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Monolithic Power Systems Inc. MP2109DQ-LF-P
- Part No.:
- MP2109DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2109DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,784
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Product details
Overview
MP2109DQ-LF-P from Monolithic Power Systems is a dual-channel synchronous step-down DC-DC converter integrating two independent 1.2MHz current-mode PWM regulators, each delivering up to 800mA from 2.5V–6V input and regulating output down to 0.6V; it supports 100% duty cycle for low-dropout operation and features internal PFET/NFET switches eliminating external Schottky diodes-used in Li+-powered portable devices like smartphones and digital cameras.
For engineers reviewing the MP2109DQ-LF-P datasheet, MP2109DQ-LF-P pinout, MP2109DQ-LF-P application, or MP2109DQ-LF-P equivalent, key selection criteria include verified dual-channel 800mA capability, QFN10 (3mm × 3mm) thermal performance (θJA = 50°C/W), 0.6V feedback reference accuracy (±2%), short-circuit and thermal fault protection, and confirmed compatibility with standard 4.7µH inductors and ceramic input/output capacitors.
Technical Context
The MP2109DQ-LF-P implements dual independent current-mode PWM control with slope compensation, enabling stable regulation across >50% duty cycles and fast transient response via cycle-by-cycle peak current limiting. Each channel uses separate EN, FB, IN, SW, and GND pins, allowing independent enable/disable and output voltage setting.
Its functional block includes integrated 0.42Ω PFET main switches and 0.26Ω NFET synchronous rectifiers per channel, 1.2MHz oscillator (±20% tolerance), and a precision 0.600V ±2% feedback reference referenced to GND. Thermal shutdown triggers at 150°C, and UVLO activates at 2.30V (rising) with 55mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2MHz typical; enables compact 2.2–4.7µH inductor and low-profile ceramic capacitor selection. |
| Max Output Current (per channel) | 800mA continuous; supported by internal 0.42Ω PFET + 0.26Ω NFET switches and thermal shutdown at 150°C. |
| Input Voltage Range | 2.5V to 6V; matches single-cell Li+ battery (3.0–4.2V) and regulated 3.3V/5V rails. |
| Feedback Reference Voltage | 0.600V ±2% (–40°C to +85°C); sets output from 0.6V to 6V using external resistor divider. |
| Shutdown Current | <0.1µA per channel; enables ultra-low-power system sleep modes without external load switches. |
| Duty Cycle Capability | 100% dropout mode; maintains regulation when VIN ≈ VOUT, minimizing voltage headroom loss. |
| Protection Features | Short-circuit foldback (reduced fOSC & current limit), thermal shutdown, and UVLO with hysteresis. |
Pinout & Package
MP2109DQ-LF-P uses a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad on underside for PCB heat sinking. Pin 1 marked by top-side dot; pin numbering follows standard counter-clockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel 1 / Channel 2 Enable Input | Logic-level control: >1.5V = ON, <0.3V = shutdown (<0.1µA quiescent). |
| FB1 / FB2 | Channel 1 / Channel 2 Feedback Input | Connects to resistor divider midpoint; regulates output to 0.6V reference. |
| IN1 / IN2 | Channel 1 / Channel 2 Input Supply | Accepts 2.5–6V; requires local 2.2µF+ ceramic bypass to respective GND pin. |
| GND1 / GND2 | Channel 1 / Channel 2 Ground Return | Separate ground paths minimize crosstalk; connect to common system GND near exposed pad. |
| SW1 / SW2 | Channel 1 / Channel 2 Switch Node | Drain connection of internal PFET/NFET; routes to inductor; high dV/dt node requiring short trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFET/NFET power stage | Eliminates external Schottky diode; achieves up to 95% efficiency at 400mA with 3.3V→1.8V conversion. |
| Current-mode PWM with slope compensation | Enables stable operation at >50% duty cycle and provides inherent cycle-by-cycle overcurrent protection. |
| Independent dual-channel control | Each channel has dedicated EN, FB, IN, SW, and GND-supports asymmetric outputs (e.g., 1.8V/1.2V) and staggered sequencing. |
| 100% duty-cycle dropout mode | Maintains regulation as VIN approaches VOUT; critical for Li+ battery end-of-discharge (e.g., 3.0V→2.8V). |
| Thermal and short-circuit protection | Auto-recovering shutdown at 150°C junction temp; short-circuit foldback reduces fOSC and current limit to limit power dissipation. |
Applications
| Smartphone Core Power | DSP/Microprocessor Core Supply |
|---|---|
|
Use Scenario: Dual-rail core logic supply in LTE smartphones with application processor (1.2V) and GPU (1.05V) requiring independent enable control and tight load transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing regulated, low-noise DC power to SoC cores with independent channel sequencing. Use Value: 1.2MHz switching enables small 2.2µH inductors and 10µF ceramic output caps; 0.6V FB reference allows precise core voltage scaling per process node. |
Use Scenario: Dedicated core voltage supply for TI C6000 DSPs or ARM Cortex-A series processors operating from single-cell Li+ battery. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC-DC converter delivering stable 1.0–1.4V core rail with fast load-step recovery. Use Value: 800mA per channel meets typical DSP core current demand; 100% duty cycle sustains operation down to 2.8V battery voltage. |
| Portable Digital Camera Sensor Rail | Handheld Medical Instrument Power |
|
Use Scenario: Dual-output supply for CMOS image sensor (1.8V analog, 1.2V digital) and ISP in compact digital still/video cameras. IC Role / Device Role / Timing Role: Dual synchronous buck converter generating isolated, low-ripple analog and digital rails from shared Li+ input. Use Value: Separate GND1/GND2 pins reduce ground bounce between analog/digital domains; 95% efficiency extends battery runtime during burst capture. |
Use Scenario: Power management for portable ECG or pulse oximeter with mixed-signal front-end (2.5V ADC, 1.8V MCU, 3.3V display backlight). IC Role / Device Role / Timing Role: Compact dual-buck solution replacing discrete regulators to meet size, efficiency, and reliability requirements in Class II medical devices. Use Value: Internal compensation eliminates external loop components; <0.1µA shutdown current preserves battery charge during standby intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2149DQ-LF-Z | Successor device: higher 2MHz switching frequency, lower 0.5µA shutdown current, improved light-load efficiency (PFM mode), same QFN10 footprint. | Preferred for new designs targeting smaller magnetics, longer battery life, and tighter output ripple; not drop-in due to different EN threshold and FB compensation. | Select MP2149DQ-LF-Z for new designs requiring higher efficiency below 100mA or faster transient response; MP2109DQ-LF-P remains valid for legacy cost-sensitive or thermal-limited layouts. |
| TPS62400DRVR | TI dual 3MHz buck: 600mA/channel, 0.6V FB, but no 100% duty cycle; requires external compensation; different pinout and enable logic (active-low). | Suitable where higher frequency and smaller inductors are prioritized over dropout capability; lacks independent GND pins, increasing noise coupling risk. | Choose TPS62400DRVR only if board redesign accommodates pinout change and system tolerates ~0.2V dropout at low VIN; verify thermal margin with θJA = 60°C/W. |
Compared with MP2149DQ-LF-Z and TPS62400DRVR, MP2109DQ-LF-P offers unique 100% duty cycle and dual independent grounds-critical for noise-sensitive portable systems-but trades off light-load efficiency and modern feature set; its proven thermal performance in QFN10 makes it suitable for space-constrained industrial handhelds where design freeze is required.
Availability
MP2109DQ-LF-P is available at Aetrix Electronics and suitable for smartphone power management, portable medical instrumentation, digital camera sensor supplies, and DSP core voltage regulation requiring stable component supply across extended production lifecycles.
Supply support for MP2109DQ-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 expertise in DC-DC conversion, LED drivers, and motor control solutions since 1997.
The MP2109 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for space- and efficiency-constrained Li+-powered portable electronics requiring dual independent low-voltage rails.
FAQ
What is the maximum recommended ambient temperature for continuous 800mA operation on both channels?
At 70°C ambient, the MP2109DQ-LF-P's 50°C/W θJA yields ~1.6W max power dissipation before thermal shutdown. With typical 800mA/channel losses (~0.4W per channel at 3.3V→1.8V), full-load operation is viable up to ~65°C ambient assuming adequate PCB copper area under the exposed pad. Derating is required above this point.
Can MP2109DQ-LF-P operate with only one channel enabled while the other is disabled?
Yes-EN1 and EN2 are fully independent. Disabling one channel (ENx < 0.3V) reduces its quiescent current to <0.1µA without affecting the enabled channel's regulation, efficiency, or transient response. GND1 and GND2 remain isolated, preventing ground-loop interference.
Is an external compensation network required for stable operation?
No-the MP2109DQ-LF-P is internally compensated. The 17pF internal capacitor and transconductance amplifier are optimized for standard 4.7µH inductors and 10µF ceramic output capacitors. External compensation is neither needed nor supported per datasheet design guidelines.
What is the minimum output voltage achievable with the internal 0.6V reference?
The absolute minimum regulated output is 0.6V, set by the internal feedback reference. Lower voltages cannot be achieved because the FB pin must be held at exactly 0.6V for regulation; attempting sub-0.6V outputs causes the converter to saturate and lose control.
Does MP2109DQ-LF-P support forced PWM mode or automatic PFM/PWM transition?
No-it operates exclusively in fixed-frequency current-mode PWM. There is no PFM mode or frequency modulation; the 1.2MHz oscillator runs continuously during regulation. Light-load efficiency is maintained via low quiescent current (440µA/channel), not variable frequency.
How is short-circuit protection implemented, and does it auto-recover?
Under short-circuit, the MP2109DQ-LF-P reduces switching frequency and lowers current limit to limit power dissipation. Once the short is removed and FB voltage rises above ~0.55V, normal operation resumes automatically-no reset or external intervention is required.
What PCB layout practices are critical for thermal performance?
Maximize copper area connected to the exposed thermal pad (minimum 12mm² recommended), use ≥4 thermal vias (0.3mm diameter) to inner ground planes, keep IN/SW/GND traces wide and short, and avoid placing sensitive FB traces near SW nodes-these practices reduce θJA by up to 15°C/W in real-world layouts.
MP2109DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 800mA
- Frequency - Switching:
- 1.24MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2109DQ-LF-P FAQ
1.How can I place an order for MP2109DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2109DQ-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 MP2109DQ-LF-P reliable?
The price and inventory of MP2109DQ-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 MP2109DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2109DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2109DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2109DQ-LF-P?
MP2109DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2109DQ-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 MP2109DQ-LF-P?
For technical support, including MP2109DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2109DQ-LF-P requirements.
6.How does Aetrix verify that MP2109DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2109DQ-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 MP2109DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2109DQ-LF-P?
All MP2109DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2109DQ-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 MP2109DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2109DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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