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Monolithic Power Systems Inc. MP3309CGQG-Z
- Part No.:
- MP3309CGQG-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 10-VFQFN
- Datasheet:
-
MP3309CGQG-Z.pdf
- Description:
- IC LED DRIVER RGLTR PWM 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,315
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Product details
Overview
MP3309CGQG-Z from Monolithic Power Systems is a white LED step-up converter IC designed for portable backlighting applications, featuring 2.7V–5.5V input, up to 38V output, programmable switching frequency (300kHz–1.2MHz), ±1% 200mV feedback reference, and I²C interface for digital LED current and protection configuration. It supports synchronous/non-synchronous operation, analog/PWM dimming, and delivers regulated current to single-string or matrix LED arrays in smartphones and tablets.
For engineers reviewing the MP3309CGQG-Z datasheet, MP3309CGQG-Z pinout, MP3309CGQG-Z application, or MP3309CGQG-Z equivalent, key selection criteria include its 10-pin QFN-1.4×1.8mm package, I²C address 0x17, 400kHz-compatible bus timing, 32-step soft-start with 320μs ramp, and digitally adjustable OVP thresholds (13.5V/24V/35.5V) for open-string protection.
Technical Context
The MP3309CGQG-Z employs peak-current-mode control with internal ramp compensation to stabilize operation above 50% duty cycle. Its dual-mode power stage-configurable via I²C register bit SYNC-supports either integrated synchronous rectification (reducing external BOM) or external Schottky diode operation (optimized for high-VOUT/high-fSW conditions).
LED current regulation is implemented through a precision 200mV FB reference with ±1% accuracy at 25°C, while dimming is handled either by PWM applied to EN/PWML (with 20ms shutdown timeout) or digitally via I²C-controlled D0–D4 bits that scale VREF from 0mV to 200mV in 31 discrete steps. Fault reporting (LEDO, OTP, VOS) is read-only and accessible over the same I²C bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - Supports single-cell Li-ion and Li-poly battery systems without pre-regulation. |
| Output Voltage Capability | Up to 38V - Drives up to 12 white LEDs (3.1V each) in series under worst-case forward voltage variation. |
| Feedback Reference Voltage | 200mV ±1% - Enables accurate LED current setting with low-power, low-value sense resistors (e.g., 10Ω for 20mA). |
| Switching Frequency Range | 300kHz to 1.2MHz - Programmable via external resistor on FREQ pin; balances efficiency, EMI, and inductor size. |
| I²C Interface Speed | 400kHz - Full-speed mode compatible with standard microcontroller peripherals; supports real-time OVP and current tuning. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - Ensures safe recovery after transient overload without latch-off behavior. |
| Quiescent Current | 420μA - Minimizes battery drain during active display operation with no load. |
| Package | QFN-10 (1.4mm × 1.8mm, 0.5mm pitch) - Ultra-compact footprint optimized for space-constrained mobile PCB layouts. |
Pinout & Package
MP3309CGQG-Z is housed in a thermally enhanced 10-pin QFN package (1.4mm × 1.8mm, 0.5mm pitch) with exposed thermal pad. The package supports efficient heat dissipation in thin-profile handheld devices and enables high-density routing with minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SDA | I²C data line | Bi-directional serial data interface; requires pull-up resistor; supports fault register reads and current/OVP configuration writes. |
| 2 VIN | Main power input | Supplies internal logic and gate drivers; must be bypassed locally with ≥2.2μF ceramic capacitor near pin. |
| 3 EN/PWML | Enable & PWM dimming input | Active-high enable; accepts 100Hz–2kHz PWM signal for brightness control; low >20ms forces shutdown. |
| 4 FREQ | Frequency programming node | Connects to GND via resistor (e.g., 200kΩ → 600kHz); floating state invalid; sets oscillator timing and efficiency trade-off. |
| 5 FB | Current sense feedback | Regulates voltage across external sense resistor to 200mV; determines LED current magnitude; must not float. |
| 6 GND | Power and signal ground | Common return path for VIN, SW, VOUT, and logic; connects to thermal pad for thermal performance. |
| 7 SW | Switch node | Drain of internal low-side MOSFET; connects to inductor; carries high di/dt; critical for EMI layout. |
| 8 VOUT | Boost output | Source of internal synchronous MOSFET; supplies LED string; monitored for OVP and short-to-GND detection. |
| 9 BST | Bootstrap supply | Connects to SW via 0.1μF ceramic capacitor; powers high-side gate driver for synchronous rectifier. |
| 10 SCL | I²C clock line | Unidirectional clock input; requires pull-up; defines timing for all I²C transactions including register access. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous/Non-synchronous Mode Select | Configurable via I²C register bit SYNC; eliminates external diode in sync mode (efficiency gain), enables Schottky use in non-sync mode for high-VOUT. |
| Digitally Adjustable OVP Thresholds | Three user-selectable levels (13.5V, 24V, 35.5V) via OVP0/OVP1 bits; allows matching to LED string voltage margin and output capacitor rating. |
| 32-Step Soft-Start with 320μs Ramp | Prevents inrush current during enable; limits startup peak inductor current to 0.7A for 5ms; ensures stable LED turn-on. |
| Integrated Fault Reporting | Read-only LEDO (open-string), OTP (over-temperature), and VOS (VOUT-to-GND short) bits accessible over I²C for system-level diagnostics. |
| Low 200mV Feedback Voltage | Reduces power loss in current-sense resistor by 80% vs. typical 1V references; enables use of 10Ω/0.1W resistors for 20mA LED drive. |
| UVLO with 200mV Hysteresis | Enables at VIN ≥2.5V, disables at VIN ≤2.3V; prevents erratic operation during battery brown-out or cold start. |
Applications
| Smartphone Backlighting | Tablet Display Driver |
|---|---|
|
Use Scenario: Driving 6–10 white LEDs in series for LCD backlight in compact smartphone form factor with single-cell battery supply. IC Role / Device Role / Timing Role: Primary WLED boost controller; regulates constant current using FB pin; synchronizes dimming via EN/PWML PWM or I²C analog scaling. Use Value: 200mV reference minimizes sense resistor power loss; QFN-10 footprint saves PCB area; I²C configurability enables dynamic OVP adaptation during varying ambient temperature. |
Use Scenario: Powering multi-string (e.g., 3×3) LED array for 7–10 inch tablet displays requiring uniform brightness and low EMI. IC Role / Device Role / Timing Role: Central LED current regulator with programmable fSW (600kHz default); uses I²C to coordinate current matching across strings and report open-circuit faults. Use Value: 300kHz–1.2MHz frequency tuning reduces inductor size and audible noise; thermal shutdown (150°C) protects against sustained high-brightness operation. |
| Feature Phone Display | Portable Media Player UI Lighting |
|
Use Scenario: Cost-sensitive monochrome or color STN/TFT display backlight in legacy feature phones with limited PCB space and battery capacity. IC Role / Device Role / Timing Role: Low-quiescent-current (420μA) boost driver; uses analog dimming via I²C for smooth brightness transitions without PWM flicker. Use Value: Non-synchronous mode option allows use of low-cost Schottky diodes; UVLO hysteresis prevents restart oscillation during weak battery conditions. |
Use Scenario: Controlling RGB or white indicator LEDs on portable audio/video players with host MCU managing multiple lighting zones. IC Role / Device Role / Timing Role: I²C-addressable (0x17) LED driver enabling centralized brightness and fault monitoring across multiple devices on shared bus. Use Value: Read-only fault registers (LEDO/OTP/VOS) allow host to detect and log LED failures without additional sensing circuitry; 400kHz I²C speed supports fast configuration updates. |
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 1.2MHz fSW; no I²C interface; analog dimming only; 200mV VFB; QFN-10 package. | Lacks digital OVP/current tuning and fault reporting; suited for fixed-brightness, cost-sensitive designs without host MCU coordination. | Select when I²C functionality is unnecessary and board space allows slightly higher quiescent current (600μA). |
| LM3409QMY/NOPB | Adjustable current sense threshold (50–200mV); no integrated MOSFETs; requires external high-side switch; SOIC-8 package. | Supports higher output voltages (>40V); demands more external components; lacks integrated protection reporting and soft-start. | Choose for industrial or automotive LED systems needing >38V output or discrete power stage control, accepting larger footprint and design complexity. |
Compared with RT9397BZSP and LM3409QMY/NOPB, MP3309CGQG-Z uniquely integrates I²C-configurable OVP, 32-step soft-start, and read-only fault registers in a 1.4×1.8mm QFN, making it optimal for space-constrained, intelligence-aware portable displays where firmware-driven LED management is required.
Availability
MP3309CGQG-Z is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display drivers, feature phone displays, and portable media player UI lighting requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP3309CGQG-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 MP3309C product line targets portable display backlighting, delivering high-efficiency, digitally configurable WLED boost drivers optimized for battery-powered consumer electronics with stringent size and thermal constraints.
FAQ
What is the I²C address of MP3309CGQG-Z and how is it configured?
The MP3309CGQG-Z has a fixed 7-bit I²C slave address of 0x17 (0b0001011), with no hardware address pins. Communication uses standard START/STOP conditions, and the device responds only to this address followed by a read/write bit. No external pull-up resistors beyond typical I²C bus requirements are needed on SDA/SCL lines.
Can MP3309CGQG-Z drive multiple parallel LED strings?
No - MP3309CGQG-Z is designed for single-string operation with one FB node. Driving parallel strings requires individual current-setting resistors per string and risks mismatch due to VF variation; for multi-string applications, use separate MP3309CGQG-Z units or dedicated multi-channel drivers like MP3378.
How does the EN/PWML pin behave during PWM dimming versus enable control?
EN/PWML serves dual function: a logic-high level enables normal operation; a PWM signal applied here directly modulates LED current amplitude. If the pin remains low for >20ms, the IC shuts down completely. For dimming, use 100Hz–2kHz frequencies; lower frequencies cause visible flicker, higher ones risk mis-triggering shutdown.
What is the maximum recommended LED string voltage and why is it limited to 38V?
The absolute maximum VOUT rating is 40V, but the device is characterized and specified for reliable operation up to 38V. Exceeding this risks violating the internal synchronous MOSFET's breakdown limit and triggering OVP prematurely; sustained operation above 38V may degrade long-term reliability even if within absolute max ratings.
Does MP3309CGQG-Z support automatic current calibration or trimming?
No - LED current is set externally via the FB sense resistor and optionally scaled digitally using the D0–D4 bits (0–31 steps). There is no factory-trimmed or auto-calibrated current reference; accuracy depends on resistor tolerance (±1% recommended) and VREF spec (±1% at 25°C).
What thermal derating applies to the QFN-10 package at elevated ambient temperatures?
With θJA = 140°C/W on a 4-layer JEDEC PCB, power dissipation must be reduced linearly above 25°C ambient. At TA = 85°C, maximum continuous power drops to ~0.63W; thermal shutdown activates at 150°C junction temperature, with 25°C hysteresis ensuring safe restart below 125°C.
Is the BST capacitor mandatory, and what value is recommended?
Yes - the BST capacitor (0.1μF X7R ceramic, rated ≥10V) between BST and SW is mandatory for proper gate drive of the internal synchronous MOSFET. Omitting it causes insufficient high-side drive, leading to excessive conduction loss, overheating, and potential failure of the internal power stage.
MP3309CGQG-Z 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:
- -
- 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)
MP3309CGQG-Z FAQ
1.How can I place an order for MP3309CGQG-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3309CGQG-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 MP3309CGQG-Z reliable?
The price and inventory of MP3309CGQG-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3309CGQG-Z is usually 5 days.
3.What payment methods are accepted for MP3309CGQG-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3309CGQG-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3309CGQG-Z?
MP3309CGQG-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3309CGQG-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 MP3309CGQG-Z?
For technical support, including MP3309CGQG-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3309CGQG-Z requirements.
6.How does Aetrix verify that MP3309CGQG-Z is sourced from the original manufacturer or authorized distributors?
All MP3309CGQG-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 MP3309CGQG-Z meets industry standards.
7.What is the process for return or replacement of MP3309CGQG-Z?
All MP3309CGQG-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3309CGQG-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 MP3309CGQG-Z part is unused and in its original packaging.
Return procedure for MP3309CGQG-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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