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Monolithic Power Systems Inc. MP4436AGR-Z
- Part No.:
- MP4436AGR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MP4436AGR-Z.pdf
- Description:
- IC REG BUCK ADJ 6A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
MP4436AGR-Z from Monolithic Power Systems is a 45V, 6A synchronous step-down converter with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, configurable 350–530kHz switching frequency, 1.7μA shutdown current, and power-good output. It operates across 3.3V–45V input range and supports automotive cold-crank via low-dropout mode and high-duty-cycle operation.
For engineers reviewing the MP4436AGR-Z datasheet, MP4436AGR-Z pinout, MP4436AGR-Z application, or MP4436AGR-Z equivalent, key selection criteria include light-load efficiency in AAM mode, EMI performance with FSS (MP4436A variant), multi-phase synchronization capability, and thermal robustness under 6A continuous load in QFN-20 (4mm×4mm) package.
Technical Context
The MP4436AGR-Z implements current-mode control with fast loop response and frequency foldback during start-up to prevent inductor current runaway. Its dual-mode operation-Advanced Asynchronous Mode (AAM) for ultra-low IQ at light loads and Forced Continuous Conduction Mode (FCCM) for fixed-frequency stability-enables optimized efficiency across wide load ranges.
It integrates symmetric VIN routing for low EMI, out-of-phase SYNCO output for multi-phase interleaving, and ICS pin for active current sharing. The device supports external clock synchronization (350–530kHz), programmable soft-start via SS pin, and precise 0.815V feedback reference with ±1.5% tolerance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 45V - supports full automotive battery range including cold-crank (down to 3.3V) and load-dump transients. |
| Output Current | 6A continuous - delivered with internal MOSFETs; no external power stage required for typical 5V/3.3V rails. |
| Shutdown Current | 1.7μA - enables long-term battery backup in always-on automotive infotainment and ADAS modules. |
| Feedback Reference | 0.815V ±1.5% - sets accurate output voltage via external resistor divider; stable over –40°C to +125°C. |
| Switching Frequency | 350–530kHz (configurable via FREQ pin) - balances efficiency, size, and EMI; synchronizable to external clock. |
| Power Good Threshold | 93%–106% of VOUT nominal - open-drain PG signal asserts only when output is within tight regulation window. |
| Min On-Time | 100ns - enables high step-down ratios (e.g., 45V→3.3V) without pulse-skipping instability. |
Pinout & Package
MP4436AGR-Z is housed in a thermally enhanced QFN-20 (4mm × 4mm) package with exposed thermal pad, rated MSL-1 and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode select | High = FCCM (fixed-frequency); Low = AAM (light-load efficiency); must be actively pulled, not floated. |
| 2 SYNCIN | External sync input | Accepts 350–530kHz clock; enables multi-phase operation or EMI reduction via synchronization. |
| 3,12 VIN | Main input supply | Supplies control circuitry and high-side switch; requires local ceramic decoupling for noise suppression. |
| 4,5,10,11 PGND | Power ground | Low-impedance return path for high-current switching node; separate from AGND to minimize noise coupling. |
| 6 BST | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1μF ceramic capacitor between BST and SW per layout guidelines. |
| 7,8 SW | Switch node | Connection point for external inductor; high di/dt node requiring minimized trace area and length. |
| 9 EN | Enable control | Active-high logic (1V threshold); enables/disables regulator with controlled soft-start via SS pin. |
| 13 SYNCO | Synchronization output | 180° out-of-phase clock output for interleaved multi-phase designs; can be left floating if unused. |
| 14 PG | Power good indicator | Open-drain output; requires external pull-up; asserts high only when VOUT is within ±7% of target. |
| 15 ICS | Current share control | In multi-phase: parallel connection improves phase current balance; in single-phase: tie to VCC or VOUT ≥3V. |
| 16 VCC | Bias supply | Internal LDO output powering gate drivers; requires 10μF ceramic capacitor to PGND per datasheet. |
| 17 AGND | Analog ground | Reference for FB, SS, MODE, and internal error amplifier; must be star-connected to PGND at single point. |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference enables precise VOUT setting (e.g., 5V with 100k/162k divider). |
| 19 SS | Soft-start timing | 6μA current source charges external capacitor; controls ramp rate of output voltage to limit inrush current. |
| 20 FREQ | Frequency programming | Resistor-to-ground sets fSW (e.g., 62kΩ → 470kHz); enables optimization for efficiency vs. EMI trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| Frequency Spread Spectrum (FSS) | MP4436A variant only - reduces peak radiated/conducted EMI by dithering switching frequency, meeting CISPR25 Class 5. |
| Low-Dropout Mode | Enables regulation down to VIN ≈ VOUT + 0.5V - critical for automotive cold-crank where battery drops to 3.3V while powering 5V systems. |
| Hiccup-Mode OCP | Auto-retry current limiting - latches off during sustained overload, then cycles on/off to protect MOSFETs and inductor without thermal runaway. |
| Thermal Shutdown | Triggers at TJ = 170°C with 20°C hysteresis - ensures safe operation under sustained 6A load in compact QFN-20 packages. |
| Multi-Phase Capability | SYNCIN/SYNCO/ICS pins enable up to 4-phase interleaving - reduces input/output ripple and improves dynamic response in high-current ADAS ECUs. |
Applications
| Automotive Infotainment | Automotive Clusters |
|---|---|
|
Use Scenario: Powering SoC, display, audio DSP, and USB peripherals in head-unit systems with wide battery input variation. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator delivering 6A continuous current with AAM mode for standby efficiency. Use Value: 1.7μA shutdown current extends battery life during vehicle sleep; low-dropout mode maintains operation during 6V cold-crank events. |
Use Scenario: Supplying instrument cluster microcontroller, TFT backlight driver, and CAN transceivers in space-constrained dashboards. IC Role / Device Role / Timing Role: High-efficiency 5V rail generator with PG signal for system power sequencing and fault monitoring. Use Value: Open-drain PG output interfaces directly with MCU reset logic; ±7% window ensures reliable brown-out detection. |
| ADAS Camera Module | Industrial Power System |
|
Use Scenario: Powering image sensor, ISP, and SerDes in surround-view or front-facing ADAS cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Synchronous buck converter operating from 12V battery with FCCM mode for low-noise, fixed-frequency operation. Use Value: 100ns minimum on-time supports 12V→1.2V conversion for sensor cores; thermal shutdown protects against ambient >105°C. |
Use Scenario: Providing regulated 5V/3.3V rails in industrial PLC I/O modules requiring high reliability and wide input range. IC Role / Device Role / Timing Role: Robust DC-DC solution with 45V max input handling surge transients and 6A sustained load capability. Use Value: Integrated 48mΩ/20mΩ MOSFETs eliminate external components; QFN-20 package enables compact, thermally efficient layout. |
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 |
|---|---|---|---|
| MPQ4436AGRE-A | Automotive-grade (AEC-Q100 Grade 1), same electrical specs, enhanced ESD (±8kV HBM), extended temp range (–40°C to +150°C). | Required for safety-critical ADAS ECU power rails; qualified for under-hood deployment. | Select when AEC-Q100 compliance and extended junction temperature are mandatory. |
| LM61460QWRNRQ1 | Texas Instruments part: 3.8–36V input, 6A, 1.5μA shutdown, but lacks FSS, multi-phase sync, and 45V rating. | Suitable for 12V/24V industrial systems but not 45V automotive load-dump or cold-crank scenarios. | Choose only if design operates strictly below 36V and does not require CISPR25 Class 5 EMI certification. |
Compared with MP4436AGR-Z, MPQ4436AGRE-A adds automotive qualification and higher thermal margin, while LM61460QWRNRQ1 offers lower IQ but sacrifices 45V capability, FSS, and synchronization-making MP4436AGR-Z optimal for demanding automotive power rails requiring both robustness and EMI control.
Availability
MP4436AGR-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP4436AGR-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 core expertise in DC-DC converters, LED drivers, and motor drivers.
The MP4436/MP4436A product line targets automotive and industrial applications requiring wide-input, high-current, low-quiescent-power buck regulation with advanced EMI mitigation and thermal resilience.
FAQ
What is the difference between MP4436 and MP4436A?
The MP4436A includes Frequency Spread Spectrum (FSS) for reduced EMI emissions, enabling compliance with CISPR25 Class 5 standards. The MP4436 lacks FSS but shares identical pinout, electrical specs, and package. MP4436AGR-Z corresponds to the MP4436A variant.
Can MP4436AGR-Z operate with 3.3V input?
Yes - its 3.3V minimum input enables operation during automotive cold-crank conditions. In low-dropout mode, it sustains regulation even when VIN approaches VOUT + 0.5V, supporting 5V output down to ~5.5V input and 3.3V output down to ~3.8V input.
How is multi-phase operation implemented?
Multi-phase operation uses SYNCIN to align switching edges across multiple ICs, SYNCO to generate 180° out-of-phase clocks, and ICS pins tied together to equalize current sharing. Up to four phases are supported with proper PCB layout and component matching.
What is the recommended BST capacitor value?
A 0.1μF X7R ceramic capacitor rated ≥16V is recommended between BST and SW pins. Its value is derived from gate charge requirements and switching frequency; larger values improve high-side drive stability but increase board area.
Does MP4436AGR-Z support external soft-start adjustment?
Yes - an external capacitor from SS pin to GND sets soft-start time. The internal 6μA current source charges the capacitor linearly; a 100nF capacitor yields ~17ms ramp time, limiting inrush current during power-up.
Is thermal derating required at 6A continuous load?
At TA = 85°C on a 4-layer JEDEC PCB (θJA = 44°C/W), maximum power dissipation is ~1.5W. With typical 92% efficiency at 12V→5V/6A, power loss is ~2.6W - requiring heatsinking or airflow. Derating to ~4.5A is advised without thermal enhancement.
What failure protections are built-in?
MP4436AGR-Z includes hiccup-mode over-current protection, thermal shutdown (170°C), input UVLO (2.65V falling), output PG monitoring, and valley-current limiting. These operate independently to prevent damage during short-circuit, overtemperature, or input dropout events.
MP4436AGR-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- 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):
- 3.3V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- Current - Output:
- 6A
- Frequency - Switching:
- 350kHz ~ 530kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
MP4436AGR-Z FAQ
1.How can I place an order for MP4436AGR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4436AGR-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 MP4436AGR-Z reliable?
The price and inventory of MP4436AGR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4436AGR-Z is usually 5 days.
3.What payment methods are accepted for MP4436AGR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4436AGR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4436AGR-Z?
MP4436AGR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4436AGR-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 MP4436AGR-Z?
For technical support, including MP4436AGR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4436AGR-Z requirements.
6.How does Aetrix verify that MP4436AGR-Z is sourced from the original manufacturer or authorized distributors?
All MP4436AGR-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 MP4436AGR-Z meets industry standards.
7.What is the process for return or replacement of MP4436AGR-Z?
All MP4436AGR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4436AGR-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 MP4436AGR-Z part is unused and in its original packaging.
Return procedure for MP4436AGR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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