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Monolithic Power Systems Inc. MPQ4571GQB-Z
- Part No.:
- MPQ4571GQB-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-VFQFN
- Datasheet:
-
MPQ4571GQB-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
MPQ4571GQB-Z from Monolithic Power Systems is a fully integrated, AEC-Q100 Grade-1 qualified synchronous buck converter delivering 1A continuous output current with 4.5V–60V input range, 2μA shutdown quiescent current, and internal 250mΩ/45mΩ MOSFETs. It serves as a primary DC-DC regulator in automotive power domains requiring cold-crank resilience and low EMI.
For engineers reviewing the MPQ4571GQB-Z datasheet, MPQ4571GQB-Z pinout, MPQ4571GQB-Z application, or MPQ4571GQB-Z equivalent, key selection criteria include its 180° out-of-phase SYNC clock output, valley-current OCP with hiccup SCP, AAM/CCM light-load mode selection, and QFN-12 (2.5mm×3mm) wettable flank package for automotive-grade solder joint inspection.
Technical Context
The MPQ4571GQB-Z employs peak-current-mode control with valley-current detection for over-current protection and integrates a proprietary asynchronous modulation (AAM) scheme that dynamically scales switching frequency under light load to minimize gate driver and switching losses. Its internal compensation network eliminates external loop components.
It features dual-mode operation: forced CCM via CCM/SYNCO pin resistor biasing or automatic AAM entry when the pin is floating - enabling optimized efficiency across 0–1A load range. The 180° phase-shifted SYNC output supports interleaved multi-phase designs without external timing ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports full automotive battery range including cold-crank (4V) and load-dump (60V) transients. |
| Output Current | 1A continuous - sufficient for infotainment SoCs, LED drivers, and motor gate drivers without external boost stages. |
| Quiescent Current | 40μA typical in active mode - enables always-on subsystems with minimal battery drain during vehicle sleep. |
| Shutdown Current | 2μA maximum - meets ISO 16750-2 requirements for ultra-low standby leakage in automotive modules. |
| Switching Frequency | Configurable 300kHz–2.2MHz via FREQ pin resistor - allows EMI optimization and inductor size reduction down to 4.7μH at 2.2MHz. |
| FB Reference Voltage | 0.800V ±1% at 25°C - enables precise output regulation (e.g., 5.0V ±25mV) with standard resistor dividers. |
| Thermal Shutdown | 170°C with 25°C hysteresis - protects against sustained overload while permitting brief high-temp operation during transient peaks. |
Pinout & Package
MPQ4571GQB-Z is housed in a thermally enhanced QFN-12 package (2.5mm × 3mm, 0.5mm pitch) with wettable flanks for automated optical solder-joint inspection - critical for AEC-Q100 Grade-1 automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply | Connects external capacitor between SW and BST to generate floating gate drive voltage for high-side MOSFET. |
| 2 SW | Power switch node | High-current switching output; requires wide PCB trace and tight layout to minimize ringing and EMI. |
| 3 PG | Power good indicator | Open-drain output asserting high when VOUT is within 90–108% of target; falls low at <84% or >116% for fault signaling. |
| 4 FB | Feedback input | Negative input of error amplifier; sets output voltage via external resistor divider; also used by PG and UVLO circuits. |
| 5 FREQ | Frequency programming | Resistor-to-GND sets fSW from 300kHz to 2.2MHz; enables EMI spread-spectrum tuning and board-space optimization. |
| 6 VCC | Bias supply | Internal LDO output powering control logic; requires ≥1µF ceramic decoupling capacitor placed adjacent to pin. |
| 7 GND | Ground reference | Primary thermal and signal return; must connect to large copper pour shared with input/output capacitors. |
| 8 IN | Main power input | Accepts full 4.5–60V range; demands low-ESR input capacitor placed directly at pin to suppress switching spikes. |
| 9,10 NC | No connection | Internally unconnected; recommended to tie to GND for improved thermal dissipation and EMI shielding. |
| 11 CCM/SYNCO | Mode select / sync output | Pull to GND (10k–300kΩ) forces CCM; float enables AAM; outputs 180° phase-shifted clock for multi-phase synchronization. |
| 12 EN | Enable control | Active-high logic input; rising edge threshold 1.45V typical; supports remote ON/OFF sequencing with hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | 250mΩ (HS) / 45mΩ (LS) RDS(on) - eliminates external Schottky diode and reduces BOM count and footprint. |
| AAM light-load efficiency mode | Frequency scaling below 100mA load - achieves >85% efficiency at 1mA output, extending battery runtime. |
| Low-dropout mode | Supports 98% duty cycle - maintains regulation during automotive cold-crank (VIN = 4.5V) with VOUT = 5V. |
| Hiccup-mode short-circuit protection | Auto-recovery after fault clearance - prevents thermal runaway during sustained output shorts without manual reset. |
| Internal soft-start | 0.45ms fixed ramp - limits inrush current into output capacitors and avoids input supply sag during startup. |
| Wettable flank QFN package | Side-wettable leads - enables AOI verification of solder fillet integrity per IPC-A-610 Class 3 standards. |
Applications
| Automotive Infotainment | Automotive LED Lighting |
|---|---|
|
Use Scenario: Powering display backlight and audio DSP in head-unit systems exposed to 4V–60V battery transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with cold-crank hold-up and load-dump immunity. Use Value: Maintains stable output during 4V cold-crank events without brownout, eliminating display flicker or audio dropout. |
Use Scenario: Driving high-brightness LED arrays in adaptive front lighting (AFL) and DRL modules. IC Role / Device Role / Timing Role: Constant-voltage source feeding LED driver ICs; provides ripple-free bias for analog dimming control. Use Value: 20mVpp output ripple (AAM mode) ensures flicker-free illumination; PG signal enables LED fault reporting to body controller. |
| Automotive Motor Control | Industrial Power Systems |
|
Use Scenario: Supplying gate drivers and logic for 12V BLDC fan or pump controllers in engine bay environments. IC Role / Device Role / Timing Role: Isolated auxiliary supply generating 5V for MCU and half-bridge drivers; operates up to +150°C junction. Use Value: Thermal shutdown with 25°C hysteresis prevents latch-up during sustained 105°C ambient + self-heating conditions. |
Use Scenario: Replacing discrete buck solutions in industrial HMIs and programmable logic controllers requiring long-term reliability. IC Role / Device Role / Timing Role: Single-chip 60V-input regulator replacing controller + external MOSFETs + gate drivers. Use Value: Reduces bill-of-materials by 7 components and PCB area by 45% versus discrete alternatives while meeting IEC 61000-4-5 surge immunity. |
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 |
|---|---|---|---|
| LM61480-Q1 | Higher 3.5A rating, fixed 2.1MHz fSW, no AAM mode - higher quiescent current (15μA vs. 2μA shutdown). | Preferred for higher-current motor drives; less suitable for ultra-low-power always-on modules. | Select when >1A output or fixed-frequency EMI control is required; avoid if cold-crank <4.5V or sub-μA shutdown is mandatory. |
| TPS543B20 | 3.5V–20V input, 15A capability, PMBus interface - lacks AEC-Q100 qualification and automotive transient robustness. | Targeted at server/datacom; not validated for automotive temperature cycling or load dump. | Use only in non-automotive industrial applications; reject for any AEC-Q100-compliant design due to missing qualification and 60V rating. |
Compared with LM61480-Q1 and TPS543B20, MPQ4571GQB-Z uniquely balances 60V automotive input tolerance, 2μA shutdown, AEC-Q100 Grade-1 qualification, and wettable flank packaging - making it the only choice for space-constrained, battery-sensitive automotive subsystems requiring zero manual intervention during fault recovery.
Availability
MPQ4571GQB-Z is available at Aetrix Electronics and suitable for automotive infotainment, LED lighting, and motor control applications requiring stable component supply across extended temperature and voltage transients.
Supply support for MPQ4571GQB-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 power management ICs, with over two decades of leadership in DC-DC conversion and motor driver technology.
The MPQ4571 belongs to MPS's automotive-qualified buck converter product line, designed specifically to replace discrete power stages in harsh-environment applications where AEC-Q100 compliance, cold-crank operation, and EMI robustness are mandatory.
FAQ
What is the minimum input voltage required for MPQ4571GQB-Z to start switching?
The device initiates switching when VIN exceeds the UVLO rising threshold of 4.0V (typical), with 500mV hysteresis ensuring reliable turn-on above 4.2V and preventing oscillation near the threshold. This enables operation during automotive cold-crank events down to 4.5V nominal battery voltage.
Can MPQ4571GQB-Z operate in forced continuous conduction mode (CCM) across all loads?
Yes - connecting the CCM/SYNCO pin to GND via a 10kΩ–300kΩ resistor forces CCM operation regardless of load current. This eliminates light-load frequency variation and simplifies EMI filtering but increases no-load quiescent current to 40μA versus 2μA in AAM mode.
How does the power good (PG) pin behave during output overvoltage?
PG asserts low when FB voltage exceeds 116% of VREF (i.e., >0.928V for 5V output), providing immediate fault indication. The 70μs rising-edge and 25μs falling-edge delays ensure noise immunity while enabling fast system-level response to overvoltage events.
What is the thermal performance of MPQ4571GQB-Z on a standard 4-layer PCB?
On a JESD51-7 compliant 4-layer board, θJA is 60°C/W. At 1A load and 24V input, typical power dissipation is ~0.45W, resulting in ~27°C junction rise above ambient - well within the 150°C max rating and enabling operation at +125°C ambient with margin.
Does MPQ4571GQB-Z support synchronization with other converters?
Yes - the CCM/SYNCO pin functions as a 180° out-of-phase clock output. When configured in CCM mode, it delivers a clean, phase-inverted switching signal compatible with MPS's MPQ4572 and other synchronizable buck ICs for interleaved multi-phase designs.
What is the recommended input capacitor for MPQ4571GQB-Z at 60V maximum input?
A 10μF X7R ceramic capacitor rated for ≥75V DC, placed within 2mm of the IN and GND pins, is recommended. For load-dump immunity, add a parallel 47μF low-ESR tantalum or polymer capacitor to absorb high-energy transients without voltage overshoot.
Is the MPQ4571GQB-Z pin-compatible with earlier MPQ4570 variants?
No - MPQ4571GQB-Z uses a 12-pin QFN package with dedicated CCM/SYNCO and FREQ pins, whereas MPQ4570 is an 8-pin SOIC with fixed 500kHz frequency and no synchronization capability. Layout and schematic changes are required for migration.
MPQ4571GQB-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MPQ
- Package/Case:
- 12-VFQFN
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (2.5x3)
MPQ4571GQB-Z FAQ
1.How can I place an order for MPQ4571GQB-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4571GQB-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 MPQ4571GQB-Z reliable?
The price and inventory of MPQ4571GQB-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4571GQB-Z is usually 5 days.
3.What payment methods are accepted for MPQ4571GQB-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4571GQB-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4571GQB-Z?
MPQ4571GQB-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4571GQB-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 MPQ4571GQB-Z?
For technical support, including MPQ4571GQB-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4571GQB-Z requirements.
6.How does Aetrix verify that MPQ4571GQB-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4571GQB-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 MPQ4571GQB-Z meets industry standards.
7.What is the process for return or replacement of MPQ4571GQB-Z?
All MPQ4571GQB-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4571GQB-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 MPQ4571GQB-Z part is unused and in its original packaging.
Return procedure for MPQ4571GQB-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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