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Monolithic Power Systems Inc. MP2005DD-LF-Z
- Part No.:
- MP2005DD-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP2005DD-LF-Z.pdf
- Description:
- IC REG LINEAR POS ADJ 800MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,053
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Product details
Overview
MP2005DD-LF-Z from Monolithic Power Systems is an 800mA ultra-low-dropout (ULDO) linear regulator with high PSRR, dual-supply architecture (VIN + VBIAS), and adjustable 0.5V–4.0V output. It delivers 90mV dropout at full load, 65dB PSRR at 1kHz, and operates from 1.0V–5.5V VIN while requiring a separate 2.7V–5.5V bias supply. It is used in post-regulation stages after buck converters in battery-powered portable electronics.
For engineers reviewing the MP2005DD-LF-Z datasheet, MP2005DD-LF-Z pinout, MP2005DD-LF-Z application, or MP2005DD-LF-Z equivalent, key selection criteria include its dual-rail operation (VIN/VBIAS), 100µA bias current, 1µF ceramic capacitor stability, thermal/current protection, and FB-based output programming - all critical for low-noise, high-efficiency power sequencing in space-constrained designs.
Technical Context
The MP2005DD-LF-Z implements a super-low-dropout architecture where the output current flows directly from VIN, while internal reference and drive circuitry are powered separately via VBIAS - enabling optimized noise isolation and reduced decoupling capacitance. Its feedback threshold is fixed at 0.5V, supporting precise output programming across 0.5V–4.0V using external resistors.
It achieves fast transient response and stability with ultra-low-ESR ceramic capacitors ≥1µF, thanks to internal compensation tuned for low-bias operation. Thermal shutdown (155°C) and foldback current limiting protect under fault conditions without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800mA max - supports mid-power SoC core rails and FPGA I/O banks without derating at 85°C ambient. |
| Dropout Voltage | 90mV @ 800mA - enables regulation from 1.2V input to 1.1V output, critical for sub-1.2V logic domains. |
| PSRR | 65dB @ 1kHz, 48dB @ 1MHz - suppresses switching noise from upstream DC/DC converters in mixed-signal systems. |
| Feedback Voltage | 0.500V ±1% - sets output accuracy and enables precise resistor-divider programming (e.g., 1.8V with 10kΩ/26kΩ). |
| Bias Supply Range | 2.7V–5.5V - allows direct connection to battery or auxiliary rail, decoupling reference stability from noisy VIN. |
| Ground Current | 100µA typical @ light load - extends battery life in always-on subsystems like RTC or sensor interfaces. |
| Capacitor Stability | Stable with ≥1µF ceramic output capacitor - eliminates need for bulky tantalum or electrolytic caps, reducing board area. |
Pinout & Package
MP2005DD-LF-Z is housed in an 8-pin QFN package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high thermal efficiency (θJA = 55°C/W) and compact layout in portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Primary input power rail | Carries full 800mA load current; requires ≥1µF ceramic bypass to GND near pin for EMI suppression. |
| 2 BIAS | Independent bias supply input | Powers internal reference and control circuitry; must be ≥2.7V and ≥1.5V above VOUT for proper regulation. |
| 3, 6 NC | No-connect terminals | Internally unconnected; must remain floating or grounded per PCB layout best practice - no routing or vias. |
| 4 GND | Power and signal ground reference | Shared return path for IN, BIAS, EN, FB, and OUT; requires low-impedance connection to thermal pad and system ground plane. |
| 5 EN | Enable control input | Active-high logic (≥1.3V); ties to BIAS or VIN for automatic startup; draws ±1µA leakage when asserted. |
| 7 FB | Resistive feedback node | Senses divided output voltage; referenced to 0.5V internal threshold - determines final regulated output value. |
| 8 OUT | Regulated output terminal | Delivers clean, low-noise DC output; requires ≥1µF ceramic bypass to GND adjacent to pin for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail supply architecture | VIN powers output stage only; VBIAS powers reference/control - isolates noise-sensitive circuitry from power-path ripple. |
| Ultra-low quiescent bias current | 100µA typical - enables use in battery-backed subsystems with multi-year shelf life and minimal standby drain. |
| Adjustable output via resistor divider | 0.5V–4.0V range with 2% accuracy - supports dynamic voltage scaling and multiple rail generation from single IC. |
| Thermal and current protection | 155°C shutdown with 30°C hysteresis and foldback current limit - prevents damage during overload or poor heatsinking. |
| High PSRR up to 1MHz | 48dB at 1MHz - effectively filters high-frequency switching artifacts from DC/DC converters in RF and audio sections. |
Applications
| Mobile Baseband Power | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Regulating 1.2V core voltage for LTE modem baseband processor after primary buck conversion. IC Role / Device Role / Timing Role: Post-regulator providing ultra-low-noise, high-PSRR supply to sensitive analog/RF blocks. Use Value: 65dB PSRR at 1kHz suppresses buck converter ripple, preventing bit errors and receiver desensitization. |
Use Scenario: Powering ultra-low-power environmental sensor cluster (accelerometer, temperature, humidity) in smartwatch. IC Role / Device Role / Timing Role: Adjustable LDO delivering 1.8V from coin-cell–fed bias rail while minimizing standby current. Use Value: 100µA bias current and 1µF capacitor stability extend battery runtime beyond 6 months in continuous monitoring mode. |
| FPGA I/O Bank Supply | Medical Patch Monitor |
|
Use Scenario: Generating configurable 2.5V or 3.3V I/O supply for FPGA bank interfacing with legacy peripherals. IC Role / Device Role / Timing Role: Programmable ULDO enabling flexible interface voltage matching without discrete regulators. Use Value: 0.5V feedback reference and resistor-divider flexibility allow precise output setting within 2% tolerance across temperature. |
Use Scenario: Providing stable 3.0V supply to ECG front-end amplifier and Bluetooth LE radio in disposable patient patch. IC Role / Device Role / Timing Role: Low-noise, thermally protected LDO ensuring signal integrity and regulatory compliance under variable skin-contact thermal conditions. Use Value: 155°C thermal shutdown and 90mV dropout enable safe operation on small PCBs with limited copper area and no heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6216D332MR-G | Single-supply (no VBIAS pin); 300mA output; 200mV dropout @ 300mA; 55dB PSRR @ 1kHz | Lacks dual-rail architecture and bias isolation - unsuitable for noise-critical post-regulation where VIN is noisy. | Select only for cost-sensitive, lower-current applications where PSRR >60dB and <1µF capacitor stability are not required. |
| Analog Devices ADM7172ACPZ-R7 | Single-supply; 2A output; 125mV dropout @ 2A; 70dB PSRR @ 100Hz but drops to 35dB @ 1MHz | Higher current capability but inferior high-frequency PSRR and larger 10-pin LFCSP package (3mm × 3mm). | Prefer for high-current, low-PSRR-at-DC applications; avoid where 1MHz switching noise rejection is essential. |
Compared with XC6216D332MR-G and ADM7172ACPZ-R7, MP2005DD-LF-Z uniquely balances 800mA output, dual-supply noise isolation, 65dB/48dB PSRR across 1kHz–1MHz, and 2mm × 3mm footprint - making it optimal for compact, battery-powered systems demanding both efficiency and signal integrity.
Availability
MP2005DD-LF-Z is available at Aetrix Electronics and suitable for mobile baseband power, wearable sensor hubs, FPGA I/O bank supplies, and medical patch monitors requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP2005DD-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 MP2005 belongs to MPS's ultra-low-noise, high-PSRR LDO product line, engineered specifically for post-regulation in battery-powered portable electronics where VIN is derived from switching converters and noise immunity is critical.
FAQ
Can MP2005DD-LF-Z operate with VIN and VBIAS supplied from the same source?
Yes, if that source meets both requirements: VIN ≥1.0V and ≤5.5V, and VBIAS ≥2.7V and ≥1.5V above the desired output voltage. For example, a 3.6V battery can serve both rails when regulating 1.8V output. However, separating VBIAS improves PSRR by isolating reference circuitry from VIN ripple.
What is the minimum output capacitor value for stable operation?
The MP2005DD-LF-Z is stable with a minimum 1µF ceramic capacitor on the OUT pin. Using X5R or X7R dielectrics with low ESR ensures robust phase margin across temperature and load. Larger values (e.g., 4.7µF) improve transient response but are not required for stability.
How does the EN pin behave during power-up?
The EN pin has a 1.3V threshold for activation and 0.8V for deactivation. When tied to VBIAS (≥2.7V), the device turns on immediately after VBIAS reaches regulation. No external pull-up is needed; internal hysteresis prevents chatter during slow-rising enable signals.
Is the exposed thermal pad electrically connected?
Yes - the exposed pad is internally connected to GND. It must be soldered to a dedicated GND copper pour on the PCB for thermal performance and electrical safety. Thermal resistance drops from θJA = 55°C/W to ≤40°C/W with proper pad connection and 2+ internal GND layers.
Does MP2005DD-LF-Z support reverse current blocking?
No - the MP2005DD-LF-Z lacks integrated reverse-current protection. If reverse current flow from OUT to IN is possible (e.g., during shutdown with charged output cap), an external Schottky diode in series with IN is recommended to prevent backfeed and potential damage.
What is the impact of using R2 = 100kΩ in the feedback divider?
Using R2 = 100kΩ increases divider impedance, raising sensitivity to noise and leakage currents. While functional, it may degrade output accuracy and transient response. MPS recommends R2 = 10kΩ for optimal noise immunity and stability; R1 is then scaled proportionally (e.g., 26kΩ for 1.8V).
How does load regulation performance compare across temperature?
Load regulation is specified as better than 0.0005%/mA over –40°C to +85°C. This translates to <0.4mV change in 1.8V output across full 800mA load range at maximum temperature - confirming tight regulation for precision analog loads like ADC references or RF synthesizers.
MP2005DD-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
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 4V
- Voltage Dropout (Max):
- 0.09V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 10 µA
- Current - Supply (Max):
- -
- PSRR:
- 48dB (1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x3)
MP2005DD-LF-Z FAQ
1.How can I place an order for MP2005DD-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2005DD-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 MP2005DD-LF-Z reliable?
The price and inventory of MP2005DD-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 MP2005DD-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2005DD-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2005DD-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2005DD-LF-Z?
MP2005DD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2005DD-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 MP2005DD-LF-Z?
For technical support, including MP2005DD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2005DD-LF-Z requirements.
6.How does Aetrix verify that MP2005DD-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2005DD-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 MP2005DD-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2005DD-LF-Z?
All MP2005DD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2005DD-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 MP2005DD-LF-Z part is unused and in its original packaging.
Return procedure for MP2005DD-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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