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Monolithic Power Systems Inc. MP3309GQG-P
- Part No.:
- MP3309GQG-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 10-VFQFN
- Datasheet:
-
MP3309GQG-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
MP3309GQG-P from Monolithic Power Systems is a synchronous boost white LED driver IC with 2.7V–5.5V input, 35V output capability, 200mV ±1% feedback reference, programmable 300kHz–1.2MHz switching frequency, and dual analog/PWM dimming support-used to drive up to 8-series white LEDs in compact portable displays.
For engineers reviewing the MP3309GQG-P datasheet, MP3309GQG-P pinout, MP3309GQG-P application, or MP3309GQG-P equivalent, key selection criteria include low-side current-sense architecture, open-string OVP at 35.5V, thermal shutdown at 150°C, QFN-10 (1.4mm×1.8mm) footprint, and EN/PWML shutdown timing of 20ms.
Technical Context
The MP3309GQG-P implements peak-current mode control with internal ramp compensation to ensure stability at duty cycles >50%. It integrates a 0.3Ω main switch and 0.5Ω synchronous rectifier MOSFET, enabling high-efficiency step-up conversion without external diodes.
Dimming is implemented via two independent paths: EN/PWML accepts 200Hz–2kHz PWM for coarse brightness control with shutdown protection, while PWMH supports >20kHz analog dimming using internal RC filtering-enabling flicker-free operation in sensitive display applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-poly, or 3×AA/AAA battery inputs without pre-regulation. |
| Output Voltage Capability | Up to 35V - sufficient to drive 8-series white LEDs (3.2V × 8 = 25.6V) with margin for voltage drop and ripple. |
| Feedback Reference Voltage | 200mV ±1% - enables precise LED current regulation using low-value, low-power sense resistors (e.g., 10Ω for 20mA). |
| Switching Frequency Range | 300kHz to 1.2MHz - programmable via external resistor on FREQ pin to balance efficiency, EMI, and inductor size. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| OVP Threshold | 35.5V ±2V - protects against LED string open-circuit failure by halting switching until VOUT drops below 33V. |
| Quiescent Current | 420μA - minimizes battery drain in always-on display backlight systems during active operation. |
Pinout & Package
MP3309GQG-P is housed in a thermally enhanced QFN-10 package (1.4mm × 1.8mm, 0.5mm pitch) with exposed thermal pad for efficient heat dissipation in space-constrained mobile designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,10 PWMH | Analog dimming input | Accepts >20kHz PWM signal; internal RC filter converts duty cycle to analog current setpoint-enables flicker-free dimming. |
| 2 VIN | Main power input | Supplies internal logic and gate drivers; requires local 4.7μF ceramic bypass capacitor to suppress high-frequency noise. |
| 3 EN/PWML | Enable / PWM dimming control | Active-high enable; low-level pulse >20ms forces shutdown-provides fail-safe disable and coarse brightness control. |
| 4 FREQ | Frequency programming node | Resistor-to-GND sets oscillator frequency per fSW(kHz) = 120000/ROSC(kΩ); floating pin disables operation. |
| 5 FB | Current-sense feedback | Regulates voltage across external sense resistor to 200mV-directly determines LED current ILED = 200mV/RFB. |
| 6 GND | Power and signal reference | Common return for all circuits; must be connected to thermal pad and low-impedance ground plane to ensure stability. |
| 7 SW | Switch node | Drain of internal low-side MOSFET; connects to inductor; carries high di/dt current-requires minimal loop area to reduce EMI. |
| 8 VOUT | Boost output | Source of synchronous MOSFET; delivers regulated output to LED anode string; monitored for open-string OVP. |
| 9 BST | Bootstrap supply | Capacitor between BST and SW provides gate drive voltage for synchronous rectifier-enables 100% duty-cycle capability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrates 0.5Ω sync MOSFET-eliminates Schottky diode loss, improves efficiency by ~8% vs. non-sync designs at 20mA. |
| Programmable switching frequency | 300kHz–1.2MHz range via single external resistor-allows optimization for EMI compliance, inductor size, and light-load efficiency. |
| Dual dimming interface | Independent EN/PWML (200Hz–2kHz) and PWMH (>20kHz) pins-supports both legacy PWM dimming and high-frequency analog dimming in same IC. |
| Open-string OVP protection | 35.5V threshold with 2.5V hysteresis-detects LED string breakage and halts switching before output capacitor overvoltage. |
| Internal soft-start | Reduces startup inrush by limiting current to 0.8A for 5ms-prevents input voltage sag and avoids false UVLO triggering. |
Applications
| Smartphone Backlight | Tablet Display Backlight |
|---|---|
Use Scenario: Driving 6–8 white LEDs in series behind AMOLED or LCD panels in sub-7-inch smartphones. IC Role / Device Role / Timing Role: Primary WLED boost controller regulating constant current via low-side sense resistor; manages dimming via host processor GPIO signals. Use Value: 200mV feedback reference enables <1% LED current matching across strings; QFN-10 footprint saves board area in tight bezel designs. | Use Scenario: Powering 3×3 LED array (9 LEDs total) for uniform backlighting in 7–10 inch tablets with dynamic local dimming zones. IC Role / Device Role / Timing Role: High-efficiency boost driver with dual-dimming support-EN/PWML for system-level brightness control, PWMH for fine-grained zone modulation. Use Value: Programmable fSW allows EMI tuning to avoid interference with Wi-Fi/Bluetooth bands; thermal shutdown ensures reliability under prolonged video playback. |
| Portable Media Player Display | Industrial HMI Panel |
Use Scenario: Backlighting high-brightness QVGA or WVGA LCDs in handheld media players with battery life constraints. IC Role / Device Role / Timing Role: Step-up LED driver operating from single-cell Li-ion (3.0–4.2V); uses analog dimming for smooth brightness transitions during UI navigation. Use Value: 420μA quiescent current extends standby time; 2.7V minimum input supports operation down to nearly depleted battery voltage. | Use Scenario: Reliable backlight control in industrial HMIs exposed to wide temperature ranges (−40°C to +85°C ambient). IC Role / Device Role / Timing Role: Robust LED driver with −40°C to +125°C junction rating, UVLO hysteresis, and cycle-by-cycle current limiting for harsh environments. Use Value: Thermal shutdown at 150°C with 25°C hysteresis prevents latch-up during enclosure overheating; RoHS/lead-free/halogen-free compliance meets industrial safety standards. |
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 | Fixed 1MHz switching frequency; no programmable fSW; 250mV feedback reference (±2%); no analog dimming pin. | Lacks PWMH analog dimming path-requires external DAC or MCU-controlled PWM generation for flicker-free dimming. | Select when fixed-frequency EMI profile is preferred and analog dimming is not required. |
| TPS61165DRVR | Higher 40V OVP; integrated 1.5A switch; 1.25V feedback (requires higher sense resistor power); no thermal shutdown hysteresis spec. | Supports longer LED strings (up to 12×), but higher VREF increases sense resistor power loss and thermal load. | Select when driving >8 LEDs or needing higher output headroom; verify thermal performance with layout. |
Compared with RT9397BZSP and TPS61165DRVR, MP3309GQG-P uniquely combines programmable frequency, 200mV precision feedback, and dual-dimming architecture in a 1.4mm×1.8mm QFN-making it optimal for compact, flicker-sensitive, battery-powered displays requiring design flexibility.
Availability
MP3309GQG-P is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display modules, and portable media player designs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP3309GQG-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.
The MP3309 belongs to MPS's WLED boost driver product line, engineered specifically for space-constrained, battery-powered portable displays requiring high efficiency, precise current regulation, and flexible dimming control.
FAQ
What is the minimum input voltage required for MP3309GQG-P to start switching?
The MP3309GQG-P features an under-voltage lockout (UVLO) with a rising threshold of 2.5V and 200mV hysteresis. It begins operation only when VIN rises above 2.5V and remains enabled down to 2.3V. Below 2.3V, the device shuts down to protect circuitry and prevent unstable regulation.
Can MP3309GQG-P drive multiple parallel LED strings?
No-MP3309GQG-P is designed for single-string operation with common-anode or common-cathode topology. Driving parallel strings would cause current mismatch due to forward-voltage variations; for multi-string applications, separate drivers or current-matching ICs are required.
How does the internal soft-start function during enable?
Upon EN/PWML assertion, MP3309GQG-P limits peak inductor current to 0.8A for 5ms before ramping to full 1.5A current limit. This controlled startup prevents input voltage droop, reduces stress on input capacitors, and avoids false triggering of UVLO or OCP during power-up.
What is the recommended capacitor value between BST and SW pins?
A 0.1μF X7R ceramic capacitor rated for ≥10V is recommended between BST and SW. This capacitor must be placed as close as possible to the IC to maintain gate-drive integrity; insufficient capacitance causes sync-FET turn-off delay and increased conduction loss.
Does MP3309GQG-P require an external Schottky diode?
No-MP3309GQG-P integrates a synchronous rectifier MOSFET connected to the VOUT pin, eliminating the need for an external Schottky diode. Using a diode would disable synchronous operation and degrade efficiency by ~10–15% at typical loads.
What happens if the FREQ pin is left unconnected?
The FREQ pin must not be left floating. An unconnected FREQ pin results in undefined switching frequency, potential instability, or complete failure to operate. A pull-down resistor to GND (e.g., 100kΩ for ~1.2MHz) or precise ROSC value per datasheet equation is mandatory for reliable operation.
How is LED open-circuit protection triggered and reset?
When the LED string opens, FB voltage falls below 200mV, causing the error amplifier output to rise and charge the output capacitor until VOUT reaches 35.5V. At that point, OVP triggers and switching halts. Recovery occurs automatically when VOUT drops below 33V (35.5V − 2.5V hysteresis) after fault removal.
MP3309GQG-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFQFN
- 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):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 35V
- Current - Output / Channel:
- 1.5A
- Frequency:
- 640kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (1.4x1.8)
MP3309GQG-P FAQ
1.How can I place an order for MP3309GQG-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3309GQG-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 MP3309GQG-P reliable?
The price and inventory of MP3309GQG-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3309GQG-P is usually 5 days.
3.What payment methods are accepted for MP3309GQG-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3309GQG-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3309GQG-P?
MP3309GQG-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3309GQG-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 MP3309GQG-P?
For technical support, including MP3309GQG-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3309GQG-P requirements.
6.How does Aetrix verify that MP3309GQG-P is sourced from the original manufacturer or authorized distributors?
All MP3309GQG-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 MP3309GQG-P meets industry standards.
7.What is the process for return or replacement of MP3309GQG-P?
All MP3309GQG-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3309GQG-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 MP3309GQG-P part is unused and in its original packaging.
Return procedure for MP3309GQG-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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