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Monolithic Power Systems Inc. MP4420GJ-Z
- Part No.:
- MP4420GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP4420GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
MP4420GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 90mΩ high-side and 55mΩ low-side MOSFETs, delivering up to 2A continuous output current across a 4V–30V input range and supporting 36V transient tolerance. It operates at a default 410kHz switching frequency, features power-good (PG) signaling, internal soft-start, and thermal shutdown-designed for automotive cold-crank and load-dump environments.
For engineers reviewing the MP4420GJ-Z datasheet, MP4420GJ-Z pinout, MP4420GJ-Z application, or MP4420GJ-Z equivalent, this device is selected for compact, high-efficiency 3.3V/5V point-of-load regulation in space-constrained automotive and industrial systems where input transients, duty-cycle headroom, and hiccup-mode short-circuit protection are critical design requirements.
Technical Context
The MP4420GJ-Z employs peak-current-mode control with an internal 0.8V reference and optimized compensation, enabling stable regulation without external loop components. Its bootstrap gate driver supports high-duty-cycle operation (>92%) and integrates UVLO (3.5V rising / 3.3V falling) on both VCC and floating driver rails.
It implements cycle-by-cycle over-current protection with hiccup mode activation when FB falls below 84% of VREF, and includes synchronized frequency adjustment (200kHz–2.2MHz) via the EN/SYNC pin. The open-drain PG output asserts after 90μs delay when VOUT reaches 90% of target and deasserts during thermal shutdown, EN disable, or output undervoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous; supports 36V transient - enables direct connection to automotive battery rails including load dump events. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Switching Frequency | Default 410kHz; adjustable 200kHz–2.2MHz via EN/SYNC - allows EMI optimization and inductor size trade-offs. |
| Feedback Reference | 792mV typical (780–804mV) - sets precise output voltage with external resistor divider; enables 0.8V minimum VOUT. |
| Power Good Threshold | 90% of VFB rising / 84% falling - provides reliable system power sequencing and fault detection with 6% hysteresis. |
| Thermal Shutdown | 170°C trip / 140°C recovery - protects against sustained overload or poor PCB thermal design while enabling automatic restart. |
| Max Duty Cycle | 95% - ensures regulation down to ~1.2V output under 12V input, critical for automotive cold-crank (6V start). |
Pinout & Package
MP4420GJ-Z is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts and thermally efficient mounting with exposed pad grounding (per JEDEC MO-193BA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain Power Good | Signals valid output regulation; requires external pull-up to VCC or bias rail; asserts high after 90μs when VOUT ≥ 90% of setpoint. |
| 2 (IN) | Main Input Supply | Accepts 4–30V DC; connects to bulk input capacitor; must be routed with wide, low-inductance trace to minimize switching noise. |
| 3 (SW) | Switch Node | Drives external inductor; carries high di/dt; requires tight layout coupling with BST and GND to reduce ringing and EMI. |
| 4 (GND) | System Ground Reference | Primary return path for power and feedback; must connect directly to large copper pour with multiple vias to inner ground plane. |
| 5 (BST) | Bootstrap Supply | Charges high-side gate driver via external capacitor between BST and SW; 20Ω series resistor recommended to damp SW spikes. |
| 6 (EN/SYNC) | Enable & External Clock Input | Logic-high (>1.4V) enables operation; external clock (200kHz–2.2MHz) synchronizes internal oscillator for EMI reduction. |
| 7 (VCC) | Bias Regulator Output | Internally regulated ~4.9V supply for control circuitry; decoupled with 0.1µF ceramic capacitor placed adjacent to pin. |
| 8 (FB) | Feedback Input | Monitors output via resistor divider; internal 0.8V reference enables precise VOUT setting; sensitive node requiring short, shielded routing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | 90mΩ HS / 55mΩ LS RDS(ON) - eliminates external diode, improves full-load efficiency by >5% vs. asynchronous designs. |
| Automotive Transient Robustness | 36V input transient tolerance + 4V–30V operating range - meets ISO 7637-2 pulse 5a/b requirements without external TVS. |
| Hiccup-Mode OCP | Enters periodic restart when FB < 84% VREF - limits average short-circuit current to ~1A, preventing thermal runaway. |
| High-Duty-Cycle Operation | 95% max duty cycle - sustains regulation during 6V cold-crank events with 3.3V output, avoiding dropout. |
| Internal Soft-Start | 1.5ms ramp time - prevents inrush current and output overshoot during startup without external components. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering CAN transceivers, LIN interface ICs, and sensor signal conditioners in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3V/2A point-of-load regulator converting 12V battery rail; manages cold-crank dips and load-dump surges autonomously. Use Value: Eliminates need for external TVS and discrete MOSFETs; 95% duty cycle maintains regulation at 6V input, ensuring uninterrupted CAN bus operation. |
Use Scenario: Generating isolated 5V logic supply for digital input/output cards in programmable logic controllers. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter replacing larger TO-220-based solutions; operates continuously at 65°C ambient. Use Value: TSOT23-8 footprint reduces board area by >70% vs. SO-8 alternatives; hiccup-mode OCP prevents field failures during wiring faults. |
| Distributed Telecom Power | Medical Sensor Hub |
|
Use Scenario: Local 3.3V supply for FPGA configuration, Ethernet PHYs, and PMBus controllers in remote radio units. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock (2.2MHz) to shift switching noise away from sensitive RF bands. Use Value: EN/SYNC pin enables deterministic EMI placement; 410kHz base frequency avoids interference with 2.4GHz ISM band harmonics. |
Use Scenario: Powering low-noise analog front-ends (ADCs, op-amps) and Bluetooth LE radios in portable diagnostic devices. IC Role / Device Role / Timing Role: Efficient, low-ripple 3.3V source with PG monitoring to validate power integrity before sensor sampling begins. Use Value: PG output triggers MCU wake-up only after VOUT stabilizes within ±1%; soft-start prevents ADC reference disturbance during boot. |
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 |
|---|---|---|---|
| LM61480RQWR | 3.5V–36V input, 8A output, 2.1MHz fixed freq, QFN-16 package | Higher current, larger footprint, no hiccup-mode OCP - suited for multi-rail systems needing higher power density | Select when >2A output or QFN thermal performance is required; not drop-in due to pinout and control differences. |
| TPS54202HDDCR | 4.5V–28V input, 2A output, 500kHz–2.2MHz sync, 6-pin SOT-23 | Lacks BST pin and internal high-side FET driver; requires external bootstrap diode; lower max duty cycle (90%) | Choose for cost-sensitive non-automotive apps where 36V transient immunity and cold-crank support are unnecessary. |
Compared with LM61480RQWR and TPS54202HDDCR, MP4420GJ-Z uniquely balances automotive-grade transient resilience, compact TSOT23-8 packaging, hiccup-mode fault containment, and seamless cold-crank operation - making it optimal for space-constrained 2A loads where reliability under battery rail stress is non-negotiable.
Availability
MP4420GJ-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and distributed telecom power systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MP4420GJ-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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP4420 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for harsh-environment applications demanding high input transient tolerance, extended duty cycle, and integrated protection - targeting body electronics, ADAS subsystems, and industrial control.
FAQ
What is the maximum allowable input voltage transient for MP4420GJ-Z?
The MP4420GJ-Z supports 36V input transients per its absolute maximum rating, enabling direct connection to 12V automotive battery rails without external clamping. This rating covers ISO 7637-2 Pulse 5a (35V/100ms) and Pulse 5b (28V/400ms) load-dump events, provided PCB layout minimizes inductance on the IN trace and input capacitance is adequately rated.
Can MP4420GJ-Z operate reliably during automotive cold-crank conditions?
Yes - with a 95% maximum duty cycle and 4V minimum operating input, MP4420GJ-Z maintains regulation down to 6V input while delivering 2A at 3.3V output. Its internal UVLO (3.3V falling threshold) and high-duty-cycle capability ensure uninterrupted operation during engine cranking, unlike converters limited to 90% duty cycle or higher VIN minima.
How does the hiccup-mode over-current protection function?
When output short-circuit causes FB voltage to fall below 84% of the 0.8V reference, MP4420GJ-Z enters hiccup mode: it disables switching, waits ~10ms, then attempts restart. This limits average short-circuit current to ~1A, reducing junction temperature rise and preventing thermal damage - confirmed in bench characterization per datasheet Section 14.
Is an external bootstrap diode required for normal operation?
No - the MP4420GJ-Z includes an internal bootstrap charging circuit that regulates BST voltage to ~5V using VIN and SW. An external diode (e.g., 1N4148) is optional and only recommended for high-duty-cycle applications (>65%) to improve efficiency by reducing BST capacitor discharge losses; it is not needed for standard 3.3V/5V outputs.
What is the purpose of the 20Ω resistor between BST and SW pins?
The 20Ω resistor damps high-frequency ringing at the SW node caused by parasitic inductance and BST capacitor resonance. It reduces voltage spikes that could trigger false over-voltage protection or degrade MOSFET reliability. MPS strongly recommends this resistor in all designs, especially with high-current inductors or long PCB traces.
Does MP4420GJ-Z require external compensation components?
No - the MP4420GJ-Z uses an internally compensated current-mode architecture with optimized transconductance amplifier and pole-zero placement. Only the external feedback resistor divider (R1/R2) and output capacitor ESR are part of the stability loop; no additional RC networks or type-II/type-III compensators are needed for stable operation across all load and input conditions.
How is Power Good (PG) timing validated in production?
PG assertion delay (90μs typical) and threshold (90% of VFB) are characterized during bench validation per datasheet Section 5 but are not 100% tested in production. The PG function relies on internal comparator accuracy and RC timing - design margin is built into the 86.5–93.5% rising threshold spec to ensure robustness across temperature and process variation.
MP4420GJ-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):
- 30V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 27V
- Current - Output:
- 2A
- Frequency - Switching:
- 410kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP4420GJ-Z FAQ
1.How can I place an order for MP4420GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4420GJ-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 MP4420GJ-Z reliable?
The price and inventory of MP4420GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4420GJ-Z is usually 5 days.
3.What payment methods are accepted for MP4420GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4420GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4420GJ-Z?
MP4420GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4420GJ-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 MP4420GJ-Z?
For technical support, including MP4420GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4420GJ-Z requirements.
6.How does Aetrix verify that MP4420GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP4420GJ-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 MP4420GJ-Z meets industry standards.
7.What is the process for return or replacement of MP4420GJ-Z?
All MP4420GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4420GJ-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 MP4420GJ-Z part is unused and in its original packaging.
Return procedure for MP4420GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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