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

Monolithic Power Systems Inc. MP4570GF-Z

Name: MP4570GF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP4570GF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4570GF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: MP4570GF-Z.pdf

Description:: IC REG BUCK ADJ 3A 20TSSOP

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Product details

Overview

MP4570GF-Z from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 90mΩ high-side and 70mΩ low-side MOSFETs, supporting 4.5V–55V input and delivering up to 3A continuous output current. It employs peak current mode control, programmable switching frequency (100–1000kHz), and features over-voltage, over-current, and thermal shutdown protection. It is used in PoE-powered industrial equipment requiring robust high-voltage buck conversion.

For engineers reviewing the MP4570GF-Z datasheet, MP4570GF-Z pinout, MP4570GF-Z application, or MP4570GF-Z equivalent, key selection considerations include its TSSOP-20 EP package with exposed pad, valley-current-detection OCP, BIAS pin for efficiency optimization, and SYNC capability for system-level clock alignment.

Technical Context

The MP4570GF-Z implements peak current mode control with an error amplifier transconductance of 430–730μA/V and COMP pin voltage set by external RC compensation. Its switching frequency is set via resistor on FREQ pin (e.g., 102kΩ → 500kHz) or synchronized to external 100–1000kHz clock signals.

It integrates dual MOSFETs with R_DS(on) of 90mΩ (HS) and 70mΩ (LS), supports light-load frequency scaling down to 5% of nominal, and disables switching when COMP falls below ~0.7V. Thermal shutdown activates at 150–170°C with 10°C hysteresis, and OVP triggers at 108–122% of V_FB (1V nominal).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 55V - supports PoE, automotive battery rails, and industrial 24/48V systems without pre-regulation.
Output Current	3A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor subsystems.
Switching Frequency	Programmable 100–1000kHz - enables EMI tuning and inductor size optimization across applications.
Internal MOSFETs	90mΩ HS / 70mΩ LS - reduces conduction loss and eliminates need for external power switches.
Feedback Reference	1.0V ±2% - enables precise output regulation with standard resistor-divider design.
Power Good Threshold	V_FB = 86–94% for rising edge - provides reliable rail-valid indication for downstream sequencing.
Thermal Shutdown	150–170°C with 10°C hysteresis - ensures safe recovery after overload or poor PCB thermal design.
OVP Trigger	108–122% of V_FB - protects downstream loads from catastrophic overvoltage during feedback fault.

Pinout & Package

The MP4570GF-Z is housed in a thermally enhanced TSSOP-20 EP package with exposed pad for improved heat dissipation. The exposed pad (pins 13, 14, 15) must be soldered to a large copper pour for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 COMP	Compensation node	Connects external RC network to stabilize loop response; sets pole-zero placement for stability.
2 FB	Feedback input	Senses output voltage via resistive divider; referenced to 1.0V internal bandgap.
3 FREQ	Frequency setting/SYNC input	Resistor-to-GND sets f_SW; external clock overrides internal oscillator for synchronization.
4 EN	Enable control	Logic-level input (1.4–1.8V rise threshold); no internal pull-up-must be actively driven.
5 BST	Bootstrap supply	Charges floating gate driver for high-side MOSFET via 0.1µF capacitor to SW node.
6–8 VIN	Main input power	High-current path for 4.5–55V input; requires local ceramic decoupling near pins.
10–11 SW	Switch node	Drives external inductor; high dv/dt node requiring careful layout and ground plane isolation.
13,14,15 Exposed Pad	Power ground	Primary thermal and current return path for internal MOSFETs; must be soldered to PCB thermal pad.
16 VDD	Driver supply	Regulated 3.6V (from VIN) or 4.8V (from BIAS); powers LS gate driver and BST charging circuit.
17 BIAS	Efficiency-optimized supply	Accepts 3.3–5.5V external source to reduce quiescent loss and improve light-load efficiency.
18 PG	Power good open-drain	Signals valid regulation (high) or fault (low); requires external pull-up resistor (e.g., 100kΩ).
19 SS	Soft-start timing	External capacitor sets ramp time; internal 500µs default if left floating.
20 AGND	Analog ground	Reference for FB, COMP, and error amplifier; separate from power ground to minimize noise coupling.

Key Features

Feature	Design Value
Valley-current-detection OCP	Prevents inductor current runaway during short-circuit by disabling HS until valley current drops below threshold.
BIAS pin for efficiency boost	Reduces internal regulator loss by sourcing VDD from external 3.3–5.5V, improving light-load efficiency by >5%.
Frequency scaling at light load	Switching frequency drops to 5% of nominal when COMP < 0.7V, reducing switching loss without burst-mode noise.
OVP with auto-recovery	Shuts down both MOSFETs immediately at 115% V_FB, resumes operation only after FB falls to ≤103% V_FB.
Integrated bootstrap regulator	Charges BST capacitor to 4.2V using dedicated PMOS pass device; includes UVLO (2.3V) with 300mV hysteresis.
Current limit reduction under short	Peak current limit scales linearly from full value to 50% as FB drops from 50% to 0% of reference-reducing thermal stress during output shorts.

Applications

Industrial Power Systems

PoE-Powered Devices

Use Scenario: Providing 5V/3.3V rails from 24–48V factory automation bus to PLC I/O modules and field sensors.

IC Role / Device Role / Timing Role: Primary non-isolated buck regulator handling wide-input transient surges and maintaining stable output under variable load.

Use Value: Eliminates need for external MOSFETs and reduces BOM count by 6+ components while sustaining >90% efficiency at 2A load.

Use Scenario: Converting IEEE 802.3at PoE+ (57V max) to 12V/5V for IP cameras and VoIP phones.

IC Role / Device Role / Timing Role: High-voltage input stage enabling single-stage conversion without intermediate 12V pre-regulator.

Use Value: Supports full 30W PoE+ delivery with thermal margin up to +85°C ambient due to exposed-pad TSSOP-20 EP package.

Automotive Body Control

Printer Engine Power

Use Scenario: Regulating 12V battery (up to 16V) or 42V start-stop system to 3.3V for CAN transceivers and MCU peripherals.

IC Role / Device Role / Timing Role: Input-tolerant buck converter with UVLO (3.7V rise) and thermal shutdown protecting against engine cranking dips.

Use Value: Maintains regulation during cold-crank events (down to 4.1V VIN) and survives load-dump transients up to 60V.

Use Scenario: Supplying 24V logic and 5V motor control rails in laser printer mainboards powered from 48V DC bus.

IC Role / Device Role / Timing Role: High-efficiency point-of-load converter managing pulsed motor current demands and standby leakage.

Use Value: Achieves >85% efficiency at 10mA standby via frequency scaling, reducing idle power by 30% vs fixed-frequency alternatives.

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
LM5164QWRXMRQ1	4.5–65V input, 1A output, requires external MOSFETs; no integrated low-side switch.	Lower current capacity; suited for space-constrained automotive modules where external FET layout is acceptable.	Select when higher input voltage margin (>55V) is required and lower output current suffices.
RT7297BZSP	4.5–36V input, 3A output, integrated MOSFETs; lacks BIAS pin and valley-current OCP.	Not suitable for >36V inputs like PoE+ or industrial 48V; less robust under sustained short-circuit conditions.	Choose only for cost-sensitive 24V systems where thermal derating under fault is acceptable.

Compared with LM5164QWRXMRQ1 and RT7297BZSP, the MP4570GF-Z uniquely combines 55V rating, 3A integrated power stage, valley-current OCP, and BIAS-driven efficiency-making it optimal for PoE, industrial, and automotive high-voltage buck applications demanding reliability and minimal external components.

Availability

MP4570GF-Z is available at Aetrix Electronics and suitable for industrial power systems, PoE-powered devices, and automotive body control units requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP4570GF-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 MP4570 belongs to MPS's high-voltage synchronous buck converter product line, designed specifically for industrial, PoE, and automotive applications needing wide-input, integrated-FET solutions with robust protection and thermal resilience.

FAQ

What is the maximum allowable input voltage for MP4570GF-Z?

The absolute maximum input voltage is 60V, but the recommended operating range is 4.5V to 55V per datasheet specifications. Operation above 55V risks exceeding internal MOSFET breakdown limits and may trigger UVLO or damage the device. Sustained operation at 55V requires proper thermal design due to increased conduction loss in the 90mΩ high-side MOSFET.

How does the BIAS pin improve efficiency?

The BIAS pin allows external 3.3–5.5V supply to power the internal VDD regulator and low-side gate driver, bypassing the less efficient VIN-to-VDD LDO. This reduces quiescent current by ~200µA and improves light-load efficiency by up to 5 percentage points, especially critical in always-on PoE or automotive standby modes.

Can MP4570GF-Z synchronize to an external clock?

Yes-the FREQ pin accepts external 100–1000kHz clock signals with HIGH >1.5V and LOW <1V. When an external clock is applied, the internal oscillator locks to its falling edge, enabling deterministic switching and EMI reduction in multi-rail systems. Pulse width must exceed 100ns to overcome pin parasitic capacitance.

What is the purpose of valley-current detection in over-current protection?

Valley-current detection prevents inductor current runaway during short-circuit faults by ensuring the high-side MOSFET remains off until the inductor's valley current falls below a defined threshold. This avoids uncontrolled current buildup and thermal runaway, providing safer fault handling than peak-only current limiting.

Is the TSSOP-20 EP package RoHS-compliant and lead-free?

Yes-MP4570GF-Z is lead-free, halogen-free, and fully compliant with the EU RoHS directive. All MPS products meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and undergo rigorous qualification per AEC-Q100 for automotive-grade reliability where applicable.

How is soft-start time calculated with an external capacitor?

Soft-start time t_SS (ms) = C_SS (nF) × 1V / 4µA, where C_SS is the external capacitor on SS pin and 1V is the internal reference. For example, a 100nF capacitor yields ~25ms ramp time. The internal 500µs soft-start is overridden if the external time is longer.

Does MP4570GF-Z support output voltages below 1V?

No-the minimum regulated output is 1V, determined by the internal 1.0V ±2% feedback reference. Output voltages below 1V cannot be achieved using the standard FB divider configuration; alternative regulators with adjustable references or external error amplifiers would be required.

MP4570GF-Z 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:: 3A

Frequency - Switching:: 520kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP-EP

MP4570GF-Z FAQ

1.How can I place an order for MP4570GF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4570GF-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 MP4570GF-Z reliable?

The price and inventory of MP4570GF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4570GF-Z is usually 5 days.

3.What payment methods are accepted for MP4570GF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4570GF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4570GF-Z?

MP4570GF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4570GF-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 MP4570GF-Z?

For technical support, including MP4570GF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4570GF-Z requirements.

6.How does Aetrix verify that MP4570GF-Z is sourced from the original manufacturer or authorized distributors?

All MP4570GF-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 MP4570GF-Z meets industry standards.

7.What is the process for return or replacement of MP4570GF-Z?

All MP4570GF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4570GF-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 MP4570GF-Z part is unused and in its original packaging.

Return procedure for MP4570GF-Z:

1.Submit a request within 90 days.

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

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