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Monolithic Power Systems Inc. MP4436GR-Z
- Part No.:
- MP4436GR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MP4436GR-Z.pdf
- Description:
- IC REG BUCK ADJ 6A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
MP4436GR-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 - deployed in ADAS camera modules requiring stable 5V/6A rail under wide VIN transients.
For engineers reviewing the MP4436GR-Z datasheet, MP4436GR-Z pinout, MP4436GR-Z application, or MP4436GR-Z equivalent, key selection criteria include its AAM/FCCM mode select capability, 100ns minimum on-time for high duty-cycle operation, thermal shutdown at 170°C, multi-phase synchronization via SYNCO/ICS, and QFN-20 (4mm×4mm) package with exposed thermal pad.
Technical Context
This current-mode controller integrates dual power MOSFETs and supports both advanced asynchronous mode (AAM) for light-load efficiency and forced continuous conduction mode (FCCM) for low-noise fixed-frequency operation. Its 180° out-of-phase SYNCO output enables interleaved multi-phase designs without external timing ICs.
The device implements frequency foldback during start-up to prevent inductor current runaway, uses symmetric VIN routing to reduce EMI, and features programmable soft-start via external capacitor on SS pin with 6µA constant current source. Feedback threshold is tightly regulated at 0.815V ±8mV 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 (4.5V) and load-dump (42V) conditions. |
| Output Current | 6A continuous - delivered with internal MOSFETs; no external switches required for typical 5V/3.3V rails. |
| Shutdown Current | 1.7μA - enables ultra-low-power sleep states in always-on automotive infotainment systems. |
| Switching Frequency | 350kHz to 530kHz (configurable via FREQ pin resistor) - optimized for EMI reduction and inductor size trade-off in car battery applications. |
| Feedback Voltage | 0.815V ±8mV - sets precise output voltage with external resistor divider; enables 3.3V, 5V, or custom VOUT with <±1% regulation error. |
| Power Good Threshold | 93% to 106% of nominal VOUT - open-drain PG signal asserts only when output is within tight window, supporting safe system boot sequencing. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while allowing recovery after cooling. |
Pinout & Package
MP4436GR-Z is housed in a thermally enhanced QFN-20 (4mm × 4mm) package with exposed thermal pad (EP) on underside for PCB-level heat dissipation. Pin 1 is marked by dot; top view orientation follows standard MPS QFN layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode select | High = FCCM (fixed-frequency); Low = AAM (pulse-skipping); must be actively pulled - not floated. |
| 2 SYNCIN | External clock input | Accepts 350–530kHz square wave; enables synchronization to master clock or multi-phase interleaving. |
| 3,12 VIN | Main input supply | Supplies control circuitry and high-side switch; requires local ceramic decoupling (≥10μF) near pins. |
| 4,5,10,11 PGND | Power ground | Low-impedance return path for high-current switching node; must connect directly to EP and input/output caps. |
| 6 BST | Bootstrap supply | Drives high-side gate; requires 0.1μF ceramic cap between BST and SW to sustain gate drive during 100% duty cycle. |
| 7,8 SW | Switch node | Connects to inductor; carries high di/dt; requires short, wide copper pour and minimal loop area with PGND. |
| 9 EN | Enable control | Active-high logic; 0.85V threshold rising edge enables regulator; 0.85V hysteresis prevents chatter. |
| 13 SYNCO | Synchronization output | 180° out-of-phase clock; floats when unused; drives SYNCIN of second MP4436GR-Z for 2-phase interleaving. |
| 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 node | In multi-phase: parallel ICS pins improve phase current balance; in single-phase: tie to VCC or VOUT ≥3V. |
| 16 VCC | Bias supply | Internal LDO output; powers gate drivers and logic; requires 1μF ceramic cap to PGND for stability. |
| 17 AGND | Analog ground | Reference for FB, SS, MODE, and internal error amp; must be separated from PGND and joined at single point. |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference enables accurate VOUT setting; sensitive to noise - keep trace short. |
| 19 SS | Soft-start control | 6µA current source charges external capacitor; controls ramp rate of VOUT to limit inrush current during startup. |
| 20 FREQ | Frequency programming | Resistor-to-GND sets fSW; 62kΩ yields 470kHz - balances EMI, efficiency, and inductor size for automotive use. |
Key Features
| Feature | Design Value |
|---|---|
| Low-dropout mode | Enables regulation down to VIN ≈ VOUT + 0.3V - critical for automotive cold-crank where battery drops to 4.5V while powering 5V loads. |
| Configurable switching frequency | 350–530kHz range via single FREQ-pin resistor - allows optimization for EMI compliance (CISPR 25 Class 5) or efficiency vs. size trade-offs. |
| Multi-phase capability | Synchronized 180° out-of-phase clock (SYNCO) and current-share (ICS) pins enable seamless 2-phase interleaving without external controllers. |
| Hiccup-mode overcurrent protection | Enters auto-retry shutdown on sustained overload - limits power dissipation and prevents thermal runaway during short-circuit faults. |
| Asymmetric gate drive architecture | Optimized high-side and low-side RDS(on) (48mΩ / 20mΩ) minimizes conduction loss across load range while maintaining fast switching transitions. |
Applications
| Automotive Infotainment Head Unit | ADAS Front-Facing Camera Module |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in head units operating from 9–16V battery with load-dump immunity. IC Role / Device Role / Timing Role: Primary 5V/6A buck converter delivering clean, regulated rail with hiccup-mode OCP and thermal shutdown. Use Value: 1.7μA shutdown current extends battery life during vehicle sleep; low-dropout mode maintains 5V output during 4.5V cold-crank events. |
Use Scenario: Supplies image sensor and ISP in forward collision warning systems requiring low-noise, EMI-compliant 3.3V/4A rail. IC Role / Device Role / Timing Role: Synchronous buck regulator with AAM/FCCM select and spread-spectrum option (MP4436A variant) for CISPR 25 Class 5 compliance. Use Value: Symmetric VIN routing and 180° SYNCO output reduce radiated emissions; 100ns min on-time supports high-duty-cycle operation at low VOUT. |
| Automotive Digital Instrument Cluster | Industrial 24V-to-5V Power Subsystem |
|
Use Scenario: Generates 5V for MCU, TFT backlight driver, and CAN transceiver in clusters exposed to -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Automotive-grade DC-DC converter with 170°C thermal shutdown, 45V max VIN, and robust PG signaling for fail-safe boot. Use Value: Tight VFB tolerance (±8mV) ensures <±1% output accuracy over temperature; QFN-20 package enables compact, thermally efficient layout. |
Use Scenario: Converts 24V industrial bus to isolated 5V logic rail in PLC I/O modules with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: High-efficiency synchronous buck providing 6A output with external soft-start and power-good monitoring for system supervision. Use Value: 18μA sleep-mode IQ reduces standby power in always-on equipment; multi-phase support scales to 12A+ using two MP4436GR-Z in interleaved configuration. |
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 |
|---|---|---|---|
| MPQ4436GR-A | Includes Frequency Spread Spectrum (FSS) for lower peak EMI; otherwise identical pinout, specs, and package. | Better suited for CISPR 25 Class 5 radiated emission compliance in automotive front-end electronics. | Select MPQ4436GR-A if EMI filtering margin is insufficient with standard MP4436GR-Z; no layout changes required. |
| LM61460QRPWRQ1 | 42V max VIN, 6A, 1.5μA shutdown IQ, but requires external MOSFETs; larger SO-POWERPAD package. | Higher BOM cost and board area due to discrete FETs; lacks integrated ICS/SYNCO for multi-phase scaling. | Choose only if qualification requires TI's AEC-Q100 Grade 1 certification; MP4436GR-Z offers higher integration and smaller footprint. |
Compared with MPQ4436GR-A, the MP4436GR-Z lacks FSS but delivers identical efficiency, thermal performance, and feature set at lower unit cost; versus LM61460QRPWRQ1, it eliminates external FETs and simplifies layout while maintaining automotive temperature range and reliability.
Availability
MP4436GR-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply with AEC-Q200-aligned manufacturing and long-term lifecycle support.
Supply support for MP4436GR-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 design centers in the US, China, and Taiwan, and global distribution.
The MP4436 product line targets automotive and industrial DC-DC conversion where high input voltage range, low quiescent current, and integrated MOSFETs reduce solution size and improve reliability in harsh environments.
FAQ
What is the maximum allowable junction temperature for MP4436GR-Z?
The absolute maximum junction temperature is +150°C, with thermal shutdown activating at +170°C and 20°C hysteresis. The device is rated for continuous operation up to +125°C junction temperature under recommended conditions, verified per JEDEC JESD51-7 thermal testing on 4-layer PCBs.
Can MP4436GR-Z operate with input voltage below 3.3V?
No - the minimum specified input voltage is 3.3V. Below this, UVLO prevents startup; the rising UVLO threshold is 3.0V typical, with 250mV hysteresis. Operation at 4.5V (cold-crank) is fully supported, but sub-3.3V inputs will disable regulation.
How is the switching frequency set, and what resistor value gives 470kHz?
Switching frequency is set by connecting a resistor from FREQ pin (20) to GND. Per the fSW vs. RFREQ curve, 62kΩ yields 470kHz typical. Values between 12kΩ (≈2MHz) and 100kΩ (≈350kHz) are supported, with tighter tolerance resistors improving frequency accuracy.
Is the MP4436GR-Z pin-compatible with the MP4436AGR-Z?
Yes - both share identical QFN-20 (4mm×4mm) footprint, pinout, and electrical specifications except that MP4436AGR-Z includes Frequency Spread Spectrum (FSS) for EMI reduction. No layout change is needed when upgrading from GR to AGR variant.
What is the recommended layout practice for the BST capacitor?
A 0.1μF X7R ceramic capacitor must be placed directly between BST and SW pins with minimal trace length and no vias. This ensures reliable high-side gate drive during 100% duty cycle; improper placement causes bootstrap depletion and erratic switching or dropout.
Does MP4436GR-Z support output voltages other than 3.3V and 5V?
Yes - output voltage is set by external resistor divider on FB pin using VFB = 0.815V reference. Common configurations include 1.2V (for core rails), 2.5V (for analog supplies), and 12V (with appropriate inductor and output cap), provided VIN > VOUT + dropout margin.
How does the AAM mode improve light-load efficiency?
AAM (Advanced Asynchronous Mode) skips switching pulses under light load, reducing gate drive and switching losses. At 10mA load, IQ drops to 18μA typical - enabling >85% efficiency at 0.1mA, critical for always-on automotive subsystems.
MP4436GR-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):
- 0.815V
- 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)
MP4436GR-Z FAQ
1.How can I place an order for MP4436GR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4436GR-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 MP4436GR-Z reliable?
The price and inventory of MP4436GR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4436GR-Z is usually 5 days.
3.What payment methods are accepted for MP4436GR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4436GR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4436GR-Z?
MP4436GR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4436GR-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 MP4436GR-Z?
For technical support, including MP4436GR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4436GR-Z requirements.
6.How does Aetrix verify that MP4436GR-Z is sourced from the original manufacturer or authorized distributors?
All MP4436GR-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 MP4436GR-Z meets industry standards.
7.What is the process for return or replacement of MP4436GR-Z?
All MP4436GR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4436GR-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 MP4436GR-Z part is unused and in its original packaging.
Return procedure for MP4436GR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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