
Does the MP3304ADD-LF-Z require an external Schottky diode?
Yes, an external Schottky diode is required. The MP3304ADD-LF-Z integrates only the high-side power MOSFET switch; the diode completes the boost converter's flyback path. A 500mA-rated Schottky such as B0530 or B0540 is recommended for low forward voltage and fast recovery to maintain efficiency at 2.2MHz switching.
How is LED current accuracy affected by temperature?
LED current accuracy remains within ±5% over –40°C to +85°C ambient, as the 200mV ISET reference exhibits low temperature drift (<100ppm/°C) and the internal current limit maintains consistent peak-switching behavior. External RSET tolerance and PCB thermal gradients dominate overall current variation.
Can the MP3304ADD-LF-Z operate from a 3.3V input source?
Yes, the MP3304ADD-LF-Z operates from 3V minimum input, making it compatible with 3.3V rails and partially discharged Li-ion cells. At 3.3V input, output capability drops due to reduced duty cycle margin; for 10-string WLEDs, ensure VIN ≥ 3.6V to maintain regulation under worst-case forward-voltage spread.
What is the purpose of the N/C pin (Pin 4) on the MP3304ADD-LF-Z?
Pin 4 is a no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected on the PCB-neither routed nor grounded-to avoid parasitic coupling or mechanical stress on the die. Its presence maintains standard QFN8 pinout alignment for manufacturing compatibility.
How does the MP3304ADD-LF-Z handle thermal overload?
When junction temperature exceeds 150°C, the MP3304ADD-LF-Z disables the power switch and holds SW low until power is cycled. Unlike foldback current limiting, this hard shutdown prevents cumulative thermal damage and requires manual or system-level reset-ensuring reliability in sealed enclosures without airflow.
Is the exposed thermal pad electrically isolated?
No, the exposed pad is internally connected to GND and must be soldered to a dedicated PCB ground plane. It serves both electrical grounding and thermal conduction functions; omitting thermal vias or undersizing the copper area degrades θJA from 65°C/W to >100°C/W, risking premature thermal shutdown.
MP3304ADD-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:
- Not For New Designs
- 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:
- 36V
- 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)
MP3304ADD-LF-Z FAQ
1.How can I place an order for MP3304ADD-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3304ADD-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 MP3304ADD-LF-Z reliable?
The price and inventory of MP3304ADD-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 MP3304ADD-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3304ADD-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3304ADD-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3304ADD-LF-Z?
MP3304ADD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3304ADD-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 MP3304ADD-LF-Z?
For technical support, including MP3304ADD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3304ADD-LF-Z requirements.
6.How does Aetrix verify that MP3304ADD-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3304ADD-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 MP3304ADD-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3304ADD-LF-Z?
All MP3304ADD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3304ADD-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 MP3304ADD-LF-Z part is unused and in its original packaging.
Return procedure for MP3304ADD-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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