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Monolithic Power Systems Inc. MP9115DQT-LF-P
- Part No.:
- MP9115DQT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MP9115DQT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2.5A 10TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,576
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Product details
Overview
MP9115DQT-LF-P from Monolithic Power Systems is a fully integrated, internally compensated 1.2MHz synchronous step-down DC/DC converter optimized for single-cell Li+-powered portable devices. It delivers up to 2.5A output current with 0.8V–VIN adjustable output, operates from 2.7V–6V input, supports 100% duty cycle for low-dropout operation, and integrates high-side PFET (0.25Ω RDS(on)) and low-side NFET (0.20Ω RDS(on)) in a 3mm×3mm TQFN-10 package.
For engineers reviewing the MP9115DQT-LF-P datasheet, MP9115DQT-LF-P pinout, MP9115DQT-LF-P application, or MP9115DQT-LF-P equivalent, key selection considerations include its fixed 1.2MHz switching frequency, cycle-by-cycle overcurrent protection, thermal shutdown at 150°C, 1μA shutdown current, and stability with ceramic output capacitors - all critical for space-constrained, battery-powered designs requiring high efficiency and fast transient response.
Technical Context
The MP9115DQT-LF-P implements peak current-mode PWM control with internal slope compensation, enabling stable operation in continuous conduction mode (CCM) across 0–100% duty cycle. Its integrated 0.8V reference error amplifier drives the feedback (FB) pin, and the 1.2MHz oscillator ensures predictable EMI behavior while minimizing external component size.
It features dual input rails (PVIN for power FET, VIN for controller), separate LX switching node pins (pins 3 & 4), and no reverse current flow during pre-bias startup - eliminating output voltage undershoot when powering already-biased rails. Protection includes thermal shutdown (150°C trip, 20°C hysteresis) and short-circuit foldback with reduced switching frequency and current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single-cell Li-ion (2.7V cutoff) and USB-powered systems without external LDO pre-regulation. |
| Output Current | 2.5A continuous - sufficient for core logic or RF subsystems in smartphones and portable instruments. |
| Switching Frequency | 1.2MHz (±200kHz) - enables use of compact 2.2μH inductors and reduces audible noise in consumer applications. |
| Feedback Reference | 0.800V ±24mV - sets output voltage via external resistor divider; enables precise 1.2V, 1.5V, 1.8V, 2.5V, or 3.3V regulation. |
| Shutdown Current | 1μA max - preserves battery life during system sleep modes in always-on portable devices. |
| Thermal Shutdown | 150°C with 20°C hysteresis - prevents permanent damage under sustained overload or poor PCB thermal design. |
| Peak Current Limit | 3.5A to 6A - provides robust short-circuit protection while allowing safe inrush into large output capacitance. |
Pinout & Package
MP9115DQT-LF-P is housed in a thermally enhanced 10-pin TQFN package (3mm × 3mm, 0.75mm height) with exposed thermal pad. The package supports high-power density layouts and requires solder paste stencil design per JEDEC MO-229 VEED-5 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Enable/disable control input | Active-high logic: >1.0V enables regulator; <0.3V disables with 1μA shutdown current. |
| 2 GND | Power and signal ground reference | Primary return path for PVIN, LX, and FB; must be connected to exposed thermal pad for thermal performance. |
| 3,4 LX | Switching node outputs | Parallel connection to inductor; carries high di/dt; requires short, wide copper traces to minimize EMI and losses. |
| 5,7,10 N/C | No-connect terminals | Internally unconnected; must remain floating - no external tie or pull-up/down required. |
| 6 PVIN | Power FET supply rail | Supplies high-side PFET; decoupled separately from VIN to reduce switching noise coupling into control circuitry. |
| 8 VIN | Controller supply rail | Provides bias to internal logic, reference, and oscillator; tolerant of ripple due to independent PVIN path. |
| 9 FB | Feedback voltage sensing input | Monitors resistive divider output; regulates VOUT to 0.8V reference; high-impedance (±50nA bias current). |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout-free regulation down to VIN – (ILOAD × 0.25Ω), critical for Li+ battery end-of-discharge (2.7V → 0.8V). |
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum caps; reduces board area and improves reliability in portable designs. |
| No reverse current during pre-bias start-up | Prevents output voltage collapse when powering rails already biased by other sources - essential for multi-rail SoC systems. |
| Cycle-by-cycle overcurrent protection | Limiting occurs every switching cycle, preventing inductor saturation and MOSFET failure during load transients or shorts. |
| Thermal shutdown with hysteresis | Shuts down at 150°C and re-enables only after die cools to 130°C, avoiding oscillatory shutdown/restart under marginal thermal conditions. |
Applications
| Smartphone Core Power | Digital Camera Image Sensor Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series application processors requiring tightly regulated 1.2V core voltage from a 3.6V nominal Li+ battery. IC Role / Device Role / Timing Role: Primary buck converter delivering 2.5A continuous current with <10mV load regulation and <20mV line regulation across battery discharge curve. Use Value: 91% peak efficiency at 1.2V/2.5A enables longer video recording time and lower thermal stress on PCB near processor die. |
Use Scenario: Supplying 2.8V to CMOS image sensors in compact digital cameras with strict EMI limits and rapid wake/sleep transitions. IC Role / Device Role / Timing Role: Synchronous step-down regulator operating in forced PWM mode to maintain constant 1.2MHz switching frequency and avoid frequency-hopping noise in analog imaging paths. Use Value: 1μA shutdown current extends standby battery life; 100% duty cycle maintains regulation as battery drops to 2.8V, avoiding sensor reset during low-VBAT. |
| PDA Application Processor Rail | Portable Instrument ADC Reference Supply |
|
Use Scenario: Generating 1.5V for PDA application processors with dynamic DVFS scaling and burst-mode memory access. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting 0.1A–2.5A load steps with <50μs recovery time and <50mV undershoot/overshoot. Use Value: Peak current-mode control delivers superior transient response vs. voltage-mode alternatives, reducing need for oversized output capacitance. |
Use Scenario: Providing ultra-low-noise 3.3V supply to 16-bit SAR ADCs in handheld test equipment where PSRR and ripple directly impact ENOB. IC Role / Device Role / Timing Role: Regulator operating with feedforward capacitor (18pF) and low-ESR ceramic output cap (33μF) to suppress 1.2MHz switching artifacts. Use Value: Internal 0.8V reference accuracy (±24mV) and low FB bias current (±50nA) enable <0.1% output tolerance, preserving ADC full-scale accuracy. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3MHz switching frequency, 0.6V reference, 0.95A max output - smaller inductor but lower current capability. | Targeted at ultra-compact, sub-1A point-of-load rails; lacks 100% duty cycle and pre-bias startup support. | Select when board space is more constrained than current demand and 100% dropout is not required. |
| RT8059GJ6 | 1.5MHz frequency, 0.6V reference, 2A output, no PVIN/VIN separation - simpler layout but higher noise coupling risk. | Designed for cost-sensitive consumer electronics; missing cycle-by-cycle OCP and thermal hysteresis. | Choose for non-critical 2A loads where thermal margin is ample and BOM cost is prioritized over protection robustness. |
Compared with TPS62231DRYR and RT8059GJ6, MP9115DQT-LF-P uniquely combines 2.5A capability, 100% duty cycle, dual-input rail isolation, and pre-bias startup - making it the only option among the three qualified for Li+-powered systems demanding both high current and deep discharge operation.
Availability
MP9115DQT-LF-P is available at Aetrix Electronics and suitable for smartphone core power, digital camera image sensor supply, PDA application processor rail, and portable instrument ADC reference supply requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP9115DQT-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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP9115 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for portable Li+-battery applications where efficiency, small footprint, and robust protection under variable input conditions are mandatory.
FAQ
What is the maximum recommended output current for MP9115DQT-LF-P at 85°C ambient temperature?
The MP9115DQT-LF-P is rated for 2.5A continuous output at +25°C ambient. At +85°C, thermal derating applies: with θJA = 50°C/W and TJ(MAX) = 150°C, maximum allowable power dissipation is 1.3W. Accounting for typical 85% efficiency at 1.2V/2.5A, the practical sustained output current drops to approximately 1.8A to maintain safe junction temperature.
Can MP9115DQT-LF-P operate with an output voltage lower than 0.8V?
No. The internal feedback reference is fixed at 0.800V ±24mV, and the device regulates VOUT using the equation VOUT = 0.8V × (1 + R1/R2). Output voltages below 0.8V are not supported - attempting to set VOUT < 0.8V results in regulation failure and uncontrolled output collapse.
Why does MP9115DQT-LF-P have separate PVIN and VIN pins?
PVIN supplies only the high-side PFET driver and power switch, while VIN powers the internal controller, oscillator, and error amplifier. This separation minimizes switching noise coupling from the power stage into sensitive analog control circuitry, improving regulation accuracy and stability - especially critical with ceramic output capacitors.
Is an external feedforward capacitor (Cf) required for all output voltages?
No. Cf (e.g., 22pF for 1.2V output) is recommended only for VOUT ≤ 1.5V to improve phase margin and transient response. For VOUT ≥ 2.5V, the internal compensation is sufficient; Table 1 in the datasheet specifies Cf values per output voltage and confirms "NS" (Not Specified) for 2.5V and 3.3V configurations.
Does MP9115DQT-LF-P support forced PWM mode across all load conditions?
Yes. Unlike some buck converters that auto-switch to PFM at light loads, MP9115DQT-LF-P operates exclusively in forced PWM mode - maintaining constant 1.2MHz switching frequency regardless of load. This eliminates frequency-domain noise spreading and simplifies EMI filtering in noise-sensitive applications like imaging and audio.
What is the minimum recommended input capacitance for MP9115DQT-LF-P?
A minimum 10μF X5R/X7R ceramic capacitor is recommended at the PVIN pin, placed as close as possible to pins 6 (PVIN) and 2 (GND). This value suppresses high-frequency switching noise and limits input surge current; larger capacitance (e.g., 22μF) further reduces input ripple but is not required for basic functionality.
How does the MP9115DQT-LF-P handle short-circuit conditions?
Under output short, the MP9115DQT-LF-P reduces switching frequency and lowers the peak current limit to ~3.5A (from typical 4.5A), limiting fault power dissipation. Once the short is removed and FB voltage recovers toward 0.8V, the device automatically resumes normal 1.2MHz operation and full current capability without requiring a restart.
MP9115DQT-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TQFN (3x3)
MP9115DQT-LF-P FAQ
1.How can I place an order for MP9115DQT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9115DQT-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 MP9115DQT-LF-P reliable?
The price and inventory of MP9115DQT-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 MP9115DQT-LF-P is usually 5 days.
3.What payment methods are accepted for MP9115DQT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9115DQT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9115DQT-LF-P?
MP9115DQT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9115DQT-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 MP9115DQT-LF-P?
For technical support, including MP9115DQT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9115DQT-LF-P requirements.
6.How does Aetrix verify that MP9115DQT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP9115DQT-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 MP9115DQT-LF-P meets industry standards.
7.What is the process for return or replacement of MP9115DQT-LF-P?
All MP9115DQT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9115DQT-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 MP9115DQT-LF-P part is unused and in its original packaging.
Return procedure for MP9115DQT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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