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Monolithic Power Systems Inc. MP2115DQ-LF-Z
- Part No.:
- MP2115DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2115DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
MP2115DQ-LF-Z from Monolithic Power Systems is a 2A synchronous step-down DC/DC converter with programmable input current limit, integrated main switch and synchronous rectifier, 2.8V–6V input range, 0.6V–6V adjustable output, and 0.7MHz–2MHz programmable switching frequency - used in USB-powered portable devices requiring compact, high-efficiency power conversion.
For engineers reviewing the MP2115DQ-LF-Z datasheet, MP2115DQ-LF-Z pinout, MP2115DQ-LF-Z application, or MP2115DQ-LF-Z equivalent, key selection criteria include input current limit programming via ILIM pin, FREQ resistor-based frequency tuning, PG open-drain power-good signaling, thermal shutdown at 145°C, and QFN10 (3mm × 3mm) package compatibility with space-constrained PCB layouts.
Technical Context
The MP2115DQ-LF-Z implements constant-frequency current-mode PWM control with slope compensation for stable operation up to 50% duty cycle and sub-harmonic oscillation suppression. Its dual-switch architecture integrates a 0.1Ω PFET main switch and 0.1Ω NFET synchronous rectifier, enabling up to 92% efficiency without external diode.
It features independent functional blocks: programmable input current limit (via ILIM pin and external resistor), 0.6V feedback reference with ±1.2% accuracy over temperature, open-drain PG output with 70–80% ramp thresholds, and 100µs soft-start timing - all coordinated through an internal bias and voltage reference circuit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous load capability with thermal foldback above 125°C junction temperature |
| Input Voltage Range | 2.8V to 6V - supports direct USB 5V and single-cell Li-ion battery inputs |
| Output Voltage Range | 0.6V to 6V - set by external resistor divider; 0.6V FB reference enables low-voltage core supplies |
| Switching Frequency | 0.7MHz to 2MHz - programmed via resistor on FREQ pin; higher frequencies reduce inductor size |
| Input Current Limit | Programmable from ~200mA to 2A via resistor on ILIM pin - protects USB ports from overcurrent |
| Shutdown Current | <0.1µA - enables ultra-low-power standby in battery-operated systems |
| Thermal Shutdown | 145°C trip point with hysteresis - prevents permanent damage during sustained overload |
Pinout & Package
MP2115DQ-LF-Z is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to PGND for efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power stage input supply | Connects to 2.8–6V source; requires local 10µF ceramic decoupling |
| 2 ILIM | Input current limit programming | Resistor-to-GND sets average input current threshold; enables USB-compliant current limiting |
| 3 FB | Feedback voltage sensing | Monitors output via resistor divider; regulates VOUT to 0.6V reference with ±1.2% tolerance |
| 4 AGND | Analog ground reference | Separate ground return for feedback and bias circuits to minimize noise coupling |
| 5 FREQ | Switching frequency programming | Resistor-to-GND selects oscillator frequency between 0.7MHz and 2MHz |
| 6 PGND | Power ground terminal | Must be tied to exposed thermal pad and system power ground plane |
| 7 SW | Switch node output | Drain connection of internal PFET/NFET; drives external inductor |
| 8 VSYS | Load switch output / reservoir node | Supplies peak current to USB port; requires ≥3×470µF tantalum capacitors |
| 9 EN | Enable control input | Active-high logic; 1.65–2V threshold enables device; <1.32V disables with <0.1µA quiescent draw |
| 10 PG | Power good indicator | Open-drain output; pulls low when FB < 0.48V (80% of 0.6V); requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and board area |
| Programmable input current limit | Enables compliance with USB 2.0/3.0 port current limits using single external resistor |
| 100% duty-cycle operation | Maintains regulation during dropout (VIN ≈ VOUT); critical for Li-ion battery end-of-discharge |
| Short-circuit protection with frequency foldback | Reduces switching frequency and PFET current limit during fault; auto-recovers after fault removal |
| Thermal fault protection | Internal sensor triggers shutdown at 145°C; resumes operation after cooldown and EN toggle |
Applications
| USB-Powered Portable Devices | Smartphone Core Voltage Regulation |
|---|---|
|
Use Scenario: Powering handheld instruments and accessories directly from USB host ports. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V/3.8V from 5V USB input with programmable 500mA input current limit. Use Value: Prevents USB port overcurrent shutdown while maintaining stable output under dynamic load transients up to 2A peak. |
Use Scenario: Supplying processor I/O or memory interface rails in smartphones with tight thermal constraints. IC Role / Device Role / Timing Role: Synchronous step-down converter generating 1.2V–1.8V core voltages with 0.6V FB reference and fast transient response. Use Value: Achieves >90% efficiency at 1A load, minimizing heat generation in sealed enclosures with limited airflow. |
| Digital Camera Power Management | Portable Audio Device Supplies |
|
Use Scenario: Providing burst-mode power to image sensors and flash controllers during capture sequences. IC Role / Device Role / Timing Role: Regulator with VSYS pin supporting high-peak-current reservoir function; delivers 2A pulses to CMOS sensor array. Use Value: VSYS capacitor bank sustains 2A peak loads without collapsing main rail; PG signal synchronizes sensor initialization. |
Use Scenario: Generating clean, low-noise 3.3V supply for DACs and audio codecs in MP3 players. IC Role / Device Role / Timing Role: Low-ripple buck converter with 2MHz switching and ceramic output capacitors minimizing EMI near sensitive analog stages. Use Value: 100µs soft-start prevents pop/click artifacts; <10mVpp output ripple ensures SNR >95dB in audio path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Fixed 3.3V output; no ILIM pin; 2.05V–6.5V input; 300mA max output | Lacks programmable current limit and 2A capability; suited only for low-power fixed-VOUT use cases | Select only if output voltage is fixed and load current ≤300mA; not suitable for USB current-limited designs |
| RT8059GJ6 | 2A output; 2.5V–5.5V input; no ILIM or FREQ pins; fixed 1.5MHz switching | Missing input current limit and frequency programming - cannot meet USB port compliance or EMI requirements | Choose only when board space permits larger inductor and thermal management compensates for lack of current limiting |
Compared with MP2115DQ-LF-Z, TPS62231DRYT offers lower quiescent current but lacks programmable current limiting and 2A capability, while RT8059GJ6 provides similar current rating but omits critical USB-safety features and frequency flexibility required for noise-sensitive portable designs.
Availability
MP2115DQ-LF-Z is available at Aetrix Electronics and suitable for USB-powered portable devices, smartphone core supplies, digital camera power systems, and portable audio equipment requiring stable component supply across production lifecycles.
Supply support for MP2115DQ-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 MP2115 belongs to MPS's USB-optimized DC/DC converter product line, designed specifically for portable electronics requiring programmable input current limiting, small footprint, and high efficiency across wide input/output ranges.
FAQ
What is the minimum output voltage supported by MP2115DQ-LF-Z?
The MP2115DQ-LF-Z supports output voltages as low as 0.6V, set by the internal feedback reference voltage. This is achieved using an external resistor divider where the FB pin senses the midpoint; the 0.6V threshold enables regulation of low-voltage processor cores and I/O rails commonly found in modern mobile SoCs.
How is input current limit programmed on MP2115DQ-LF-Z?
Input current limit is programmed by connecting a resistor between the ILIM pin and AGND. The value determines average input current threshold - e.g., a 25kΩ resistor sets ~500mA limit. The relationship is specified in Table 1 of the datasheet and accounts for VIN, VOUT, and IOUT conditions to ensure USB port compliance.
Does MP2115DQ-LF-Z require external compensation components?
No external compensation components are required. The MP2115DQ-LF-Z uses internal Type-II compensation with a 17pF capacitor and 1MΩ resistor in the error amplifier loop. Stability is ensured across recommended output capacitor ESR ranges (1–30mΩ) and inductance values (1–10µH), simplifying layout and reducing BOM count.
What happens during short-circuit events?
During output short-circuit, the MP2115DQ-LF-Z reduces switching frequency and lowers PFET current limit to ~1.5A, limiting fault current and power dissipation. The device remains latched in this state until the short is removed and FB voltage recovers above 0.6V, at which point normal operation resumes automatically.
Can MP2115DQ-LF-Z operate with 100% duty cycle?
Yes - the MP2115DQ-LF-Z supports 100% duty cycle operation when VIN approaches VOUT, maintaining regulation down to VIN = VOUT + (IOUT × RDS(on)). This feature is essential for sustaining output during Li-ion battery discharge below 3.3V while powering 3.0V or 3.3V rails.
Is the exposed thermal pad electrically connected?
Yes, the exposed pad is internally connected to PGND and must be soldered to a dedicated PGND copper pour on the PCB. It serves both thermal dissipation and electrical grounding functions; floating or misconnected pads cause thermal shutdown or erratic regulation.
What is the purpose of the VSYS pin?
The VSYS pin provides a dedicated output node for high-peak-current reservoir functionality - separate from the main regulated output. It connects to a bulk capacitor bank (e.g., 3×470µF) that supplies transient currents (up to 2A) to USB peripherals or camera modules without disturbing the main VOUT rail.
MP2115DQ-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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 2A
- Frequency - Switching:
- 700kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2115DQ-LF-Z FAQ
1.How can I place an order for MP2115DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2115DQ-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 MP2115DQ-LF-Z reliable?
The price and inventory of MP2115DQ-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 MP2115DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2115DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2115DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2115DQ-LF-Z?
MP2115DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2115DQ-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 MP2115DQ-LF-Z?
For technical support, including MP2115DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2115DQ-LF-Z requirements.
6.How does Aetrix verify that MP2115DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2115DQ-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 MP2115DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2115DQ-LF-Z?
All MP2115DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2115DQ-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 MP2115DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2115DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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