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Monolithic Power Systems Inc. MP2108DK-LF
- Part No.:
- MP2108DK-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP2108DK-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,525
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Product details
Overview
MP2108DK-LF from Monolithic Power Systems is a 2A, 740kHz synchronous buck converter in MSOP-10 package, designed for low-voltage DC/DC conversion in space-constrained portable electronics. It integrates 160mΩ high-side and 190mΩ low-side N-MOSFETs, supports 2.6V–6V input, delivers 0.9V–5V output, and achieves >95% efficiency at 2.5V/2A with VIN=5V.
For engineers reviewing the MP2108DK-LF datasheet, MP2108DK-LF pinout, MP2108DK-LF application, or MP2108DK-LF equivalent, this device is selected for compact, high-efficiency point-of-load regulation where thermal performance, soft-start control, and cycle-by-cycle current limiting are critical design requirements.
Technical Context
The MP2108DK-LF implements fixed-frequency current-mode control with a 740kHz oscillator, enabling fast transient response and stable loop compensation via the COMP pin. Its internal 2.4V LDO powers bias circuitry, while BST bootstrap operation sustains high-side gate drive during continuous conduction.
It features integrated UVLO (2.2V threshold with 100mV hysteresis), thermal shutdown at 160°C, and dual current limiting-2.5A source (high-side) and 350mA sink (low-side)-ensuring robust protection under overload and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports full-load operation in handheld and mini-PCI applications without external heatsinking. |
| Input Voltage Range | 2.6V to 6V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and dual-cell alkaline/nickel-based supplies. |
| Switching Frequency | 740kHz (typ.) - enables use of small 5µH inductors and 10–22µF ceramic output capacitors, minimizing solution footprint. |
| Feedback Reference | 0.9V ±20mV - sets output voltage via external resistor divider; allows precise 1.2V, 1.8V, 2.5V, or 3.3V regulation with <±1% error over temperature. |
| Efficiency | >95% at VOUT=2.5V, IOUT=2A, VIN=5V - reduces power loss and thermal stress in battery-powered devices with limited airflow. |
| Soft-Start Current | 2µA - charges external SS capacitor linearly to control startup inrush; 4–10ms ramp time achievable with 10–22nF capacitor. |
| Thermal Resistance θJA | 150°C/W (MSOP-10) - requires careful PCB copper area design to maintain junction temperature ≤125°C at full load. |
Pinout & Package
MP2108DK-LF uses a RoHS-compliant, lead-free MSOP-10 package (3mm × 4.9mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap Supply | Drives high-side MOSFET gate above VIN; requires ≥10nF capacitor to LX to sustain gate voltage during high-duty cycles. |
| 2 VIN | Main Power Input | Supplies internal LDO (2.4V) and power switches; must be bypassed with ≥10µF ceramic capacitor to PGND near the pin. |
| 3 LX | Switch Node | Connects to inductor and output LC filter; carries high di/dt switching current - layout loop area must be minimized. |
| 4 PGND | Power Ground | Source terminal of low-side MOSFET; must be tied to SGND at single point near IC to avoid noise coupling into feedback path. |
| 5 SGND | Signal Ground | Reference for FB, COMP, SS, RUN, VREF; isolated from PGND except at one star point to prevent ground bounce. |
| 6 SS | Soft-Start Control | Accepts 2µA current source to ramp FB threshold; determines startup slew rate and limits input inrush current. |
| 7 FB | Feedback Input | Inverting input of error amplifier; compares divided output voltage against 0.9V reference to regulate VOUT. |
| 8 COMP | Compensation Node | Error amplifier output; connects to RC network to set pole-zero locations and ensure stable loop gain margin ≥45°. |
| 9 VREF | Internal Regulator Output | 2.4V LDO output; bypassed with ≥10nF capacitor to SGND - no external load permitted. |
| 10 RUN | Enable/Shutdown Control | Logic-level input: <0.4V disables IC (IQ = 0.5µA), >1.5V enables operation; 100kΩ pull-up to VIN enables auto-start. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 160mΩ high-side + 190mΩ low-side N-MOSFETs eliminate external Schottky loss and improve light-load efficiency. |
| Cycle-by-cycle current limit | 2.5A source / 350mA sink thresholds protect against short-circuit and overcurrent without latch-off, supporting hiccup mode recovery. |
| Internal 2.4V LDO | Powers internal logic and gate drivers from VIN; eliminates need for external bias supply and simplifies system power architecture. |
| Thermal shutdown | 160°C junction trip point with hysteresis ensures safe operation under sustained overload or poor PCB thermal design. |
| UVLO with hysteresis | 2.2V turn-on threshold with 100mV hysteresis prevents oscillation during brown-out conditions and ensures clean startup. |
Applications
| Cell Phones | Digital Still Cameras |
|---|---|
|
Use Scenario: Powering image sensor and baseband processor core rails (1.2V, 1.8V) from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated, low-noise DC supply with fast load transient response. Use Value: Enables compact camera module design with <10mm² solution size and >94% efficiency at 1.2V/1.5A, extending battery life. |
Use Scenario: Supplying CCD/CMOS sensor analog and digital domains (2.5V, 3.3V) in DSLR or mirrorless bodies. IC Role / Device Role / Timing Role: High-efficiency, low-ripple POL converter synchronized to imaging pipeline timing for noise-sensitive analog circuits. Use Value: Delivers <15mVpp output ripple with 22µF ceramic output cap, preventing sensor banding and improving SNR. |
| SOHO Routers | Handheld Computers |
|
Use Scenario: Generating 3.3V/2A for Ethernet PHY and 1.8V/1.2A for SoC I/O rails on compact router PCBs. IC Role / Device Role / Timing Role: Dual-rail buck controller supporting independent enable sequencing and thermal-aware power management. Use Value: Reduces BOM count by eliminating discrete MOSFETs and gate drivers; MSOP-10 footprint fits dense 4-layer router layouts. |
Use Scenario: Regulating 1.2V CPU core and 1.8V memory rails in industrial PDA designs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Automotive-grade qualified (–40°C to +85°C) buck converter with robust UVLO and thermal protection. Use Value: Maintains regulation stability over full temperature range with <±1.5% output voltage drift, ensuring reliable boot and runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2108DQ-LF | Same die, QFN-10 (3mm × 3mm) package with θJA = 50°C/W - 3× better thermal performance than MSOP-10. | Preferred for >1.5A continuous loads or ambient temperatures >60°C where MSOP-10 exceeds thermal limits. | Select DQ-LF when board space permits smaller footprint and higher thermal headroom is required. |
| TPS62231DRVR | TI part: 3MHz switching, 0.6V ref, 2A, but only 2.05–6.5V input and no BST pin - requires external bootstrap diode for high-VIN operation. | Better suited for ultra-thin devices needing minimal inductor height; less suitable for 2.6V–3.3V input where MP2108's UVLO and low-VIN capability excel. | Choose TPS62231DRVR only if 3MHz operation and smallest possible inductor size are mandatory; otherwise MP2108DK-LF offers broader input range and simpler layout. |
Compared with MP2108DQ-LF, the DK-LF offers identical electrical performance but higher thermal resistance - making it optimal for cost-sensitive, lower-current (<1.5A) designs where MSOP-10 placement is preferred. Versus TPS62231DRVR, MP2108DK-LF provides superior low-input-voltage support, integrated BST drive, and proven ruggedness in portable power applications.
Availability
MP2108DK-LF is available at Aetrix Electronics and suitable for SOHO routers, handheld computers, and digital still cameras requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2108DK-LF 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, headquartered in Kirkland, WA, with global design and support operations.
The MP2108 belongs to MPS's mainstream synchronous buck converter product line, engineered specifically for space-constrained, battery-powered portable electronics demanding high efficiency, low quiescent current, and robust protection features.
FAQ
What is the minimum input voltage required for MP2108DK-LF to start switching?
The MP2108DK-LF has an undervoltage lockout (UVLO) threshold of 2.2V with 100mV hysteresis. It begins switching only when VIN rises above 2.2V and remains enabled until VIN drops below 2.1V. This ensures reliable startup from partially discharged Li-ion cells down to ~2.8V open-circuit voltage.
Can MP2108DK-LF operate with a 1.2V output at 2A from a 3.3V input?
Yes. With VIN = 3.3V and VOUT = 1.2V, the duty cycle is ~36%, well within the 85% maximum. The device maintains >92% efficiency at this condition per typical curves, and the 2.5A source current limit provides 25% headroom for peak transients.
Is an external bootstrap diode required for MP2108DK-LF?
No - the MP2108DK-LF uses internal charge-pump-assisted bootstrap circuitry. An external diode (e.g., IN4148) is optional and recommended only when VOUT ≥ 3.3V and duty cycle >65% (e.g., VIN = 5V → VOUT = 3.3V), to improve high-side gate drive margin and efficiency by ~0.5–1.0%.
How is output voltage accuracy affected by resistor tolerance in the FB divider?
Output voltage error is directly proportional to resistor tolerance. Using 1% R1 and R2 yields ±1.2% total VOUT error (including 0.9V ref tolerance). For 1.2V output with R1 = 10kΩ, R2 = 3.4kΩ, a 1% mismatch adds ±12mV; precision applications should use 0.5% or better resistors.
What is the recommended PCB layout practice for PGND and SGND connections?
PGND and SGND must connect at a single point adjacent to the MP2108DK-LF's exposed pad or Pin 4 (PGND), forming a star ground. PGND carries high di/dt currents and must route directly to input/output capacitors; SGND traces for FB, COMP, and SS must remain short, shielded from noisy SW/LX nodes.
Does MP2108DK-LF support forced PWM or power-save mode operation?
No - the MP2108DK-LF operates exclusively in fixed-frequency PWM mode. It does not include pulse-skipping or burst-mode functionality. Light-load efficiency is maintained via low quiescent current (1.2mA typ.) and synchronous rectification, not variable frequency modulation.
What is the maximum allowable ESR for the output capacitor to ensure loop stability?
Stability depends on compensation network selection, not ESR alone. For ceramic outputs (ESR <10mΩ), Table 1 recommends C3/C4 values without ESR zero compensation. If using tantalum caps (e.g., 300mΩ ESR), C4 must be added - its value is calculated as C4 = R3 × RESR(max), e.g., 18kΩ × 300mΩ = 5.4nF.
MP2108DK-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MP2108DK-LF FAQ
1.How can I place an order for MP2108DK-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2108DK-LF 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 MP2108DK-LF reliable?
The price and inventory of MP2108DK-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2108DK-LF is usually 5 days.
3.What payment methods are accepted for MP2108DK-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2108DK-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2108DK-LF?
MP2108DK-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2108DK-LF 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 MP2108DK-LF?
For technical support, including MP2108DK-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2108DK-LF requirements.
6.How does Aetrix verify that MP2108DK-LF is sourced from the original manufacturer or authorized distributors?
All MP2108DK-LF 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 MP2108DK-LF meets industry standards.
7.What is the process for return or replacement of MP2108DK-LF?
All MP2108DK-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2108DK-LF, 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 MP2108DK-LF part is unused and in its original packaging.
Return procedure for MP2108DK-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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