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Monolithic Power Systems Inc. MP2108DK-LF-Z
- Part No.:
- MP2108DK-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP2108DK-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
MP2108DK-LF-Z 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 (low-side) and 190mΩ (high-side) MOSFETs, supports 2.6V–6V input, delivers 0.9V–5V output, and achieves >95% efficiency at full load.
For engineers reviewing the MP2108DK-LF-Z datasheet, MP2108DK-LF-Z pinout, MP2108DK-LF-Z application, or MP2108DK-LF-Z equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and current-limiting behavior, and real-world design constraints for handheld, imaging, and embedded power rail generation.
Technical Context
The MP2108DK-LF-Z implements fixed-frequency current-mode control with internal transconductance error amplifier (450μA/V), 740kHz oscillator (±180kHz tolerance), and cycle-by-cycle peak current limiting. Its 0.9V feedback reference enables precise output regulation via external resistor divider.
It features integrated bootstrap gate drive for the high-side N-MOSFET, requiring only a 10nF BST-to-LX capacitor, and includes soft-start via 2μA current source charging an external SS capacitor - enabling controlled ramp-up of output voltage to limit inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports compact 5V-to-1.2V/2.5V/3.3V rails in handheld devices without external current sensing. |
| Input Voltage Range | 2.6V to 6V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and dual-cell alkaline inputs. |
| Switching Frequency | 740kHz typical - enables use of small 5μH inductors and 10–22μF ceramic output capacitors, minimizing solution footprint. |
| Feedback Reference | 0.9V ±20mV - sets output voltage accuracy; combined with 10kΩ R1, allows precise VOUT selection (e.g., 2.5V requires R2 = 17.8kΩ). |
| Thermal Shutdown | 160°C - protects against sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| UVLO Threshold | 2.2V with 100mV hysteresis - prevents erratic startup during brown-out conditions and ensures clean enable sequencing. |
| Efficiency | >95% at 2.5V/1A, VIN=5V - reduces thermal load in sealed enclosures and extends battery runtime in portable systems. |
Pinout & Package
MP2108DK-LF-Z uses a 10-pin MSOP package (3mm × 4.9mm, 0.5mm pitch) with exposed pad for thermal dissipation (θJA = 150°C/W). Pin numbering follows standard MSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives high-side MOSFET gate; requires ≥10nF capacitor to LX to sustain gate voltage during high-duty-cycle operation. |
| VIN | Main Power Input | Supplies internal LDO (2.4V VREF) and power switches; must be bypassed with ≥10μF ceramic capacitor to PGND. |
| LX | Switch Node | Connects to inductor and output filter; carries high di/dt switching current - critical for EMI and layout integrity. |
| PGND | Power Ground | Source terminal of low-side MOSFET; must be tied to SGND near IC to minimize ground bounce and current-sense error. |
| SGND | Signal Ground | Reference for FB, COMP, SS, RUN, VREF; isolated from PGND except at single-point star connection. |
| SS | Soft-Start Control | Charged by 2μA internal current source; sets linear output ramp time (e.g., 10nF → ~4.5ms soft-start period). |
| FB | Feedback Input | Inverting input of error amplifier; compares divided output voltage to 0.9V reference to regulate VOUT. |
| COMP | Compensation Node | Error amplifier output; connects to RC network (e.g., 9.1kΩ + 2.2nF) to stabilize control loop across load/transient conditions. |
| VREF | Internal Regulator Output | 2.4V LDO output; bypassed with ≥10nF capacitor to SGND - no external load permitted. |
| RUN | Enable/Shutdown | Logic-level control: <0.4V disables IC (0.5μA quiescent); >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 board area. |
| Internal power switches | 190mΩ high-side + 160mΩ low-side MOSFETs enable complete 2A buck solution with only 6 external components (inductor, input/output caps, BST cap, feedback resistors). |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting - prevents inductor saturation and overcurrent damage under short-circuit. |
| Thermal shutdown + UVLO | Robust protection suite ensures safe operation during input brown-out, ambient overheating, or PCB thermal misdesign. |
| Soft-start with programmable ramp | 2μA SS current source allows precise control of startup dV/dt - prevents input capacitor stress and system reset during power-on. |
Applications
| Handheld Computing Power | Digital Camera Core Rail |
|---|---|
Use Scenario: Powering ARM-based application processors and DDR memory in PDAs and early smartphones with single-cell Li-ion input. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V core voltage regulator delivering stable 2A output with tight load-transient response. Use Value: Enables compact, fanless design with >95% efficiency at 1A–2A loads, extending battery life beyond 4 hours under active use. | Use Scenario: Generating 2.5V and 3.3V rails for CMOS image sensors, ISP processors, and SD card interfaces in digital still/video cameras. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with low-noise output and fast load-step recovery (<100μs settling). Use Value: Reduces thermal noise coupling into analog sensor paths and maintains stable clock domain power during burst capture sequences. |
| SOHO Router CPU Supply | Mini-PCI Interface Module |
Use Scenario: Providing 3.3V/1.8V rails for MIPS or ARM SoCs and Ethernet PHYs in compact broadband routers and access points. IC Role / Device Role / Timing Role: Main DC/DC regulator with integrated switches and UVLO, supporting hot-plug and brown-out resilient operation. Use Value: Eliminates need for external high-side driver or discrete MOSFETs, reducing BOM count and improving supply reliability in thermally dense chassis. | Use Scenario: Delivering regulated 1.2V/1.5V/1.8V power to PCI Express add-in cards in industrial PC-104 or mini-PCI slots. IC Role / Device Role / Timing Role: Compact, low-profile buck converter mounted directly on PCIe module PCB for local power conversion. Use Value: Meets strict height constraints (<1.1mm profile for MSOP-10) while maintaining 2A capability and thermal margin up to +85°C ambient. |
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-Z | Same die, 3mm×3mm QFN-10 package with θJA = 50°C/W - superior thermal performance above 1.5A load. | Required for sustained 2A operation in enclosed or high-ambient environments where MSOP thermal resistance causes derating. | Select DQ variant when board layout allows QFN footprint and thermal pad soldering; DK is preferred for legacy MSOP-compatible designs. |
| TI TPS62231DRVR | 2A, 3MHz fixed-frequency buck; smaller 2mm×2mm WSON package but higher quiescent current (25μA vs 1μA shutdown) and narrower 2.05–6.5V input range. | Better suited for ultra-low-power always-on rails; less ideal for high-current bursts due to lower peak current limit (2.3A vs 3.5A source limit). | Choose TPS62231 for battery-backed standby rails needing sub-30μA IQ; retain MP2108DK-LF-Z for cost-sensitive, high-current, thermally constrained applications. |
Compared with MP2108DK-LF-Z, the DQ variant improves thermal headroom without changing functionality, while the TPS62231 trades higher switching frequency and smaller size for reduced current capability and higher light-load IQ - making MP2108DK-LF-Z optimal for 2A portable power where thermal density and peak current robustness are prioritized.
Availability
MP2108DK-LF-Z is available at Aetrix Electronics and suitable for handheld computing, digital imaging, and SOHO networking applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2108DK-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 mainstream synchronous buck converter product line, engineered for cost-effective, high-efficiency DC/DC conversion in portable and embedded systems with stringent size and thermal constraints.
FAQ
What is the maximum recommended output current for MP2108DK-LF-Z in MSOP-10 package?
The MP2108DK-LF-Z is rated for 2A continuous output current. However, thermal limits require derating above 1.5A in still-air conditions due to MSOP-10's θJA of 150°C/W. For sustained 2A operation, ensure ≥2cm² copper pour under the exposed pad and airflow ≥200LFM.
Can MP2108DK-LF-Z operate with input voltage below 2.6V?
No - the absolute minimum input voltage is 2.6V per datasheet specifications. Below this, UVLO prevents startup, and internal LDO cannot maintain stable 2.4V VREF. Attempting operation at 2.5V may cause erratic regulation or failure to start.
Is an external bootstrap diode required for MP2108DK-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 margin and efficiency under those specific high-VOUT, low-VIN conditions.
What is the purpose of the VREF pin, and can it power external circuitry?
VREF is the 2.4V output of the internal LDO that powers internal bias circuits. It must be bypassed with ≥10nF capacitor to SGND but cannot supply external current - loading VREF will disrupt internal regulation and cause output instability or shutdown.
How does the soft-start function interact with the RUN pin?
Soft-start initiates only after RUN is pulled high (>1.5V). The 2μA current source begins charging the SS capacitor at that moment, linearly ramping the FB threshold from 0V to 0.9V. If RUN is toggled low during soft-start, the SS capacitor discharges and restarts upon next enable.
What compensation components are recommended for 3.3V output with 22μF ceramic output capacitor?
For 3.3V output and 22μF ceramic capacitor, use R3 = 12kΩ, C3 = 1.8nF, and R2 = 27kΩ (with R1 = 10kΩ). This configuration places the control loop crossover at ~33kHz - well below 74kHz (1/10 of 740kHz switching frequency) - ensuring phase margin >45° and stable transient response.
Does MP2108DK-LF-Z support forced PWM or power-save mode?
No - MP2108DK-LF-Z operates exclusively in fixed-frequency PWM mode. It does not include pulse-skipping or discontinuous conduction mode (DCM) for light loads; quiescent current remains ~1.5mA across load range, making it unsuitable for ultra-low-IQ battery applications.
MP2108DK-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
MP2108DK-LF-Z FAQ
1.How can I place an order for MP2108DK-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2108DK-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 MP2108DK-LF-Z reliable?
The price and inventory of MP2108DK-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 MP2108DK-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2108DK-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2108DK-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2108DK-LF-Z?
MP2108DK-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2108DK-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 MP2108DK-LF-Z?
For technical support, including MP2108DK-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2108DK-LF-Z requirements.
6.How does Aetrix verify that MP2108DK-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2108DK-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 MP2108DK-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2108DK-LF-Z?
All MP2108DK-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2108DK-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 MP2108DK-LF-Z part is unused and in its original packaging.
Return procedure for MP2108DK-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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