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Monolithic Power Systems Inc. MPQ4470AGL-Z
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- Part No.:
- MPQ4470AGL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MPQ4470AGL-Z.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
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Product details
Overview
MPQ4470AGL-Z from Monolithic Power Systems is a high-efficiency, synchronous step-down DC/DC converter delivering 5A continuous output current across a 4.5V–36V input range. It integrates 40mΩ high-side and 20mΩ low-side MOSFETs, supports 100kHz–1MHz programmable switching frequency, and features fast transient response with 1% reference voltage accuracy. Used in automotive power rails and industrial POL systems where compact size and AEC-Q100 Grade 1 qualification are required.
For engineers reviewing the MPQ4470AGL-Z datasheet, MPQ4470AGL-Z pinout, MPQ4470AGL-Z application, or MPQ4470AGL-Z equivalent, key selection considerations include its absence of OVP latch-off (vs. MPQ4470), QFN20 (3mm×4mm) thermal performance, soft-start programmability via external capacitor, and bootstrap-based high-side gate drive architecture.
Technical Context
The MPQ4470AGL-Z employs fixed-frequency PWM control with feed-forward input voltage compensation to maintain stable switching frequency across wide VIN ranges. Its proprietary dead-time control prevents shoot-through between integrated high- and low-side MOSFETs, while internal current-mode modulation enables cycle-by-cycle over-current protection without external sensing.
It operates in continuous conduction mode (CCM) at heavy loads and automatically transitions to skip mode at light loads to sustain >85% efficiency down to 1mA output current. The device uses an internal 8.5μA soft-start current source and open-drain PGOOD with 700μs delay and 5% hysteresis relative to VFB for reliable system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - Supports 12V/24V automotive and industrial bus rails with 40V absolute max rating. |
| Continuous Output Current | 5A - Delivered with integrated 40mΩ/20mΩ MOSFETs; no external power stage needed. |
| Reference Voltage Accuracy | ±1% at 25°C, ±0.34% over -40°C to +125°C - Enables precise output regulation without trimming. |
| Switching Frequency Range | 100kHz to 1MHz - Programmable via resistor on FREQ pin; allows trade-off between efficiency and EMI/filter size. |
| Soft-Start Current | 8.5μA typical - Charges external SS capacitor linearly; sets ramp time independent of load or input. |
| Power Good Threshold | 90% VFB rising / 85% VFB falling - Provides sequenced enable signaling with 700μs delay and 5% hysteresis. |
| Thermal Shutdown | 175°C with 45°C hysteresis - Non-latching protection; resumes operation after junction cools to ~130°C. |
| UVLO Thresholds | Rising: 4.0V ±0.3V; Falling: 3.1V ±0.3V - Ensures clean startup/shutdown with 900mV hysteresis. |
Pinout & Package
MPQ4470AGL-Z is housed in a thermally enhanced 3mm×4mm, 20-pin QFN package with exposed thermal pads (pins 8, 19, 21, 22, 23 for IN; pins 9, 10, 17, 18, 24, 25 for SW; pins 11–16 for PGND). The package supports high-power density designs with θJA = 48°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AGND | Analog ground reference for feedback and bias circuitry; must be separated from PGND in layout. |
| 2 | FREQ | Resistor-programmed frequency set node; determines ON-time and thus switching frequency. |
| 3 | FB | Feedback input for output voltage regulation; connects to resistor divider tap at VOUT. |
| 4 | SS | Soft-start capacitor node; internal 8.5μA current source ramps voltage to control output rise time. |
| 5 | EN | Enable input with 1.25V rising threshold and internal 1MΩ pull-down; supports direct VIN tie with resistor. |
| 6 | PGOOD | Open-drain power-good flag; asserts HIGH when VFB ≥ 90% VREF, with 700μs delay. |
| 7 | BST | Bootstrap supply for high-side gate driver; requires 0.1–1μF capacitor to SW. |
| 8,19,21,22,23 | IN | Main input power connections; multiple pins reduce trace resistance and improve thermal dissipation. |
| 9,10,17,18,24,25 | SW | Switch node connecting internal MOSFETs; requires short, wide copper paths to minimize ringing. |
| 11–16 | PGND | Power ground return for output inductor and low-side MOSFET; shared reference for regulated output. |
| 20 | VCC | Internal bias regulator output; decoupled with 1μF ceramic capacitor for stable gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 40mΩ HS + 20mΩ LS MOSFETs eliminate external switches and reduce BOM count and footprint. |
| Low Dropout Mode | Enables operation at high duty cycles (VIN ≈ VOUT) via bootstrap refresh circuitry during light load. |
| Programmable Soft-Start | External capacitor on SS pin sets controlled output ramp time-prevents inrush current and overshoot. |
| AEC-Q100 Grade 1 Qualified | Rated for -40°C to +125°C junction temperature; validated for automotive power supply applications. |
| Comprehensive Protection | Includes SCP, OCP, UVP, thermal shutdown, and UVLO-no external fault management circuitry required. |
| Fast Transient Response | Stable regulation under ±2A load steps with <50μs recovery; enabled by high-bandwidth error amplifier and current-mode control. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers display backlight drivers and SoC core rails in head-unit systems operating from 12V battery with cold-crank dips. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/5A with AEC-Q100 compliance and UVLO hysteresis to survive 4.5V brownouts. Use Value: Eliminates need for external OVP latch (not required in infotainment), reduces thermal derating vs. discrete solutions, and enables single-layer PCB routing with QFN20 footprint. |
Use Scenario: Supplies isolated field I/O power in programmable logic controllers with 24V nominal input and variable load profiles. IC Role / Device Role / Timing Role: POL converter providing stable 5V rail to digital isolators and ADC front-ends with fast line/load regulation. Use Value: Maintains >90% efficiency from 10mA to 5A load; skip-mode operation extends standby runtime; PGOOD enables safe firmware boot sequencing. |
| Optical Transceiver Bias Supply | Networking Switch ASIC Core Rail |
Use Scenario: Generates low-noise 3.3V bias for SFP+ laser drivers in telecom equipment with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (1MHz) buck converter minimizing LC filter size while meeting CISPR-32 Class B conducted emissions. Use Value: Programmable frequency avoids sensitive IF bands; ceramic-capacitor compatible design eliminates ESR-dependent compensation. |
Use Scenario: Powers 1.2V/4A core rail for multi-gigabit Ethernet switch ASICs in enterprise routers. IC Role / Device Role / Timing Role: High-current, low-VOUT buck regulator with tight 1% reference and fast transient response to handle burst traffic loads. Use Value: Integrated MOSFETs reduce board area by 40% vs. controller+discrete solution; thermal shutdown prevents damage during thermal throttling events. |
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 |
|---|---|---|---|
| MPQ4470GL-Z | Includes OVP latch-off function; otherwise identical pinout, specs, and package. | Required where output overvoltage must force hard shutdown (e.g., safety-critical sensor supplies). | Select MPQ4470GL-Z only if OVP latch is mandated; MPQ4470AGL-Z simplifies restart behavior in non-safety systems. |
| TPS54560BQPWPRQ1 | Lower 4.5V–60V input range; 5A rated but 100mΩ/60mΩ MOSFETs; no integrated BST capacitor charging control. | Used in higher-input industrial systems where 36V max is insufficient; requires external bootstrap management. | Choose TPS54560BQPWPRQ1 only for >36V inputs; MPQ4470AGL-Z offers better efficiency below 36V and simpler layout. |
Compared with MPQ4470GL-Z, MPQ4470AGL-Z removes latch-off OVP for graceful recovery after overvoltage events-critical in infotainment systems. Against TPS54560BQPWPRQ1, it delivers lower RDS(on), integrated bootstrap regulation, and smaller solution size at 36V-class inputs.
Availability
MPQ4470AGL-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and optical transceiver bias supplies requiring stable component supply, AEC-Q100 qualification, and long-term production support.
Supply support for MPQ4470AGL-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 mixed-signal ICs for power management, motion control, and interface applications.
The MPQ4470/4470A belongs to MPS's automotive-grade DC/DC converter product line, designed specifically for space-constrained, high-reliability applications demanding AEC-Q100 Grade 1 compliance and robust transient performance.
FAQ
What is the key functional difference between MPQ4470AGL-Z and MPQ4470GL-Z?
MPQ4470AGL-Z omits the output over-voltage protection (OVP) latch-off feature present in MPQ4470GL-Z. When VFB exceeds 125% of reference voltage, MPQ4470GL-Z shuts down permanently until power-cycled, whereas MPQ4470AGL-Z continues normal operation. This makes MPQ4470AGL-Z suitable for non-safety-critical applications where automatic recovery is preferred.
Can MPQ4470AGL-Z operate with ceramic output capacitors without external ramp compensation?
Yes-but only if the output capacitor's ESR is sufficient to generate adequate VFB ripple slope for stability. For low-ESR ceramics, external ramp compensation (R4/C4) is required to ensure noise immunity and prevent jitter. Bench data shows VSLOPE1 must be maintained between 20–40V/ms in PWM mode; without ramp, minimum ESR is determined by equation 7 using L and VREF.
How does the bootstrap circuit maintain high-side gate drive during 95% duty cycle operation?
The MPQ4470AGL-Z includes an active bootstrap refresh mechanism: when VBST–VSW drops below 2.3V, the LS-FET is forced ON to recharge the BST capacitor through the SW node. This allows sustained high-duty-cycle operation (e.g., 5V-out from 5.5V-in) without external charge-pump circuitry or diode-based solutions.
What is the minimum recommended soft-start capacitor value for a 3.3V/5A output with 1000μF output capacitance?
For output capacitance exceeding 330μF, MPS specifies a minimum CSS of 4.7nF to avoid current-limit triggering during startup. With 1000μF output, a 10nF CSS yields ~1.2ms soft-start time (tSS ≈ CSS × 0.815V / 8.5μA), ensuring controlled inrush while staying within safe current limits.
Does MPQ4470AGL-Z support forced PWM mode to eliminate acoustic noise in light-load conditions?
No-MPQ4470AGL-Z automatically enters skip mode at light loads to maximize efficiency. It does not offer a pin-selectable forced PWM mode. Acoustic noise from ceramic capacitors can be mitigated by selecting COUT with appropriate voltage coefficient (X7R/X5R) and limiting ripple current via inductor value and switching frequency choice.
What PCB layout practices are critical for thermal performance in the QFN20 package?
Maximize copper area connected to the exposed thermal pads (pins 8,19,21,22,23 for IN; 9,10,17,18,24,25 for SW; 11–16 for PGND) using ≥6 thermal vias per pad to inner ground/power planes. Keep IN and SW traces wide (>0.5mm) and short, and place input capacitor ≤2mm from IN/PGND pins to minimize loop inductance and switching losses.
Is the EN pin 5V-tolerant when driven from a microcontroller GPIO?
Yes-the EN pin includes an internal zener clamp with 6.5V breakdown voltage. Driving EN directly from a 3.3V or 5V GPIO is safe. The enable thresholds are 1.25V (rising) and 0.86V (falling), with 390mV hysteresis, ensuring noise-immune logic-level interfacing without external level-shifting.
MPQ4470AGL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-VFQFN 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 5A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
MPQ4470AGL-Z FAQ
1.How can I place an order for MPQ4470AGL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4470AGL-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 MPQ4470AGL-Z reliable?
The price and inventory of MPQ4470AGL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4470AGL-Z is usually 5 days.
3.What payment methods are accepted for MPQ4470AGL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4470AGL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4470AGL-Z?
MPQ4470AGL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4470AGL-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 MPQ4470AGL-Z?
For technical support, including MPQ4470AGL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4470AGL-Z requirements.
6.How does Aetrix verify that MPQ4470AGL-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4470AGL-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 MPQ4470AGL-Z meets industry standards.
7.What is the process for return or replacement of MPQ4470AGL-Z?
All MPQ4470AGL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4470AGL-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 MPQ4470AGL-Z part is unused and in its original packaging.
Return procedure for MPQ4470AGL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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