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Monolithic Power Systems Inc. MP3308DL-LF-P
- Part No.:
- MP3308DL-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP3308DL-LF-P.pdf
- Description:
- IC LED DRV RGLTR PWM 1.33A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
MP3308DL-LF-P from Monolithic Power Systems is a monolithic step-up white LED driver IC with dual PWM dimming input control, designed for backlighting small LCD panels and portable displays. It delivers up to 180mA total output current across 9 parallel LED strings, regulates LED current via a 200mV ISET feedback voltage, operates from 2.5–6V input, and integrates a 1.3A internal N-channel MOSFET switch in a 3mm×4mm QFN14 package.
For engineers reviewing the MP3308DL-LF-P datasheet, MP3308DL-LF-P pinout, MP3308DL-LF-P application, or MP3308DL-LF-P equivalent, key selection criteria include its 2.2MHz fixed-frequency current-mode boost architecture, ±3% true PWM dimming duty accuracy, dual independent PWM inputs (PWMIA/PWMIB), adjustable over-voltage protection threshold, and thermal/short-circuit/UVLO protection features.
Technical Context
The MP3308DL-LF-P implements a constant-frequency peak-current-mode boost regulator with internal 1.3A power MOSFET and integrated current-sense amplifier. Its 200mV ISET reference minimizes power loss across the external current-setting resistor, while the 2.2MHz switching frequency enables compact external components including 3.3µH inductors and ceramic capacitors.
Dual PWM dimming is implemented via separate PWMIA and PWMIB inputs, each filtered internally to generate DC control voltages at PWMOA and PWMOB pins. The OVP threshold is programmable via an external resistor divider on the OVP pin, with shutdown triggered when the pin reaches 0.9V - enabling precise open-load and overvoltage fault response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (3.0–4.2V) and 3.3V system rails without external LDO. |
| Switching Frequency | 2.2MHz (typ.) - enables use of sub-5µH inductors and low-ESR ceramic output capacitors for space-constrained designs. |
| ISET Feedback Voltage | 200mV (±15mV) - reduces power dissipation in current-sense resistor by >75% vs. conventional 1V references. |
| PWM Dimming Accuracy | ±3% duty cycle error - ensures consistent luminance scaling across brightness levels and prevents visible flicker or banding. |
| Over-Voltage Protection | Adjustable threshold (0.9V reference at OVP pin) - allows setting OVP from ~9V to >30V using external resistor divider for varied LED string configurations. |
| Thermal Shutdown | 150°C junction temperature - protects device during sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| Efficiency | Up to 88% at 5V input, 9V/180mA output - achieved via low RON (0.4Ω) internal switch and minimal 200mV feedback overhead. |
Pinout & Package
MP3308DL-LF-P is housed in a thermally enhanced 3mm×4mm, 14-pin QFN package with exposed thermal pad (Pin 2) that must be soldered to PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power switch drain node | Connects to inductor and flyback diode; swings from GND to up to 40V; carries peak inductor current. |
| PGND (Pin 2) | Power ground / thermal pad | Exposed pad must be connected to solid GND copper area; primary thermal path and high-current return for SW node. |
| IN (Pin 3) | Main supply input | Input rail connection; requires local 4.7µF ceramic bypass capacitor near pin to suppress high-frequency noise. |
| PWMIA (Pin 4) | Primary PWM dimming input | Accepts 2V–5V square wave; internally filtered to generate analog dimming voltage at PWMOA pin. |
| PWMIB (Pin 5) | Secondary PWM dimming input | Independent dimming channel; combined with PWMIA to produce multiplicative dimming effect (DA × DB). |
| EN (Pin 6) | Enable control | Logic-high (>1.8V) enables operation; logic-low (<0.4V) places device in 30µA shutdown mode. |
| FSET (Pin 7) | PWM dimming frequency set | Capacitor-to-GND sets dimming frequency per fPWM = 16176 / CFSET(nF); range: 50Hz–50kHz. |
| PWMOB (Pin 8) | Filtered PWM B output | Internal RC-filtered version of PWMIB; connects to external capacitor for stable DC dimming voltage. |
| PWMOA (Pin 9) | Filtered PWM A output | Internal RC-filtered version of PWMIA; used with PWMOB to drive analog dimming control circuitry. |
| GND (Pins 10, 14) | Analog ground reference | Low-noise ground return for ISET, OVP, FSET, and PWM filter circuits; separate from PGND but tied on PCB. |
| OVP (Pin 11) | Over-voltage sense input | Monitors LED string voltage via resistor divider; triggers shutdown when voltage exceeds programmed threshold (0.9V reference). |
| LED (Pin 12) | LED cathode connection | Open-drain output of internal dimming switch; connects directly to cathode of LED string(s) for current sink operation. |
| ISET (Pin 13) | LED current programming | Sinks regulated 200mV across external resistor to set LED current (ILED = 200mV / RISET). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM dimming inputs | Enables multiplicative brightness control (DA × DB) for ultra-fine luminance resolution without microcontroller intervention. |
| 200mV ISET reference voltage | Reduces power loss in current-sense resistor by >75% versus 1V references, critical for battery-powered devices with tight thermal budgets. |
| Programmable over-voltage protection | Allows OVP threshold tuning from 9V to >30V using two external resistors - supports 3–10 white LEDs in series under varying input conditions. |
| Integrated 1.3A, 0.4Ω N-MOSFET | Eliminates need for external power switch; simplifies layout and improves reliability in space-constrained portable applications. |
| True PWM dimming with ±3% accuracy | Ensures repeatable, linear luminance scaling across 0–100% duty cycle - essential for display uniformity and human-eye perception compliance. |
Applications
| Smartphone Backlighting | Digital Picture Frame |
|---|---|
|
Use Scenario: Driving 3–5 parallel strings of 5–7 white LEDs for high-brightness, low-power smartphone LCD backlight. IC Role / Device Role / Timing Role: Constant-current boost controller with dual PWM dimming for ambient-adaptive brightness and smooth transition between daylight/night modes. Use Value: Achieves >85% efficiency at 3.7V input and 15V/120mA output, extending battery life while maintaining ±3% luminance linearity across 1000:1 dimming range. |
Use Scenario: Powering 9 parallel strings of 3 white LEDs in a 7-inch digital photo frame with variable ambient light sensing. IC Role / Device Role / Timing Role: Dual-input PWM-controlled LED driver enabling independent adjustment of warm/cool white channels for dynamic color temperature tuning. Use Value: Leverages multiplicative dimming (PWMIA × PWMIB) to deliver 10-bit-equivalent grayscale resolution without additional DAC or MCU resources. |
| Portable Media Player | Digital Camera LCD Viewfinder |
|
Use Scenario: Backlighting a 4.3-inch WVGA TFT display in an audio/video player operating from 3.3V rail with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) boost converter minimizing inductor size and EMI, with thermal shutdown protecting against enclosure overheating. Use Value: Enables use of 2.2µH shielded inductor and 4.7µF X5R output capacitor - reducing solution footprint by 40% vs. 500kHz alternatives. |
Use Scenario: Driving 6-series, 2-parallel white LED strings for a high-luminance, low-latency viewfinder in compact digital cameras. IC Role / Device Role / Timing Role: Fast-response current-mode regulator with soft-start and short-circuit protection to prevent LED damage during lens actuation transients. Use Value: Internal 1.3A current limit and <240µs short-circuit detection prevent catastrophic failure during mechanical shock-induced LED shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Single PWM input only; 1.5MHz switching frequency; no dual-dimming multiplication; 300mV ISET reference. | Lacks independent dual-channel dimming; lower efficiency due to higher feedback voltage; limited to simpler UI brightness control. | Choose when cost sensitivity outweighs dimming precision and multiplicative control is unnecessary. |
| TPS61165DRVR | 2.2MHz switching; single PWM input; 200mV ISET; but no programmable OVP and no thermal shutdown with auto-recovery. | Requires external OVP circuitry; less robust in unattended portable deployments where thermal runaway risk exists. | Prefer when board space permits discrete protection and system-level thermal management is already implemented. |
Compared with RT9397BZSP and TPS61165DRVR, the MP3308DL-LF-P uniquely delivers dual independent PWM dimming with multiplicative control, programmable OVP, and integrated thermal shutdown with auto-recovery - making it optimal for compact, self-contained, ambient-adaptive backlight systems requiring high reliability and fine-grained luminance resolution.
Availability
MP3308DL-LF-P is available at Aetrix Electronics and suitable for smartphone backlighting, digital picture frames, portable media players, and digital camera viewfinders requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3308DL-LF-P 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 MP3308 belongs to MPS's white LED backlight driver product line, engineered specifically for space-constrained portable displays requiring high efficiency, precise dimming, and robust fault protection without external power switches.
FAQ
What is the maximum number of white LEDs the MP3308DL-LF-P can drive in series?
The MP3308DL-LF-P supports up to 10 white LEDs in series, assuming typical forward voltage of 3.0–3.6V per LED and maximum output voltage of ~36V (limited by SW pin rating). With 3.3V input, practical configuration is 5–7 LEDs; with 5V input, up to 9–10 LEDs is achievable depending on thermal design and efficiency targets.
How does dual PWM dimming work on the MP3308DL-LF-P?
Dual PWM dimming uses independent signals on PWMIA and PWMIB pins, each internally filtered to generate analog control voltages at PWMOA and PWMOB. The resulting LED current is proportional to the product of both duty cycles (DA × DB), enabling exponential dimming curves and fine-grained luminance control without software interpolation.
Can the MP3308DL-LF-P operate from a 3.3V input supply?
Yes - the MP3308DL-LF-P operates from 2.5V to 6V input, making it fully compatible with standard 3.3V system rails. At 3.3V input, it can drive up to 3–5 white LEDs in series (9–18V output) with >82% efficiency, provided inductor DCR and PCB layout minimize conduction losses.
What is the purpose of the FSET pin and how is it configured?
The FSET pin sets the PWM dimming frequency using an external capacitor to GND. Frequency follows fPWM = 16176 / CFSET(nF); for example, a 10nF capacitor yields ~1.6kHz. Recommended range is 50Hz–50kHz. This pin does not affect switching frequency (fixed at 2.2MHz) but controls dimming modulation rate to avoid audible noise and ensure smooth transitions.
Is the exposed thermal pad (Pin 2) required to be connected to ground?
Yes - the exposed pad (Pin 2, labeled PGND) must be soldered to a dedicated PCB ground plane with multiple thermal vias. It serves as the primary thermal path and high-current return for the SW node. Leaving it unconnected degrades thermal performance by >40°C and risks thermal shutdown or reduced current capability.
Does the MP3308DL-LF-P support analog dimming in addition to PWM?
No - the MP3308DL-LF-P supports only true PWM dimming via its dual PWM inputs. Analog dimming (via ISET voltage modulation) is not supported; the ISET pin is strictly a current-sense reference node regulated to 200mV. Brightness control is exclusively achieved through PWMIA/PWMIB duty cycle manipulation.
What protection features are integrated into the MP3308DL-LF-P?
The MP3308DL-LF-P integrates under-voltage lockout (2.3V turn-on, 30mV hysteresis), over-voltage protection (adjustable via OVP pin), short-circuit protection (triggers if ISET voltage exceeds 0.4V for >240µs), thermal shutdown (150°C), and current limiting (1.33A typical). All protections feature automatic recovery except OVP, which requires power cycle reset.
MP3308DL-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFDFN 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:
- 36V
- Current - Output / Channel:
- 1.33A (Switch)
- Frequency:
- 2.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP3308DL-LF-P FAQ
1.How can I place an order for MP3308DL-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3308DL-LF-P 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 MP3308DL-LF-P reliable?
The price and inventory of MP3308DL-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3308DL-LF-P is usually 5 days.
3.What payment methods are accepted for MP3308DL-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3308DL-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3308DL-LF-P?
MP3308DL-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3308DL-LF-P 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 MP3308DL-LF-P?
For technical support, including MP3308DL-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3308DL-LF-P requirements.
6.How does Aetrix verify that MP3308DL-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3308DL-LF-P 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 MP3308DL-LF-P meets industry standards.
7.What is the process for return or replacement of MP3308DL-LF-P?
All MP3308DL-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3308DL-LF-P, 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 MP3308DL-LF-P part is unused and in its original packaging.
Return procedure for MP3308DL-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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