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Monolithic Power Systems Inc. MP20051DN-LF
- Part No.:
- MP20051DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP20051DN-LF.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,117
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Product details
Overview
MP20051DN-LF from Monolithic Power Systems is a low-noise, high-PSRR 1A linear regulator with 140mV dropout at 1A, 110μA ground current, and adjustable 0.8V–5V output across 2.5V–5.5V input. It uses an internal PMOS pass element and integrates thermal shutdown, current limiting, and logic-controlled enable for battery-powered portable electronics.
For engineers reviewing the MP20051DN-LF datasheet, MP20051DN-LF pinout, MP20051DN-LF application, or MP20051DN-LF equivalent, key selection criteria include dropout voltage under load, PSRR at 1kHz (63dB), output noise (13μVRMS), EN threshold (1.5V/0.4V), and SOIC8E package thermal resistance (θJA = 50°C/W).
Technical Context
The MP20051DN-LF implements a PMOS-based LDO architecture with externally adjustable feedback via a resistor divider referenced to a precise 0.8V FB threshold. Its low quiescent current (110μA at no load) and fast 45μs startup time support always-on subsystems in power-constrained devices.
It delivers stable regulation with ceramic capacitors (4.7μF output), achieves 63dB PSRR at 1kHz due to high-loop-gain error amplifier design, and maintains ±2% output accuracy over temperature while rejecting line/load transients via optimized control loop dynamics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports core logic rails in portable SoC applications without derating at TA ≤ 85°C. |
| Dropout Voltage | 140mV at 1A - enables operation with minimal VIN–VOUT margin, e.g., 2.5V input → 2.36V output. |
| Ground Current | 110μA at 100mA load - extends battery runtime in standby mode for handheld instruments. |
| PSRR | 63dB @1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCB layouts. |
| Output Noise | 13μVRMS (10Hz–100kHz) - meets low-noise analog supply requirements for RF transceivers and ADCs. |
| Enable Threshold | EN high = 1.5V, low = 0.4V - compatible with 1.8V/3.3V GPIO without level-shifting. |
| Thermal Shutdown | 150°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
MP20051DN-LF is packaged in an SOIC8E (Small Outline Integrated Circuit, 8-pin, exposed pad variant) with standard 1.27mm pitch and JEDEC MS-012 compliant footprint. The exposed pad on the bottom must be soldered to a GND plane for optimal thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 VOUT | Regulator output | Parallel pins reduce IR drop and inductance; requires 4.7μF ceramic capacitor to GND for stability. |
| 3 FB | Feedback input | 0.8V reference threshold; connects to resistor divider to set output voltage from 0.8V to 5V. |
| 4 GND | Ground terminal | Exposed pad pin; must be connected to PCB ground plane to achieve rated thermal performance and EMI suppression. |
| 5 EN | Enable control | Logic-compatible input: >1.5V enables regulation, <0.4V disables output and reduces supply current to 0.2μA. |
| 6 NC | No connection | Internally unconnected; must remain floating-no external tie or pull-up/down. |
| 7, 8 VIN | Input supply | Parallel pins minimize input path impedance; bypass with 2.2μF ceramic capacitor close to pins. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 13μVRMS output noise enables clean power for RF front-ends and precision analog circuits. |
| High PSRR architecture | 63dB rejection at 1kHz allows co-location with noisy buck converters without filtering. |
| Ceramic-capacitor stability | Guaranteed stability with standard 4.7μF X5R/X7R ceramics-eliminates need for costly tantalum or electrolytic caps. |
| Fast transient response | 45μs startup and excellent load-step recovery minimize brownout risk during processor wake-up events. |
| Integrated protection | Current limit (1.6A short-circuit), thermal shutdown (150°C), and UVLO (2.25V) prevent system-level fault propagation. |
Applications
| Notebook Computers | Cordless Telephones |
|---|---|
Use Scenario: Powering DDR memory termination or USB PHY circuitry requiring ultra-low noise and tight voltage tolerance. IC Role / Device Role / Timing Role: Low-dropout post-regulator delivering stable 1.2V/1.5V/1.8V from main 3.3V rail. Use Value: 140mV dropout preserves headroom under dynamic load; 13μVRMS noise avoids bit errors in high-speed data links. | Use Scenario: Supplying baseband processor and audio codec in DECT handsets with intermittent transmit bursts. IC Role / Device Role / Timing Role: Primary LDO for sensitive analog sections, enabled/disabled synchronously with RF activity. Use Value: 110μA quiescent current extends talk time; 63dB PSRR isolates audio path from PA switching noise. |
| Cellular Phones | Wireless Communication Equipment |
Use Scenario: Biasing camera sensor modules and touch controller ICs where EMI-sensitive analog signals coexist with digital noise. IC Role / Device Role / Timing Role: Dedicated low-noise supply rail decoupled from shared PMIC outputs. Use Value: Ceramic-capacitor compatibility reduces BOM count; ±2% output accuracy ensures consistent sensor calibration. | Use Scenario: Powering WLAN/BT combo chips in access points and IoT gateways operating in thermally constrained enclosures. IC Role / Device Role / Timing Role: Local point-of-load regulator for RF transceiver VDD_IO and VDD_ANA domains. Use Value: SOIC8E package with exposed pad sustains 1A load at 85°C ambient; thermal hysteresis prevents cycling during overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, high-PSRR 1A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7A4700RGWR | Lower noise (4.7μVRMS), higher IQ (1.1mA), fixed 3.3V output only | Requires external resistor network for adjustability; less suitable for multi-rail systems needing programmable VOUT | Select when ultra-low noise dominates over quiescent current and output flexibility. |
| Analog Devices ADM7172ACPZ-R7 | Higher PSRR (70dB @1kHz), wider input range (2.3V–6.5V), but larger 10-lead LFCSP package | Superior high-frequency PSRR benefits RF-intensive designs; requires more PCB area and reflow profile validation | Select when board space permits and >65dB PSRR above 100kHz is critical for receiver sensitivity. |
Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, MP20051DN-LF offers the best balance of ultra-low IQ (110μA), full 0.8V–5V adjustability in SOIC8E, and proven ceramic-capacitor stability-making it optimal for cost- and size-sensitive portable designs where moderate PSRR suffices.
Availability
MP20051DN-LF is available at Aetrix Electronics and suitable for notebook computers, cordless telephones, cellular phones, and wireless communication equipment requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP20051DN-LF 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 MP20051 belongs to MPS's low-noise LDO product line, engineered specifically for portable and wireless applications demanding high PSRR, low quiescent current, and ceramic-capacitor compatibility in compact packages.
FAQ
What is the minimum input voltage required for MP20051DN-LF to regulate a 1.2V output?
The MP20051DN-LF requires a minimum input voltage of 1.34V (1.2V + 140mV dropout) to maintain regulation at 1A load. However, its absolute minimum specified input is 2.5V per datasheet operating conditions-so 2.5V is the practical lower limit regardless of dropout, ensuring UVLO release and guaranteed performance across temperature.
Can MP20051DN-LF operate stably with a 2.2μF ceramic input capacitor and no output capacitor?
No. The MP20051DN-LF requires a minimum 4.7μF ceramic output capacitor for stability, as confirmed in the datasheet's "Output Capacitor Selection" section. Omitting it risks oscillation, poor transient response, and potential thermal runaway under load-input capacitance alone does not satisfy phase-margin requirements.
How does the EN pin behave during power-up if left unconnected?
Leaving the EN pin floating violates the datasheet requirement ("Do not float the EN pin"). It may result in unpredictable startup behavior-including partial turn-on, oscillation, or delayed regulation-due to noise coupling or internal leakage. Always tie EN to VIN (for always-on) or to a controlled GPIO with defined logic levels.
Is the exposed pad on the SOIC8E package electrically connected to GND internally?
Yes-the exposed pad on the MP20051DN-LF SOIC8E package is internally connected to the GND terminal (Pin 4). It must be soldered to a PCB ground plane to achieve the specified θJA = 50°C/W and ensure proper thermal dissipation and EMI shielding.
What is the maximum allowable output capacitance for MP20051DN-LF?
The datasheet specifies no upper limit on output capacitance. Larger values (e.g., 10μF–22μF) improve load-transient response and reduce output ripple but increase inrush current and startup time. Stability is maintained across all ceramic values ≥4.7μF, including X5R/X7R types with typical ESR <10mΩ.
Does MP20051DN-LF support reverse-voltage protection on the input or output?
No. The MP20051DN-LF lacks integrated reverse-voltage protection. Absolute maximum ratings specify VIN to GND down to –0.3V and OUT to GND down to –0.5V. External diodes or MOSFET-based protection circuits are required if reverse polarity or back-driving scenarios exist in the system.
MP20051DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.28V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 600 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 33dB (100Hz ~ 1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP20051DN-LF FAQ
1.How can I place an order for MP20051DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP20051DN-LF 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 MP20051DN-LF reliable?
The price and inventory of MP20051DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP20051DN-LF is usually 5 days.
3.What payment methods are accepted for MP20051DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP20051DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP20051DN-LF?
MP20051DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP20051DN-LF 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 MP20051DN-LF?
For technical support, including MP20051DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP20051DN-LF requirements.
6.How does Aetrix verify that MP20051DN-LF is sourced from the original manufacturer or authorized distributors?
All MP20051DN-LF 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 MP20051DN-LF meets industry standards.
7.What is the process for return or replacement of MP20051DN-LF?
All MP20051DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP20051DN-LF, 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 MP20051DN-LF part is unused and in its original packaging.
Return procedure for MP20051DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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