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Monolithic Power Systems Inc. MPQ4570GF
- Part No.:
- MPQ4570GF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MPQ4570GF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,745
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Product details
Overview
MPQ4570GF from Monolithic Power Systems is a fully integrated, AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 3A continuous output current with 4.5V–55V input range, peak-current-mode control, and programmable switching frequency up to 640kHz. It integrates 90mΩ high-side and 70mΩ low-side MOSFETs and supports external SYNC, soft-start, power-good indication, and thermal shutdown - deployed in automotive power systems, PoE-powered industrial equipment, and high-voltage printer DC-DC rails.
For engineers reviewing the MPQ4570GF datasheet, MPQ4570GF pinout, MPQ4570GF application, or MPQ4570GF equivalent, key selection criteria include its wide VIN range, valley-current-detection OCP, frequency scaling under light load, BIAS pin for efficiency optimization, and TSSOP-20 EP package with exposed thermal pad for automotive-grade thermal reliability.
Technical Context
The MPQ4570GF implements peak-current-mode control with internal error amplifier (transconductance 430–730μA/V) and PWM comparator featuring 90ns minimum on-time and 100ns minimum off-time. Its oscillator frequency is set by an external resistor at FREQ pin or synchronized via external clock (100–1000kHz), and it dynamically scales switching frequency downward under light load to reduce switching loss.
It features dual power supply architecture: VDD regulated at 3.6V (from VIN) or 4.8V (from external BIAS ≥4.2V), enabling improved efficiency when powered from stable 5V sources. Protection includes valley-current-detection OCP, 115% overvoltage protection with auto-recovery, UVLO with 400mV hysteresis, and thermal shutdown at 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 48V PoE, 24V/36V automotive, and industrial HV bus without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures. |
| Switching Frequency | Programmable 400–640kHz (via RFREQ) or 100–1000kHz (SYNC) - enables EMI optimization and inductor size reduction. |
| Internal MOSFET RDS(on) | 90mΩ HS / 70mΩ LS - minimizes conduction loss and eliminates need for external power switches. |
| Feedback Reference Voltage | 1.0V ±2% - enables precise output regulation across temperature and line/load variations. |
| Power Good Threshold | 90% VFB rising / 85% VFB falling - provides clean, hysteresis-controlled system power sequencing signal. |
| Thermal Shutdown | 170°C trip / 160°C recovery - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
The MPQ4570GF is housed in a thermally enhanced TSSOP-20 EP package with exposed pad (pins 13, 14, 15, and exposed pad) for low-θJC (10°C/W) heat dissipation - critical for AEC-Q100 Grade 1 automotive operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to stabilize loop dynamics; sets error amplifier pole-zero placement. |
| 2 FB | Feedback input | Senses output voltage via resistive divider; referenced to 1.0V internal bandgap for regulation. |
| 3 FREQ | Frequency programming/SYNC input | Resistor-to-GND sets fSW; external clock overrides internal oscillator for system-level timing synchronization. |
| 4 EN | Enable control | Active-high logic input (1.6V threshold); no internal pull-up - requires explicit biasing to avoid floating state. |
| 5 BST | Bootstrap supply | Drives high-side gate via external 0.1μF capacitor to SW; internal regulator charges BST to 4.2V. |
| 6,7,8 VIN | Main input power | Supplies control circuitry and VDD regulator; requires local ceramic decoupling to suppress switching noise. |
| 10,11 SW | Switch node | Drives external inductor; connects to BST capacitor; high dv/dt node requiring careful layout. |
| 13,14,15, Exposed Pad GND | Power ground | Low-inductance return path for high-side/low-side MOSFET currents; must be soldered to large PCB copper area. |
| 16 VDD | Driver supply | Provides 3.6V (VIN-powered) or 4.8V (BIAS-powered) rail for gate drivers and BST charging circuit. |
| 17 BIAS | Efficiency-optimized supply | When connected to 4.2–5.5V source, powers VDD and reduces quiescent loss - improves light-load efficiency. |
| 18 PG | Power good open-drain | Signals valid regulation (90% VFB) or fault (85% VFB); requires external pull-up for system power sequencing. |
| 19 SS | Soft-start timing | External capacitor sets ramp time; internal 500μs default ensures controlled startup and limits inrush current. |
| 20 AGND | Analog ground | Separate low-noise reference for FB, COMP, and error amplifier - must be routed away from power ground noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates 4 external FETs and associated gate-drive components, reducing BOM count and board area by >30%. |
| Valley-current-detection OCP | Prevents inductor current runaway during short-circuit events while maintaining cycle-by-cycle peak limiting. |
| Load-dependent current limit foldback | Reduces OCP threshold to 50% at zero output voltage - lowers thermal stress during sustained output shorts. |
| BIAS pin for efficiency optimization | Enables VDD sourcing from stable 5V rail, cutting quiescent current by ~30% and improving light-load efficiency. |
| Programmable frequency + SYNC capability | Allows EMI spread-spectrum tuning or synchronization to master clock - essential for multi-rail automotive ECUs. |
Applications
| Automotive Body Control Module | PoE-Powered Industrial Camera |
|---|---|
|
Use Scenario: Supplies 3.3V/2.5V rails to MCU, CAN transceiver, and sensor interfaces in door module or lighting ECU. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 12V/24V battery to low-voltage logic supplies. Use Value: AEC-Q100 Grade 1 qualification, -40°C to +125°C operation, and thermal shutdown ensure reliability in under-hood environments. |
Use Scenario: Powers image sensor, ISP, and Ethernet PHY in IP surveillance camera powered via IEEE 802.3at PoE+. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down 57V PoE voltage to 5V intermediate rail. Use Value: 55V max VIN and valley-current OCP enable robust operation despite PoE cable voltage drop and surge transients. |
| Industrial Printer Main Logic Supply | Distributed Telecom Power System |
|
Use Scenario: Generates 5V/3.3V for print controller, motor driver logic, and USB interface in multifunction printers. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter fed from 48V DC bus derived from AC/DC front-end. Use Value: Frequency programmability allows EMI compliance in dense PCB layouts; TSSOP-20 EP aids thermal management in enclosed chassis. |
Use Scenario: Provides isolated 3.3V auxiliary supply in base station radio unit powered from -48V telecom bus. IC Role / Device Role / Timing Role: Non-isolated buck stage converting -48V (referred to local ground) to positive 3.3V logic rail. Use Value: Wide 4.5–55V input accommodates -48V bus with margin; PG pin enables centralized power supervision across distributed modules. |
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 |
|---|---|---|---|
| MPQ4572GF | Higher 5A output current, same 4.5–55V input, identical pinout and feature set. | Better suited for higher-power loads (e.g., multi-core SoCs) without redesigning layout or compensation. | Select when >3A continuous load or higher transient headroom is required; otherwise MPQ4570GF offers optimal cost/performance balance. |
| LM5164QPWPRQ1 | 4.5–65V input, 350kHz fixed frequency, no BIAS pin, lower 1.5A rating, different package (HTSSOP-16). | Lacks frequency programming, valley-current OCP, and thermal performance of MPQ4570GF in high-ambient conditions. | Consider only if strict TI ecosystem alignment is required; MPQ4570GF delivers superior integration, efficiency, and automotive qualification depth. |
Compared with MPQ4572GF, MPQ4570GF trades 2A output headroom for lower thermal density and cost; versus LM5164QPWPRQ1, it adds BIAS-driven efficiency, programmable frequency, and stronger automotive qualification - making it the preferred choice for space-constrained, thermally demanding AEC-Q100 designs.
Availability
MPQ4570GF is available at Aetrix Electronics and suitable for automotive body electronics, PoE-powered imaging systems, and industrial printer power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for MPQ4570GF 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 MPQ4570GF belongs to MPS's automotive-qualified MPQ series of integrated buck converters, designed specifically for harsh-environment applications demanding AEC-Q100 Grade 1 reliability, wide-input operation, and minimal external component count.
FAQ
What is the maximum allowable input voltage for MPQ4570GF, and what happens above that limit?
The absolute maximum VIN is 60V. Operation beyond this risks permanent damage to internal MOSFETs and gate drivers. The device includes 4.1V UVLO rising threshold and 400mV hysteresis, but this protects only against undervoltage-not overvoltage. External clamping (e.g., TVS diode) is recommended for systems where transient spikes may exceed 55V nominal input.
Can MPQ4570GF operate without an external bootstrap capacitor?
No. The BST pin requires a 0.1μF ceramic capacitor connected directly to the SW node to power the high-side gate driver. Omitting it prevents high-side MOSFET turn-on, causing complete regulator failure. The internal bootstrap regulator charges this capacitor to 4.2V; insufficient capacitance or poor layout causes erratic switching or thermal shutdown.
How does the BIAS pin improve efficiency, and what voltage range is supported?
Connecting BIAS to 4.2–5.5V powers the VDD regulator and internal circuits directly, bypassing the less-efficient VIN-to-VDD LDO. This reduces quiescent current by ~30% and improves light-load efficiency. Voltages below 3.2V default to VIN supply; above 5.4V, VDD regulates at 4.8V with 600mV dropout.
Is MPQ4570GF pin-compatible with other devices in the MPQ457x family?
Yes - MPQ4570GF, MPQ4572GF, and MPQ4573GF share identical TSSOP-20 EP pinout, compensation scheme, and functional pin mapping. This enables scalable design reuse: upgrade to MPQ4572GF for 5A or MPQ4573GF for 4A without layout changes, provided thermal and current-sense design margins allow.
What is the purpose of valley-current detection in overcurrent protection?
Valley-current detection monitors inductor current at the end of each switching cycle to prevent subharmonic oscillation and current runaway during overload or short-circuit. Unlike peak-only limiting, it ensures the low-side MOSFET remains on until current falls below a safe threshold - critical for stable operation with high-inductance or low-ESR output capacitors.
Does MPQ4570GF support forced PWM mode, or is it strictly auto-frequency scaling?
MPQ4570GF operates exclusively in auto-frequency scaling mode under light load - it does not support forced continuous conduction mode (CCM). When COMP voltage drops below ~0.8V, fSW begins decreasing; below ~0.7V, switching halts entirely. This behavior is fixed in silicon and cannot be disabled via external pins or registers.
How is thermal performance affected by the exposed pad soldering quality?
The exposed pad (pins 13–15 + thermal pad) accounts for >85% of heat transfer to the PCB. Inadequate solder coverage (<70%) or missing thermal vias increases θJA from rated 45°C/W to >70°C/W, risking thermal shutdown at <2A load. MPS recommends 9×9 array of 0.3mm vias filled with solder and connected to solid inner-layer ground plane.
MPQ4570GF 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:
- 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
MPQ4570GF FAQ
1.How can I place an order for MPQ4570GF through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4570GF 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 MPQ4570GF reliable?
The price and inventory of MPQ4570GF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4570GF is usually 5 days.
3.What payment methods are accepted for MPQ4570GF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4570GF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4570GF?
MPQ4570GF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4570GF 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 MPQ4570GF?
For technical support, including MPQ4570GF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4570GF requirements.
6.How does Aetrix verify that MPQ4570GF is sourced from the original manufacturer or authorized distributors?
All MPQ4570GF 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 MPQ4570GF meets industry standards.
7.What is the process for return or replacement of MPQ4570GF?
All MPQ4570GF units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4570GF, 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 MPQ4570GF part is unused and in its original packaging.
Return procedure for MPQ4570GF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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