My Inquiry
My Account
Monolithic Power Systems Inc. MP4558DQ-LF-Z
- Part No.:
- MP4558DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4558DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP4558DQ-LF-Z from Monolithic Power Systems is a non-synchronous 1A step-down DC/DC converter with integrated 250mΩ high-side MOSFET, 3.8V–55V input range, 2MHz programmable switching frequency, and 0.8V–52V adjustable output voltage. It delivers stable power in automotive front-end supplies, industrial 24V/48V systems, and battery-powered equipment requiring low quiescent current (140μA) and EMI-sensitive layouts.
For engineers reviewing the MP4558DQ-LF-Z datasheet, MP4558DQ-LF-Z pinout, MP4558DQ-LF-Z application, or MP4558DQ-LF-Z equivalent, key selection criteria include its 2MHz operation for compact filter design, internal soft-start for inrush control, current-mode control for fast transient response, and QFN10 package thermal performance (θJA = 50°C/W).
Technical Context
The MP4558DQ-LF-Z implements peak-current-mode PWM control with an internal error amplifier (400V/V gain, 120μA/V transconductance), programmable oscillator (set via FREQ pin resistor), and cycle-by-cycle current limiting (1.9A typical). Its bootstrap driver charges the BST capacitor from VIN to SW during low-side conduction, enabling high-side MOSFET gate drive at up to 55V input.
It features under-voltage lockout (3.0V rising threshold, 0.35V hysteresis), thermal shutdown (150°C trip, 20°C hysteresis), and pulse-skipping mode at light load to maintain >90% efficiency down to 10mA. The COMP pin serves as both error amplifier output and loop compensation node, supporting pole-zero placement for stability across ceramic-output capacitor configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports direct connection to automotive batteries (12V/24V/48V) and industrial rails without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures. |
| Switching Frequency | Up to 2MHz - enables use of small 4.7µH–10µH inductors and reduces EMI in AM radio/ADSL bands. |
| Feedback Reference | 0.800V ±20mV - sets output voltage accuracy; allows precise 3.3V/5V/12V regulation with standard resistor dividers. |
| Quiescent Current | 140μA - extends battery life in always-on IoT nodes and telematics modules. |
| High-Side RDS(on) | 250mΩ - limits conduction loss at 1A, enabling >92% efficiency at 12V→5V conversion. |
| Shutdown Current | 12μA - ensures minimal leakage in sleep-mode systems with enable-controlled power sequencing. |
Pinout & Package
MP4558DQ-LF-Z uses a 3mm × 3mm, 10-pin QFN package with exposed thermal pad (pin 5), optimized for PCB heat dissipation (θJC = 12°C/W). Pin numbering follows standard QFN layout with pins 1–2 assigned to SW, pins 3–4 to EN/COMP, pin 5 to GND (exposed pad), pins 6–7 to FB/FREQ, pins 8–9 to VIN, and pin 10 to BST.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (SW) | Switch Node | Drives external Schottky diode; requires low-inductance routing to minimize voltage spikes and EMI. |
| 3 (EN) | Enable Input | Logic-level control (1.55V rising threshold); internal 1µA pull-up allows floating-enable operation. |
| 4 (COMP) | Error Amplifier Output | Interface for RC compensation network; clamped between 0.9V–2.0V to prevent saturation. |
| 5 (GND) | Ground / Thermal Pad | Must be soldered to large copper pour for thermal management and noise reduction. |
| 6 (FB) | Feedback Input | Senses output voltage divider; 0.1μA leakage enables high-resistor-ratio designs for low-power biasing. |
| 7 (FREQ) | Frequency Programming | Resistor-to-ground sets fSW; 95kΩ yields ~1MHz, enabling precise EMI band avoidance. |
| 8, 9 (VIN) | Power Input | Supplies control circuitry and high-side driver; requires local 4.7µF ceramic decoupling. |
| 10 (BST) | Bootstrap Supply | Charges via external capacitor to SW; mandates ≥2V headroom for reliable high-side gate turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft-Start | 0.5ms ramp time prevents output overshoot and inrush current during cold start or fault recovery. |
| Ceramic-Capacitor Stable | No external compensation required for 22µF–100µF X7R/X5R ceramics, simplifying BOM and layout. |
| Frequency Fold-Back | Reduces switching frequency under overload or short-circuit, limiting peak inductor current to ~50% of normal limit. |
| Thermal Shutdown Protection | Auto-recovery hysteresis (20°C) ensures safe restart after cooling, avoiding latch-up in enclosed enclosures. |
| Low Minimum On-Time | 100ns enables high-duty-cycle operation (e.g., 48V→12V at 2MHz) without pulse skipping artifacts. |
Applications
| Automotive Front-End Supply | Industrial 24V/48V Distribution |
|---|---|
Use Scenario: Powering infotainment head units and ADAS camera modules from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/3.3V from unregulated vehicle bus with UVLO (3.0V) and thermal robustness. Use Value: 55V absolute max input withstands load-dump transients; 2MHz switching avoids AM band interference in cabin audio systems. | Use Scenario: Point-of-load conversion in PLC backplanes and motor drive I/O modules operating from 24V or 48V rails. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down stage replacing discrete controllers + MOSFETs in space-constrained DIN-rail enclosures. Use Value: SOIC8E/QFN10 dual-package support enables footprint reuse; 250mΩ RDS(on) minimizes heat sink requirements at full 1A load. |
| Battery-Powered Telematics | EMI-Sensitive Communication Equipment |
Use Scenario: GPS trackers and cellular modems powered by Li-ion or lead-acid batteries with deep discharge capability. IC Role / Device Role / Timing Role: Main system supply with ultra-low IQ (140μA) and shutdown mode (12μA) to extend standby time beyond 3 months. Use Value: Wide 3.8V–55V range accommodates 1S–4S Li-ion packs and 12V lead-acid; internal soft-start prevents brownout during wake-up bursts. | Use Scenario: Powering Ethernet PHYs, DSL line cards, and RF front-ends where conducted EMI must avoid 0.5–3MHz bands. IC Role / Device Role / Timing Role: High-frequency buck converter synchronized to system clock to shift noise away from critical receive bands. Use Value: Programmable 2MHz operation places switching harmonics above AM radio (1.6MHz) and ADSL upstream (1.1MHz), reducing filtering cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4571DQ-LF-Z | Successor device with improved 1.2A current limit, lower 100μA IQ, and enhanced thermal performance (θJA = 45°C/W). | Recommended for new designs; supports same QFN10 footprint but requires updated compensation due to higher gm error amp. | Select when designing new products requiring longer lifecycle support and higher efficiency at light loads. |
| LM5164QDGQRQ1 | Automotive-grade 1A buck with 4.5V–65V input, integrated boot diode, and AEC-Q100 Grade 1 qualification. | Required for automotive safety-critical systems; adds spread-spectrum EMI reduction and enhanced fault reporting. | Choose for ASIL-B compliant applications where qualification and diagnostic coverage outweigh cost premium. |
Compared with MP4558DQ-LF-Z, MP4571DQ-LF-Z offers higher current capability and lower quiescent current while maintaining pin compatibility, whereas LM5164QDGQRQ1 provides automotive qualification and integrated boot diode at the expense of higher BOM count for non-automotive use.
Availability
MP4558DQ-LF-Z is available at Aetrix Electronics and suitable for automotive front-end supplies, industrial 24V/48V distribution, and battery-powered telematics requiring stable component supply through extended product lifecycles.
Supply support for MP4558DQ-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP45xx series targets high-input-voltage buck conversion for harsh environments, emphasizing wide VIN range, integrated power stages, and EMI-aware switching architecture for automotive and industrial markets.
FAQ
What is the maximum recommended output voltage for MP4558DQ-LF-Z?
The MP4558DQ-LF-Z supports output voltages up to 52V, set by the feedback resistor divider ratio against its 0.800V reference. This is validated per Absolute Maximum Ratings and Electrical Characteristics tables, where VOUT = 0.8V × (R1+R2)/R2. Operation above 52V risks violating internal comparator voltage limits and may cause regulation instability or damage.
Can MP4558DQ-LF-Z operate with a 2MHz switching frequency without external bootstrap diode?
Yes, MP4558DQ-LF-Z can operate at 2MHz without an external bootstrap diode under typical conditions where VIN ≥ 15V and duty cycle ≤ 75%, ensuring sufficient BST capacitor recharge time. However, at high duty cycles (e.g., 48V→12V) or low input voltages (<12V), adding an external Schottky diode (e.g., CMSH2-100M) between VIN and BST is recommended to guarantee reliable high-side gate drive.
Is MP4558DQ-LF-Z RoHS-compliant and lead-free?
Yes, MP4558DQ-LF-Z is RoHS-compliant and lead-free, as confirmed by the "-LF" suffix in its part number and MPS's public green status documentation. All packaging materials meet EU Directive 2011/65/EU requirements, and the device carries no exemptions for lead or other restricted substances.
How does the frequency fold-back function protect the MP4558DQ-LF-Z during startup?
During startup, frequency fold-back reduces the switching frequency when inductor current approaches the current limit, preventing magnetic saturation and excessive peak currents. This occurs before thermal shutdown triggers, allowing controlled soft-start even with undersized inductors or heavy capacitive loads, and is explicitly characterized in the Short-Circuit Protection section of the datasheet.
What is the minimum recommended output capacitor ESR for stable operation?
The MP4558DQ-LF-Z is designed to be stable with ceramic capacitors having near-zero ESR; no minimum ESR is required. In fact, high-ESR electrolytic or tantalum capacitors introduce a right-half-plane zero that degrades phase margin. For optimal performance, use X7R/X5R ceramics ≥22µF with <10mΩ effective series resistance at 2MHz.
Does MP4558DQ-LF-Z support synchronous rectification?
No, MP4558DQ-LF-Z is a non-synchronous buck converter and requires an external Schottky diode for freewheeling current path. It lacks a low-side MOSFET driver or control logic for synchronous operation. Synchronous alternatives like MPQ4571 require different pinouts and compensation schemes.
What is the thermal pad soldering requirement for QFN10 package reliability?
The exposed thermal pad (pin 5) must be soldered to a minimum 100mm² copper area with ≥4 thermal vias (0.3mm diameter, filled or capped) connecting to inner ground planes. Per JEDEC J-STD-020, reflow profile must achieve full wetting; insufficient pad soldering increases θJA beyond 50°C/W and risks thermal shutdown at 0.8A load.
MP4558DQ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP4558DQ-LF-Z FAQ
1.How can I place an order for MP4558DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4558DQ-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 MP4558DQ-LF-Z reliable?
The price and inventory of MP4558DQ-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 MP4558DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4558DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4558DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4558DQ-LF-Z?
MP4558DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4558DQ-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 MP4558DQ-LF-Z?
For technical support, including MP4558DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4558DQ-LF-Z requirements.
6.How does Aetrix verify that MP4558DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4558DQ-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 MP4558DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4558DQ-LF-Z?
All MP4558DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4558DQ-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 MP4558DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP4558DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP4558DQ-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…
