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Monolithic Power Systems Inc. MPQ4418AGJ-AEC1-Z
- Part No.:
- MPQ4418AGJ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ4418AGJ-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MPQ4418AGJ-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering up to 0.6A continuous output current across a 4V–36V input range, featuring internal 90mΩ high-side and 55mΩ low-side MOSFETs, 410kHz default switching frequency, and power-good (PG) monitoring - deployed in automotive body control modules for stable 3.3V/5V rail generation.
For engineers reviewing the MPQ4418AGJ-AEC1-Z datasheet, MPQ4418AGJ-AEC1-Z pinout, MPQ4418AGJ-AEC1-Z application, or MPQ4418AGJ-AEC1-Z equivalent, key selection criteria include cold-crank support (≥92% duty cycle), hiccup-mode OCP for short-circuit resilience, TSOT23-8 thermal performance (θJA = 100°C/W), and EN/SYNC dual-function interface for enable control or external clock synchronization.
Technical Context
The MPQ4418AGJ-AEC1-Z employs peak-current-mode control with internal compensation, enabling fast transient response and inherent loop stability without external type-II/type-III networks. Its 410kHz fixed-frequency oscillator supports external synchronization from 200kHz to 2.2MHz via the EN/SYNC pin, allowing EMI optimization in dense automotive PCB layouts.
It integrates a 5V internal VCC regulator powered from VIN, bootstrap circuitry with BST pin for high-side gate drive, and a dedicated error amplifier comparing FB voltage (792mV typ.) against a precision 0.8V reference. Thermal shutdown activates at 170°C with 30°C hysteresis, and UVLO thresholds are fixed at 3.5V (rising) / 3.3V (falling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports full automotive battery range including cold-crank (4.5V min) and load-dump (36V max) transients. |
| Output Current | 0.6A continuous - sufficient for MCU cores, CAN transceivers, and sensor interfaces in compact ECUs. |
| Switching Frequency | 410kHz default, 200kHz–2.2MHz syncable - enables layout-driven EMI tuning and avoids AM band interference. |
| Feedback Reference | 792mV ±12mV - sets precise output voltage via resistor divider; enables 0.8V–33V programmable VOUT with <±1% regulation error. |
| Power Good Threshold | 90% of VFB rising, 84% falling - provides clean, glitch-filtered (90μs deglitch) rail-valid signal for system sequencing. |
| Thermal Shutdown | 170°C activation, 140°C recovery - protects silicon during sustained overload or poor heatsinking in sealed enclosures. |
| OCP Mechanism | Cycle-by-cycle current limit + hiccup mode - limits average short-circuit current to ~150mA, minimizing thermal stress during fault conditions. |
Pinout & Package
MPQ4418AGJ-AEC1-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.9mm), optimized for high-power density in space-constrained automotive modules. Exposed pad improves θJC (55°C/W) and requires solder connection to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PG | Open-drain power-good indicator | Pulled high when VOUT ≥ 90% of target; 90μs deglitch ensures immunity to brief dips during load transients. |
| 2 IN | Main input supply connection | Accepts 4V–36V; requires local 22μF + 0.1μF ceramic decoupling placed within 2mm of pin to suppress switching noise. |
| 3 SW | Internal switch node | Connects to inductor; high di/dt path requiring tight loop area with BST and GND to minimize EMI and voltage spikes. |
| 4 GND | Power and signal reference ground | Must be connected to large copper pour with multiple vias; serves as return for HS/LS FETs, PG, and FB feedback network. |
| 5 BST | Bootstrap capacitor connection | Requires 0.1μF–1μF ceramic cap between BST and SW; 20Ω series resistor recommended to damp ringing during high-duty-cycle operation. |
| 6 EN/SYNC | Enable input / external clock input | Pull ≥1.4V to enable; apply 200kHz–2.2MHz square wave for frequency sync; internal 500kΩ pull-down enables default disable state. |
| 7 VCC | Bias supply for internal circuitry | Internally regulated 5V output; decoupled with 0.1μF–0.22μF ceramic cap placed adjacent to pin and GND. |
| 8 FB | Feedback voltage sensing input | Monitors resistor divider output; 10nA bias current enables high-impedance dividers (e.g., 41.2kΩ/13kΩ for 3.3V) with minimal error. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HS/LS MOSFETs | 90mΩ/55mΩ RDS(ON) - eliminates external FETs and drivers, reducing BOM count and layout complexity in 12V/24V systems. |
| Forced CCM Operation | Enables continuous conduction mode down to zero load - prevents audible noise and maintains regulation during ultra-light loads (e.g., sleep-mode ECUs). |
| AEC-Q100 Grade 1 Qualification | -40°C to +125°C TJ operation - validated for under-hood automotive applications with guaranteed reliability over 15-year vehicle lifetime. |
| High-Duty-Cycle Capability | 95% max duty cycle - sustains regulation during cold-crank events where VIN drops to 4.5V while maintaining 3.3V/5V outputs. |
| Internal Soft Start | 1.5ms typical ramp time - prevents inrush current and VOUT overshoot during ignition-on startup, eliminating need for external SS capacitor. |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment Power Supply |
|---|---|
|
Use Scenario: Regulating 3.3V for microcontroller, LIN transceiver, and door-lock actuator logic in BCM subassembly. IC Role / Device Role / Timing Role: Primary buck converter supplying always-on and ignition-switched rails with cold-crank hold-up and load-dump tolerance. Use Value: 92% duty cycle and 4V–36V input range ensure uninterrupted operation during engine start (4.5V) and alternator surge (36V), meeting ISO 7637-2 Pulse 5a/b requirements. |
Use Scenario: Generating 5V for display backlight driver and audio codec in head-unit mainboard. IC Role / Device Role / Timing Role: Secondary buck stage following primary 12V-to-5V conversion, providing low-noise, tightly regulated 5V with PG signaling for safe boot sequencing. Use Value: PG pin's 90μs deglitch and 6% hysteresis prevent false resets during transient load steps, ensuring reliable display initialization and audio playback startup. |
| Industrial CAN Node Power | Automotive ADAS Camera Module |
|
Use Scenario: Powering isolated CAN FD transceiver and microcontroller in distributed I/O node operating from 24V industrial bus. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 3.3V with hiccup-mode OCP to survive field-wiring shorts without latch-up or thermal runaway. Use Value: Cycle-by-cycle current limit + hiccup recovery limits average fault current to <200mA, enabling self-recovery after cable short without manual reset or fuse replacement. |
Use Scenario: Providing 1.8V core supply for image signal processor (ISP) and 3.3V I/O supply for MIPI CSI-2 interface in rear-view camera ECU. IC Role / Device Role / Timing Role: Dual-rail buck converter supporting low-noise analog/RF sections and digital logic with independent soft-start timing. Use Value: Internal compensation and forced CCM eliminate external compensation components and prevent light-load frequency shift, preserving EMI profile across all operating modes. |
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 |
|---|---|---|---|
| MPQ4420AGJ-AEC1-Z | Higher 2A output current, same 4V–36V input, identical TSOT23-8 package and pinout. | Targets higher-power domains (e.g., radar SoC, multi-camera hubs) where 0.6A is insufficient. | Select when >0.6A continuous load or higher peak current margin is required; footprint-compatible upgrade path. |
| TI TPS54332DR | 3A output, 3.5V–28V input, SOIC-8 package; no AEC-Q100 qualification; external compensation required. | Suitable for non-automotive industrial designs where qualification isn't mandated and board space allows SOIC. | Choose only for cost-sensitive, non-automotive applications where AEC-Q100 and TSOT23-8 size are not required. |
Compared with MPQ4418AGJ-AEC1-Z, MPQ4420AGJ-AEC1-Z offers scalable current capacity in identical automotive-qualified packaging, while TPS54332DR trades qualification and integration for higher current and lower unit cost in non-automotive contexts - making MPQ4418A the optimal balance of size, qualification, and efficiency for sub-1A automotive rails.
Availability
MPQ4418AGJ-AEC1-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN nodes, and ADAS camera modules requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MPQ4418AGJ-AEC1-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 manufacturing partnerships.
The MPQ4418A belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for under-hood and cabin electronics demanding AEC-Q100 compliance, wide input range, and robust fault protection in harsh environments.
FAQ
What is the minimum input voltage required for reliable startup?
The MPQ4418AGJ-AEC1-Z has a fixed UVLO with a rising threshold of 3.5V and falling threshold of 3.3V. Reliable startup occurs when VIN exceeds 3.5V; operation continues down to 3.3V before shutdown. For cold-crank scenarios below 4.5V, its 95% max duty cycle maintains regulation - verified per ISO 16750-2.
Can the switching frequency be adjusted without an external clock source?
No - the MPQ4418AGJ-AEC1-Z has a fixed 410kHz internal oscillator. Frequency adjustment requires applying a 200kHz–2.2MHz square-wave clock to the EN/SYNC pin; no resistor or capacitor programming is supported. The internal frequency is not trimmable.
Is an external bootstrap diode required for proper operation?
No - the MPQ4418AGJ-AEC1-Z includes an internal bootstrap regulator and does not require an external diode. However, an optional 1N4148 diode can be added between VCC/VOUT and BST to improve efficiency above 65% duty cycle, per Figure 7 in the datasheet.
How is output voltage accuracy affected by resistor tolerance in the FB divider?
With a 792mV ±12mV reference and typical 1% resistors, total VOUT error is ≤±1.5% at room temperature. Using 0.5% resistors reduces this to ≤±1.0%. The FB pin's 10nA bias current introduces negligible error (<0.02%) even with 100kΩ total divider resistance.
Does the device support forced PWM mode at light loads?
Yes - the MPQ4418AGJ-AEC1-Z operates in Forced Continuous Conduction Mode (FCCM) across the entire load range, including zero load. This eliminates frequency shifting and associated EMI spread, ensuring consistent EMC behavior during sleep-mode operation.
What is the maximum allowable BST capacitor value?
The datasheet specifies a recommended BST capacitor range of 0.1μF to 1μF. Values exceeding 1μF are not characterized and may cause startup delay or instability due to excessive charge time; 0.22μF X7R ceramic is the most commonly validated value for robust performance.
How does the hiccup-mode OCP behave during sustained short-circuit conditions?
When FB voltage falls below 84% of VREF (indicating severe overload), the device enters hiccup mode: it shuts down for ~20ms, then attempts restart. This limits average power dissipation to <150mW, preventing thermal damage while enabling automatic recovery once the fault is removed - no external latch or reset required.
MPQ4418AGJ-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 600mA
- Frequency - Switching:
- 410kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MPQ4418AGJ-AEC1-Z FAQ
1.How can I place an order for MPQ4418AGJ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4418AGJ-AEC1-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 MPQ4418AGJ-AEC1-Z reliable?
The price and inventory of MPQ4418AGJ-AEC1-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4418AGJ-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4418AGJ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4418AGJ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4418AGJ-AEC1-Z?
MPQ4418AGJ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4418AGJ-AEC1-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 MPQ4418AGJ-AEC1-Z?
For technical support, including MPQ4418AGJ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4418AGJ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4418AGJ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4418AGJ-AEC1-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 MPQ4418AGJ-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4418AGJ-AEC1-Z?
All MPQ4418AGJ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4418AGJ-AEC1-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 MPQ4418AGJ-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4418AGJ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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