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Monolithic Power Systems Inc. MP20045DQ-LF-Z
- Part No.:
- MP20045DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
MP20045DQ-LF-Z.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:21,956
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Product details
Overview
MP20045DQ-LF-Z from Monolithic Power Systems is a low-noise, 1A adjustable-output LDO linear regulator with 140mV dropout at full load, 110μA ground current, and 13μVRMS output noise. It operates from 2.5V to 5.5V input and delivers stable output from 1.5V to 5V via external resistor divider. Designed for battery-powered handheld instruments and portable communications devices requiring ultra-low quiescent current and high PSRR.
For engineers reviewing the MP20045DQ-LF-Z datasheet, MP20045DQ-LF-Z pinout, MP20045DQ-LF-Z application, or MP20045DQ-LF-Z equivalent, key selection criteria include dropout voltage under 1A load, power-good status signaling, thermal shutdown threshold at 150°C, and compatibility with 2.2μF ceramic output capacitors.
Technical Context
The MP20045DQ-LF-Z uses an internal PMOS pass transistor enabling ultra-low dropout (140mV @ 1A) and minimal ground current (110μA). Its feedback architecture centers on a precise 1.5V reference at the FB pin, supporting both fixed and adjustable configurations.
It integrates open-drain power-good (PG) monitoring with 1.1–1.3V trip threshold, EN logic control (1.5V high/0.4V low), and robust protection: current limiting (1.4–3.0A), thermal shutdown (150°C, 20°C hysteresis), and UVLO (2.0–2.3V with 160mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports high-current rail in compact portable systems without thermal derating at ambient ≤85°C. |
| Dropout Voltage | 140mV @ 1A - enables regulation from 2.5V input down to 2.36V output, critical for single-cell Li-ion or Li-poly battery systems. |
| Ground Current | 110μA @ 100μA load - minimizes standby power loss, extending battery life in always-on sensor or communication modules. |
| Output Noise | 13μVRMS (10Hz–100kHz) - meets stringent analog/RF supply requirements in wireless LAN and cellular front-ends. |
| PSRR | 56dB @ 1kHz - suppresses switching noise from upstream DC/DC converters, preserving signal integrity in ADCs and RF ICs. |
| Power-Good Threshold | 1.1–1.3V below VOUT - provides accurate undervoltage detection for system-level sequencing and fault reporting. |
| EN Input Threshold | 1.5V logic-high / 0.4V logic-low - compatible with standard 1.8V/3.3V GPIOs without level-shifting. |
Pinout & Package
MP20045DQ-LF-Z is housed in an 8-pin QFN package (3mm × 3mm, exposed thermal pad). The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (θJA = 50°C/W, θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 VIN | Input Supply | Dual-input pins require external connection to 2.2μF input capacitor; internal connection not sufficient for thermal or current handling. |
| 3, 4 VOUT | Regulated Output | Dual-output pins must be externally tied together and bypassed with 2.2μF low-ESR ceramic capacitor to GND. |
| 5 FB | Feedback Input | Accepts 1.5V reference threshold; connects to resistor divider midpoint for adjustable versions (e.g., R1=8.66kΩ, R2=10kΩ for 2.8V). |
| 6 GND | Ground / Thermal Pad | Exposed pad is electrically and thermally connected to internal ground; must be soldered to large copper area for heat dissipation. |
| 7 PG | Open-Drain Power-Good | Active-low status signal pulled low when VOUT is within ±4% of target; requires external pull-up for logic interface. |
| 8 EN | Enable Control | Positive-enable input; floating prohibited-tie to VIN if always-on operation required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 140mV @ 1A enables operation from near-dead battery voltages (e.g., 2.5V input → 2.36V output), maximizing usable battery capacity. |
| Low-Noise Regulation | 13μVRMS output noise ensures clean power for sensitive analog circuits like RF transceivers and precision ADCs without additional filtering. |
| Integrated Power-Good | Open-drain PG pin provides real-time output health monitoring for system reset or firmware fault recovery without external comparators. |
| Thermal + Current Protection | Auto-recovering thermal shutdown (150°C, 20°C hysteresis) and foldback current limit prevent damage during overload or poor heatsinking. |
| Adjustable + Fixed Options | Single FB pin supports both preset (1.5V/1.8V/2.5V/5V) and externally set outputs (1.5–5V), reducing BOM variants across product families. |
Applications
| Hand-Held Instruments | Cordless Telephones |
|---|---|
|
Use Scenario: Portable multimeters and spectrum analyzers powered by single-cell Li-ion batteries with tight voltage margins. IC Role / Device Role / Timing Role: Primary 2.8V analog supply rail regulator with low noise and fast load transient response. Use Value: 13μVRMS noise prevents measurement floor elevation; 140mV dropout extends runtime by >12% compared to legacy 300mV-dropout LDOs. |
Use Scenario: Base station and handset subsystems requiring stable 3.3V or 2.5V rails for DSP, codec, and RF front-end ICs. IC Role / Device Role / Timing Role: Low-quiescent, enable-controlled power domain regulator for sleep/wake sequencing. Use Value: 110μA ground current reduces standby drain; PG signal synchronizes wake-up with valid supply, eliminating boot failures. |
| Cellular Phones | Modems |
|
Use Scenario: Application processor I/O or camera sensor bias rails where EMI-sensitive analog sections coexist with digital switching noise. IC Role / Device Role / Timing Role: Clean, PSRR-optimized local regulator decoupling noisy DC/DC outputs. Use Value: 56dB PSRR at 1kHz attenuates switcher ripple; 2.2μF ceramic compatibility enables space-constrained 0402/0603 layout. |
Use Scenario: DSL/cable modem line cards needing reliable 1.8V or 2.5V supplies for PHY and MAC controllers under variable thermal loads. IC Role / Device Role / Timing Role: Thermally robust, current-limited regulator with auto-recovery for unattended deployments. Use Value: Thermal shutdown + hysteresis prevents latch-up during sustained 1A loads; SOIC8E/QFN8 dual packaging supports cost vs. density trade-offs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 180mV dropout @ 1A, 25μA IQ, no PG pin, SOT-23-5 package | Lacks power-good monitoring and thermal hysteresis; limited to lower-power sub-1A applications | Select when board space is constrained and PG functionality is unnecessary; verify thermal margin at 1A continuous load. |
| Analog Devices ADM7172ACPZ-R7 | 175mV dropout @ 1A, 250μA IQ, 7μVRMS noise, 90dB PSRR @ 1kHz, 10-pin LFCSP | Higher PSRR and lower noise but higher quiescent current and cost; requires larger footprint | Prefer for ultra-high-precision analog systems where PSRR >80dB is mandatory and battery life is secondary. |
Compared with XC6210B182MR-G, MP20045DQ-LF-Z adds PG signaling and tighter thermal protection; versus ADM7172ACPZ-R7, it trades PSRR and noise performance for 2.3× lower ground current and 40% lower cost in volume production.
Availability
MP20045DQ-LF-Z is available at Aetrix Electronics and suitable for notebook computers, cordless telephones, and cellular phones requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed long-term continuity.
Supply support for MP20045DQ-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, motion control, and automotive applications.
The MP20045 belongs to MPS's low-noise LDO family, engineered specifically for portable and battery-powered systems demanding ultra-low dropout, minimal quiescent current, and integrated protection features.
FAQ
What is the minimum input voltage required for MP20045DQ-LF-Z to regulate a 2.5V output?
The minimum input is determined by dropout voltage plus output voltage: 2.5V + 0.14V = 2.64V. However, the absolute minimum input rating is 2.5V per datasheet, and UVLO engages at 2.0–2.3V, so stable regulation begins at ~2.64V with margin. Below that, output collapses.
Can MP20045DQ-LF-Z operate without an external feedback resistor divider?
No-the MP20045DQ-LF-Z is the adjustable version and requires an external resistor divider between VOUT and FB to set output voltage. Fixed versions (e.g., MP20045DQ-18) connect FB directly to VOUT; this part does not have internal resistors.
Is the exposed thermal pad on the QFN package electrically connected to GND?
Yes-the exposed pad is internally connected to the GND terminal (Pin 6) and must be soldered to a PCB ground plane. Failure to do so degrades thermal performance and risks thermal shutdown under 1A load.
How does the power-good (PG) pin behave during startup and dropout conditions?
PG goes high (open-drain pulled up) only when VOUT reaches and maintains ≥96% of target (e.g., ≥2.744V for 2.8V output). It pulls low during startup until regulation is achieved, and again if VOUT drops below trip threshold (1.1–1.3V below nominal) due to overload or input collapse.
What is the maximum allowable output capacitance for stability?
The MP20045DQ-LF-Z is stable with 2.2μF ceramic capacitors (ESR < 0.9Ω). Larger values (e.g., 10μF) improve transient response but require verification against ESR limits-Figure 2 shows stable region shrinks above ~500mA if ESR exceeds 0.3Ω.
Does MP20045DQ-LF-Z support reverse-voltage protection?
No-reverse input voltage (VIN < GND) is not protected. Absolute maximum rating is –0.3V at VIN. External reverse-polarity protection (e.g., series Schottky diode or MOSFET circuit) is required in systems prone to battery insertion errors or hot-swap events.
MP20045DQ-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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5V
- 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-LF-Z FAQ
1.How can I place an order for MP20045DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP20045DQ-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-LF-Z reliable?
The price and inventory of MP20045DQ-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-LF-Z is usually 5 days.
3.What payment methods are accepted for MP20045DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP20045DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP20045DQ-LF-Z?
MP20045DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP20045DQ-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-LF-Z?
For technical support, including MP20045DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP20045DQ-LF-Z requirements.
6.How does Aetrix verify that MP20045DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP20045DQ-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-LF-Z meets industry standards.
7.What is the process for return or replacement of MP20045DQ-LF-Z?
All MP20045DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP20045DQ-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-LF-Z part is unused and in its original packaging.
Return procedure for MP20045DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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