My Inquiry
My Account
Monolithic Power Systems Inc. MPQ4558DQ-AEC1-LF-Z
- Part No.:
- MPQ4558DQ-AEC1-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MPQ4558DQ-AEC1-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPQ4558DQ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, non-synchronous step-down DC/DC converter with integrated 250mΩ high-side MOSFET, 3.8V–55V input range, 1A output current, and programmable 2MHz switching frequency. It delivers stable 0.8V–52V adjustable output in automotive body control modules requiring high-voltage transient tolerance and low quiescent current.
For engineers reviewing the MPQ4558DQ-AEC1-LF-Z datasheet, MPQ4558DQ-AEC1-LF-Z pinout, MPQ4558DQ-AEC1-LF-Z application, or MPQ4558DQ-AEC1-LF-Z equivalent, key selection criteria include its 140μA quiescent current, 12μA shutdown current, internal soft-start, ceramic-capacitor compatibility, and thermal shutdown with 20°C hysteresis - all critical for battery-backed automotive subsystems.
Technical Context
The MPQ4558DQ-AEC1-LF-Z implements peak-current-mode control with a 12μA shutdown supply current and programmable oscillator (via external FREQ resistor) enabling precise 2MHz operation. Its internal error amplifier features 400V/V gain and 120μA/V transconductance, supporting fast loop response and stable regulation across wide VIN and load ranges.
It integrates a bootstrap regulator for high-side gate drive, with dedicated UVLO (2.2V rising threshold, 150mV hysteresis) and cycle-by-cycle current limiting (1.9A typical ILIM). Short-circuit protection includes frequency fold-back and current limit reduction to ~50% when FB = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports direct connection to automotive battery (12V/24V systems) with cold-crank and load-dump tolerance. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in distributed ECUs. |
| Switching Frequency | Up to 2MHz - enables compact magnetics and avoids AM radio band interference; minimum on-time 100ns limits practical duty-cycle at high VIN. |
| Quiescent Current | 140μA - ensures minimal battery drain during vehicle sleep mode without compromising startup time. |
| Feedback Reference | 0.800V ±20mV - sets output voltage accuracy; allows precise 3.3V/5V rails using standard 1% resistors. |
| Internal MOSFET RDS(on) | 250mΩ max - reduces conduction loss at 1A, enabling >90% efficiency at mid-load in 12V→3.3V conversion. |
| Thermal Shutdown | 150°C junction, 20°C hysteresis - provides fault-tolerant operation under sustained overload or poor PCB thermal design. |
Pinout & Package
MPQ4558DQ-AEC1-LF-Z uses a 10-pin 3mm × 3mm QFN package with exposed thermal pad (pin 5), optimized for automotive thermal cycling and board space constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - SW | Switch Node | Drives external Schottky diode; requires low-inductance layout to minimize EMI and voltage spikes during MOSFET turn-off. |
| 3 - EN | Enable Input | Logic-level control (1.55V rising threshold); internal 1µA pull-up allows floating-enable; supports system-level power sequencing. |
| 4 - COMP | Error Amplifier Output | Interface for Type II/III compensation network; clamped between 0.9V–2.0V to prevent saturation and ensure stable loop dynamics. |
| 5 - FB | Feedback Input | Senses output via resistive divider; 0.1μA leakage ensures minimal voltage divider error at high-impedance settings. |
| 6 - GND | Power & Signal Ground | Exposed pad must be soldered to solid ground plane for thermal dissipation (θJA = 50°C/W) and noise immunity. |
| 7 - FREQ | Frequency Programming | Connects to GND via resistor (e.g., 95kΩ for 1MHz); enables EMI optimization by shifting switching spectrum away from sensitive bands. |
| 8 - VIN | Main Power Input | Supplies control circuitry and high-side driver; requires local 4.7μF ceramic decoupling to suppress high-frequency ripple. |
| 9, 10 - BST | Bootstrap Supply | Charges via external capacitor to SW node; enables floating gate drive for integrated high-side MOSFET; requires ≥2.2V to avoid UVLO reset. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation - meets automotive ECU reliability requirements without derating. |
| Programmable 2MHz switching | Enables use of small 4.7μH inductors and 22μF ceramic output capacitors - reduces solution size by >40% vs. 500kHz designs. |
| 12μA shutdown current | Extends battery life in always-on modules (e.g., telematics, alarm systems) during extended vehicle park time. |
| Stable with ceramic output capacitors | Eliminates need for tantalum or polymer caps - improves long-term reliability and reduces BOM cost and footprint. |
| Internal soft-start (0.5ms typical) | Prevents output overshoot and inrush current during cold-start or recovery from short-circuit events. |
Applications
| Automotive Body Control Module | Industrial Sensor Hub |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors in centralized body controller. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting 12V battery rail under load-dump conditions (up to 55V). Use Value: 55V absolute max rating and thermal shutdown protect against ISO 7637-2 pulse 5a/b transients; 140μA IQ extends module sleep duration. | Use Scenario: Supplying isolated analog front-ends and low-power MCUs in factory-floor vibration sensors. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering stable 3.3V from 24V industrial bus with wide temperature operation. Use Value: 125°C max junction temperature and SOIC8E/QFN10 packaging support conformal coating and harsh-environment mounting. |
| Battery-Powered Telematics Unit | Distributed Power System |
Use Scenario: Providing regulated 3.3V for GPS/GSM modules and flash memory in OBD-II dongles. IC Role / Device Role / Timing Role: Always-on power manager with ultra-low IQ and fast wake-up from shutdown via EN pin. Use Value: 12μA shutdown current minimizes parasitic drain on 12V lead-acid backup; soft-start prevents brownout during cellular transmission bursts. | Use Scenario: Generating auxiliary 5V rail for CAN FD transceivers and EEPROMs in multi-rail automotive domain controllers. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main 12V-to-5V converter, handling dynamic load steps up to 1A. Use Value: Current-mode control and 2MHz operation deliver <50μs load transient response; FB accuracy ±2.5% ensures CAN bus VIO stability. |
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: 2.5A output, 3.8V–60V input, 2.2MHz max, 20μA IQ, integrated high/low-side MOSFETs. | Supports higher current loads (e.g., ADAS camera modules); eliminates external Schottky diode. | Select for new designs requiring higher efficiency, lower BOM count, and extended input range. |
| LM61480QRNXTQ1 | TI part: 8A output, 3.0V–36V input, 2.1MHz, 15μA IQ, integrated FETs, spread-spectrum EMI reduction. | Targeted at higher-power ADAS domains; not rated for >55V transients or AEC-Q100 Grade 1 temp range. | Consider only if input voltage stays ≤36V and thermal margin exceeds 125°C junction requirement. |
Compared with MPQ4558DQ-AEC1-LF-Z, MPQ4571DQ-AEC1-LF-Z offers higher current capability and synchronous rectification for improved light-load efficiency, while LM61480QRNXTQ1 provides superior EMI performance but lacks the 55V transient robustness required for direct-battery automotive applications.
Availability
MPQ4558DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and battery-powered telematics requiring stable component supply despite its "Not Recommended for New Designs" status.
Supply support for MPQ4558DQ-AEC1-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ4558 belongs to MPS's automotive-grade buck converter product line, designed specifically for reliable, high-voltage power conversion in harsh-temperature automotive environments where AEC-Q100 compliance and transient robustness are mandatory.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MPQ4558DQ-AEC1-LF-Z?
This designation indicates MPS has superseded the MPQ4558 with the MPQ4571, which offers higher current, synchronous operation, and improved efficiency. However, MPQ4558DQ-AEC1-LF-Z remains fully qualified, in active production, and supported for legacy designs and existing production ramps through Aetrix Electronics' lifecycle management program.
Can MPQ4558DQ-AEC1-LF-Z operate with input voltages above 55V?
No. The absolute maximum input voltage is 60V, but the recommended operating range is strictly 3.8V to 55V per datasheet specifications. Exceeding 55V risks violating safe operating area limits and may trigger overvoltage stress during transients, even if within the 60V absolute max rating.
Why does MPQ4558DQ-AEC1-LF-Z require an external Schottky diode?
It is a non-synchronous buck converter with only an integrated high-side MOSFET. The external Schottky diode provides the return path for inductor current during the low-side conduction phase. Using a low-VF, fast-recovery Schottky (e.g., B380-13-F) minimizes conduction loss and improves efficiency at light loads.
How is the 2MHz switching frequency set on MPQ4558DQ-AEC1-LF-Z?
The FREQ pin connects to GND via an external resistor (RFREQ). For 2MHz operation, RFREQ ≈ 50kΩ (calculated using RFREQ(kΩ) = 100000 / fSW(kHz)). This resistor sets oscillator timing; deviation beyond ±5% shifts frequency and affects EMI profile and inductor sizing.
Is the exposed thermal pad on the QFN package electrically connected?
Yes - the exposed pad (pin 5) is internally connected to GND and must be soldered to a PCB ground plane. It serves dual functions: thermal dissipation (reducing θJA by ~20°C/W) and electrical grounding for noise suppression. Failure to connect it degrades thermal performance and increases EMI susceptibility.
Does MPQ4558DQ-AEC1-LF-Z support output voltages below 0.8V?
No. The internal feedback reference is fixed at 0.800V ±20mV. Output voltage is set by VOUT = 0.8V × (1 + R1/R2), so the minimum achievable output equals the reference voltage when R1 = 0Ω - i.e., 0.8V. Lower outputs require external reference injection or a different controller architecture.
What is the purpose of the BST pin, and how is the bootstrap capacitor sized?
BST supplies gate drive voltage to the internal high-side MOSFET. A 0.1μF X7R ceramic capacitor is placed between BST and SW. Its value ensures sufficient charge storage for gate drive during each switching cycle; undersizing causes bootstrap UVLO (2.2V threshold), leading to intermittent dropout or thermal shutdown.
MPQ4558DQ-AEC1-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MPQ4558DQ-AEC1-LF-Z FAQ
1.How can I place an order for MPQ4558DQ-AEC1-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4558DQ-AEC1-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 MPQ4558DQ-AEC1-LF-Z reliable?
The price and inventory of MPQ4558DQ-AEC1-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 MPQ4558DQ-AEC1-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ4558DQ-AEC1-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4558DQ-AEC1-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4558DQ-AEC1-LF-Z?
MPQ4558DQ-AEC1-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4558DQ-AEC1-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 MPQ4558DQ-AEC1-LF-Z?
For technical support, including MPQ4558DQ-AEC1-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4558DQ-AEC1-LF-Z requirements.
6.How does Aetrix verify that MPQ4558DQ-AEC1-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4558DQ-AEC1-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 MPQ4558DQ-AEC1-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ4558DQ-AEC1-LF-Z?
All MPQ4558DQ-AEC1-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4558DQ-AEC1-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 MPQ4558DQ-AEC1-LF-Z part is unused and in its original packaging.
Return procedure for MPQ4558DQ-AEC1-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ4558DQ-AEC1-LF-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
