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Monolithic Power Systems Inc. MP4423GQ-P
- Part No.:
- MP4423GQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MP4423GQ-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,559
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Product details
Overview
MP4423GQ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 85mΩ high-side and 55mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 4V–30V input range while maintaining 0.8V–0.9×VIN adjustable output voltage. It features 410kHz default switching frequency, automotive-grade 36V transient tolerance, and power-good (PG) monitoring - deployed in automotive infotainment power rails and industrial sensor node supplies.
For engineers reviewing the MP4423GQ-P datasheet, MP4423GQ-P pinout, MP4423GQ-P application, or MP4423GQ-P equivalent, key selection criteria include its 36V input transient rating, internal soft-start timing (1.5ms), hiccup-mode over-current protection, thermal shutdown threshold (170°C), and QFN-8 (3mm×3mm) package compatibility with high-density PCB layouts.
Technical Context
The MP4423GQ-P operates in fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation without external loop components. Its current-mode architecture delivers fast transient response to load steps and simplifies stability design across wide VIN and VOUT ranges.
It integrates a 5V internal bias regulator powered from VIN, bootstrap circuitry for high-side gate drive (with BST pin requiring external 0.1µF capacitor and optional 20Ω series resistor), and EN/SYNC pin supporting both enable/disable control and external clock synchronization from 200kHz to 2.2MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous; supports 36V transients - enables direct connection to automotive battery rails during load dump. |
| Output Current | 3A continuous - sustains full-rated load at TJ ≤ 125°C with standard 4-layer PCB layout. |
| Switching Frequency | Default 410kHz; synchronizable 200kHz–2.2MHz - allows EMI optimization and avoids noise-sensitive bands. |
| Feedback Reference | 792mV ±12mV - sets precise output voltage via external resistor divider; enables 0.8V minimum VOUT. |
| RDS(ON) HS/LS | 85mΩ / 55mΩ - reduces conduction loss and improves full-load efficiency (>92% typical at 12V→3.3V/3A). |
| Thermal Shutdown | 170°C activation with 30°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Power Good Threshold | 90% of VFB rising, 84% falling - provides accurate output voltage monitoring with 90μs delay for reliable system sequencing. |
Pinout & Package
MP4423GQ-P is housed in a thermally enhanced QFN-8 (3mm × 3mm) package with exposed thermal pad, optimized for compact automotive and industrial power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider tap; regulates output by comparing against 792mV reference; triggers fold-back below 660mV during fault. |
| 2 VCC | Bias Supply Rail | Internal 5V regulator output; requires 0.1µF ceramic decoupling close to pin; powers control circuitry and gate drivers. |
| 3 EN/SYNC | Enable & Clock Input | Logic-high enables operation; external 200kHz–2.2MHz clock synchronizes switching edge; includes 500kΩ pull-down. |
| 4 BST | Bootstrap Supply | Drives high-side MOSFET gate; requires capacitor between BST and SW; 20Ω series resistor recommended to suppress SW spikes. |
| 5 GND | System Ground Reference | Primary return path for power and signal; must connect directly to large copper pour with multiple vias for thermal and noise control. |
| 6 SW | Switch Node | High-frequency drain connection of internal HS/LS MOSFETs; requires wide, low-inductance PCB trace to minimize ringing. |
| 7 IN | Main Input Supply | Accepts 4V–30V DC input; requires local 22µF + 1µF ceramic decoupling; handles discontinuous input current with high RMS ripple. |
| 8 PG | Power-Good Open-Drain Output | Asserts high when VOUT ≥ 90% of target; pulled low during startup, OCP, thermal shutdown, or EN deactivation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Load Dump Tolerance | Withstands 36V transients per ISO 7637-2 - eliminates need for upstream TVS in many 12V/24V systems. |
| Cold-Crank Support | Operates down to 4V input with >92% duty cycle - maintains regulation during engine cranking (6.5V battery dips). |
| Integrated Soft-Start | 1.5ms internal ramp - prevents output overshoot and inrush current during power-up without external components. |
| Hiccup-Mode OCP | Enters periodic restart on sustained short-circuit - limits average fault current to <1A and reduces thermal stress. |
| Power-Save Mode | Auto-engages at light load - reduces switching frequency and quiescent current to 0.7mA, improving standby efficiency. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and display driver in head-unit under varying battery conditions (6V–16V). IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3V rail with PG signaling for safe MCU boot sequencing. Use Value: 36V transient tolerance eliminates external TVS; cold-crank support ensures uninterrupted operation during engine start. |
Use Scenario: Generating isolated 5V/3A supply for analog sensor front-end and digital logic in DIN-rail mounted controller. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with hiccup-mode protection against field-wiring faults. Use Value: Integrated OCP and thermal shutdown prevent field failures; QFN-8 footprint enables compact 24mm² board area. |
| Distributed Telecom Power | Medical Diagnostic Sensor Node |
|
Use Scenario: Local 3.3V conversion from 12V backplane in remote radio unit with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to avoid beat frequencies in RF-sensitive zones. Use Value: 200kHz–2.2MHz sync range enables deterministic noise placement; low EMI due to controlled SW edge rates. |
Use Scenario: Battery-powered portable ultrasound probe requiring low-noise, low-quiescent 3.3V supply for ADC and FPGA. IC Role / Device Role / Timing Role: Efficient step-down regulator with power-save mode extending battery life during idle periods. Use Value: 0.7mA IQ in light-load mode extends runtime; PG signal validates rail integrity before data acquisition. |
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 |
|---|---|---|---|
| LM61480RGER | Higher 8A rating, 2.1MHz max fSW, no integrated BST resistor recommendation | Targets higher-power systems; lacks 36V transient rating - requires external clamping for automotive use | Select when >3A output or >2MHz switching is required; verify thermal design for 8A capability |
| TPS54332DR | 3A rating, 4.5V–28V input, no PG pin, 500kHz fixed fSW, larger SOIC-8 package | Suitable for cost-sensitive industrial designs; missing automotive transient tolerance and power-good monitoring | Choose for non-automotive applications where PG signaling and 36V robustness are not required |
Compared with LM61480RGER and TPS54332DR, MP4423GQ-P uniquely combines automotive-grade 36V transient handling, integrated PG output, and QFN-8 footprint - making it optimal for space-constrained, safety-critical 3A power rails where reliability and board area matter most.
Availability
MP4423GQ-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and distributed telecom power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP4423GQ-P 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 design centers in the US, China, and Taiwan.
The MP4423 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for robust, compact, and efficient power conversion in harsh environments including vehicle electrical systems and industrial automation.
FAQ
What is the maximum allowable input voltage transient for MP4423GQ-P?
The MP4423GQ-P supports 36V input transients per ISO 7637-2 standards, exceeding typical automotive load-dump requirements. Absolute maximum VIN is 40V, but sustained operation above 30V is not recommended. This rating is validated through bench testing and does not require external clamping in most 12V/24V vehicle architectures.
Does MP4423GQ-P require an external bootstrap diode?
No - the MP4423GQ-P integrates a floating bootstrap regulator that charges the BST capacitor from VIN through an internal PMOS transistor. An external diode is optional and only recommended for high-duty-cycle (>65%) applications to improve efficiency; the datasheet specifies IN4148 as a suitable choice if added.
How is power-good (PG) behavior defined during startup and fault conditions?
PG asserts high after VFB reaches 90% of the feedback reference (792mV), with a typical 90μs delay. It pulls low during startup, thermal shutdown, EN deactivation, or if VFB drops to 84% of reference - providing unambiguous rail-status signaling for MCU reset and sequencing logic without external comparators.
Can MP4423GQ-P operate with input voltage below 4V?
No - the device incorporates an internal UVLO with rising threshold at 3.5V and falling threshold at 3.3V. Operation below 4V violates the recommended operating condition and will cause the IC to remain disabled. Cold-crank support refers to maintaining regulation *down to* 4V, not below it.
What is the purpose of the 20Ω resistor recommended between BST and SW pins?
The 20Ω resistor dampens high-frequency ringing at the switch node during HS-FET turn-off, reducing electromagnetic interference and preventing false triggering of the bootstrap UVLO (2.2V threshold). It trades minor efficiency loss (~0.3%) for improved system-level EMC performance and reliability.
Is the MP4423GQ-P pin-compatible with other MP44xx variants?
No - MP4423GQ-P uses a unique QFN-8 (3mm×3mm) pinout optimized for its BST/SW/EN/SYNC configuration. MP4422 and MP4425 share the same package outline but differ in pin functions (e.g., MP4425 has separate COMP and SS pins); direct substitution is not supported without PCB redesign.
What is the thermal resistance (θJA) of MP4423GQ-P on a standard 4-layer PCB?
Measured per JESD51-7 on a 4-layer board with 2oz copper, θJA is 55°C/W. This value assumes proper thermal pad soldering to an internal ground plane with ≥4 thermal vias. Without adequate copper area or vias, θJA may exceed 70°C/W, limiting usable output current at elevated ambient temperatures.
MP4423GQ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-VDFN
- 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):
- 4V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 27V
- Current - Output:
- 3A
- Frequency - Switching:
- 410kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MP4423GQ-P FAQ
1.How can I place an order for MP4423GQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4423GQ-P 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 MP4423GQ-P reliable?
The price and inventory of MP4423GQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4423GQ-P is usually 5 days.
3.What payment methods are accepted for MP4423GQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4423GQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4423GQ-P?
MP4423GQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4423GQ-P 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 MP4423GQ-P?
For technical support, including MP4423GQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4423GQ-P requirements.
6.How does Aetrix verify that MP4423GQ-P is sourced from the original manufacturer or authorized distributors?
All MP4423GQ-P 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 MP4423GQ-P meets industry standards.
7.What is the process for return or replacement of MP4423GQ-P?
All MP4423GQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4423GQ-P, 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 MP4423GQ-P part is unused and in its original packaging.
Return procedure for MP4423GQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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