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Monolithic Power Systems Inc. MP20045DQ-18-LF-Z
- Part No.:
- MP20045DQ-18-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
MP20045DQ-18-LF-Z.pdf
- Description:
- IC REG LINEAR 1.8V 1A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,567
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Product details
Overview
MP20045DQ-18-LF-Z from Monolithic Power Systems is a fixed-output 1.8V, 1A low-dropout linear regulator with 140mV dropout at full load, 110μA ground current, and 13μVRMS output noise - designed for power-sensitive portable electronics requiring stable low-noise biasing of RF, analog, and digital subsystems.
For engineers reviewing the MP20045DQ-18-LF-Z datasheet, MP20045DQ-18-LF-Z pinout, MP20045DQ-18-LF-Z application, or MP20045DQ-18-LF-Z equivalent, key selection criteria include dropout voltage under 1A load, PSRR >55dB at 1kHz, thermal shutdown at 150°C, and QFN8 (3mm×3mm) package compatibility with high-density PCB layouts.
Technical Context
The MP20045DQ-18-LF-Z integrates an internal PMOS pass transistor enabling ultra-low dropout and minimal quiescent current. Its feedback loop uses a precise 1.5V reference with ±2.5% output voltage accuracy across temperature and line/load variations.
It features an open-drain power-good (PG) output asserting when VOUT reaches 90% of nominal, plus logic-level enable (EN) with 1.5V turn-on threshold and integrated hysteresis for reliable sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.5% - ensures stable core voltage for 1.8V I/O domains and low-power microcontrollers. |
| Max Output Current | 1A continuous - supports single-rail powering of baseband processors or RF transceivers without external pass devices. |
| Dropout Voltage | 140mV at 1A - enables operation down to VIN = 1.94V, critical for Li-ion battery discharge tail-end support. |
| Ground Current | 110μA at 100μA load - minimizes standby power loss in always-on sensor nodes and sleep-mode peripherals. |
| Output Noise | 13μVRMS (10Hz–100kHz) - meets stringent noise requirements for ADC references and RF LNA biasing. |
| PSRR | 56dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | 150°C with 20°C hysteresis - provides self-recovery protection during sustained overload or poor heatsinking. |
Pinout & Package
MP20045DQ-18-LF-Z is housed in an 8-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to GND for enhanced thermal performance (θJA = 50°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - VIN | Input supply rail | Accepts 2.5V–5.5V; requires 2.2μF ceramic bypass capacitor per pin for stability and EMI reduction. |
| 3, 4 - VOUT | Regulated output | Delivers fixed 1.8V; must be externally shorted and bypassed with 2.2μF low-ESR ceramic capacitor. |
| 5 - FB | Feedback input | Internally tied to output for fixed versions; unused but must remain connected to VOUT in MP20045DQ-18-LF-Z. |
| 6 - GND | Ground reference & thermal path | Exposed pad must be soldered to solid GND plane to maintain junction temperature ≤125°C at 1A. |
| 7 - PG | Open-drain power-good | Asserts low when VOUT drops below 1.62V (90% of 1.8V); requires external pull-up for system monitoring or sequencing. |
| 8 - EN | Enable control input | Active-high logic interface; 1.5V threshold allows direct connection to 1.8V/3.3V GPIO without level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 13μVRMS output noise enables clean power for precision analog circuits without additional filtering. |
| High PSRR | 56dB at 1kHz rejects ripple from switching regulators, reducing need for cascaded filtering stages. |
| Ultra-low quiescent current | 110μA ground current extends battery life in always-on wearables and IoT edge sensors. |
| Integrated protection | Current limiting (1.4–3.0A), thermal shutdown (150°C), and UVLO (2.3V) prevent fault propagation in compact systems. |
| Power-good signaling | Open-drain PG output provides deterministic system reset or supervisor handshaking without external comparators. |
Applications
| Cellular Phone Baseband Power | Wi-Fi/Bluetooth SoC Core Supply |
|---|---|
Use Scenario: Powers 1.8V I/O and memory interfaces in LTE/5G smartphone application processors during active transmission bursts. IC Role / Device Role / Timing Role: Low-noise post-regulator delivering stable 1.8V from a shared 3.3V buck converter rail. Use Value: 140mV dropout preserves headroom during battery voltage sag; 56dB PSRR prevents RF desense from switching noise coupling. | Use Scenario: Supplies 1.8V core voltage to dual-band Wi-Fi 6/Bluetooth 5.2 combo chips in portable hotspots and smart speakers. IC Role / Device Role / Timing Role: Primary LDO for RF transceiver digital core, synchronized via EN pin to radio activity state. Use Value: 110μA quiescent current minimizes standby drain; PG signal triggers MAC-layer wake-up confirmation. |
| Portable Medical Sensor Node | Industrial Handheld Scanner |
Use Scenario: Provides regulated 1.8V bias to low-power ADCs, op-amps, and BLE transceivers in battery-operated ECG patch monitors. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete LDO + supervisor + reset IC in space-constrained modules. Use Value: Integrated thermal shutdown prevents overheating in sealed enclosures; 13μVRMS noise avoids baseline drift in sub-μV biomedical signals. | Use Scenario: Powers 1.8V logic rails and image sensor interfaces in ruggedized barcode scanners used in warehouse logistics. IC Role / Device Role / Timing Role: High-reliability LDO with EN-controlled power cycling between scan events to conserve primary battery energy. Use Value: 1A rating supports brief peak currents during laser activation and CMOS image capture; SOIC8E alternative available for through-hole assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 1A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 1.8V fixed, 1A, 250mV dropout, 35μA IQ, SOT-25 package | Larger dropout limits use below 2.05V input; smaller package lacks thermal pad | Select for cost-sensitive, lower-current (<500mA) designs where board area is constrained and thermal load is light. |
| Analog Devices ADM7172ACPZ-1.8-R7 | 1.8V fixed, 2A, 175mV dropout, 300μA IQ, 10-lead LFCSP | Higher IQ and larger package; superior PSRR (70dB @ 1kHz) and transient response | Select when powering noise-sensitive PLLs or high-speed SerDes where PSRR >65dB is mandatory and 2A margin is required. |
Compared with XC6210B182MR-G, MP20045DQ-18-LF-Z delivers 44% lower dropout and integrated thermal pad for 2× higher power density; versus ADM7172ACPZ-1.8-R7, it trades 190μA higher IQ for 50% lower cost and QFN8 footprint compatibility with legacy layouts.
Availability
MP20045DQ-18-LF-Z is available at Aetrix Electronics and suitable for cellular phone baseband power, Wi-Fi/Bluetooth SoC core supply, and portable medical sensor node applications requiring stable component supply with RoHS-compliant, lead-free packaging.
Supply support for MP20045DQ-18-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 across Asia and North America.
The MP20045 belongs to MPS's low-noise LDO product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, high PSRR, and robust thermal protection in miniature packages.
FAQ
What is the minimum input voltage required for MP20045DQ-18-LF-Z to regulate 1.8V at 1A?
The minimum input voltage is 1.94V, calculated as VOUT + dropout = 1.8V + 0.14V. Below this, output voltage collapses; the device includes UVLO that disables regulation if VIN falls below 2.3V during startup or brownout.
Can MP20045DQ-18-LF-Z be used with ceramic output capacitors smaller than 2.2μF?
No - the datasheet specifies 2.2μF ceramic (ESR < 0.9Ω) as the minimum for guaranteed stability. Using smaller values risks oscillation due to phase margin degradation, especially under dynamic load conditions observed in mobile SoC applications.
How does the power-good (PG) pin behave during thermal shutdown?
During thermal shutdown, PG remains asserted (low) as long as VOUT stays above 1.62V. If thermal shutdown causes VOUT to dip below that threshold, PG deasserts (high-impedance). PG only reflects output voltage status, not internal fault conditions like overtemperature.
Is the EN pin internally pulled up, and what happens if left floating?
No internal pull-up exists. The EN pin has a 550kΩ–1.1MΩ internal pull-down resistor. Leaving it floating risks erratic enable/disable behavior due to noise coupling; it must be actively driven to ≥1.5V for ON or ≤0.4V for OFF, or tied to VIN for permanent operation.
Does MP20045DQ-18-LF-Z support reverse current blocking?
Yes - the internal PMOS pass transistor inherently blocks reverse current flow from VOUT to VIN when the device is disabled or VIN drops below VOUT, preventing backfeeding into upstream supplies and protecting battery-backed systems.
What is the maximum allowable power dissipation at 85°C ambient in the QFN8 package?
Using θJA = 50°C/W and TJ(MAX) = 125°C, maximum power dissipation is (125 − 85)/50 = 0.8W. At 1A load and 1.94V input, dissipation is (1.94 − 1.8) × 1 = 0.14W - well within limit. Higher input voltages require thermal derating per the datasheet's PD(MAX) equation.
MP20045DQ-18-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.28V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 110 µA
- Current - Supply (Max):
- -
- PSRR:
- 56dB (1kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MP20045DQ-18-LF-Z FAQ
1.How can I place an order for MP20045DQ-18-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP20045DQ-18-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 MP20045DQ-18-LF-Z reliable?
The price and inventory of MP20045DQ-18-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 MP20045DQ-18-LF-Z is usually 5 days.
3.What payment methods are accepted for MP20045DQ-18-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP20045DQ-18-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP20045DQ-18-LF-Z?
MP20045DQ-18-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP20045DQ-18-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 MP20045DQ-18-LF-Z?
For technical support, including MP20045DQ-18-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP20045DQ-18-LF-Z requirements.
6.How does Aetrix verify that MP20045DQ-18-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP20045DQ-18-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 MP20045DQ-18-LF-Z meets industry standards.
7.What is the process for return or replacement of MP20045DQ-18-LF-Z?
All MP20045DQ-18-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP20045DQ-18-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 MP20045DQ-18-LF-Z part is unused and in its original packaging.
Return procedure for MP20045DQ-18-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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