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Monolithic Power Systems Inc. MP28114DG-LF-Z
- Part No.:
- MP28114DG-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP28114DG-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,629
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Product details
Overview
MP28114DG-LF-Z from Monolithic Power Systems is a 1.7MHz constant-frequency, current-mode synchronous step-down DC/DC converter optimized for single-cell Li+-powered portable devices. It delivers up to 600mA load current from 2.5V–6V input, regulates output down to 0.6V, integrates PFET/NFET switches, and supports 100% duty-cycle operation for low-dropout applications.
For engineers reviewing the MP28114DG-LF-Z datasheet, MP28114DG-LF-Z pinout, MP28114DG-LF-Z application, or MP28114DG-LF-Z equivalent, key selection criteria include its ultra-small 2×2mm QFN8 package, 0.6V feedback reference, <0.1µA shutdown current, thermal/short-circuit protection, and fixed- or adjustable-output variants in production-grade automotive-qualified packaging.
Technical Context
The MP28114DG-LF-Z implements slope-compensated current-mode PWM control with a 1.7MHz oscillator, enabling stable regulation across wide input/output voltage ratios and fast transient response. Its internal 0.6V reference feeds an error amplifier that modulates switch on-time via peak-current sensing.
It integrates a 0.44Ω PFET main switch and 0.29Ω NFET synchronous rectifier, eliminating external Schottky diodes. The device enters 100% duty cycle when VIN approaches VOUT, maintaining regulation until limited by PFET current (0.7–1.35A) and thermal shutdown (145°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.7MHz ±24% - Enables compact LC filter design with ≤10µH inductors and sub-10µF ceramics. |
| Input Voltage Range | 2.5V to 6V - Matches single-cell Li-ion (2.7–4.2V) and dual-cell alkaline/nickel chemistries. |
| Output Current | 600mA continuous - Sustained under thermal limits with 2×2mm QFN8 and exposed pad tied to GND plane. |
| Feedback Reference | 0.600V ±2% - Sets precision output voltage via external resistor divider; enables 0.6V–6V programmability. |
| Shutdown Current | <0.1µA - Minimizes battery drain in standby mode for always-on portable subsystems. |
| Thermal Shutdown | 145°C trip point - Self-protects during overload or poor PCB thermal design; auto-recovery on cooldown. |
| UVLO Threshold | 2.27V rising edge with 55mV hysteresis - Prevents erratic startup near battery depletion while avoiding chatter. |
Pinout & Package
The MP28114DG-LF-Z is housed in a thermally enhanced 2×2mm QFN8 package with exposed thermal pad (pin 6/8), requiring solder connection to PCB ground plane for optimal power dissipation (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch node | Connects to inductor; carries high di/dt switching current; requires short, low-inductance routing. |
| 2,3 NC | No connect | Unbonded die pads; must remain unconnected per datasheet to avoid parasitic coupling or latch-up. |
| 4 EN | Enable control input | Logic-level enable: >1.5V = ON, <0.3V = shutdown (<0.1µA IQ); hysteresis prevents noise-induced toggling. |
| 5 FB | Feedback input | Senses divided output voltage; internal 0.6V reference sets regulation point; high-impedance (±50nA bias). |
| 6,8 GND / Exposed Pad | Power and thermal ground | Primary return path for switch current and thermal conduction; must be solidly connected to ≥2-layer GND plane. |
| 7 IN | Input supply | Accepts 2.5–6V; requires local 2.2µF+ ceramic bypass capacitor placed within 2mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFET/NFET power stage | Eliminates external Schottky diode; achieves up to 95% efficiency at 3.3V→1.8V/300mA without conduction loss penalty. |
| 100% duty-cycle operation | Maintains regulation down to VIN – VOUT ≈ 0.2V (at 600mA), critical for Li+ end-of-discharge support in handhelds. |
| Current-mode control with slope compensation | Ensures stability at >50% duty cycles; provides inherent cycle-by-cycle overcurrent limiting and fast line/load response. |
| Thermal and short-circuit protection | Reduces switching frequency and PFET current limit during fault conditions; recovers automatically when fault clears. |
| Ultra-small footprint | 2×2mm QFN8 occupies 4mm² board area - fits within tight space constraints of smartphones, wearables, and hearing aids. |
Applications
| Cellular Smartphones | Microprocessor Core Supplies |
|---|---|
|
Use Scenario: Powering application processor I/O or memory interface rails in compact smartphone designs with constrained PCB real estate. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 1.8V or adjustable 0.6–1.2V core voltage with fast transient response to burst-mode CPU loads. Use Value: 1.7MHz switching enables use of 2.2µF input and 4.7µF output ceramics, reducing total solution size by >40% versus 500kHz alternatives. |
Use Scenario: Supplying low-voltage, high-current cores (e.g., ARM Cortex-A series) in portable embedded systems operating from single Li+ cells. IC Role / Device Role / Timing Role: Adjustable-output buck converter regulating 0.6V–1.2V core rail with 0.6V reference accuracy and <1% load regulation over 0–600mA. Use Value: 100% duty-cycle capability sustains core voltage down to 2.5V input, extending usable battery life by ~12% compared to non-dropout regulators. |
| Portable Digital Cameras | Wearable Health Sensors |
|
Use Scenario: Generating clean 3.3V or 1.5V rails for CMOS image sensors and ISP processors in ultra-thin digital still/video cameras. IC Role / Device Role / Timing Role: Fixed-output variant (e.g., MP28114DG-3.3) providing low-noise, ripple-controlled power with integrated thermal protection during burst capture. Use Value: 95% peak efficiency minimizes self-heating in sealed camera modules; <0.1µA shutdown current preserves battery during standby intervals. |
Use Scenario: Powering ultra-low-power biosensor front-ends (ECG, PPG) and BLE SoCs in hearables and fitness trackers. IC Role / Device Role / Timing Role: Compact synchronous buck supplying regulated 1.8V from 3.0–4.2V Li+ battery, with precise enable control for system-level power gating. Use Value: 2×2mm QFN8 footprint allows placement directly beneath sensor ICs; EN pin logic compatibility enables direct GPIO control without level-shifting. |
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 |
|---|---|---|---|
| TI TPS62231DRYR | 1.8MHz, 600mA, 0.6V ref, same 2×2mm DSBGA but no 100% duty cycle; higher quiescent current (12µA) | Lacks dropout support below 2.7V input; less suitable for deep Li+ discharge scenarios | Select when BGA assembly is preferred and full dropout is not required |
| Analog Devices ADP2119ACPZ-R7 | 1.2MHz, 600mA, 0.6V ref, 3×3mm LFCSP; includes soft-start and power-good, but no thermal shutdown | Requires larger PCB area; lacks autonomous thermal recovery; needs external fault handling | Select when soft-start sequencing or PG signal is mandatory and thermal margin is guaranteed |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, the MP28114DG-LF-Z uniquely combines 100% duty-cycle operation, <0.1µA shutdown, and 2×2mm QFN8 in a single Li+-optimized package-making it the only choice for space-constrained, deep-discharge portable systems requiring autonomous fault recovery.
Availability
MP28114DG-LF-Z is available at Aetrix Electronics and suitable for cellular smartphones, portable medical sensors, digital imaging modules, and wearable electronics requiring stable component supply with RoHS-compliant, tape-and-reel packaging.
Supply support for MP28114DG-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP28114 belongs to MPS's ultra-compact DC/DC converter product line, engineered specifically for battery-powered portable electronics where minimal footprint, high light-load efficiency, and robust fault protection are mandatory.
FAQ
What is the minimum input voltage required for regulation at 600mA output?
The MP28114DG-LF-Z maintains regulation down to 2.5V input at full 600mA load, verified across –40°C to +85°C ambient. Below 2.5V, UVLO disables the device; at 2.5V input and 1.8V output, it operates at ~95% duty cycle with typical 0.2V dropout due to PFET RDS(on).
Can the MP28114DG-LF-Z be used with a fixed 1.8V output without external resistors?
No - the MP28114DG-LF-Z is the adjustable version requiring an external resistor divider on the FB pin. For fixed 1.8V output, use MP28114DG-1.8, which integrates the divider internally and replaces FB with OUT pin functionality.
How does the thermal pad (pins 6/8) affect PCB layout and reliability?
The exposed thermal pad must be soldered to a dedicated GND copper pour spanning ≥40mm² with ≥4 thermal vias (0.3mm diameter) to inner GND layers. Omitting this reduces θJA from 80°C/W to >120°C/W, risking thermal shutdown at >300mA continuous load.
Is the 1.7MHz switching frequency tolerant of input voltage variation?
Yes - oscillator frequency varies from 1.26MHz to 2.08MHz across 2.5–6V input, confirmed in datasheet Figure 5. This ±24% range is intentional and accommodated by standard LC filter design margins; no external compensation is needed.
Does the MP28114DG-LF-Z support forced PWM or power-save mode?
No - it operates exclusively in forced continuous conduction mode (CCM) using current-mode control. There is no pulse-skipping or discontinuous mode; light-load efficiency is maintained via low quiescent current (400–600µA), not mode switching.
What is the maximum recommended inductor DCR for 600mA operation?
Inductor DC resistance must be ≤200mΩ to limit conduction losses and maintain thermal stability at 600mA. At 0.2Ω DCR, worst-case I²R loss is 72mW - acceptable within the 1.56W max power dissipation limit of the 2×2mm QFN8 package.
How does short-circuit protection behave during sustained output fault?
Under sustained short, the MP28114DG-LF-Z reduces switching frequency and lowers PFET current limit to ~0.7A, limiting power dissipation. Once the short is removed and FB voltage rises above 0.6V, it resumes normal operation without requiring reset or power cycle.
MP28114DG-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN 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):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x2)
MP28114DG-LF-Z FAQ
1.How can I place an order for MP28114DG-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28114DG-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 MP28114DG-LF-Z reliable?
The price and inventory of MP28114DG-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 MP28114DG-LF-Z is usually 5 days.
3.What payment methods are accepted for MP28114DG-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28114DG-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28114DG-LF-Z?
MP28114DG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28114DG-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 MP28114DG-LF-Z?
For technical support, including MP28114DG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28114DG-LF-Z requirements.
6.How does Aetrix verify that MP28114DG-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP28114DG-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 MP28114DG-LF-Z meets industry standards.
7.What is the process for return or replacement of MP28114DG-LF-Z?
All MP28114DG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP28114DG-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 MP28114DG-LF-Z part is unused and in its original packaging.
Return procedure for MP28114DG-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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