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Monolithic Power Systems Inc. MPQ4558DN-LF-Z
- Part No.:
- MPQ4558DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MPQ4558DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:13,072
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Product details
Overview
MPQ4558DN-LF-Z 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 regulated output voltages from 0.8V to 52V and is AEC-Q100 Grade 1 qualified for automotive power rails such as infotainment head units and ADAS camera modules.
For engineers reviewing the MPQ4558DN-LF-Z datasheet, MPQ4558DN-LF-Z pinout, MPQ4558DN-LF-Z application, or MPQ4558DN-LF-Z equivalent, key selection criteria include its 12µA shutdown current for battery backup systems, internal soft-start for inrush control, ceramic-capacitor compatibility, and thermal shutdown protection at 150°C junction temperature.
Technical Context
The MPQ4558DN-LF-Z operates in fixed-frequency peak-current mode above light load and transitions to pulse-skipping mode below ~100mA to maintain >85% efficiency down to 10µA load. Its error amplifier features 400V/V gain and 120µA/V transconductance, with COMP pin clamped between 0.9V and 2.0V during regulation.
Bootstrap charging relies on external BST–SW capacitor and internal 5V regulator; minimum off-time is 100ns and minimum on-time is 100ns, limiting practical duty-cycle range at 2MHz. UVLO thresholds are 2.7V (rising) and 2.4V (falling), with 0.35V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and interface ICs in distributed systems |
| Switching Frequency | Programmable up to 2MHz - enables compact magnetics and avoids AM radio band EMI |
| Quiescent Current | 140µA - ensures <10µW standby loss in always-on vehicle modules |
| Feedback Reference | 0.800V ±20mV - sets output accuracy to ±2.5% over temperature with standard resistor dividers |
| Shutdown Current | 12µA - preserves battery life in sleep-mode telematics and remote keyless entry systems |
| Thermal Shutdown | 150°C with 20°C hysteresis - provides fault-tolerant operation under sustained overload or poor PCB heatsinking |
Pinout & Package
MPQ4558DN-LF-Z is housed in an SOIC-8E package (3.9mm × 4.9mm × 1.75mm) with exposed thermal pad connected to Pin 5 (GND). The package supports 2.5W continuous power dissipation at TA = 25°C with θJA = 50°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Node | Drives external Schottky diode; requires low-inductance layout to minimize voltage spikes and EMI |
| 2 (EN) | Enable Input | Logic-level control with 1.4V rising threshold; internal 1µA pull-up allows floating-enable operation |
| 3 (COMP) | Error Amplifier Output | Interface for RC compensation network; clamped at 0.9V–2.0V to prevent loop saturation |
| 4 (FB) | Feedback Input | Senses output via resistive divider; 0.1µA leakage limits high-resistor bias errors |
| 5 (GND) | Power & Signal Ground | Exposed pad must be soldered to solid GND plane for thermal and noise performance |
| 6 (FREQ) | Frequency Programming | Resistor-to-GND sets fSW; 95kΩ yields 1MHz, enabling precise EMI tuning |
| 7 (VIN) | Main Supply Input | Accepts full 3.8V–55V range; requires local 4.7µF ceramic decoupling |
| 8 (BST) | Bootstrap Supply | Charges external BST–SW capacitor; internal 5V regulator sustains gate drive under high duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High-Side MOSFET | 250mΩ RDS(ON) at VGS=5V - eliminates external switch, reduces BOM count and layout area |
| AEC-Q100 Grade 1 Qualification | -40°C to +125°C operation - validated for engine bay and chassis-mounted automotive applications |
| Current-Mode Control | 5.7A/V transconductance - enables fast transient response (<10µs recovery) and stable loop with minimal compensation |
| Ceramic Capacitor Compatibility | No ESR requirement - supports low-profile, high-reliability MLCCs without stability risk |
| Internal Soft-Start | 0.19ms ramp time - prevents output overshoot and inrush current during cold start or reset |
Applications
| Automotive Infotainment Power | Industrial Sensor Hub Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and USB hub in 12V vehicle head units with stop-start operation. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/1A from unregulated 6V–16V battery rail. Use Value: 12µA shutdown current extends battery runtime during ignition-off; 55V abs max rating withstands load-dump transients. | Use Scenario: Supplies 5V to multi-sensor node (temperature, pressure, vibration) in factory automation PLC backplane. IC Role / Device Role / Timing Role: Point-of-load converter stepping down 24V field bus to isolated sensor analog front-end. Use Value: Wide 3.8V–55V input accommodates brownout and surge conditions; 2MHz switching minimizes filter size in space-constrained enclosures. |
| Telematics GPS Module Rail | ADAS Camera Core Voltage |
Use Scenario: Generates 1.8V for GNSS baseband processor in cellular-connected vehicle tracking units. IC Role / Device Role / Timing Role: Secondary buck stage regulating from intermediate 5V rail derived from main 12V input. Use Value: 0.8V feedback reference enables accurate low-voltage generation; 140µA IQ maintains GPS lock during sleep cycles. | Use Scenario: Provides stable 1.2V core supply to image signal processor in rear-view camera module. IC Role / Device Role / Timing Role: High-PSRR, low-noise buck converter operating at 2MHz to avoid interference with video clock harmonics. Use Value: Programmable frequency avoids critical 27MHz and 54MHz video bands; thermal shutdown protects against enclosure overheating. |
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-AEC1-LF-Z | Successor device with 2.5A output, 3.8V–60V input, lower 75mΩ RDS(ON), and improved light-load efficiency | Supports higher-power processors and FPGAs; replaces MPQ4558 where >1A load or tighter thermal margin required | Select when new design requires higher current headroom or extended input range beyond 55V |
| LM61480RQR | Texas Instruments part with 4.5V–36V input, 8A output, pin-compatible QFN, but no AEC-Q100 qualification | Targeted at industrial/commercial systems; lacks automotive reliability validation and extended temp support | Choose only for non-automotive applications needing higher current and TI ecosystem support |
Compared with MPQ4558DN-LF-Z, MPQ4571DQ-AEC1-LF-Z offers higher current and broader input range while maintaining AEC-Q100 compliance, whereas LM61480RQR trades automotive qualification for significantly higher output capability in commercial environments.
Availability
MPQ4558DN-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor hubs, and telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MPQ4558DN-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 MPQ4558 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for robustness in harsh environments-featuring AEC-Q100 qualification, wide input range, and integrated protection features for vehicle subsystems.
FAQ
What is the maximum recommended output current for MPQ4558DN-LF-Z in SOIC8E package at 85°C ambient?
The SOIC8E package has θJA = 50°C/W. At TA = 85°C and TJ(MAX) = 125°C, maximum allowable power dissipation is (125 − 85)/50 = 0.8W. With typical 88% efficiency at 12V→3.3V, this supports ~220mA continuous output current. Derating is required above 60°C ambient for full 1A operation; use QFN10 for higher thermal performance.
Can MPQ4558DN-LF-Z operate with input voltage below 3.8V?
No. Absolute minimum operating VIN is 3.8V per datasheet specifications. Below this, internal 2.6V regulator fails to power control circuitry, causing erratic behavior or failure to start. UVLO falling threshold is 2.4V, but functional operation is not guaranteed below 3.8V.
Is an external bootstrap diode required when operating at 2MHz?
Yes, for reliable operation at 2MHz with duty cycles >70%, an external Schottky diode (e.g., CMSH2-100M) from VIN to BST is recommended. Internal bootstrap charging may be insufficient due to reduced off-time, risking gate-drive collapse and MOSFET failure.
How does frequency fold-back improve short-circuit protection?
During output short, MPQ4558DN-LF-Z reduces switching frequency and lowers current limit to ~50% of nominal. This cuts power dissipation by >60%, preventing thermal runaway while maintaining detectable switching activity for fault diagnosis and auto-recovery upon fault removal.
What is the minimum output voltage achievable with MPQ4558DN-LF-Z?
The internal feedback reference is 0.800V ±20mV. With standard resistor divider tolerances (1%), the practical minimum regulated output is 0.8V. Lower outputs are not supported-the error amplifier cannot regulate below its reference voltage.
Does MPQ4558DN-LF-Z support synchronous rectification?
No. MPQ4558DN-LF-Z is a non-synchronous buck converter requiring an external Schottky diode. It lacks a low-side driver or control logic for synchronous MOSFET replacement. For synchronous operation, consider MPQ4571 or MPQ4572 series devices.
Why is MPQ4558DN-LF-Z marked "NOT RECOMMENDED FOR NEW DESIGNS"?
MPS issued this notice because MPQ4558 has been superseded by MPQ4571, which offers higher current (2.5A), wider input (60V), lower RDS(ON) (75mΩ), and improved light-load efficiency. MPQ4558 remains available for legacy support but receives no further development or qualification updates.
MPQ4558DN-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
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MPQ4558DN-LF-Z FAQ
1.How can I place an order for MPQ4558DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4558DN-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 MPQ4558DN-LF-Z reliable?
The price and inventory of MPQ4558DN-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 MPQ4558DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ4558DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4558DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4558DN-LF-Z?
MPQ4558DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4558DN-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 MPQ4558DN-LF-Z?
For technical support, including MPQ4558DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4558DN-LF-Z requirements.
6.How does Aetrix verify that MPQ4558DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4558DN-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 MPQ4558DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ4558DN-LF-Z?
All MPQ4558DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4558DN-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 MPQ4558DN-LF-Z part is unused and in its original packaging.
Return procedure for MPQ4558DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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