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Monolithic Power Systems Inc. MP20045DN-18-LF-Z
- Part No.:
- MP20045DN-18-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP20045DN-18-LF-Z.pdf
- Description:
- IC REG LINEAR 1.8V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,313
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Product details
Overview
MP20045DN-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 battery-powered handheld instruments and portable communication devices requiring stable low-noise voltage regulation.
For engineers reviewing the MP20045DN-18-LF-Z datasheet, MP20045DN-18-LF-Z pinout, MP20045DN-18-LF-Z application, or MP20045DN-18-LF-Z equivalent, key selection criteria include dropout voltage under 1A load, PSRR of 56dB at 1kHz, open-drain power-good signaling, thermal shutdown at 150°C, and SOIC8E package compatibility with standard PCB assembly processes.
Technical Context
The MP20045DN-18-LF-Z integrates an internal PMOS pass element to achieve ultra-low dropout and quiescent current, enabling operation from 2.5V to 5.5V input while maintaining regulated 1.8V output. Its feedback threshold is internally trimmed to 1.5V, eliminating external resistors in fixed-voltage configurations.
It features active protection circuitry including foldback current limiting (1.4–3.0A), thermal shutdown with 20°C hysteresis, and open-drain PG output that asserts low when VOUT drops below 80–86% of nominal. The EN pin supports logic-level enable/disable with 1.5V high-threshold and 0.4V low-threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.5% over 1mA–1A load and 2.5V–5.5V input - ensures stable core voltage for 1.8V I/O or low-power microcontrollers. |
| Dropout Voltage | 140mV at 1A load - enables regulation from 1.94V input, critical for single-cell Li-ion or Li-poly systems near end-of-discharge. |
| Ground Current | 110μA at 100μA load - minimizes standby power loss in always-on subsystems like real-time clocks or sensor wake logic. |
| Output Noise | 13μVRMS (10Hz–100kHz) - supports noise-sensitive analog circuits such as ADC references or RF front-end biasing. |
| PSRR | 56dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Power-Good Output | Open-drain PG with 1.1–1.3V trip threshold and 6% hysteresis - provides reliable system reset or sequencing control without external comparators. |
| Thermal Shutdown | Activates at TJ = 150°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
MP20045DN-18-LF-Z uses the SOIC8E (Small Outline Integrated Circuit, 8-pin, exposed pad variant) package measuring 4.90mm × 6.00mm × 1.75mm, with the exposed thermal pad on the bottom electrically and thermally connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (VOUT) | Regulated output node | Dual parallel pins reduce IR drop and improve current sharing; must be externally shorted and bypassed with ≥2.2μF low-ESR ceramic capacitor. |
| 3 (FB) | Feedback reference input | Internally tied to output for fixed 1.8V version; not user-accessible - eliminates resistor divider errors and layout sensitivity. |
| 4 (GND) | Power and signal ground | Exposed thermal pad (Pin 4) must be soldered to large PCB ground plane to maintain θJA ≤ 50°C/W and prevent thermal shutdown. |
| 5 (PG) | Open-drain power-good status | Pulls low when VOUT falls below 80–86% of 1.8V; requires external pull-up for MCU interrupt or sequencer input. |
| 6 (EN) | Enable control input | Logic-compatible: >1.5V enables regulator; <0.4V disables output and reduces supply current to 5–16μA. |
| 7, 8 (VIN) | Input supply connection | Dual parallel pins lower series impedance; require local 2.2μF ceramic decoupling close to pins to stabilize control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 13μVRMS output noise enables clean power for precision analog sensors and RF ICs without additional filtering. |
| PMOS-based architecture | Eliminates body diode conduction path, preventing reverse current flow during input collapse or hot-swap events. |
| Integrated power-good monitoring | PG output provides deterministic system-level power sequencing without external supervisor ICs or RC timing networks. |
| Low-quiescent-current shutdown | 5–16μA shutdown current extends battery life in sleep modes for portable medical or IoT edge devices. |
| Robust thermal protection | Auto-recovery thermal shutdown with 20°C hysteresis maintains safe junction temperature during transient overloads. |
Applications
| Hand-Held Instruments | Cordless Telephones |
|---|---|
Use Scenario: Portable multimeters and oscilloscopes operating from single Li-ion cells with dynamic load profiles. IC Role / Device Role / Timing Role: Primary 1.8V supply for microcontroller, display driver, and precision ADC reference. Use Value: 140mV dropout allows continuous operation down to 1.94V input, extending usable battery capacity by ~12% versus higher-dropout alternatives. | Use Scenario: Base station power management where EMI-sensitive audio paths coexist with digital processing. IC Role / Device Role / Timing Role: Low-noise 1.8V rail for codec and RF transceiver biasing, isolated from noisy SMPS inputs. Use Value: 13μVRMS noise and 56dB PSRR suppress switching artifacts that would otherwise degrade voice SNR below 45dB. |
| Cellular Phones | Modems |
Use Scenario: Subsystem power for SIM interface, NFC controller, or secure element in modern smartphones. IC Role / Device Role / Timing Role: Always-on 1.8V supply with fast EN response (<100μs startup) for secure boot and authentication sequences. Use Value: 110μA ground current minimizes leakage during deep sleep, contributing to <5μA system standby current targets. | Use Scenario: Embedded DSL/cable modems requiring reliable 1.8V for PHY layer logic and SerDes interfaces. IC Role / Device Role / Timing Role: Regulated supply for Ethernet MAC and packet buffer memory I/O banks. Use Value: PG output synchronizes firmware initialization with stable VOUT, preventing configuration lockup during cold start. |
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, 30μA IQ, no PG output | Lacks power-good signaling and has higher dropout - unsuitable for tight-input-margin designs | Select only if PG is unnecessary and input voltage margin exceeds 250mV. |
| Analog Devices ADP1740ACPZ-1.8-R7 | 1.8V fixed, 1A, 180mV dropout, 250μA IQ, PG output, 40μVRMS noise | Higher noise and quiescent current - compromises battery runtime and analog performance | Prefer only when ADI ecosystem integration or specific qualification requirements mandate its use. |
Compared with XC6210B182MR-G and ADP1740ACPZ-1.8-R7, MP20045DN-18-LF-Z uniquely balances ultra-low dropout (140mV), industry-leading noise (13μVRMS), and integrated PG functionality - making it optimal for space-constrained, battery-critical applications where both efficiency and signal integrity are non-negotiable.
Availability
MP20045DN-18-LF-Z is available at Aetrix Electronics and suitable for notebook computers, cordless telephones, cellular phones, modems, hand-held instruments, and PDA applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP20045DN-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 mixed-signal ICs for power management, motor drive, and automotive applications.
The MP20045 belongs to MPS's low-noise LDO product line, engineered specifically for portable and battery-powered systems demanding ultra-low dropout, minimal quiescent current, and high PSRR in compact SOIC8E and QFN packages.
FAQ
What is the minimum input voltage required for MP20045DN-18-LF-Z to regulate 1.8V at 1A?
The minimum input voltage is 1.94V, calculated as 1.8V + 140mV dropout. Below this, output voltage collapses linearly with input. Operation is guaranteed from VIN = 2.5V to 5.5V per datasheet specifications, but functional regulation begins at 1.94V under full load.
Does MP20045DN-18-LF-Z require an external feedback resistor network?
No. As a fixed-output variant, the FB pin is internally connected to VOUT. External resistors are unnecessary and must not be added - doing so disrupts regulation accuracy and may cause instability. Only adjustable versions (e.g., MP20045DN) require external dividers.
How does the power-good (PG) output behave during startup and fault conditions?
PG remains high-impedance until VOUT reaches ≥80% of 1.8V (~1.44V), then pulls low if VOUT drops below 80–86% during operation. During shutdown (EN low), PG goes high-impedance. It does not assert low during thermal shutdown unless VOUT collapses below threshold.
Can MP20045DN-18-LF-Z be used with ceramic output capacitors smaller than 2.2μF?
No. The device requires ≥2.2μF ceramic output capacitance with ESR <0.9Ω for stability. Using smaller values risks oscillation, especially under load transients. A 0.1nF capacitor across R3 in adjustable versions is optional; it is irrelevant for fixed 1.8V operation.
What is the thermal resistance (θJA) of the SOIC8E package under standard JEDEC 4-layer board conditions?
θJA is 50°C/W for the SOIC8E package when mounted on a JEDEC-standard 4-layer board per JESD51-7. This value assumes the exposed pad is fully soldered to a 1-in² copper pour. Without proper thermal pad connection, θJA degrades significantly, risking thermal shutdown above ~600mA continuous load.
Is MP20045DN-18-LF-Z compatible with lead-free reflow profiles?
Yes. The "-LF" suffix denotes RoHS-compliant, lead-free termination. It supports standard IPC/JEDEC J-STD-020D reflow profiles with peak temperature up to 260°C for 10 seconds. The SOIC8E package is rated for lead-free soldering per manufacturer specifications.
MP20045DN-18-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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-SOICE
MP20045DN-18-LF-Z FAQ
1.How can I place an order for MP20045DN-18-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP20045DN-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 MP20045DN-18-LF-Z reliable?
The price and inventory of MP20045DN-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 MP20045DN-18-LF-Z is usually 5 days.
3.What payment methods are accepted for MP20045DN-18-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP20045DN-18-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP20045DN-18-LF-Z?
MP20045DN-18-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP20045DN-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 MP20045DN-18-LF-Z?
For technical support, including MP20045DN-18-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP20045DN-18-LF-Z requirements.
6.How does Aetrix verify that MP20045DN-18-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP20045DN-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 MP20045DN-18-LF-Z meets industry standards.
7.What is the process for return or replacement of MP20045DN-18-LF-Z?
All MP20045DN-18-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP20045DN-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 MP20045DN-18-LF-Z part is unused and in its original packaging.
Return procedure for MP20045DN-18-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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