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Monolithic Power Systems Inc. MP2115DQ-LF-P
- Part No.:
- MP2115DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2115DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
MP2115DQ-LF-P 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-P datasheet, MP2115DQ-LF-P pinout, MP2115DQ-LF-P application, or MP2115DQ-LF-P 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-P implements constant-frequency current-mode PWM control with slope compensation for stable operation above 50% duty cycle and cycle-by-cycle peak current limiting. Its functional block integrates bias/reference, error amplifier, PWM comparator, oscillator, and dual MOSFET drivers for PFET/NFET power stage.
It supports 100% duty-cycle dropout operation, programmable input current limit (via external resistor to ILIM), and independent load switch functionality on VSYS pin - enabling simultaneous regulation and energy reservoir management for USB-supplied systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 6V - supports direct USB 5V and single-cell Li-ion (3.0V–4.2V) inputs without pre-regulation. |
| Output Current | 2A continuous - sufficient for core supplies of microprocessors, DSPs, and camera modules. |
| Feedback Reference | 0.607V ±12mV - enables precise output voltage setting down to 0.6V using standard resistor dividers. |
| Switching Frequency | 0.7MHz to 2MHz - selectable via resistor on FREQ pin; higher frequencies allow smaller inductors and capacitors. |
| Input Current Limit | Programmable up to 500mA (RILIM = 25kΩ) - protects USB ports from overcurrent during startup or fault conditions. |
| Shutdown Current | <1µA - ensures minimal battery drain in standby mode for portable equipment. |
| Thermal Shutdown | 145°C trip point - internal protection prevents permanent damage under sustained overload or poor heatsinking. |
Pinout & Package
MP2115DQ-LF-P 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input Supply | Main input rail connection for power stage; requires local ceramic decoupling (e.g., 10µF X5R). |
| 2 ILIM | Input Current Limit Set | Analog input that sets average input current limit via external resistor to GND; enables USB-compliant current limiting. |
| 3 FB | Feedback Sense Input | High-impedance node monitoring output voltage divider; regulates VOUT to 0.607V reference. |
| 4 AGND | Analog Ground Reference | Separate ground return for feedback and bias circuitry to minimize noise coupling into regulation loop. |
| 5 FREQ | Frequency Programming Input | Resistor-to-GND sets oscillator frequency between 0.7MHz and 2MHz; determines size/cost trade-off of magnetics. |
| 6 PGND | Power Ground / Exposed Pad | Low-impedance ground return for power switches; exposed pad must be soldered to PCB ground plane for thermal performance. |
| 7 SW | Switch Node Output | Drain connection of internal PFET/NFET; drives external inductor; high dv/dt node requiring careful layout. |
| 8 VSYS | Load Switch Output | Provides regulated system rail with energy reservoir capability; supports peak currents up to 2A for burst-mode loads. |
| 9 EN | Enable Control Input | Logic-level input (1.65V–2V high) enabling/disabling regulator; <0.1µA shutdown current when pulled low. |
| 10 PG | Power Good Indicator | Open-drain output asserting high when VFB ≥ 80% of 0.6V; requires external pull-up for system sequencing or fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates need for external Schottky diode, improving efficiency by ~5–8% vs. asynchronous designs at 2A load. |
| Programmable Input Current Limit | Configurable via single resistor to ILIM pin - ensures compliance with USB 2.0 500mA port limits without external sense circuitry. |
| Power Good (PG) Output | Monitors regulated output voltage and signals valid regulation status to host controller or PMIC for safe power sequencing. |
| Short-Circuit Protection | Reduces switching frequency and lowers PFET current limit during output short, limiting fault energy and enabling auto-recovery. |
| Thermal Fault Protection | Internal sensor triggers shutdown at 145°C junction temperature and resumes operation after cooldown - no latch required. |
Applications
| USB-Powered Portable Devices | Smartphone Core Voltage Regulation |
|---|---|
|
Use Scenario: Powering handheld instruments and accessories directly from USB 5V ports with strict current budgeting. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3V/3.8V rails while enforcing ≤500mA input draw. Use Value: Enables full USB compliance without external current-sense amplifiers or discrete load switches. |
Use Scenario: Delivering clean, low-noise 1.2V–1.8V core supply to application processors in smartphones. IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter with fast transient response for CPU DVFS transitions. Use Value: Achieves >90% efficiency at 1.5A load with 1.5MHz switching, minimizing board area and thermal footprint. |
| Digital Camera Power Management | Portable Audio Device Supply |
|
Use Scenario: Supporting burst-mode imaging loads (e.g., flash LED, image sensor readout) requiring 2A peak current. IC Role / Device Role / Timing Role: Regulator + integrated VSYS energy reservoir managing dynamic load transients without large bulk capacitance. Use Value: VSYS pin delivers instantaneous current surges while main regulator maintains steady-state output, reducing voltage droop. |
Use Scenario: Powering audio codecs and DACs in MP3 players where low quiescent current extends battery life. IC Role / Device Role / Timing Role: Efficient 3.3V supply with <1µA shutdown current and soft-start to prevent pop-noise during enable. Use Value: Soft-start time of 100µs eliminates inrush-induced audio artifacts during playback startup. |
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 |
|---|---|---|---|
| TPS62231DRVR | Fixed 3.3V output, 3MHz switching, no ILIM pin - lacks programmable input current limit and adjustable VOUT. | Suitable only for fixed-voltage, high-frequency applications where USB current limiting is handled externally. | Select if board space is critical and output voltage is fixed; avoid if USB port current compliance or VOUT adjustability is required. |
| RT8059GJ6 | 2A rating, 2.5V–5.5V input, but uses external diode (asynchronous), no PG output, and no ILIM function. | Lower cost but reduced efficiency (~85% vs. 92%) and missing fault signaling needed for robust USB systems. | Acceptable for non-USB battery-powered devices with relaxed efficiency and protection requirements. |
Compared with TPS62231DRVR and RT8059GJ6, MP2115DQ-LF-P uniquely combines programmable input current limiting, adjustable output voltage, power-good signaling, and synchronous rectification in a 3mm × 3mm QFN - making it optimal for USB-hosted portable electronics requiring both compliance and flexibility.
Availability
MP2115DQ-LF-P is available at Aetrix Electronics and suitable for USB-powered portable devices, smartphone core supplies, digital camera power rails, and portable audio equipment requiring stable component supply and RoHS-compliant packaging.
Supply support for MP2115DQ-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 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 compact, efficient, and standards-compliant power conversion from USB or single-cell Li-ion sources.
FAQ
What is the minimum output voltage supported by MP2115DQ-LF-P?
The MP2115DQ-LF-P supports output voltages as low as 0.6V, set by the internal 0.607V feedback reference and an external resistor divider. This enables direct powering of modern low-voltage microprocessor cores and I/O rails without additional LDO stages.
How is the input current limit programmed on MP2115DQ-LF-P?
The input current limit is set by connecting a resistor between the ILIM pin and AGND. For example, a 25kΩ resistor configures a 500mA limit per Table 1 in the datasheet. The relationship is linear and calibrated for USB 5V input with typical output conditions.
Does MP2115DQ-LF-P require external compensation components?
No external compensation is required - the MP2115DQ-LF-P uses internal Type-II compensation with a 17pF capacitor and 1MΩ resistor. Stability is ensured across the full operating range when using recommended inductor and output capacitor values per the datasheet.
What is the purpose of the VSYS pin?
The VSYS pin serves as a dedicated load-switch output that provides a buffered, low-impedance path for peak current delivery (up to 2A), decoupling transient demands from the main regulator output. It connects to a large tantalum or polymer capacitor bank for burst-mode loads like camera sensors.
Can MP2115DQ-LF-P operate in 100% duty cycle mode?
Yes - the MP2115DQ-LF-P supports 100% duty cycle operation during dropout conditions (e.g., VIN ≈ VOUT). In this mode, the PFET remains continuously on, delivering current through its RDS(on) (0.1Ω typical), enabling regulation down to input voltages as low as 2.8V.
Is the PG (Power Good) signal active-high or open-drain?
The PG pin is an open-drain output. It pulls low when FB voltage falls below 80% of 0.6V (i.e., <0.48V); otherwise, it remains high-impedance. An external pull-up resistor (typically 10–100kΩ to VSYS or system rail) is mandatory for proper logic-level signaling.
What thermal derating applies to MP2115DQ-LF-P at elevated ambient temperatures?
With θJA = 50°C/W on a 4-layer PCB, the maximum continuous power dissipation drops linearly from 2.5W at +25°C to zero at +150°C ambient. At +85°C ambient, max allowable power is ~1.3W - corresponding to ~1.5A at 3.3V output with 5V input.
MP2115DQ-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:
- 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-P FAQ
1.How can I place an order for MP2115DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2115DQ-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 MP2115DQ-LF-P reliable?
The price and inventory of MP2115DQ-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 MP2115DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2115DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2115DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2115DQ-LF-P?
MP2115DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2115DQ-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 MP2115DQ-LF-P?
For technical support, including MP2115DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2115DQ-LF-P requirements.
6.How does Aetrix verify that MP2115DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2115DQ-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 MP2115DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2115DQ-LF-P?
All MP2115DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2115DQ-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 MP2115DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2115DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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