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Monolithic Power Systems Inc. MP3305DD-LF-Z
- Part No.:
- MP3305DD-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP3305DD-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.33A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MP3305DD-LF-Z from Monolithic Power Systems is a 36V, 1.3A step-up white LED driver IC with true PWM dimming up to 50kHz, 2.2MHz fixed switching frequency, 200mV feedback reference, and adjustable open-load OVP protection. It drives up to 10-series WLED strings from 3–6V input (e.g., single Li-ion or 5V rail) in LCD backlighting applications.
For engineers reviewing the MP3305DD-LF-Z datasheet, MP3305DD-LF-Z pinout, MP3305DD-LF-Z application, or MP3305DD-LF-Z equivalent, key selection criteria include its high-frequency PWM dimming noise suppression, low-loss current-sense architecture, thermal shutdown at 150°C, and QFN8 (2×3mm) package suitability for space-constrained portable displays.
Technical Context
The MP3305DD-LF-Z implements a constant-frequency peak-current-mode boost converter with internal 1.3A MOSFET switch and dedicated LED current regulation via ISET pin voltage control at 200mV. Its 2.2MHz switching frequency enables compact magnetics and reduces EMI compared to sub-1MHz alternatives.
OVP threshold is externally adjustable via resistor divider on OVP pin with 0.9V internal reference; EN pin serves dual function as enable input and PWM dimming command interface (250Hz–50kHz). UVLO triggers at 2.45V rising edge with 92mV hysteresis, ensuring stable startup across battery discharge profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 6V - Supports single-cell Li-ion (2.7–4.2V) and regulated 5V rails without external LDO. |
| Output Voltage Capability | Up to 36V - Enables driving ≥10-series white LEDs (3.2V × 10 = 32V typical forward drop). |
| Switching Frequency | 2.2MHz (typ) - Allows use of ≤2.2µH inductors and minimizes audible noise and filter size. |
| Feedback Reference Voltage | 200mV (typ) - Reduces I²R loss in current-sense resistor, improving efficiency at high LED currents. |
| PWM Dimming Range | 250Hz to 50kHz - Eliminates audible coil whine while enabling precise luminance control in varying ambient light. |
| OVP Threshold | Adjustable via external divider; internal 0.9V reference - Enables safe shutdown during LED string open-circuit failure. |
| Thermal Shutdown | 150°C - Protects die under sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MP3305DD-LF-Z uses an 8-pin QFN package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to GND for optimal power dissipation (θJA = 65°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch output | Drain of internal 1.3A MOSFET; connects to inductor and rectifier; swings from GND to 36V. |
| 2,8 GND / Exposed Pad | Ground reference & thermal path | Must be soldered to solid GND plane; primary thermal conduction path for 1.9W max power dissipation. |
| 3 IN | Main input supply | Accepts 3–6V; requires local 10µF ceramic bypass capacitor to suppress high-frequency ripple. |
| 4 OVP | Open-load protection adjust | Voltage divider input; triggers shutdown when node reaches 0.9V - sets OVP threshold per application needs. |
| 5 EN | Enable & PWM dimming input | Logic-level control: <0.4V = off, >1.8V = on; 250Hz–50kHz square wave = true PWM dimming. |
| 6 LED | LED cathode connection | Open-drain output of internal dimming switch; sinks LED string current to ground through external path. |
| 7 ISET | LED current set reference | Sources current into external sense resistor; regulates voltage across RSET to 200mV → ILED = 0.2V/RSET. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.3A power MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity for boost LED drivers. |
| True PWM dimming up to 50kHz | Prevents audible noise in thin-film LCD backlights and enables flicker-free imaging in digital cameras. |
| Adjustable OVP with 0.9V reference | Allows system-level fault tolerance tuning - e.g., set OVP at 34V for 10×3.2V LEDs + margin, avoiding false trips. |
| 200mV current-sense reference | Lowers power loss in RSET by 60% vs. standard 1V references, critical for thermally constrained handheld designs. |
| Internal soft-start & thermal shutdown | Prevents inrush current damage at startup and protects against sustained overloads without external circuitry. |
Applications
| LCD Panel Backlighting | Digital Picture Frame Display |
|---|---|
|
Use Scenario: Driving 10 parallel strings of 3-series white LEDs from 5V USB power in 7-inch TFT LCD panels. IC Role / Device Role / Timing Role: Constant-current boost controller regulating total string current at 200mA with synchronized PWM dimming. Use Value: 88% peak efficiency at 5V input enables passive cooling; 50kHz dimming eliminates visible flicker and audio artifacts. |
Use Scenario: Powering 9-series WLED strings (3 parallel × 9 series) from 3.3–18V variable input in wall-mounted digital photo frames. IC Role / Device Role / Timing Role: Wide-input boost driver with bias-assisted startup and adjustable OVP for field-replaceable LED modules. Use Value: Adjustable OVP prevents overvoltage stress during LED aging; 2.2MHz operation allows miniaturized 10µH inductor footprint. |
| Handheld Computer/PDA Display | Digital Still Camera Flash/Backlight |
|
Use Scenario: Single-cell Li-ion (2.7–4.2V) powered 4.3-inch WVGA display requiring smooth brightness control across ambient light conditions. IC Role / Device Role / Timing Role: Low-quiescent-current (690µA typ) LED driver with UVLO hysteresis to extend battery runtime and prevent brown-out resets. Use Value: 250Hz–50kHz dimming range supports both manual UI brightness sliders and automatic ambient-light-adaptive algorithms. |
Use Scenario: Dual-mode operation - steady backlight for preview and pulsed flash for capture in compact digital cameras. IC Role / Device Role / Timing Role: Fast-response current regulator supporting <5µs minimum EN pulse width for precise flash timing control. Use Value: Internal 1.3A current limit ensures safe LED pulsing without external current limiting; thermal shutdown prevents lens heating damage. |
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 |
|---|---|---|---|
| AL8862SP-13 | 40V output, 1.2A switch, 500kHz max switching frequency, no adjustable OVP - fixed 32V OVP. | Lacks programmable OVP; lower switching frequency requires larger inductor; suitable only for fixed-string-count designs. | Choose if OVP adjustment is unnecessary and board area permits larger magnetics. |
| LT3466EDD-1#TRPBF | 40V output, 1.3A switch, 1.2MHz switching, 100mV feedback reference, no integrated PWM dimming control on EN. | Requires external PWM generator; lower VFB improves efficiency but lacks native EN-based dimming interface. | Choose when ultra-low sense loss is critical and external dimming logic is already present. |
Compared with AL8862SP-13 and LT3466EDD-1#TRPBF, MP3305DD-LF-Z uniquely integrates adjustable OVP, native EN-pin PWM dimming (250Hz–50kHz), and 2.2MHz operation - delivering superior noise performance, layout simplicity, and system-level fault configurability in portable displays.
Availability
MP3305DD-LF-Z is available at Aetrix Electronics and suitable for LCD panel backlighting, digital picture frame displays, and handheld computer/PDA display systems requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP3305DD-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, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP3305 belongs to MPS's white LED backlight driver product line, engineered specifically for space-constrained, battery-powered portable displays demanding high efficiency, low noise, and robust fault protection.
FAQ
What input voltage range does MP3305DD-LF-Z support?
The MP3305DD-LF-Z operates from 3V to 6V on its IN pin, making it compatible with single-cell lithium-ion batteries (2.7–4.2V nominal) and regulated 5V supplies. Input below 2.45V triggers UVLO shutdown, and hysteresis prevents oscillation near the threshold.
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 reference voltage is specified as 185–215mV (±7.5%) at 25°C, so RSET tolerance and temperature drift directly impact current accuracy.
Can MP3305DD-LF-Z drive more than 10-series white LEDs?
No - the absolute maximum output voltage is 36V, and typical white LED forward voltage is ≥3.2V per device. Driving 11-series would require ≥35.2V, leaving insufficient headroom for regulation margin and diode drop, risking OVP trip or regulation loss.
What thermal derating applies above 25°C ambient?
With θJA = 65°C/W, junction temperature rise is ΔTJ = PD × 65. At 85°C ambient, maximum allowable power dissipation drops to (125°C − 85°C)/65 ≈ 0.615W - requiring reduced load current or enhanced PCB copper area to maintain reliability.
Is the EN pin compatible with 1.8V logic microcontrollers?
Yes - the EN pin has a guaranteed turn-on threshold of ≥1.8V and turn-off threshold of ≤0.4V, with 5ms disable timer. A 1.8V GPIO can reliably enable the part; for PWM dimming, ensure signal amplitude exceeds 2V peak-to-peak to avoid partial switching.
Does MP3305DD-LF-Z require an external Schottky diode?
Yes - the internal switch is a high-side N-MOSFET (SW pin), so an external Schottky diode (e.g., B0540) is required in the boost path to provide the freewheeling current path. Diode reverse voltage rating must exceed 36V, and average current rating ≥200mA per string.
How is open-load OVP adjusted and what is its minimum threshold?
OVP is set using a resistor divider from LED+ to OVP pin, referenced to the internal 0.9V comparator. With R2 = 0Ω (divider bottom shorted), minimum OVP = 0.9V; practical thresholds start at ~12V using standard resistor ratios, scalable up to 36V.
MP3305DD-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):
- 2.5V
- 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)
MP3305DD-LF-Z FAQ
1.How can I place an order for MP3305DD-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3305DD-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 MP3305DD-LF-Z reliable?
The price and inventory of MP3305DD-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 MP3305DD-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3305DD-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3305DD-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3305DD-LF-Z?
MP3305DD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3305DD-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 MP3305DD-LF-Z?
For technical support, including MP3305DD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3305DD-LF-Z requirements.
6.How does Aetrix verify that MP3305DD-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3305DD-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 MP3305DD-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3305DD-LF-Z?
All MP3305DD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3305DD-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 MP3305DD-LF-Z part is unused and in its original packaging.
Return procedure for MP3305DD-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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