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Monolithic Power Systems Inc. MPQ4558DN-LF-P
- Part No.:
- MPQ4558DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MPQ4558DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
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Product details
Overview
MPQ4558DN-LF-P from Monolithic Power Systems is a non-synchronous, current-mode step-down DC/DC converter with integrated 250mΩ high-side MOSFET, 3.8V–55V input range, 1A output capability, and programmable 2MHz switching frequency. It delivers up to 95% efficiency, features internal soft-start, AEC-Q100 Grade 1 qualification, and targets automotive power rails and industrial high-voltage point-of-load conversion.
For engineers reviewing the MPQ4558DN-LF-P datasheet, MPQ4558DN-LF-P pinout, MPQ4558DN-LF-P application, or MPQ4558DN-LF-P equivalent, key selection criteria include its 12µA shutdown current, 0.8V feedback reference, 100ns minimum on-time, thermal shutdown at 150°C, and QFN10 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The MPQ4558DN-LF-P implements peak-current-mode control with a transconductance error amplifier (120µA/V), COMP pin-based loop compensation, and programmable oscillator via external FREQ resistor. Its internal bootstrap regulator maintains ~5V gate drive for the high-side MOSFET, with UVLO protection (2.2V rising threshold) and 20µs delay on bootstrap reset.
It operates in fixed-frequency PWM mode under medium-to-heavy load and transitions to pulse-skipping mode at light load to reduce quiescent current (140µA typical). Short-circuit protection includes frequency fold-back and current limit reduction to ~50% when FB = 0V, while startup sequencing enforces 50µs blanking and controlled soft-start ramp (0.19–0.5ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports direct connection to automotive battery (12V/24V/48V systems) and industrial HV rails without pre-regulation. |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures. |
| Switching Frequency | Programmable up to 2MHz - enables compact magnetics and avoids AM radio band EMI; limited by 100ns min on-time. |
| Feedback Reference | 0.800V ±20mV - sets precise output regulation; allows adjustable VOUT from 0.8V to 52V using external resistor divider. |
| Quiescent Current | 140µA - ensures low standby power draw in always-on automotive modules and battery-backed systems. |
| Shutdown Current | 12µA - minimizes battery drain during system sleep modes; enabled via EN pin with 1.4–1.7V rising threshold. |
| Thermal Shutdown | 150°C with 20°C hysteresis - provides fault-tolerant operation and automatic recovery without latch-up. |
Pinout & Package
MPQ4558DN-LF-P is housed in a RoHS-compliant, thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 5) connected to GND for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drain of internal high-side MOSFET; connects to inductor and Schottky rectifier cathode; requires low-inductance layout to minimize ringing. |
| 3 EN | Enable Input | Logic-level control pin; internal 1µA pull-up enables chip when floating; 1.4–1.7V rising threshold ensures noise-immune startup. |
| 4 COMP | Compensation Output | Error amplifier output; connects to RC network for loop stability; clamped between 0.9V and 2.0V during operation. |
| 5 FB | Feedback Input | Senses output voltage via resistive divider; compares to 0.8V internal reference to regulate VOUT with ±2.5% accuracy over temperature. |
| 6 GND | Ground / Exposed Pad | Power and signal ground; exposed pad must be soldered to PCB GND plane for thermal and EMI performance. |
| 7 FREQ | Frequency Programming | Connects external resistor to GND to set fSW; 95kΩ yields ~1MHz; supports 0.7–1.3MHz range per datasheet. |
| 8, 9 VIN | Input Supply | Primary power input; accepts full 3.8–55V range; requires local 4.7µF ceramic decoupling capacitor near pin. |
| 10 BST | Bootstrap Supply | Supplies gate drive for high-side MOSFET; requires 0.1µF ceramic capacitor between BST and SW pins. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 Qualification | Rated for –40°C to +125°C junction temperature - validated for automotive powertrain and body electronics applications. |
| Integrated 250mΩ High-Side MOSFET | Reduces BOM count and PCB area; eliminates need for external high-voltage switch and associated gate driver circuitry. |
| Stable with Ceramic Output Capacitors | Eliminates reliance on high-ESR electrolytics - simplifies design, improves reliability, and reduces output ripple in space-constrained layouts. |
| Internal Soft-Start (0.19–0.5ms) | Prevents output overshoot and inrush current during power-up and short-circuit recovery - critical for protecting downstream logic and analog circuits. |
| Frequency Fold-Back Under Fault | Reduces short-circuit current and thermal stress during output faults - enhances system robustness without external current-limiting components. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers 3.3V or 5V logic supplies in head-unit mainboards where input varies from 9V–16V (cold crank) to 42V (load dump). IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering regulated low-noise supply to SoC, audio codecs, and display drivers. Use Value: 2MHz operation avoids AM band interference; AEC-Q100 qualification ensures reliability across automotive temperature and vibration profiles. | Use Scenario: Generates isolated 12V or 24V auxiliary rail from 48V industrial bus in programmable logic controller backplanes. IC Role / Device Role / Timing Role: High-input-voltage step-down converter supplying field I/O conditioning circuits and communication interfaces (RS-485, CAN transceivers). Use Value: 55V absolute max input withstands transient surges; 140µA quiescent current extends uptime in energy-conscious automation nodes. |
| Battery-Powered Telematics Unit | Distributed Telecom Power System |
Use Scenario: Powers GPS/GSM module and MCU in vehicle tracking devices powered by Li-ion (3.6V–4.2V) or lead-acid (10V–14.4V) batteries. IC Role / Device Role / Timing Role: Efficient buck converter operating across wide VIN range with ultra-low shutdown current to maximize battery life. Use Value: 12µA shutdown current preserves battery charge during extended idle periods; internal soft-start prevents brown-out during wake-up events. | Use Scenario: Provides 5V/1A intermediate rail in remote radio head (RRH) or small-cell base station powered from 48V telecom rectifier. IC Role / Device Role / Timing Role: Point-of-load regulator feeding FPGA configuration, clock buffers, and RF front-end bias supplies. Use Value: Compact QFN10 footprint saves board space; stable ceramic-capacitor operation simplifies filtering in high-density RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4571DQ-LF-Z | Successor device with improved 2.5A output, lower RDS(ON) (120mΩ), higher efficiency, and same 3.8–55V input range. | Supports higher load currents and tighter thermal constraints; retains pin compatibility with MPQ4558DN-LF-P in QFN10 package. | Select for new designs requiring >1A output or better thermal margin; not drop-in due to different COMP compensation behavior. |
| LM5164QPWPRQ1 | TI part with 1A rating, 3–65V input, 1.5MHz max fSW, and integrated bootstrap diode - no external BST cap required. | Eliminates external bootstrap capacitor but lacks AEC-Q100 Grade 1 rating; uses SO PowerPAD package instead of QFN. | Consider only if AEC-Q100 is not mandatory and layout simplicity outweighs qualification requirements. |
Compared with MPQ4558DN-LF-P, MPQ4571DQ-LF-Z offers higher current capability and efficiency for next-gen automotive designs, while LM5164QPWPRQ1 trades qualification for integrated bootstrap convenience in non-automotive industrial use cases.
Availability
MPQ4558DN-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and battery-powered telematics units requiring stable component supply and long-term lifecycle support.
Supply support for MPQ4558DN-LF-P 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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ45xx product line delivers high-voltage, high-efficiency buck converters optimized for automotive and industrial applications where wide input range, AEC-Q100 compliance, and compact thermal packaging are essential.
FAQ
What is the recommended input capacitor for MPQ4558DN-LF-P?
Use a 4.7µF X7R ceramic capacitor placed as close as possible to VIN and GND pins, supplemented by a bulk capacitor (e.g., 10–22µF tantalum or low-ESR electrolytic) if RMS input current exceeds 0.5× load current. The ceramic cap suppresses high-frequency switching noise, while the bulk cap handles low-frequency ripple.
Can MPQ4558DN-LF-P operate with an output voltage below 0.8V?
No - the internal feedback reference is fixed at 0.800V ±20mV, and the FB pin is designed to sense a divided version of VOUT. Output voltages below 0.8V cannot be regulated; the minimum achievable VOUT is 0.8V (achieved with FB tied directly to GND, though not recommended due to lack of regulation margin).
Why does MPQ4558DN-LF-P require an external bootstrap diode at 2MHz?
At 2MHz, the off-time (tOFF) shrinks significantly, reducing the window for bootstrap capacitor recharge via the internal PMOS path. An external Schottky diode (e.g., CMSH2-100M) from VIN to BST ensures reliable charging during each cycle, preventing gate drive undervoltage and MOSFET failure.
Is MPQ4558DN-LF-P pin-compatible with MPQ4558DN (SOIC8E)?
No - MPQ4558DN-LF-P uses a 10-pin QFN package with different pin count, layout, and thermal pad, while MPQ4558DN uses an 8-pin SOIC8E. They share functional equivalence but require separate PCB footprints and layout optimization for thermal and EMI performance.
What happens during thermal shutdown, and how does recovery work?
When junction temperature exceeds 150°C, the device disables the high-side MOSFET and pulls COMP low. Once die temperature falls below 130°C (20°C hysteresis), soft-start resumes automatically. No external reset is needed, but repeated cycling indicates insufficient heatsinking or excessive ambient temperature.
How is output voltage adjusted, and what tolerance should be expected?
VOUT is set by an external resistor divider from output to FB, using VOUT = 0.8V × (1 + R1/R2). With 1% resistors and considering ±2.5% FB reference tolerance, total output tolerance is typically ±3.5% over temperature and line/load conditions.
Does MPQ4558DN-LF-P support synchronous rectification?
No - it is a non-synchronous buck converter requiring an external Schottky diode for freewheeling current path. Synchronous operation would require a second actively controlled switch, which MPQ4558DN-LF-P does not integrate or support via control signals.
MPQ4558DN-LF-P 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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 52V
- Current - Output:
- 1A
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MPQ4558DN-LF-P FAQ
1.How can I place an order for MPQ4558DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4558DN-LF-P 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 MPQ4558DN-LF-P reliable?
The price and inventory of MPQ4558DN-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4558DN-LF-P is usually 5 days.
3.What payment methods are accepted for MPQ4558DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4558DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4558DN-LF-P?
MPQ4558DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4558DN-LF-P 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 MPQ4558DN-LF-P?
For technical support, including MPQ4558DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4558DN-LF-P requirements.
6.How does Aetrix verify that MPQ4558DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MPQ4558DN-LF-P 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 MPQ4558DN-LF-P meets industry standards.
7.What is the process for return or replacement of MPQ4558DN-LF-P?
All MPQ4558DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4558DN-LF-P, 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 MPQ4558DN-LF-P part is unused and in its original packaging.
Return procedure for MPQ4558DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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