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Monolithic Power Systems Inc. MP2128DG-LF-P
- Part No.:
- MP2128DG-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP2128DG-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,643
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Product details
Overview
MP2128DG-LF-P from Monolithic Power Systems is a 3MHz, current-mode, synchronous step-down DC/DC converter with integrated high-side PFET and low-side NFET switches, designed for single-cell Li-ion/Li-polymer battery-powered portable devices. It delivers up to 1A output current across a 2.5V–6V input range, regulates output down to 0.6V, and features <1µA shutdown current, internal soft-start, and cycle-by-cycle overcurrent protection.
For engineers reviewing the MP2128DG-LF-P datasheet, MP2128DG-LF-P pinout, MP2128DG-LF-P application, or MP2128DG-LF-P equivalent, key selection criteria include its 3MHz fixed-frequency operation, QFN8 (2mm×2mm) thermal performance (θJA = 50°C/W), 0.6V feedback reference accuracy (±2%), and integrated synchronous rectification eliminating external diode losses in space-constrained power rails.
Technical Context
The MP2128DG-LF-P implements peak-current-mode PWM control with slope compensation to ensure stability at duty cycles >50%, enabling robust line and load transient response. Its 3MHz oscillator allows use of ultra-small 1.2µH inductors and 10µF ceramic output capacitors-critical for compact mobile designs.
It supports 100% duty-cycle dropout operation, maintaining regulation as input voltage approaches output level, while short-circuit protection reduces switching frequency and PFET current limit to limit fault energy. Thermal shutdown activates at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports full discharge curve of single Li-ion (3.0–4.2V) and Li-polymer batteries without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to 6V - adjustable via external resistor divider; 0.6V feedback reference enables core supplies for modern microprocessors and DSPs. |
| Switching Frequency | 3MHz (typ.) - enables miniaturized passive components and reduces output ripple without compromising efficiency. |
| Max Output Current | 1A continuous - sustained under thermal limits in QFN8 package with θJA = 50°C/W on 4-layer PCB. |
| Feedback Reference Voltage | 0.594V (typ.), ±2% over –40°C to +85°C - ensures tight output regulation across temperature for precision analog and digital loads. |
| Shutdown Current | <1µA - extends battery life in standby/sleep modes of cellular phones and portable media players. |
| PFET On-Resistance | 200mΩ (typ.) - minimizes conduction loss during high-duty-cycle operation near input-output crossover. |
Pinout & Package
MP2128DG-LF-P uses an 8-pin QFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad for enhanced power dissipation. Pin 1 is marked by a dot or notch; the exposed paddle must be soldered to PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to center tap of external resistor divider; regulated at 0.594V ±2% to set output voltage. |
| 2,4 (AGND/PGND) | Analog & Power Ground | Separate AGND (pin 2) and PGND (pin 4) minimize noise coupling into feedback path; both connect to system ground plane. |
| 3 (IN) | Input Supply | Accepts 2.5V–6V; requires ≥4.7µF ceramic bypass capacitor placed adjacent to pin for high-frequency decoupling. |
| 5,6 (SW) | Power Switch Node | Drain connection of internal PFET/NFET; connects directly to inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 7 (EN) | Enable Control | Logic-level input: >1.6V = ON, <0.4V = OFF; supports sequencing and system-level power management. |
| 8 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines-no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated NFET replaces Schottky diode, eliminating forward voltage drop and improving light-load efficiency by up to 8%. |
| Current-Mode Control with Slope Compensation | Enables stable operation at >50% duty cycle and fast transient response without external compensation network. |
| 100% Duty-Cycle Operation | Maintains regulation during input voltage sag (e.g., battery discharge), reducing need for backup LDOs in portable systems. |
| Short-Circuit Protection with Foldback | Reduces switching frequency and PFET current limit during fault, limiting power dissipation and preventing thermal runaway. |
| Internal Soft-Start | 100µs ramp time prevents inrush current and output overshoot during startup, simplifying system power sequencing. |
Applications
| Cellular Phones | Microprocessor Core Supplies |
|---|---|
Use Scenario: Powering application processors and baseband ICs in slim smartphones operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.0–1.3V core voltage with fast load-step response to handle CPU burst activity. Use Value: 3MHz switching enables <1.5mm height solution with 1.2µH inductor; <1µA shutdown current extends standby time beyond 72 hours. | Use Scenario: Generating clean, low-noise 1.2V supply for ARM Cortex-A series microprocessor cores in embedded handheld devices. IC Role / Device Role / Timing Role: High-PSRR, low-ripple DC/DC converter with precise 0.6V feedback reference ensuring ±1% output accuracy under dynamic load. Use Value: Integrated synchronous FETs achieve >92% efficiency at 500mA, reducing thermal load in sealed enclosures without heatsinks. |
| PDA & Smartphones | Digital Still Cameras |
Use Scenario: Supplying I/O and memory rails (1.8V, 3.3V) in legacy PDAs and early-generation Android smartphones. IC Role / Device Role / Timing Role: Dual-rail support via resistor-divider reconfiguration; EN pin enables coordinated power-up/down sequencing with PMIC. Use Value: QFN8 package fits within 4mm² board area; thermal shutdown (150°C) protects against overheating during extended video capture. | Use Scenario: Powering CMOS image sensor and ISP processing blocks in compact digital cameras with battery-only operation. IC Role / Device Role / Timing Role: Low-noise buck converter supplying 2.8V sensor bias rail with <20mVpp output ripple measured at 100kHz bandwidth. Use Value: Cycle-by-cycle overcurrent protection prevents damage during sensor startup surge currents exceeding 800mA. |
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 | 2.05V–6V input, 3MHz, 0.6V ref, but only 0.6A max output; no 100% duty cycle. | Limited to lower-current peripherals (USB PHY, display drivers); unsuitable for processor cores. | Select when board space is tighter (1.5mm × 1.5mm DSBGA) and load ≤600mA. |
| RT8059GJ6 | 2.5V–5.5V input, 2MHz, 0.6V ref, 1A rating, but lacks short-circuit foldback and has higher 2.5µA shutdown current. | Acceptable for cost-sensitive consumer audio players where fault robustness is secondary. | Choose for BOM cost reduction if thermal margin >15°C and short-circuit exposure is negligible. |
Compared with TPS62231DRYR and RT8059GJ6, MP2128DG-LF-P uniquely combines 1A capability, 100% duty-cycle operation, and sub-1µA shutdown in a thermally optimized QFN8-making it the only choice for Li-ion-powered microprocessor core rails demanding both efficiency and dropout resilience.
Availability
MP2128DG-LF-P is available at Aetrix Electronics and suitable for cellular phones, microprocessor core supplies, and portable instrumentation requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2128DG-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, headquartered in California and serving global power management markets since 1997.
The MP2128 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for space- and efficiency-critical portable electronics powered by single-cell lithium batteries.
FAQ
What is the recommended input capacitor for MP2128DG-LF-P?
A minimum 4.7µF X5R/X7R ceramic capacitor rated ≥6.3V must be placed as close as possible to the IN and PGND pins. For improved EMI and transient response, a parallel 0.1µF capacitor is recommended. Total effective capacitance should exceed 5µF with low ESL construction.
Does MP2128DG-LF-P require an external compensation network?
No. The MP2128DG-LF-P uses internal compensation optimized for standard 1.2µH inductors and 10µF ceramic output capacitors. No external RC network is needed-reducing BOM count and layout complexity while ensuring stability across all operating conditions.
Can MP2128DG-LF-P operate with input voltage below 2.5V?
No. The absolute minimum input voltage is 2.5V per datasheet specifications. Below this, UVLO prevents startup and regulation is not guaranteed. Attempting operation below 2.5V may cause erratic behavior or failure to regulate due to insufficient gate drive for internal FETs.
How is thermal performance affected if the exposed paddle is not soldered?
Leaving the exposed thermal pad unsoldered increases θJA by ~35°C/W, degrading power handling by over 50%. At 1A load, junction temperature may exceed 150°C within seconds. Full-surface soldering to a 6cm² internal ground plane is mandatory for reliable 1A operation.
What happens during output short-circuit condition?
Upon short circuit, MP2128DG-LF-P reduces switching frequency and lowers PFET current limit to ~0.5A, limiting fault power. Output voltage collapses, but device remains functional. Recovery occurs automatically once short is removed and FB voltage rises above 0.6V-no latch-off or manual reset required.
Is MP2128DG-LF-P pin-compatible with MP2128DT?
No. MP2128DG-LF-P uses an 8-pin QFN package with different pinout (e.g., separate AGND/PGND, NC pin), while MP2128DT uses a 5-pin SOT23. Layout, routing, and thermal design are not interchangeable-PCB redesign is required for package substitution.
MP2128DG-LF-P 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:
- 1A
- Frequency - Switching:
- 2.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x2)
MP2128DG-LF-P FAQ
1.How can I place an order for MP2128DG-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2128DG-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 MP2128DG-LF-P reliable?
The price and inventory of MP2128DG-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 MP2128DG-LF-P is usually 5 days.
3.What payment methods are accepted for MP2128DG-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2128DG-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2128DG-LF-P?
MP2128DG-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2128DG-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 MP2128DG-LF-P?
For technical support, including MP2128DG-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2128DG-LF-P requirements.
6.How does Aetrix verify that MP2128DG-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2128DG-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 MP2128DG-LF-P meets industry standards.
7.What is the process for return or replacement of MP2128DG-LF-P?
All MP2128DG-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2128DG-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 MP2128DG-LF-P part is unused and in its original packaging.
Return procedure for MP2128DG-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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