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Monolithic Power Systems Inc. MP2128DT-LF-P
- Part No.:
- MP2128DT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MP2128DT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
MP2128DT-LF-P from Monolithic Power Systems is a 3MHz synchronous step-down DC/DC converter with integrated high- and low-side MOSFETs, designed for single-cell Li-ion/Li-polymer battery-powered portable devices. It delivers up to 1A output current across 2.5V–6V input, regulates down to 0.6V output, and features <1µA shutdown current, cycle-by-cycle overcurrent protection, and internal soft-start.
For engineers reviewing the MP2128DT-LF-P datasheet, MP2128DT-LF-P pinout, MP2128DT-LF-P application, or MP2128DT-LF-P equivalent, key selection criteria include its 3MHz fixed-frequency current-mode control, 0.6V feedback reference, SOT23-5 package thermal performance (θJA = 220°C/W), and dropout operation enabling 100% duty cycle at low VIN.
Technical Context
The MP2128DT-LF-P implements peak current-mode PWM control with slope compensation to ensure stability at duty cycles >50%, supporting fast transient response and inherent cycle-by-cycle current limiting. Its 3MHz oscillator enables compact external components-typically a 1.2µH inductor and 10µF ceramic output capacitor.
It integrates a 200mΩ P-channel main switch and 150mΩ N-channel synchronous rectifier, eliminating external diode losses. The device enters dropout mode below VOUT/VIN ≈ 0.6, holding the high-side FET continuously on while limiting peak current to 1.5A to sustain regulated output under low-input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports direct regulation from single Li-ion (3.0–4.2V) or USB-powered systems (5V). |
| Output Voltage Range | 0.6V to 6V - adjustable via external resistor divider; 0.6V FB reference enables core voltage rails for microprocessors and DSPs. |
| Switching Frequency | 3MHz (typ.) - allows use of sub-2.2µH inductors and low-ESR ceramic capacitors for ultra-compact PCB layouts. |
| Max Output Current | 1A continuous - achievable at ambient ≤+85°C in SOT23-5 with proper thermal layout (PD ≤0.57W). |
| Feedback Reference | 0.594V (typ.) - tightly regulated ±1.5% over –40°C to +85°C ensures stable output under temperature variation. |
| Shutdown Current | <1µA - enables long battery standby time in always-on portable instrumentation and smart sensors. |
| Thermal Shutdown | 150°C threshold with 20°C hysteresis - protects die during sustained overload or poor heatsinking without latch-up. |
Pinout & Package
MP2128DT-LF-P is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (1.5mm height, JEDEC MO-178 AA), optimized for space-constrained portable designs. Thermal resistance θJA = 220°C/W on standard 4-layer PCB.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | Active-high enable input; logic-high ≥1.6V activates regulator; logic-low ≤0.4V disables with <1µA quiescent draw. |
| 2 | GND | Analog ground reference for FB and EN; must be connected to low-impedance PGND plane to minimize noise coupling. |
| 3 | SW | Switch node connecting internal PFET drain and NFET source; requires tight layout to SW capacitor and inductor to reduce EMI. |
| 4 | IN | Power input; bypassed with ≥4.7µF X5R/X7R ceramic capacitor placed adjacent to pin to suppress high-frequency ripple. |
| 5 | FB | Resistor-divider feedback input; senses output voltage and compares to 0.6V internal reference to regulate VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 200mΩ PFET + 150mΩ NFET eliminates Schottky loss, enabling >95% efficiency at 500mA load. |
| Current-mode PWM control | Slope-compensated architecture ensures stable operation up to 95% duty cycle and fast line/load transient response. |
| 100% duty-cycle dropout | Maintains regulation as VIN approaches VOUT by holding PFET fully on, critical for battery end-of-discharge operation. |
| Short-circuit protection | Reduces switching frequency and lowers current limit during fault, limiting power dissipation and enabling auto-recovery. |
| Internal soft-start | 100µs controlled ramp prevents inrush current and output overshoot during startup into large capacitive loads. |
Applications
| Cellular Phones | Microprocessor Core Supplies |
|---|---|
Use Scenario: Powering baseband and application processors in slim smartphones operating from 3.6V nominal Li-ion battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1A core voltage with fast transient response to CPU burst loads. Use Value: 3MHz switching minimizes inductor size (<1.5mm height), enabling thin-profile PCB stacking in multi-layer mobile designs. | Use Scenario: Generating clean, low-noise 1.8V supply for DSP or FPGA I/O banks in portable test equipment. IC Role / Device Role / Timing Role: Secondary buck stage regulating from intermediate 3.3V rail, with tight 0.6V FB tolerance ensuring ±1.5% output accuracy. Use Value: Internal soft-start prevents brown-out during power-up sequencing, avoiding configuration errors in programmable logic devices. |
| PDA & Smartphones | Digital Cameras |
Use Scenario: Supplying 3.3V to display interface and memory controllers in handheld PDAs with limited board area. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter minimizing heat generation near sensitive analog front-ends. Use Value: <1µA shutdown current extends battery life during screen-off periods without requiring external power gating circuitry. | Use Scenario: Providing 2.8V bias to CMOS image sensor and 1.2V to ISP processor in compact digital still/video cameras. IC Role / Device Role / Timing Role: Dual-output capable via external resistor networks; supports multiple rail requirements from single IC footprint. Use Value: Cycle-by-cycle overcurrent protection safeguards against shorted sensor flex cables during mechanical insertion/removal. |
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 | 2.25MHz switching, 0.6V FB, 1A rating, 6-pin WSON package (2×2mm) | Requires external soft-start capacitor; lacks integrated short-circuit frequency foldback | Preferred when lower EMI is prioritized over smallest footprint; compatible with same inductor/capacitor values. |
| RT8059GJ6 | 1.5MHz switching, 0.6V FB, 1A rating, 6-pin TSOT23 package | Higher quiescent current (25µA vs. 0.01µA); no 100% duty-cycle mode | Selected for cost-sensitive industrial controls where battery standby is not required and board space is less constrained. |
Compared with TPS62231DRYR and RT8059GJ6, MP2128DT-LF-P offers superior battery standby performance (<1µA shutdown), higher switching frequency for smaller passives, and robust fault recovery via adaptive short-circuit protection-making it optimal for space- and energy-critical portable electronics.
Availability
MP2128DT-LF-P is available at Aetrix Electronics and suitable for cellular phones, microprocessor core supplies, and portable media players requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for MP2128DT-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 markets since 1997.
The MP2128 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for ultra-compact, battery-powered consumer electronics demanding minimal bill-of-materials and high light-load efficiency.
FAQ
What is the maximum recommended PCB copper area for thermal relief of MP2128DT-LF-P in SOT23-5?
For reliable 1A operation at +85°C ambient, Monolithic Power recommends a minimum 120mm² exposed copper pad connected to Pin 2 (GND) with ≥4 thermal vias (0.3mm diameter) to inner ground planes. This achieves effective θJA ≈ 180°C/W, staying within the 0.57W power dissipation limit at TJ ≤125°C.
Can MP2128DT-LF-P operate with an input voltage below 2.5V?
No. The absolute minimum input voltage is 2.5V per datasheet specifications. Below this, the internal UVLO circuit disables the device, and regulation cannot be maintained-even in dropout mode. Attempting operation below 2.5V risks erratic behavior or failure to start.
Is the FB pin internally compensated, or does it require external compensation components?
The MP2128DT-LF-P uses internal Type-II compensation. No external compensation network is required-only the standard resistor divider (e.g., 200kΩ/100kΩ for 1.8V) is needed at FB. This simplifies design and reduces component count versus externally compensated converters.
Does MP2128DT-LF-P support forced PWM mode, or does it automatically enter PFM at light loads?
MP2128DT-LF-P operates exclusively in forced PWM mode across all load conditions. It maintains constant 3MHz switching frequency from zero to full load, eliminating audible noise and ensuring predictable EMI profiles-critical for RF-sensitive portable applications.
What is the typical output voltage accuracy over temperature and line regulation?
Output voltage accuracy is dominated by the 0.6V FB reference, specified as 0.576V to 0.612V (±3%) over –40°C to +85°C. Line regulation is ±0.2% over 2.5V–6V input, and load regulation is ±0.5% from 0–1A, measured with proper PCB layout and output capacitance.
How does the short-circuit protection behave during sustained output shorts?
Under sustained short, MP2128DT-LF-P reduces switching frequency to ~300kHz and lowers current limit to ~0.5A, limiting power dissipation to safe levels. Once the short is removed and FB voltage recovers to 0.6V, it resumes normal 3MHz operation automatically-no reset or external intervention required.
MP2128DT-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
MP2128DT-LF-P FAQ
1.How can I place an order for MP2128DT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2128DT-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 MP2128DT-LF-P reliable?
The price and inventory of MP2128DT-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 MP2128DT-LF-P is usually 5 days.
3.What payment methods are accepted for MP2128DT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2128DT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2128DT-LF-P?
MP2128DT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2128DT-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 MP2128DT-LF-P?
For technical support, including MP2128DT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2128DT-LF-P requirements.
6.How does Aetrix verify that MP2128DT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2128DT-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 MP2128DT-LF-P meets industry standards.
7.What is the process for return or replacement of MP2128DT-LF-P?
All MP2128DT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2128DT-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 MP2128DT-LF-P part is unused and in its original packaging.
Return procedure for MP2128DT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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