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Monolithic Power Systems Inc. MP3309AGQ-Z
- Part No.:
- MP3309AGQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP3309AGQ-Z.pdf
- Description:
- IC LED DRIVER RGLTR PWM 10QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MP3309AGQ-Z from Monolithic Power Systems is a synchronous boost white LED driver IC designed for portable backlighting applications. It operates from 2.7V–5.5V input, delivers up to 35.5V output, regulates LED current via 200mV ±1% feedback voltage, supports analog and PWM dimming, and features programmable switching frequency (300kHz–1.2MHz) for efficiency optimization in space-constrained designs like smartphones and tablets.
For engineers reviewing the MP3309AGQ-Z datasheet, MP3309AGQ-Z pinout, MP3309AGQ-Z application, or MP3309AGQ-Z equivalent, key selection criteria include its 3×3mm QFN10 package, dual-dimming interface (EN/PWML + PWMH), 35.5V over-voltage protection threshold, cycle-by-cycle current limiting (1.4–1.8A), and thermal shutdown at 150°C - all critical for reliable WLED string control in battery-powered displays.
Technical Context
The MP3309AGQ-Z employs peak-current-mode control with internal ramp compensation to stabilize operation above 50% duty cycle. Its error amplifier compares 200mV reference against FB-sensed resistor voltage to adjust MOSFET on-time, enabling precise LED current regulation independent of input or output voltage variations.
It integrates two power switches: a low-side N-channel MOSFET (RDSON = 0.3–0.5Ω) and a synchronous high-side N-channel MOSFET (RDSON = 0.5–0.8Ω), eliminating external Schottky diode requirements. Protection logic monitors VOUT for open-string detection, triggers shutdown if VOVP ≥ 35.5V, and enforces 20ms EN/PWML low-level timeout for hardware disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V–5.5V - supports single-cell Li-ion and USB-powered systems without LDO pre-regulation. |
| Output Voltage Capability | Up to 35.5V - sufficient for driving 8-series white LEDs (≈3.2V each) with margin for forward voltage variation. |
| Feedback Voltage | 200mV ±1% - enables use of low-value, high-precision current-sense resistors (e.g., 10Ω for 20mA) minimizing I²R loss. |
| Switching Frequency | Programmable 300kHz–1.2MHz via FREQ pin resistor - allows trade-off between inductor size (higher fSW → smaller L) and efficiency (lower fSW → lower switching loss). |
| OVP Threshold | 35.5V with 2.5V hysteresis - prevents destructive overvoltage during LED string open-circuit failure while ensuring fast recovery after fault clearance. |
| Thermal Shutdown | 150°C with 25°C hysteresis - protects die under sustained overload or poor PCB thermal design; resumes operation only after junction cools below 125°C. |
| Quiescent Current | 420μA at 3.6V - extends battery life in always-on display subsystems during active dimming control. |
Pinout & Package
MP3309AGQ-Z is housed in a thermally enhanced 3×3mm QFN10 package with exposed thermal pad, optimized for compact portable PCB layouts and efficient heat dissipation in thin-profile devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Boost output node | Connects to LED anode string; senses open-circuit condition for OVP protection; requires ceramic output capacitor (0.33–3.3μF) near IC. |
| SW | Power switch node | Drain of internal low-side MOSFET; connects to inductor; forms high-di/dt loop with BST and VOUT - must be routed short and wide. |
| GND | Power and signal ground | Common return for FB, EN/PWML, PWMH, FREQ; must tie directly to exposed thermal pad for thermal and noise integrity. |
| FB | Current sense feedback | Regulates voltage across external sense resistor to 200mV; high-impedance input - keep trace short and away from noisy nodes. |
| FREQ | Frequency programming | Resistor-to-GND sets oscillator frequency per fSW = 128000 / RFREQ(kΩ); floating prohibited - ensures stable switching behavior. |
| EN/PWML | Enable & PWM dimming input | Active-high enable; accepts 100Hz–2kHz PWM for brightness control; >20ms low pulse forces shutdown - enables hardware safety lockout. |
| VIN | Input supply | Accepts 2.7–5.5V; requires local 2.2–10μF ceramic bypass capacitor close to pin to suppress input ripple and EMI. |
| PWMH (x2) | Analog dimming inputs | Dual pins tied together accept >20kHz PWM for analog dimming; internal RC filter converts duty cycle to DC current setpoint - avoids audible noise. |
| BST | Bootstrap supply | Connects to SW via 0.1μF ceramic capacitor; powers gate driver for synchronous high-side MOSFET - critical for efficiency above 50% duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and PCB area - improves efficiency by ~5–8% vs. non-synchronous mode at low LED string voltages. |
| Dual dimming interface | Independent EN/PWML (100Hz–2kHz) and PWMH (≥20kHz) paths allow simultaneous hardware enable, PWM brightness control, and flicker-free analog dimming without MCU resource conflict. |
| Programmable fSW | Resistor-based frequency setting (300kHz–1.2MHz) enables system-level EMI tuning and inductor size optimization - e.g., 640kHz with 200kΩ yields optimal balance for 8-LED strings. |
| Comprehensive protection suite | Integrated OVP (35.5V), cycle-by-cycle current limit (1.4–1.8A), thermal shutdown (150°C), UVLO (2.5V), and open-string detection - reduces need for external fault monitoring circuitry. |
| Low IQ and shutdown current | 420μA operating and 1μA shutdown quiescent currents extend battery runtime in standby and off states - critical for always-connected mobile displays. |
Applications
| Smartphone Backlighting | Tablet Display Driver |
|---|---|
|
Use Scenario: Driving 6–8 series white LEDs in high-resolution AMOLED/LCD panels with dynamic brightness scaling. IC Role / Device Role / Timing Role: Primary WLED current regulator with synchronized PWM dimming and analog fine-tuning for smooth luminance transitions. Use Value: 200mV feedback precision ensures consistent LED brightness across temperature (-40°C to +85°C), while 35.5V OVP prevents panel damage during LED string failure. |
Use Scenario: Powering dual-zone edge-lit LCD backlights requiring independent brightness control per zone. IC Role / Device Role / Timing Role: Dual-channel capable driver (using two MP3309AGQ-Z) delivering matched current regulation and synchronized dimming timing. Use Value: Programmable fSW allows EMI alignment between zones; QFN10 footprint minimizes board area in tight bezel designs. |
| Portable Medical Display | Industrial HMI Panel |
|
Use Scenario: Illuminating diagnostic-grade TFT displays in handheld ultrasound or patient monitors where reliability and low noise are critical. IC Role / Device Role / Timing Role: High-accuracy LED current source with thermal shutdown and UVLO to maintain safe operation during battery voltage sag or ambient temperature extremes. Use Value: 1μA shutdown current preserves battery charge during extended idle periods; 25°C thermal hysteresis prevents cycling near trip point. |
Use Scenario: Backlighting ruggedized touchscreens in factory automation panels exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Robust boost controller with cycle-by-cycle current limiting and open-string protection to withstand intermittent LED faults in harsh environments. Use Value: QFN10 package with exposed pad ensures stable thermal performance at +85°C ambient; 2.7V UVLO start-up supports aging battery operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3302DJ-LF-P | Fixed 1.2MHz fSW, no FREQ pin; 30V OVP; 10-pin MSOP package (larger footprint) | Limited frequency flexibility; lower OVP margin reduces safety headroom for 8-LED strings | Choose when board space permits larger package and fixed high-frequency operation is acceptable for EMI filtering simplicity. |
| LM3409QMHX/NOPB | Asynchronous design requiring external Schottky; 40V OVP; SO-8 package; no analog dimming support | Higher conduction loss; lacks PWMH interface for flicker-free dimming; larger thermal footprint | Prefer only when cost sensitivity outweighs efficiency and dimming quality requirements in non-portable applications. |
Compared with MP3302DJ-LF-P and LM3409QMHX/NOPB, MP3309AGQ-Z provides superior integration (synchronous, dual-dimming, programmable fSW), tighter OVP accuracy (±1% vs. ±5%), and smallest PCB footprint - making it optimal for next-gen portable displays demanding efficiency, reliability, and compactness.
Availability
MP3309AGQ-Z is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display drivers, portable medical displays, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3309AGQ-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 MP3309A product line targets portable display backlighting, emphasizing high efficiency, small form factor, and robust protection - specifically engineered for battery-powered consumer and medical devices where thermal, size, and reliability constraints dominate design.
FAQ
What is the minimum recommended input capacitance for MP3309AGQ-Z?
A 2.2μF X5R/X7R ceramic capacitor placed within 2mm of VIN and GND is the minimum recommended value. This ensures low impedance at switching frequencies up to 1.2MHz, suppresses input surge current, and maintains stability during PWM dimming transients. Larger values (up to 10μF) improve hold-up time during brief input dips.
Can MP3309AGQ-Z drive more than 8 white LEDs in series?
No - the 35.5V OVP threshold and typical white LED forward voltage of 3.2V–3.6V limit practical operation to ≤8 LEDs (28.8V–28.8V max nominal). Attempting 9+ LEDs risks triggering OVP during normal operation due to forward voltage tolerance stacking and temperature drift, causing intermittent shutdown.
How does the MP3309AGQ-Z handle analog dimming without audible noise?
It uses two PWMH pins accepting >20kHz PWM signals, internally filtered by an RC network to generate a stable DC current setpoint. This eliminates low-frequency switching artifacts that cause coil whine or LED flicker, enabling silent, smooth brightness control ideal for medical and audio-sensitive environments.
Is the BST capacitor mandatory, and what value is required?
Yes - the BST capacitor (0.1μF X7R ceramic, rated ≥10V) is mandatory for synchronous operation. It supplies gate drive voltage to the internal high-side MOSFET. Omitting it forces non-synchronous mode, increasing power loss and thermal stress. Placement must be adjacent to BST and SW pins with minimal trace length.
What happens if the FREQ pin is left floating?
Leaving FREQ floating causes undefined switching frequency, leading to erratic regulation, increased EMI, and potential thermal runaway. The datasheet explicitly prohibits this. A pull-down resistor to GND (e.g., 200kΩ for 640kHz) must be used - no capacitor or open circuit is acceptable.
Does MP3309AGQ-Z support I²C or other digital interfaces?
No - MP3309AGQ-Z is an analog-controlled LED driver with dedicated EN/PWML and PWMH pins only. It lacks digital communication interfaces. Brightness and enable control are implemented exclusively through external PWM signals or DC voltage levels applied to those pins.
How is open-string protection triggered and cleared?
Open-string protection activates when FB voltage falls below 200mV (indicating no LED current), causing VOUT to rise until it reaches 35.5V. At that point, switching halts. Protection clears automatically when VOUT drops below 33.0V (35.5V – 2.5V hysteresis), allowing restart once the LED string is restored.
MP3309AGQ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 35V
- Current - Output / Channel:
- -
- Frequency:
- 640kHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP3309AGQ-Z FAQ
1.How can I place an order for MP3309AGQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3309AGQ-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 MP3309AGQ-Z reliable?
The price and inventory of MP3309AGQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3309AGQ-Z is usually 5 days.
3.What payment methods are accepted for MP3309AGQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3309AGQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3309AGQ-Z?
MP3309AGQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3309AGQ-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 MP3309AGQ-Z?
For technical support, including MP3309AGQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3309AGQ-Z requirements.
6.How does Aetrix verify that MP3309AGQ-Z is sourced from the original manufacturer or authorized distributors?
All MP3309AGQ-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 MP3309AGQ-Z meets industry standards.
7.What is the process for return or replacement of MP3309AGQ-Z?
All MP3309AGQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3309AGQ-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 MP3309AGQ-Z part is unused and in its original packaging.
Return procedure for MP3309AGQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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