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Monolithic Power Systems Inc. MP2108DQ-LF-Z
- Part No.:
- MP2108DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2108DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
MP2108DQ-LF-Z from Monolithic Power Systems is a 2A, 740kHz synchronous buck converter in a 3mm × 3mm QFN-10 package, designed for space-constrained low-voltage DC/DC conversion. It integrates 160mΩ (low-side) and 190mΩ (high-side) MOSFETs, supports 2.6V–6V input, delivers 0.9V–5V output, and achieves >95% efficiency at 2A load - used in handheld computing and digital camera power rails.
For engineers reviewing the MP2108DQ-LF-Z datasheet, MP2108DQ-LF-Z pinout, MP2108DQ-LF-Z application, or MP2108DQ-LF-Z equivalent, key selection criteria include thermal performance in QFN packaging, internal current-mode control loop stability, soft-start timing via SS pin, and bootstrap capacitor requirements for high-duty-cycle operation.
Technical Context
The MP2108DQ-LF-Z implements fixed-frequency current-mode control with a 740kHz oscillator, enabling precise duty-cycle regulation and fast transient response. Its integrated high- and low-side N-channel MOSFETs eliminate external switch losses and reduce BOM count.
It features cycle-by-cycle overcurrent protection (2.5A source / 350mA sink), thermal shutdown at 160°C, under-voltage lockout (2.2V threshold with 100mV hysteresis), and an internal 2.4V VREF regulator bypassed by a 10nF capacitor to SGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 6V - supports single-cell Li-ion, USB-powered, and 3.3V/5V rail inputs without external regulators. |
| Output Current | 2A continuous - sufficient for core logic or display bias in portable devices; QFN package recommended above 1.5A. |
| Switching Frequency | 740kHz (typ.) - enables compact LC filter design with ≤5µH inductors and ≤22µF ceramic output capacitors. |
| Feedback Reference Voltage | 0.9V ±20mV - sets output voltage via external resistor divider; stable across –40°C to +85°C. |
| Internal MOSFET RDS(on) | High-side: 190mΩ @ 5V VIN; Low-side: 160mΩ @ 5V VIN - minimizes conduction loss and eliminates need for external sync rectifier. |
| Soft-Start Current | 2μA - charges external SS capacitor linearly to control output ramp rate and limit inrush current during startup. |
| Thermal Resistance θJA | 50°C/W - QFN-10 package provides 3× better thermal performance than MSOP-10 (150°C/W), critical for sustained 2A operation. |
Pinout & Package
MP2108DQ-LF-Z uses a RoHS-compliant, thermally enhanced 3mm × 3mm QFN-10 package with exposed pad (PGND-connected) on the underside for improved heat dissipation. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply node | Drives high-side MOSFET gate; requires ≥10nF capacitor to LX to sustain gate voltage during high-duty-cycle operation. |
| VIN (Pin 2) | Main power input | Supplies internal LDO (2.4V VREF) and gate drivers; must be bypassed with ≥10µF ceramic capacitor to PGND. |
| LX (Pin 3) | Switch node | Connects to inductor and output filter; carries high di/dt switching current - layout critical for EMI and efficiency. |
| PGND (Pin 4) | Power ground | Source terminal of low-side MOSFET; must be tied to SGND near IC to minimize ground bounce and current-sense error. |
| SGND (Pin 5) | Signal ground | Reference for FB, COMP, SS, RUN, VREF; isolated from PGND except at single-point connection near IC. |
| SS (Pin 6) | Soft-start control | 2μA current source ramps voltage to limit startup inrush; defines linear output voltage ramp time (e.g., 4–10ms with 10–22nF). |
| FB (Pin 7) | Feedback input | Inverting input of error amplifier; compares divided output voltage to 0.9V reference to regulate output. |
| COMP (Pin 8) | Compensation node | Error amplifier output; connects to RC network to stabilize current-mode control loop (pole-zero placement per Table 1). |
| VREF (Pin 9) | Internal regulator output | 2.4V reference for internal circuitry; must be bypassed with ≥10nF capacitor to SGND - no external load permitted. |
| RUN (Pin 10) | Enable control | Logic-level input: <0.4V disables device (0.5μA shutdown current); >1.5V enables (1.2–1.8mA operating current). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 160mΩ low-side MOSFET eliminates external Schottky diode, reducing conduction loss and improving light-load efficiency. |
| Current-mode control | Internal transconductance error amplifier (450μA/V) and current-sense comparator enable fast load transient response and inherent cycle-by-cycle current limiting. |
| Thermal shutdown | 160°C junction temperature cutoff with hysteresis prevents permanent damage during overload or poor PCB heatsinking. |
| Under-voltage lockout | 2.2V activation threshold with 100mV hysteresis ensures clean startup only when input rail is stable and sufficient for regulation. |
| Small solution size | QFN-10 footprint (3mm × 3mm) plus minimal external components (1 inductor, 2–3 capacitors, 2 resistors) fits sub-100mm² PCB area. |
Applications
| Handheld Computing Power | Digital Camera Core Rail |
|---|---|
Use Scenario: Powering ARM Cortex-A/M cores and DDR memory in PDAs and ultra-portable tablets with battery input. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8V at up to 2A with tight output tolerance and fast transient recovery. Use Value: Internal MOSFETs and 740kHz switching enable compact, high-efficiency power stage without external gate drivers or sync diodes. |
Use Scenario: Supplying image sensor and ISP processing blocks in digital still/video cameras powered from single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency buck converter generating 2.5V/3.3V from 3.3V–4.2V battery range with low-noise output for analog sensor circuits. Use Value: 0.9V feedback reference and precision error amplifier ensure ±1% output regulation critical for sensor ADC accuracy. |
| SOHO Router CPU Core | Mini-PCI Express Module |
Use Scenario: Providing 1.0V–1.2V core voltage to MIPS/ARM-based networking SoCs in compact broadband routers. IC Role / Device Role / Timing Role: Main DC/DC converter with soft-start and UVLO to prevent brown-out during hot-plug or battery switchover events. Use Value: SS pin programmability allows controlled power-up sequencing aligned with SoC reset timing requirements. |
Use Scenario: Generating 3.3V auxiliary rail for PCIe endpoint logic and interface buffers in embedded expansion cards. IC Role / Device Role / Timing Role: Secondary regulator supporting hot-plug detection and low-power standby modes via RUN pin control. Use Value: RUN pin logic-level enable/disable capability supports dynamic power gating and system-level energy management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT6220AGQW | 3A rated, 2MHz switching, 2.5V–5.5V input, 0.6V reference, QFN-10 package | Higher current and frequency suit denser layouts but require tighter layout control and smaller LC components | Select when >2A load or faster transient response is required; verify compensation stability with higher fSW. |
| TPS62231DRVR | 2A rated, 3.5MHz switching, 2.05V–6V input, 0.6V reference, WSON-6 package | Smaller 2mm × 2mm package and higher fSW reduce solution size but increase sensitivity to PCB parasitics | Prefer for ultra-compact designs where thermal margin allows; avoid if >1.5A continuous load due to smaller thermal pad. |
Compared with RT6220AGQW and TPS62231DRVR, MP2108DQ-LF-Z offers superior thermal performance in its QFN-10 package (50°C/W vs. ~65–80°C/W), lower quiescent current in shutdown (0.5μA), and proven robustness in 740kHz industrial-grade applications - making it optimal for cost-sensitive, thermally constrained 2A systems.
Availability
MP2108DQ-LF-Z is available at Aetrix Electronics and suitable for handheld computing, digital imaging, SOHO networking, and Mini-PCI embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2108DQ-LF-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP2108 belongs to MPS's high-efficiency DC/DC converter product line, engineered specifically for portable and space-constrained applications demanding minimal external components, low quiescent current, and robust thermal behavior in small packages.
FAQ
What is the maximum recommended output current for MP2108DQ-LF-Z in continuous operation?
The MP2108DQ-LF-Z is rated for 2A continuous output current under typical conditions (TA = +25°C, 2-layer PCB with 1 oz copper). Derating is required above +60°C ambient; full 2A load is sustainable up to +85°C junction temperature when using the QFN-10 package with proper thermal vias and copper pour.
Can MP2108DQ-LF-Z operate with a 2.5V input supply?
No - the absolute minimum input voltage is 2.6V per datasheet specifications. At 2.5V, the internal UVLO (2.2V threshold) may allow startup, but regulation cannot be maintained due to insufficient headroom for the internal LDO and gate drive circuitry; output will drop out or become unstable.
Is an external bootstrap diode required for MP2108DQ-LF-Z?
An external bootstrap diode (e.g., IN4148) is optional and recommended only when VOUT ≥ 3.3V and duty cycle exceeds 65% (i.e., VOUT/VIN > 0.65). It improves high-side gate drive efficiency by reducing BST capacitor discharge, especially in high-VOUT/low-VIN scenarios.
How is output voltage set on MP2108DQ-LF-Z?
Output voltage is set using a resistive divider from VOUT to FB, referenced to the internal 0.9V feedback threshold. With R1 = 10kΩ (to SGND), R2 = 10kΩ × ((VOUT/0.9V) − 1). For example, 2.5V output requires R2 ≈ 17.8kΩ. Divider current should be 100× greater than FB input bias (±100nA).
What is the purpose of the exposed thermal pad on the QFN-10 package?
The exposed pad on the MP2108DQ-LF-Z QFN-10 package is electrically connected to PGND and serves as the primary thermal path to the PCB. It must be soldered to a dedicated PGND copper area with ≥4 thermal vias (0.3mm diameter) to an inner ground plane to achieve the specified θJA = 50°C/W and prevent thermal shutdown at full load.
Does MP2108DQ-LF-Z support forced PWM or power-save mode?
No - MP2108DQ-LF-Z operates exclusively in fixed-frequency PWM mode. It does not feature automatic pulse-skipping or discontinuous conduction mode (DCM) at light loads. Efficiency at light loads is maintained via low quiescent current (1.2–1.8mA) and synchronous rectification, not mode switching.
What is the minimum recommended soft-start capacitor value for MP2108DQ-LF-Z?
The minimum recommended soft-start capacitor is 10nF, placed between SS and SGND. This yields ~4.5ms soft-start time. Values below 10nF risk excessive inrush current; values above 22nF extend startup unnecessarily. Ceramic C0G/NP0 types are preferred for temperature stability and low leakage.
MP2108DQ-LF-Z 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:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 2A
- Frequency - Switching:
- 740kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2108DQ-LF-Z FAQ
1.How can I place an order for MP2108DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2108DQ-LF-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 MP2108DQ-LF-Z reliable?
The price and inventory of MP2108DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2108DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2108DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2108DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2108DQ-LF-Z?
MP2108DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2108DQ-LF-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 MP2108DQ-LF-Z?
For technical support, including MP2108DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2108DQ-LF-Z requirements.
6.How does Aetrix verify that MP2108DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2108DQ-LF-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 MP2108DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2108DQ-LF-Z?
All MP2108DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2108DQ-LF-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 MP2108DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2108DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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