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Monolithic Power Systems Inc. MP9442GJ-P
- Part No.:
- MP9442GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP9442GJ-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
MP9442GJ-P from Monolithic Power Systems is a synchronous step-down DC-DC converter delivering 2A continuous output current with 4V–36V input range, 600kHz fixed switching frequency, and integrated 90mΩ/55mΩ MOSFETs. It features power-good indication, internal soft-start, and hiccup-mode over-current protection-designed for automotive cold-crank and industrial distributed power rails.
For engineers reviewing the MP9442GJ-P datasheet, MP9442GJ-P pinout, MP9442GJ-P application, or MP9442GJ-P equivalent, key selection criteria include its 36V max input rating, TSOT23-8 package thermal performance (θJA = 100°C/W), PG threshold accuracy (±3.5% of VFB), and EN/SYNC dual-function pin behavior under external clock synchronization.
Technical Context
The MP9442GJ-P uses peak-current-mode control with internal compensation, enabling stable regulation across 0.8V–VIN×93% output range and fast transient response. Its AAM (Advanced Asynchronous Modulation) light-load mode reduces quiescent current to 0.7mA while maintaining regulation via pulse-skipping.
Bootstrap gate drive supports high-duty-cycle operation up to 93%, critical for automotive cold-crank (e.g., 4.5V VIN → 3.3VOUT). The 6.5V Zener-clamped EN/SYNC pin accepts external clocks from 200kHz to 2.2MHz and enables UVLO adjustment via resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V continuous - supports automotive battery transients and industrial 24V rails without external pre-regulation. |
| Output Current | 2A continuous - sustained at full load with thermal shutdown activation at 170°C junction temperature. |
| Switching Frequency | 600kHz fixed (±16.7%) - enables compact 10µH inductor and low-profile ceramic input/output capacitors. |
| Feedback Voltage | 792mV ±1.5% - sets output voltage via resistor divider; enables 0.8V minimum adjustable VOUT. |
| Power Good Threshold | 90% of VFB rising / 84% falling - provides precise rail-valid signaling with 90μs typical delay for system sequencing. |
| HS/LS RDS(ON) | 90mΩ / 55mΩ - minimizes conduction loss at 2A, achieving >92% efficiency at 12V→3.3V/2A. |
| Quiescent Current | 0.7mA typical - ensures low standby power in always-on industrial controllers. |
Pinout & Package
MP9442GJ-P is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density and thermal dissipation (θJA = 100°C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled low during startup/fault; asserts high after VOUT reaches 90% of target with 90μs delay - enables safe processor reset sequencing. |
| 2 - IN | Main input supply rail | Accepts 4V–36V; requires local 22µF + 0.1µF ceramic decoupling; wide PCB trace mandatory for 2A pulsed input current. |
| 3 - SW | Switch node | Connects to external inductor; carries high di/dt; routing must avoid FB/EN/SYNC to prevent noise coupling. |
| 4 - GND | System ground reference | Primary return path for power and feedback; requires direct copper pour + multiple vias to inner ground plane. |
| 5 - BST | Bootstrap capacitor connection | Forms floating supply for HS gate driver; 20Ω series resistor recommended to suppress SW ringing during high-dV/dt transitions. |
| 6 - EN/SYNC | Enable input / external clock sync | Logic-high (>1.4V) enables regulation; 200kHz–2.2MHz external clock synchronizes switching edge - eliminates beat frequencies in multi-rail systems. |
| 7 - VCC | Bias supply output | 5V regulated output (±6% load regulation); powers internal circuitry; requires 0.1µF ceramic decoupling placed <1mm from pin. |
| 8 - FB | Feedback voltage sense | Monitors resistor-divider output; high-impedance (100nA max bias) - sensitive to layout; T-network recommended for low-VOUT designs. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (4V–36V) | Enables single-supply operation across automotive (cold-crank 4.5V) and industrial 24V/36V systems without input stage complexity. |
| Synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by >30% vs. asynchronous designs at 2A load. |
| Internal soft-start (1.45ms) | Prevents output overshoot and inrush current during power-up - critical for FPGA and microcontroller supply sequencing. |
| Hiccup-mode over-current protection | Limits average short-circuit current to <500mA during fault, preventing thermal runaway and enabling self-recovery after fault removal. |
| Thermal shutdown (170°C) | Protects die integrity under sustained overload; 30°C hysteresis ensures stable restart only after sufficient cooling. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules and lighting controllers under 12V battery with cold-crank dips to 4.5V. IC Role / Device Role / Timing Role: Primary 3.3V/2A buck regulator with PG signal coordinating MCU boot sequence and CAN bus initialization. Use Value: 93% maximum duty cycle maintains regulation during cold-crank; PG delay ensures firmware executes only after stable VOUT. |
Use Scenario: Generating isolated 5V/2A rails for digital I/O expansion cards in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with EN/SYNC synchronized to PLC master clock to suppress EMI in dense backplane environments. Use Value: 600kHz switching avoids AM radio band; TSOT23-8 footprint saves board space versus SO-8 alternatives. |
| Distributed Telecom Power | Medical Diagnostic Sensor Supply |
|
Use Scenario: Local 3.3V conversion for FPGA-based packet processing units in remote radio heads powered from -48V telecom supplies via intermediate 12V rail. IC Role / Device Role / Timing Role: Secondary buck stage delivering low-noise, tightly regulated 3.3V with hiccup-mode protection against transient cable faults. Use Value: 0.7mA quiescent current extends backup runtime; PG signal triggers alarm if output drops below 3.0V. |
Use Scenario: Providing ultra-stable 1.8V/2A supply for high-resolution ADCs and analog front-ends in portable ultrasound probes with strict EMI limits. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source using ceramic output caps and optimized PCB layout per MPS guidelines. Use Value: AAM light-load mode maintains <15mV output ripple at 10mA; FB pin's 100nA bias minimizes divider error. |
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 max fSW, no internal BST resistor recommendation | Higher current capacity; suited for multi-rail systems requiring shared clock sync | Select when >2A output or >1MHz switching is required; requires external BST resistor design validation. |
| TPS54202HDDCR | 4.5V–28V input, 2A output, 500kHz–2.2MHz sync range, no PG pin | Lacks power-good signaling; lower max input voltage excludes 36V industrial use | Choose where PG is unnecessary and cost sensitivity outweighs 36V margin; verify EN pin Zener clamp compatibility. |
Compared with LM61480RQWR and TPS54202HDDCR, MP9442GJ-P uniquely combines 36V input tolerance, integrated PG, and validated TSOT23-8 thermal performance for space-constrained automotive and industrial 2A loads - making it optimal where input voltage margin and rail sequencing are non-negotiable.
Availability
MP9442GJ-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and distributed telecom power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP9442GJ-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 power ICs, with over two decades of expertise in DC-DC conversion and motor control solutions.
The MP9442 belongs to MPS's high-voltage synchronous buck converter product line, engineered specifically for automotive and industrial applications demanding wide input range, robust fault protection, and minimal external component count.
FAQ
What is the absolute maximum input voltage rating for MP9442GJ-P?
The absolute maximum input voltage is 40V, as specified in the Absolute Maximum Ratings table. Operation above 36V continuous violates recommended conditions and risks premature device failure due to overstress of internal MOSFETs and gate drivers. Sustained operation at 40V is not guaranteed and voids reliability specifications.
Can MP9442GJ-P operate with an input voltage below 4V?
No - the recommended operating condition specifies a minimum continuous input of 4V. Below this, the internal 5V VCC regulator cannot sustain proper biasing, causing erratic switching, loss of PG assertion, and potential hiccup-mode entry. The UVLO falling threshold is 3.3V, confirming functional cutoff near 3.5V.
How does the EN/SYNC pin function during external clock synchronization?
When an external clock (200kHz–2.2MHz) is applied to EN/SYNC, the internal oscillator locks to its rising edge - eliminating beat frequencies in multi-converter systems. The pin remains functional as an enable input: pulling it below 1.25V disables regulation regardless of clock presence, and the 6.5V Zener clamp protects against overvoltage.
What is the purpose of the BST pin's recommended 20Ω series resistor?
The 20Ω resistor between SW and BST dampens high-frequency ringing caused by parasitic inductance in the bootstrap loop. This reduces voltage spikes that could exceed the BST-to-SW absolute maximum rating (6V), preventing gate driver malfunction and improving long-term reliability - especially critical at high duty cycles (>65%).
Does MP9442GJ-P support adjustable output voltage below 0.8V?
No - the internal reference is fixed at 792mV ±1.5%, and the datasheet specifies "output adjustable from 0.8V" as the minimum achievable value. Attempting sub-0.8V outputs violates the feedback amplifier's common-mode range and results in regulation loss, as confirmed by the FB pin's 0.78V–0.804V min/max specification.
How does thermal shutdown interact with the PG pin?
Thermal shutdown forces immediate PG pin deassertion (pulls low), independent of output voltage level. This provides fail-safe system-level fault signaling: host processors can detect thermal events before junction temperature exceeds 170°C, enabling graceful shutdown or fan speed ramp-up prior to shutdown.
Is the TSOT23-8 package RoHS-compliant and lead-free?
Yes - all MPS parts, including MP9442GJ-P, are lead-free, halogen-free, and fully compliant with the EU RoHS directive. The top marking "ARZ" confirms the MP9442GJ variant, and green status documentation is available on the MPS Quality Assurance webpage.
MP9442GJ-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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 33V
- Current - Output:
- 2A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP9442GJ-P FAQ
1.How can I place an order for MP9442GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9442GJ-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 MP9442GJ-P reliable?
The price and inventory of MP9442GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9442GJ-P is usually 5 days.
3.What payment methods are accepted for MP9442GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9442GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9442GJ-P?
MP9442GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9442GJ-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 MP9442GJ-P?
For technical support, including MP9442GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9442GJ-P requirements.
6.How does Aetrix verify that MP9442GJ-P is sourced from the original manufacturer or authorized distributors?
All MP9442GJ-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 MP9442GJ-P meets industry standards.
7.What is the process for return or replacement of MP9442GJ-P?
All MP9442GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9442GJ-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 MP9442GJ-P part is unused and in its original packaging.
Return procedure for MP9442GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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