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Monolithic Power Systems Inc. MP9115DQT-LF-Z
- Part No.:
- MP9115DQT-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MP9115DQT-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2.5A 10TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
MP9115DQT-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with 2.7–6V input, 2.5A continuous output, fixed 1.2MHz switching frequency, internal PFET/NFET power stage, and 0.8V reference voltage. It delivers regulated low-voltage power for single-cell Li+-powered portable electronics requiring high efficiency and compact footprint.
For engineers reviewing the MP9115DQT-LF-Z datasheet, MP9115DQT-LF-Z pinout, MP9115DQT-LF-Z application, or MP9115DQT-LF-Z equivalent, key selection criteria include its 100% duty-cycle capability for low-dropout operation, thermal shutdown protection, cycle-by-cycle current limiting, and compatibility with ceramic output capacitors in space-constrained designs.
Technical Context
The MP9115DQT-LF-Z implements peak current-mode PWM control with internal slope compensation and a fixed 1.2MHz oscillator, enabling stable regulation across 2.7–6V input while maintaining continuous conduction mode (CCM) only. Its integrated 0.25Ω high-side PFET and 0.20Ω low-side NFET support up to 2.5A load current with minimal external components.
Feedback is sensed at the FB pin using a resistor divider referenced to a precision 0.800V ±24mV bandgap voltage. The device supports pre-bias startup without reverse current flow through the LS MOSFET and includes dedicated PVIN (power FET supply) and VIN (controller supply) pins for optimized gate drive and noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - Supports single-cell Li+ battery operation including full discharge down to 2.7V. |
| Output Current | 2.5A continuous - Sustains full rated load without derating under typical thermal conditions (TA ≤ 70°C). |
| Switching Frequency | 1.2MHz (±0.2MHz) - Enables use of small 2.2μH inductors and reduces EMI filter size. |
| Reference Voltage | 0.800V ±24mV - Sets output voltage via external resistor divider; enables 0.8V minimum VOUT. |
| Shutdown Current | 1μA max - Minimizes battery drain during system sleep states. |
| Thermal Shutdown | 150°C trip with 20°C hysteresis - Protects die integrity during overload or poor PCB thermal design. |
| Duty Cycle Range | 0–100% - Maintains regulation even when VIN approaches VOUT, critical for battery end-of-life operation. |
Pinout & Package
MP9115DQT-LF-Z is housed in a thermally enhanced 10-pin TQFN package (3mm × 3mm, 0.75mm height) with exposed thermal pad. Pin 1 is marked by a dot; the exposed paddle must be soldered to PCB ground for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Enable/disable control input | Logic-high (>1.0V) disables regulator; pulls internal bias off, reducing quiescent current to ≤1μA. |
| 2 GND | Power and signal ground reference | Common return path for controller, power FETs, and feedback network; connects to exposed thermal pad. |
| 3,4 LX | Switch node | Drives external inductor; carries high di/dt switching current; requires short, low-inductance PCB routing. |
| 5,7,10 N/C | No connection | Internally unconnected; must remain floating or tied to GND per layout guidelines-no functional role. |
| 6 PVIN | Power FET supply | Provides gate drive voltage to high-side PFET; decoupled separately from VIN to reduce noise coupling. |
| 8 VIN | Controller supply | Powers internal logic, oscillator, and error amplifier; accepts same 2.7–6V range but routed separately from PVIN. |
| 9 FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT to 0.800V reference with ±3% accuracy over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >91% peak efficiency at 1.2V/2.5A with 5V input. |
| 100% duty-cycle operation | Enables dropout-free regulation down to VIN − (IL × RDS-ON_HFET), extending usable battery life. |
| Pre-bias startup support | LS MOSFET blocks reverse current during power-up into pre-charged output rail-prevents bus collapse. |
| Ceramic capacitor stability | Internal compensation ensures loop stability with low-ESR ceramic output caps (e.g., 33μF X5R), reducing BOM count. |
| Short-circuit foldback | Reduces switching frequency and peak current limit during output short, limiting power dissipation and junction temperature rise. |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Core voltage rail (1.2V/1.5V) for application processors and image signal processors in ultra-thin handsets. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise power with fast transient response to dynamic CPU load changes. Use Value: 1.2MHz switching allows compact 2.2μH inductor placement near SoC, minimizing PCB area while maintaining <20mV output ripple under 2.5A load steps. | Use Scenario: Sensor and ISP power in compact digital still/video cameras with Li+ battery input. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator converting battery voltage to fixed 2.5V or 3.3V for CMOS image sensors. Use Value: 91% peak efficiency extends recording time; 100% duty cycle sustains operation as battery discharges from 4.2V to 2.7V without brownout. |
| PDA Systems | Portable Instruments |
Use Scenario: Main system rail (1.8V/2.5V) in legacy PDA platforms with tight thermal constraints and limited board space. IC Role / Device Role / Timing Role: Single-chip step-down solution replacing discrete buck controllers + external MOSFETs, simplifying layout and qualification. Use Value: TQFN3x3 package fits within 10mm² footprint; thermal shutdown and current limiting eliminate need for external protection circuitry. | Use Scenario: Precision analog front-end (AFE) and microcontroller supply in handheld test equipment powered by Li+ cells. IC Role / Device Role / Timing Role: Low-noise, well-regulated power source for ADC references and op-amp rails where PSRR and ripple matter. Use Value: Stable CCM operation avoids subharmonic noise; FB reference accuracy (±3%) ensures consistent AFE biasing across temperature. |
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, 300mA lower max output current (2.2A) | Better light-load efficiency via DCS-Control™, but reduced thermal margin at full 2.5A | Select if higher frequency and smaller inductor are prioritized over peak current capability. |
| RT7295BGJ6F | 1.5MHz frequency, 0.6V reference, 3.5A peak current limit, no PVIN/VIN separation | Higher peak current supports brief surges, but lacks independent PVIN for noise-sensitive layouts | Select for cost-sensitive designs where PVIN/VIN integration is acceptable and surge tolerance is critical. |
Compared with TPS62231DRYR and RT7295BGJ6F, MP9115DQT-LF-Z uniquely balances 2.5A continuous delivery, 100% duty cycle, and dual-supply (PVIN/VIN) architecture-making it optimal for thermally constrained, battery-endurance-critical Li+ systems where layout noise isolation matters.
Availability
MP9115DQT-LF-Z is available at Aetrix Electronics and suitable for smartphones, digital cameras, PDAs, and portable instruments requiring stable component supply with RoHS-compliant, tape-and-reel packaging.
Supply support for MP9115DQT-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 power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control.
The MP9115 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for space- and efficiency-constrained portable Li+-battery applications demanding robust thermal behavior and minimal external components.
FAQ
What is the maximum recommended output current for continuous operation?
The MP9115DQT-LF-Z is rated for 2.5A continuous output current under standard thermal conditions (TA ≤ 70°C, 4-layer PCB with proper copper pour and thermal pad soldering). At ambient temperatures above 70°C or with inadequate PCB heat sinking, derating is required-junction temperature must remain below 150°C to avoid thermal shutdown.
Does MP9115DQT-LF-Z support forced PWM mode?
No-the MP9115DQT-LF-Z operates exclusively in continuous conduction mode (CCM) and does not feature a forced PWM or pulse-skipping mode. Its fixed 1.2MHz frequency and peak-current control ensure consistent switching behavior across all load conditions, eliminating audible noise and simplifying EMI filtering.
Can the FB pin be used for remote sensing?
No-remote sensing is not supported. The FB pin is designed for local feedback only, sampling voltage directly at the IC's FB pin. For improved load regulation, place the feedback resistor divider as close as possible to the FB and GND pins, and route the sense traces away from noisy nodes like LX.
What is the purpose of separate PVIN and VIN pins?
PVIN supplies the high-side PFET gate driver, while VIN powers the internal controller, oscillator, and error amplifier. Separating these supplies reduces noise coupling from high di/dt switching events into sensitive analog blocks, improving regulation accuracy and stability-especially critical in low-noise portable applications.
Is an external feedforward capacitor required for all output voltages?
A feedforward capacitor (Cf) is recommended only for low-output voltages (≤1.5V) to improve phase margin and transient response. As shown in the datasheet, Cf = 22pF is specified for 1.2V output; it is omitted for outputs ≥2.5V. Its inclusion stabilizes the control loop when the zero introduced by the R1–Cf network counteracts the ESR zero of the output capacitor.
How does short-circuit protection behave during fault recovery?
During output short, the MP9115DQT-LF-Z reduces switching frequency and lowers the peak current limit to limit power dissipation. Recovery is automatic: once the short is removed and FB voltage rises toward 0.8V, the device resumes normal 1.2MHz operation and full current limit within one switching cycle-no latch or manual reset required.
What is the minimum recommended input capacitance?
A minimum 10μF X5R or X7R ceramic capacitor is recommended at the PVIN pin, placed as close as possible to pins 6 (PVIN) and 2 (GND). This minimizes high-frequency input ripple and prevents voltage droop during peak current transitions, ensuring stable gate drive and preventing erratic switching behavior.
MP9115DQT-LF-Z 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-Z FAQ
1.How can I place an order for MP9115DQT-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9115DQT-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 MP9115DQT-LF-Z reliable?
The price and inventory of MP9115DQT-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 MP9115DQT-LF-Z is usually 5 days.
3.What payment methods are accepted for MP9115DQT-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9115DQT-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9115DQT-LF-Z?
MP9115DQT-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9115DQT-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 MP9115DQT-LF-Z?
For technical support, including MP9115DQT-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9115DQT-LF-Z requirements.
6.How does Aetrix verify that MP9115DQT-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP9115DQT-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 MP9115DQT-LF-Z meets industry standards.
7.What is the process for return or replacement of MP9115DQT-LF-Z?
All MP9115DQT-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9115DQT-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 MP9115DQT-LF-Z part is unused and in its original packaging.
Return procedure for MP9115DQT-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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