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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP4575GF-P

Name: MP4575GF-P
Brand: Monolithic Power Systems Inc.
SKU: MP4575GF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4575GF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 20-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: MP4575GF-P.pdf

Description:: IC REG BUCK ADJ 5A 20TSSOP

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Product details

Overview

MP4575GF-P from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 90mΩ high-side and 70mΩ low-side MOSFETs, delivering up to 5A continuous output current across a 4.5V–55V input range. It employs peak-current-mode control, supports programmable switching frequency (400–640 kHz), and integrates OCP with valley current detection, OVP, thermal shutdown, and power-good indication - optimized for PoE-powered industrial systems and automotive DC bus supplies.

For engineers reviewing the MP4575GF-P datasheet, MP4575GF-P pinout, MP4575GF-P application, or MP4575GF-P equivalent, key selection criteria include its wide VIN range, internal MOSFET R_DS(on) values, frequency-programmability via FREQ pin, valley-based OCP architecture, and BIAS-supplied VDD regulation for improved light-load efficiency.

Technical Context

The MP4575GF-P uses peak-current-mode control with an internal error amplifier (transconductance: 380–720 µA/V) and a programmable oscillator set by an external resistor on FREQ. Its PWM cycle initiates on internal clock edges, with minimum on/off times of 90 ns and 100 ns respectively, and includes automatic frequency scaling below 0.8V COMP voltage to reduce switching loss at light load.

It implements dual-stage over-voltage protection: soft shutdown at 108–122% V_FB and hard latch at >110% V_FB; OCP combines cycle-by-cycle peak limiting (5.5–11 A) with valley current detection to prevent runaway during short-circuit events; BIAS pin enables optional 5V external supply to raise VDD to 4.8V and improve thermal performance under high load.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 55V - supports direct connection to PoE+ (57V), automotive battery (12V/24V/48V), and industrial DC bus rails without pre-regulation.
Output Current	5A continuous - sustained at full load with TSSOP-20 EP package and exposed pad thermal path (θ_JA = 45°C/W).
Switching Frequency	400–640 kHz (typ.) - set by external resistor on FREQ pin; scalable down to 5% nominal frequency under light load to maintain efficiency.
Internal MOSFETs	90mΩ HS / 70mΩ LS - enables high-efficiency synchronous operation without external drivers or discrete switches.
Feedback Reference	1.0V ±2% - precision reference used with external resistor divider to set output voltage from 1V to 0.9×VIN.
OVP Threshold	108–122% of V_FB - triggers auto-recovery shutdown before output overstress damages downstream circuitry.
Power Good Window	81–94% of V_FB - provides accurate sequencing signal with 5% hysteresis for reliable system power monitoring.

Pinout & Package

The MP4575GF-P is housed in a thermally enhanced TSSOP-20 EP package with exposed pad (pins 13, 14, 15, and exposed pad tied to GND), supporting high-power dissipation in compact industrial and automotive layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 COMP	Error amplifier compensation node	Connects external RC network to stabilize loop response; sets bandwidth and phase margin for transient performance.
2 FB	Output voltage feedback input	Senses divided output voltage; compares to 1.0V reference to regulate VOUT with ±2% accuracy.
3 FREQ	Frequency programming / SYNC input	Resistor-to-GND sets fSW; accepts external 100–1000 kHz clock for system-level synchronization.
4 EN	Enable control input	Active-high logic (1.4–1.8V threshold); no internal pull-up - requires defined drive to avoid floating state.
5 BST	Bootstrap supply for high-side driver	Connects 0.1µF capacitor to SW; powers floating gate driver; regulated to 4.2V internally.
6,7,8 VIN	Main input power supply	Accepts 4.5–55V; powers internal regulator, VDD, and high-side switch; requires local ceramic decoupling.
9,12 NC	No connection	Must remain unconnected; no internal circuitry attached.
10,11 SW	Switch node	Drives external inductor; connects to BST capacitor; carries high di/dt - layout critical for EMI control.
13,14,15, EP	Power ground	Primary return path for high-side/low-side MOSFET currents; exposed pad must be soldered for thermal performance.
16 VDD	Driver and bootstrap supply rail	Internally regulated to 3.6V (from VIN) or 4.8V (from BIAS ≥5.4V); powers gate drivers and BST charging circuit.
17 BIAS	Optional auxiliary supply input	When connected to 3.3–5.5V, powers internal circuits directly - reduces power loss and improves thermal headroom.
18 PG	Open-drain power-good indicator	Asserts high after VOUT reaches 90% of target; pulls low if VOUT drops below 85% - enables safe system sequencing.
19 SS	External soft-start timing node	Charged by 4µA current; overrides internal reference during startup to limit inrush; supports adjustable t_SS.
20 AGND	Analog ground reference	Separate ground for error amplifier and feedback circuitry; must be routed away from power ground noise.

Key Features

Feature	Design Value
Programmable switching frequency	Set via single resistor on FREQ pin (400–640 kHz typical); enables EMI optimization and avoids sensitive frequency bands.
Valley-current-detection OCP	Detects inductor valley current to prevent runaway during output short - reduces thermal stress and improves fault recovery.
BIAS-supplied VDD regulation	Accepts external 3.3–5.5V on BIAS pin to raise VDD to 4.8V, lowering driver losses and improving efficiency above 2A load.
Auto-frequency scaling	Reduces fSW proportionally as VCOMP falls below 0.8V - cuts switching loss at light load while maintaining regulation.
Two-stage over-voltage protection	Soft shutdown at 108–122% VFB; hard latch at >110% VFB with PG assertion - prevents damage during feedback fault or divider failure.

Applications

Industrial DC Bus Power

PoE+ Powered Equipment

Use Scenario: Power conversion from 48V industrial DC bus to 3.3V/5V/12V rails for PLC I/O modules and motor controllers.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator handling full load with integrated MOSFETs and robust OVP/OCP.

Use Value: Eliminates need for external high-voltage MOSFETs and gate drivers; maintains >92% efficiency at 48V→12V/3A with minimal BOM count.

Use Scenario: Non-isolated DC/DC stage in IEEE 802.3at/af powered devices such as IP cameras and VoIP phones.

IC Role / Device Role / Timing Role: Input-stage buck converter accepting up to 55V PoE input, providing stable 5V/3.3V for SoC and PHY.

Use Value: Wide VIN tolerance accommodates PoE voltage ripple and transients; PG signal enables safe boot sequencing with Ethernet controller.

Automotive Infotainment Supply

Printer Engine Power Management

Use Scenario: 12V/24V battery-fed power supply for display backlight drivers and audio amplifiers in vehicle head units.

IC Role / Device Role / Timing Role: High-efficiency step-down regulator with UVLO (3.7V rising) and thermal shutdown for cold-crank and load-dump resilience.

Use Value: Operates down to 4.5V input - survives automotive cold-crank; exposed pad ensures thermal stability during burst-mode printing loads.

Use Scenario: Main logic supply in laser printers and multifunction peripherals requiring fast transient response during heater activation.

IC Role / Device Role / Timing Role: Synchronous buck converter delivering 5A to FPGA, MCU, and sensor subsystems with precise PG signaling.

Use Value: Peak-current-mode control delivers <50µs transient recovery; SS pin enables controlled ramp-up to avoid paper jam-triggering inrush.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5164QPWPRQ1	4.5–65V input, 3.5A, requires external MOSFETs; no integrated low-side switch; fixed 500kHz or sync-capable oscillator.	Lacks integrated low-side FET - needs external driver and MOSFET; higher BOM cost but supports higher VIN and custom gate drive tuning.	Select when >55V input or discrete gate control is required; not drop-in due to different pinout and external component dependencies.
TPS54560BQDDARQ1	3.5–60V input, 5A, integrated FETs; fixed 500kHz or sync-capable; no valley-current OCP - uses cycle-by-cycle only.	Lower R_DS(on) (60mΩ HS/40mΩ LS) but lacks valley-current detection; less robust under sustained short-circuit conditions.	Prefer for cost-sensitive automotive apps where short-circuit duration is limited; verify thermal design without valley-OCP derating.

Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MP4575GF-P uniquely combines 55V max VIN, 5A integrated capability, valley-current OCP, and BIAS-enabled VDD boost - making it optimal for space-constrained PoE and industrial systems needing fault resilience and thermal headroom.

Availability

MP4575GF-P is available at Aetrix Electronics and suitable for industrial automation, PoE-powered equipment, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP4575GF-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 a focus on energy-efficient DC/DC conversion, motor drivers, and LED lighting solutions.

The MP4575 belongs to MPS's high-voltage synchronous buck converter product line, designed specifically for industrial, PoE, and automotive applications demanding wide-input-range operation, integrated power stages, and comprehensive fault protection.

FAQ

What is the maximum allowable input voltage for MP4575GF-P?

The absolute maximum input voltage is 60V, but the recommended operating range is 4.5V to 55V. Exceeding 55V risks violating the 60V absolute rating under transient conditions, and the internal UVLO (rising threshold 3.7–4.1V) ensures safe startup only within spec. Operation above 55V may cause premature device failure even if below 60V due to internal stress margins.

Can MP4575GF-P operate without connecting the BIAS pin?

Yes - BIAS can be left floating or tied to GND. In that case, VDD is regulated to 3.6V from VIN, and internal circuitry is powered by a 2.5V regulator sourced from VIN. However, connecting BIAS to a clean 5V source raises VDD to 4.8V, reducing driver losses and improving thermal performance above 2A load - especially beneficial in sealed enclosures.

How does the valley-current OCP function differ from standard cycle-by-cycle limiting?

Valley-current OCP monitors inductor current at the end of each switching cycle. If the valley current exceeds a threshold (scaled with FB voltage), the HS-FET remains off until current drops further - preventing runaway during sustained overload or short-circuit. Standard cycle-by-cycle only limits peak current per pulse and cannot prevent sub-harmonic oscillation or thermal runaway under low-duty-cycle faults.

Is the MP4575GF-P pin-compatible with other MP4575 variants like MP4575GQ-Z?

No - MP4575GF-P uses TSSOP-20 EP packaging, while MP4575GQ-Z is in QFN-20 EP. Though electrically identical, the packages differ in footprint, thermal pad layout, and pin pitch (0.65mm vs. 0.5mm). PCB redesign and requalification are required for substitution; thermal performance also differs due to distinct θ_JA (45°C/W vs. 30°C/W).

What is the minimum external soft-start capacitor value needed for reliable startup?

A minimum 1nF capacitor on SS yields ~1ms soft-start time (using ISS = 4µA and VREF = 1V). For longer delays (e.g., 10ms), use 10nF. The internal 500µs soft-start is overridden only if the external time exceeds it. Below 1nF, startup may become erratic due to insufficient charge time and noise susceptibility on the SS node.

Does MP4575GF-P support forced PWM mode at light load?

No - it operates exclusively in auto-frequency-scaling mode (also called "pulse-skipping" or "burst mode") at light load. There is no pin or register to force continuous conduction mode (CCM). This design prioritizes light-load efficiency over output ripple; users requiring low-noise CCM must add external post-regulation or select a different controller.

How is thermal shutdown triggered and recovered?

Thermal shutdown activates at TJ ≈ 170°C (typ.), latching off both MOSFETs and asserting PG low. Recovery occurs automatically when junction temperature falls to ≈160°C (10°C hysteresis). The exposed pad must be soldered to a thermal plane; θ_JA = 45°C/W assumes JEDEC 4-layer board - inadequate copper will trigger shutdown well below 5A continuous load.

MP4575GF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm 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):: 4.5V

Voltage - Input (Max):: 55V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 49.5V

Current - Output:: 5A

Frequency - Switching:: -

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP-EP

MP4575GF-P FAQ

1.How can I place an order for MP4575GF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4575GF-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 MP4575GF-P reliable?

The price and inventory of MP4575GF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4575GF-P is usually 5 days.

3.What payment methods are accepted for MP4575GF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4575GF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4575GF-P?

MP4575GF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4575GF-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 MP4575GF-P?

For technical support, including MP4575GF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4575GF-P requirements.

6.How does Aetrix verify that MP4575GF-P is sourced from the original manufacturer or authorized distributors?

All MP4575GF-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 MP4575GF-P meets industry standards.

7.What is the process for return or replacement of MP4575GF-P?

All MP4575GF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4575GF-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 MP4575GF-P part is unused and in its original packaging.

Return procedure for MP4575GF-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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