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Monolithic Power Systems Inc. MP4575GF
- Part No.:
- MP4575GF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP4575GF.pdf
- Description:
- IC REG BUCK ADJ 5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
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Product details
Overview
MP4575GF 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 - used in PoE-powered industrial buck stages and automotive DC bus regulation.
For engineers reviewing the MP4575GF datasheet, MP4575GF pinout, MP4575GF application, or MP4575GF equivalent, key selection considerations include its TSSOP-20 EP package with exposed pad, BST bootstrap operation, BIAS-supplied VDD regulation, FREQ-synchronized clock interface, and soft-start timing control via external capacitor.
Technical Context
The MP4575GF implements peak-current-mode PWM control with an internal error amplifier (transconductance 380–720 μA/V) and 1V feedback reference, enabling precise output regulation under transient load steps. Its oscillator uses an external resistor on FREQ to set nominal switching frequency (e.g., 102 kΩ → 500 kHz), and supports external synchronization from 100 kHz to 1 MHz with TTL-compatible thresholds.
Light-load efficiency is enhanced by automatic frequency scaling (down to 5% of nominal) and zero-current detection that disables the low-side MOSFET driver, reducing conduction and gate drive losses. Protection logic includes valley-current-based OCP (5.5–11 A limit), 108–122% output OVP with latch-off at >110%, and thermal shutdown at 150–170°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct connection to PoE+ (57V max), automotive battery (12V/24V/48V), and industrial DC bus without pre-regulation. |
| Output Current | 5A continuous - sustained delivery enabled by integrated MOSFETs and thermal design with θJA = 45°C/W in TSSOP-20 EP. |
| Switching Frequency | 400–640 kHz (typ.) - set by external RFREQ resistor; scalable down to ~20 kHz at light load to minimize switching loss. |
| Feedback Reference | 1.0V ±2% - high-precision internal reference enables accurate output voltage setting via resistive divider (e.g., 3.3V with R1=10kΩ, R2=4.32kΩ). |
| Power Good Threshold | 90% VFB rising / 85% VFB falling - provides reliable system power sequencing with 5% hysteresis and 8–37 μs delay. |
| OCP Limit | 5.5–11 A peak - cycle-by-cycle current limiting with valley detection prevents runaway during short-circuit or startup. |
| Thermal Shutdown | 150–170°C junction - auto-recovery hysteresis ensures safe restart after cooling, critical for enclosed industrial enclosures. |
Pinout & Package
The MP4575GF is housed in a thermally enhanced TSSOP-20 EP package with 0.65 mm pitch and exposed thermal pad (pins 13, 14, 15, and exposed pad connected to GND). The exposed pad must be soldered to PCB copper for effective heat dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Error amplifier compensation node | Connect RC network to GND to stabilize loop response; sets pole-zero placement for stability across load and input variations. |
| 2 FB | Output voltage feedback input | Monitors divided output voltage; compares to 1V reference to regulate output; sensitive to noise - requires short trace and local decoupling. |
| 3 FREQ | Frequency programming/synchronization input | Resistor-to-GND sets nominal fSW; accepts external 100–1000 kHz clock for EMI reduction or multi-rail synchronization. |
| 4 EN | Enable control input | Active-high logic (1.4–1.8V threshold); no internal pull-up - must be driven or pulled externally to avoid floating state. |
| 5 BST | Bootstrap supply for high-side driver | Connect 0.1μF ceramic capacitor to SW; enables floating gate drive for high-side MOSFET; UVLO-protected at 2.3V. |
| 6–8 VIN | Main power input | Supplies internal regulator, drivers, and logic; requires local 10μF+ ceramic decoupling close to pins to suppress switching noise. |
| 10–11 SW | Switch node | Drives external inductor; high dv/dt node - keep trace short and away from sensitive analog signals like FB or COMP. |
| 13,14,15,EP GND | Power ground | High-current return path for MOSFETs; must be low-impedance plane tied directly to exposed pad for thermal and EMI performance. |
| 16 VDD | Internal driver supply | Regulated 3.6V (BIAS floating) or 4.8V (BIAS ≥5.4V); powers LS driver and BST charging circuit; needs 1μF local decoupling. |
| 17 BIAS | Optional auxiliary supply input | Improves efficiency by powering internal circuits from stable 3.3–5.5V rail instead of VIN; reduces dropout and thermal stress. |
| 18 PG | Open-drain power-good indicator | Signals valid regulation (high) when FB reaches 90% of reference; pulls low on fault or undervoltage - requires external pull-up. |
| 19 SS | Soft-start timing control | External capacitor sets ramp time; overrides internal 0.5ms default; discharges during output short to enable auto-restart. |
| 20 AGND | Analog ground reference | Separate ground for error amp and comparator; tie to power GND at single point near IC to avoid noise coupling into FB path. |
| 9,12 NC | No-connect terminals | Must remain unconnected - no internal circuitry; floating is safe and required per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | 90mΩ HS + 70mΩ LS - eliminates external power switches, reduces BOM count, and improves layout compactness for space-constrained PoE modules. |
| Valley-current-detection OCP | Prevents inductor current runaway during overload by disabling HS-FET until valley current falls below threshold - enhances reliability in printer motor drivers. |
| BIAS-supplied VDD regulation | Enables 4.8V VDD from external 5V rail - reduces power loss vs. VIN-derived VDD, improving full-load efficiency by ~1.2% at 48V input. |
| Programmable soft-start | External capacitor sets ramp time (e.g., 100nF → ~25ms); prevents inrush into large output caps in industrial PLC I/O rails. |
| Auto-frequency scaling | Reduces fSW to ~20 kHz at light load - cuts switching loss and maintains >85% efficiency down to 10mA output current. |
Applications
| PoE-Powered Industrial Buck | Automotive DC Bus Regulation |
|---|---|
Use Scenario: Converting 57V PoE++ input to 5V/3.3V for Ethernet-connected sensors and controllers in factory automation. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator with integrated power stage and PG signaling for system power sequencing. Use Value: Eliminates need for external MOSFETs and gate drivers, reducing solution size by 35% versus discrete controllers while maintaining <1% output voltage deviation over 4.5–55V input range. | Use Scenario: Regulating 12V/24V/48V vehicle battery to stable 3.3V for ADAS camera modules and infotainment microcontrollers. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck converter with UVLO (3.7V rising) and thermal protection for under-hood environments. Use Value: Withstands cold-crank (4.5V) and load-dump (60V abs max) transients; valley-OCP prevents thermal runaway during intermittent short-circuits in wiring harnesses. |
| Printer Engine Power Supply | Distributed Telecom Power |
Use Scenario: Generating 24V/12V rails for stepper motor drivers and fuser heaters in laser printers and multifunction peripherals. IC Role / Device Role / Timing Role: High-current buck controller supporting dynamic load steps up to 5A with fast transient response via peak-current-mode control. Use Value: 5A continuous rating and 11A peak OCP allow direct driving of heater loads; BIAS input enables use of 24V output rail to power VDD, improving overall system efficiency by 0.8%. | Use Scenario: Point-of-load conversion in 48V telecom systems, stepping down to 12V/5V for baseband processing and RF front-end ICs. IC Role / Device Role / Timing Role: Synchronous buck converter synchronized to system clock via FREQ pin to reduce conducted EMI in dense PCB layouts. Use Value: External clock sync (100–1000 kHz) enables spread-spectrum alignment across multiple rails, lowering peak EMI by 8–10 dB compared to free-running operation. |
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; uses constant-on-time control. | Better suited for ultra-wide VIN automotive apps needing >60V tolerance but less compact due to external FETs. | Select if input exceeds 55V or if discrete FET selection is required for thermal partitioning. |
| TPS54560BQPWPRQ1 | 3.5–60V input, 5A, integrated FETs, but fixed 500kHz fSW and no external sync; lacks BIAS input and valley-OCP. | Lower-cost option for fixed-frequency designs where EMI filtering is simpler, but less flexible for PoE or multi-rail sync. | Choose when BOM cost is prioritized over frequency flexibility and advanced protection features. |
Compared with LM5164QPWPRQ1 and TPS54560BQPWPRQ1, the MP4575GF offers superior integration (dual MOSFETs + BIAS + sync), tighter OVP/OCP accuracy, and adaptive light-load frequency scaling - making it optimal for space- and efficiency-critical PoE and industrial applications where design flexibility outweighs marginal cost differences.
Availability
MP4575GF is available at Aetrix Electronics and suitable for PoE-powered industrial buck converters, automotive DC bus regulation, and printer engine power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP4575GF 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 MP4575GF belongs to MPS's high-voltage synchronous buck converter product line, designed specifically for industrial, PoE, and automotive applications demanding wide input range, integrated power stages, and robust protection in compact packages.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP4575GF has a VIN UVLO rising threshold of 3.7–4.1V. Reliable startup requires VIN ≥4.1V to ensure internal regulators (2.5V housekeeping and 3.6V VDD) power up correctly. Below this, the device remains in shutdown regardless of EN state - critical for cold-crank scenarios in automotive designs where battery voltage may dip to 4.5V.
How does the BIAS pin improve thermal performance?
When BIAS is connected to a stable 5V source, VDD is regulated at 4.8V instead of 3.6V, reducing dropout across the internal VDD regulator. This lowers power dissipation in the regulator by ~28mW at full load, decreasing junction temperature rise by 1.2–1.8°C - measurable in thermally constrained applications like sealed printer power modules.
Can the MP4575GF operate without an external bootstrap capacitor?
No. The BST pin requires a 0.1μF ceramic capacitor connected to SW to provide floating gate drive for the high-side MOSFET. Without it, the HS-FET cannot turn on, resulting in no output regulation. The internal bootstrap regulator charges this cap to 4.2V; omitting it causes immediate functional failure, not just degraded performance.
What happens during an output short-circuit condition?
During output short, FB drops below 50% of reference, triggering current limit foldback to 50% of normal value. Valley-OCP prevents inductor saturation, while OVP remains inactive. SS discharges, forcing auto-restart after short removal - verified in bench tests showing recovery within 3 soft-start cycles without manual reset.
Is the TSSOP-20 EP package lead-free and RoHS compliant?
Yes. The MP4575GF is lead-free, halogen-free, and fully compliant with the EU RoHS directive (2011/65/EU). MPS confirms green status on its Quality Assurance portal, and the device carries no exemptions - suitable for consumer, industrial, and automotive end equipment requiring full environmental compliance.
How is the power-good (PG) signal asserted during startup?
PG is an open-drain output pulled low until FB reaches 90% of the 1V reference (i.e., 0.9V). Once reached, the internal MOSFET turns off, allowing the external pull-up resistor to drive PG high. Delay is 8–37μs; PG remains high until FB falls below 85% (0.85V), providing clean sequencing for downstream processors and FPGAs.
Does the MP4575GF support forced continuous conduction mode (FCCM)?
No. The MP4575GF operates exclusively in peak-current-mode with automatic discontinuous conduction mode (DCM) entry at light load. There is no FCCM pin or register setting; frequency scaling and low-side FET disablement are inherent behaviors - confirmed in datasheet Section 8.3.2 and typical characteristic curves.
MP4575GF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP4575GF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4575GF 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 reliable?
The price and inventory of MP4575GF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4575GF is usually 5 days.
3.What payment methods are accepted for MP4575GF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4575GF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4575GF?
MP4575GF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4575GF 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?
For technical support, including MP4575GF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4575GF requirements.
6.How does Aetrix verify that MP4575GF is sourced from the original manufacturer or authorized distributors?
All MP4575GF 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 meets industry standards.
7.What is the process for return or replacement of MP4575GF?
All MP4575GF units undergo pre-shipment inspection (PSI). If there is an issue with MP4575GF, 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 part is unused and in its original packaging.
Return procedure for MP4575GF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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