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Monolithic Power Systems Inc. MP4420GJ-P
- Part No.:
- MP4420GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP4420GJ-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:954
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Product details
Overview
MP4420GJ-P 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, featuring 410kHz default switching frequency, power-good (PG) output, and automotive-grade 36V transient tolerance for load dump protection. It operates in current-mode control for fast transient response and supports external clock synchronization from 200kHz to 2.2MHz.
For engineers reviewing the MP4420GJ-P datasheet, MP4420GJ-P pinout, MP4420GJ-P application, or MP4420GJ-P equivalent, key selection considerations include its TSOT23-8 package footprint, internal soft-start (1.5ms), thermal shutdown (170°C), hiccup-mode over-current protection, and adjustable output voltage down to 0.8V via resistor divider feedback.
Technical Context
The MP4420GJ-P employs peak-current-mode control with an internal 0.8V reference and optimized compensation network, eliminating need for external loop compensation components. Its bootstrap driver supports high-duty-cycle operation (up to 95%) and includes dedicated UVLO (2.2V rising) for floating gate drive stability.
It integrates a 5V internal bias regulator powered from VIN, with VCC decoupling required at Pin 7; EN/SYNC (Pin 6) serves dual function - digital enable input with 1.4V typical threshold and external clock sync input with 200kHz–2.2MHz acceptance range and <1.7μs pulse width requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous; withstands 36V transients - enables direct connection to automotive battery rails including load dump events. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and communication interfaces in compact embedded systems. |
| Switching Frequency | Default 410kHz; synchronizable 200kHz–2.2MHz - allows EMI optimization and avoids noise-sensitive bands in multi-rail systems. |
| Feedback Reference | 792mV typ (780–804mV) - sets precise output voltage via external resistor divider; supports outputs as low as 0.8V. |
| Power Good Threshold | 90% of VFB rising / 84% falling - provides reliable system power sequencing and fault detection with 90μs delay. |
| Thermal Shutdown | 170°C activation with 30°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Quiescent Current | 0.7mA typ at 12V input - enables low-power standby modes in always-on automotive or industrial monitoring nodes. |
Pinout & Package
MP4420GJ-P is housed in an 8-pin TSOT23 package - ultra-compact surface-mount outline (2.9mm × 1.6mm × 0.85mm height) with exposed pad for thermal enhancement. Pin 4 (GND) is the thermal and signal reference; layout requires wide copper traces for IN (Pin 2), SW (Pin 3), and BST (Pin 5), plus tight placement of 0.1μF VCC (Pin 7) and 22μF input capacitors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain power-good indicator | Pulled low during startup or fault; rises after VOUT reaches 90% of target - used for system reset or enable sequencing. |
| 2 (IN) | Main input supply rail | Accepts 4–30V; requires local 22μF + 0.1μF ceramic decoupling; trace must be wide and short to minimize input ripple and EMI. |
| 3 (SW) | Switch node | Connects to inductor; carries high di/dt; routing must avoid sensitive analog nodes (e.g., FB) and include 20Ω series resistor to BST cap. |
| 4 (GND) | System ground reference | Primary thermal and signal return; requires solid copper pour with multiple vias to inner ground plane. |
| 5 (BST) | Bootstrap capacitor connection | Forms floating supply for high-side gate driver; requires 0.1–1μF ceramic cap between BST and SW; 20Ω resistor strongly recommended. |
| 6 (EN/SYNC) | Enable control & external clock input | Logic-high (>1.4V) enables regulation; external 200kHz–2.2MHz clock synchronizes switching edge - eliminates beat frequencies. |
| 7 (VCC) | Bias supply output | Internally regulated ~5V output; must be decoupled with 0.1–0.22μF ceramic cap placed adjacent to pin - no larger capacitance allowed. |
| 8 (FB) | Feedback voltage sense | Compares divided output voltage to 0.792V reference; T-network configuration recommended for low-VOUT designs to improve stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 90mΩ HS / 55mΩ LS RDS(ON) - reduces conduction loss and eliminates external FET selection, simplifying BOM and layout. |
| Automotive Cold-Crank Support | 95% max duty cycle - maintains regulation down to 3.3V input, critical for engine start-up in 12V vehicle systems. |
| Frequency Fold-Back | Activates below 660mV FB - lowers switching frequency during short-circuit to limit peak inductor current and thermal stress. |
| Internal Soft-Start | 1.5ms ramp time - prevents output overshoot and inrush current during power-up, eliminating need for external timing components. |
| Power-Save Mode | Automatic light-load efficiency optimization - transitions to pulse-skipping mode below ~200mA to maintain >85% efficiency at 1mA load. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Rail |
|---|---|
|
Use Scenario: Powering MCU, CAN transceiver, and sensor interface circuitry in door module or lighting controller under varying battery conditions (cold-crank to load dump). IC Role / Device Role / Timing Role: Primary 3.3V/2A point-of-load regulator; handles 36V transients and sustains operation down to 3.3V input during cranking. Use Value: Eliminates need for external TVS and pre-regulator stages; reduces board area by 40% vs. discrete buck + LDO solution. |
Use Scenario: Generating stable 5V rail for digital I/O isolation, ADC reference, and fieldbus PHY in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Synchronous buck converter with PG output used for power sequencing and watchdog reset assertion. Use Value: Delivers 92% peak efficiency at full load while meeting EN 61000-4-5 surge immunity requirements via inherent 36V rating. |
| Distributed Telecom Power Supply | Medical Sensor Hub |
|
Use Scenario: Local 3.3V conversion from 24V backplane in remote radio head or baseband unit with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (410kHz) synchronous buck with external clock sync capability to align switching edges across multiple rails. Use Value: Enables deterministic noise spectrum placement and reduces conducted emissions by >10dB compared to free-running oscillators. |
Use Scenario: Powering low-noise analog front-end, Bluetooth LE SoC, and EEPROM in portable patient monitor with battery backup. IC Role / Device Role / Timing Role: Efficient 2A step-down regulator with ultra-low quiescent current (0.7mA) and hiccup-mode OCP for safety-critical fault containment. Use Value: Extends battery life by 22% versus legacy controllers; PG signal triggers firmware-initiated safe shutdown on undervoltage. |
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 | Higher 3.5A rating, 2.1MHz max fSW, wettable flank QFN-16 package; requires external compensation. | Better suited for higher-current, space-constrained applications where PCB real estate allows larger QFN and layout complexity is acceptable. | Choose LM61480RQWR when >2A output or >1MHz switching is required; MP4420GJ-P remains optimal for cost-sensitive, TSOT23-footprint designs. |
| TPS54202HDDCR | 2A rating, 4.5–17V input, 500kHz fixed fSW, no sync capability, smaller 6-pin SOT-23 package but no PG or BST resistor recommendation. | Limited to mid-range automotive/industrial inputs; lacks 36V transient tolerance and cold-crank support. | Select TPS54202HDDCR only for non-automotive 12V systems where sync, PG, and extended input range are not needed. |
Compared with LM61480RQWR and TPS54202HDDCR, MP4420GJ-P uniquely balances automotive robustness (36V transient, cold-crank), compact TSOT23-8 footprint, and feature completeness (PG, sync, fold-back, hiccup) - making it the most integrated 2A buck solution for space-constrained, safety-aware embedded power rails.
Availability
MP4420GJ-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, distributed telecom systems, and medical sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MP4420GJ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP4420 product line delivers highly integrated, thermally efficient synchronous buck converters targeting automotive, industrial, and communications equipment where small size, high reliability, and transient resilience are essential.
FAQ
What is the maximum allowable input voltage transient for MP4420GJ-P?
The MP4420GJ-P is rated for 36V input transients, specifically designed to survive automotive load dump events per ISO 7637-2 Pulse 5a. Absolute maximum VIN is 40V, but sustained operation above 30V is not recommended. The device enters shutdown if junction temperature exceeds 170°C during transient stress.
Can MP4420GJ-P operate with an input voltage below 4V?
No - the MP4420GJ-P has a guaranteed minimum operating input of 4V due to internal UVLO thresholds (rising at 3.5V, falling at 3.3V). Below 4V, the internal 5V bias regulator cannot sustain core logic, and the high-side MOSFET driver fails to bootstrap. For cold-crank support, it maintains regulation down to 3.3V input only when enabled and already running.
Is an external bootstrap diode required for MP4420GJ-P?
No - the MP4420GJ-P uses an internal floating regulator to charge the BST capacitor and does not require an external bootstrap diode. However, adding a 1N4148 diode between VCC/VOUT and BST (with series resistor) is optional and improves efficiency at high duty cycles (>65%), such as in 5V-to-3.3V conversion with 12V input.
How is output voltage accuracy affected by resistor tolerance in the FB divider?
Output voltage error is directly proportional to resistor tolerance: with 1% R1 and R2, total VOUT error is ±2.2% (including 792mV reference tolerance). Using 0.5% resistors reduces error to ±1.3%. The T-network configuration (R1+RT) further improves accuracy and stability for low-VOUT designs by reducing FB node impedance sensitivity.
Does MP4420GJ-P support forced PWM mode at light loads?
No - MP4420GJ-P automatically enters power-save mode (pulse-skipping) below ~200mA load to maintain high efficiency. It does not offer forced continuous conduction mode (FCCM); disabling power-save would require external circuitry to hold EN high and modulate FB, which is unsupported and invalidates specifications.
What is the recommended minimum BST capacitor value and dielectric type?
A 0.1μF X7R or X5R ceramic capacitor is the minimum recommended BST capacitor, placed directly between BST (Pin 5) and SW (Pin 3). Larger values (up to 1μF) improve high-duty-cycle stability but increase board area. Avoid Y5V or Z5U dielectrics due to voltage coefficient drift affecting bootstrap voltage regulation.
How does the hiccup-mode over-current protection behave during sustained short-circuit?
When FB drops below 84% of reference (≈670mV), MP4420GJ-P enters hiccup mode: it disables switching for ~10ms, then attempts restart. This limits average short-circuit current to ~300mA, preventing thermal runaway. Recovery occurs automatically once the fault is removed and FB rises above 90% of reference.
MP4420GJ-P 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-P FAQ
1.How can I place an order for MP4420GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4420GJ-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 MP4420GJ-P reliable?
The price and inventory of MP4420GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4420GJ-P is usually 5 days.
3.What payment methods are accepted for MP4420GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4420GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4420GJ-P?
MP4420GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4420GJ-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 MP4420GJ-P?
For technical support, including MP4420GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4420GJ-P requirements.
6.How does Aetrix verify that MP4420GJ-P is sourced from the original manufacturer or authorized distributors?
All MP4420GJ-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 MP4420GJ-P meets industry standards.
7.What is the process for return or replacement of MP4420GJ-P?
All MP4420GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4420GJ-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 MP4420GJ-P part is unused and in its original packaging.
Return procedure for MP4420GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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