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Monolithic Power Systems Inc. MP9442GJ-Z
- Part No.:
- MP9442GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP9442GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,783
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Product details
Overview
MP9442GJ-Z 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 (PG) indication, internal soft-start, and hiccup-mode over-current protection-designed for automotive cold-crank and industrial distributed power systems.
For engineers reviewing the MP9442GJ-Z datasheet, MP9442GJ-Z pinout, MP9442GJ-Z application, or MP9442GJ-Z equivalent, key selection criteria include its 36V max input rating, TSOT23-8 package footprint, PG threshold accuracy (±3.5% of VFB), thermal shutdown at 170°C, and external clock synchronization capability from 200kHz to 2.2MHz.
Technical Context
The MP9442GJ-Z employs peak-current-mode control with internal compensation, enabling fast transient response and stable loop behavior without external type-II/III networks. Its AAM (Advanced Asynchronous Modulation) light-load mode reduces quiescent current to 0.7mA while maintaining regulation via pulse-frequency modulation.
Bootstrap gate drive supports high-duty-cycle operation up to 93%, critical for automotive cold-crank (e.g., 4.5VIN → 3.3VOUT). The open-drain PG pin asserts after VFB exceeds 90% of 792mV reference with 90μs delay, and deasserts at 84% with hysteresis-enabling precise system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V continuous - supports wide automotive battery transients and industrial 24V rails. |
| Output Current | 2A continuous - sustained under full thermal derating in TSOT23-8 package at +85°C ambient. |
| Switching Frequency | 600kHz fixed (±16.7%) - enables compact magnetics; synchronizable to 200kHz–2.2MHz external clock. |
| Feedback Reference | 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 accurate rail-valid signaling with 6% hysteresis for noise immunity. |
| Thermal Shutdown | 170°C activation / 140°C recovery - protects die during overload; includes 30°C hysteresis to prevent oscillation. |
| Quiescent Current | 0.7mA typical at 12VIN - ensures low standby power in always-on automotive modules. |
Pinout & Package
MP9442GJ-Z is housed in an 8-pin TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad (GND-connected) for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power good indicator | Pulled low until VFB ≥ 90% × 792mV; delays 90μs before asserting high - enables safe system enable sequencing. |
| 2 - IN | Main input supply connection | Accepts 4V–36V; requires local 22μF + 0.1μF ceramic decoupling; routed with wide trace to minimize impedance. |
| 3 - SW | Switch node | Connects to inductor and bootstrap capacitor; high dv/dt node requiring careful layout to reduce EMI and ringing. |
| 4 - GND | System ground reference | Primary return path for power and feedback; must connect directly to thermal pad and large copper pour for thermal and noise control. |
| 5 - BST | Bootstrap supply for high-side driver | Requires 0.1μF–1μF capacitor to SW; 20Ω series resistor recommended to damp SW spike coupling into BST. |
| 6 - EN/SYNC | Enable and external clock input | Logic-high (>1.4V) enables operation; accepts 200kHz–2.2MHz square wave for frequency synchronization. |
| 7 - VCC | Bias supply for internal circuitry | Internally regulated 4.9V output; decoupled with 0.1μF ceramic placed adjacent to pin to stabilize gate drivers. |
| 8 - FB | Feedback input for output voltage sensing | Compares against 792mV reference; connects to resistor divider tap - sensitive analog node requiring short, shielded routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | 90mΩ HS / 55mΩ LS RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and board area. |
| Automotive Cold-Crank Support | 93% max duty cycle - maintains regulation down to 4.5VIN at 3.3VOUT, meeting ISO 16750-2 Pulse 4 requirements. |
| Internal Soft-Start | 1.45ms ramp time - prevents inrush current and output overshoot during power-up without external components. |
| Hiccup-Mode Over-Current Protection | Trips at 4.2A typical, then cycles on/off - limits average short-circuit current to <100mA, preventing thermal runaway. |
| Power-Save Mode (AAM) | Reduces IQ to 0.7mA at light load - extends battery life in always-on telematics and sensor nodes. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and display interface in head-unit under 9V–16V battery input with cold-crank dips to 4.5V. IC Role / Device Role / Timing Role: Primary 2A buck regulator providing stable 3.3V rail; PG signal sequences MCU boot after valid VOUT establishment. Use Value: 93% duty cycle sustains regulation during cold-crank; 600kHz switching allows small 10μH inductor; TSOT23-8 fits tight dashboard space constraints. |
Use Scenario: Generating isolated 5V/2A supply for digital I/O expansion cards in 24V industrial control cabinets with wide ambient temperature range. IC Role / Device Role / Timing Role: Main DC-DC stage converting 24V bus to 5V logic rail; thermal shutdown and hiccup mode protect against field wiring faults. Use Value: 36V absolute max input withstands 24V system surges; -40°C to +125°C operating range matches PLC environmental specs; PG confirms rail stability before enabling field outputs. |
| Distributed Telecom Power | Medical Point-of-Care Sensor Hub |
|
Use Scenario: Local 3.3V conversion for FPGA configuration and Ethernet PHY in remote radio unit powered from 48V PoE-derived supply. IC Role / Device Role / Timing Role: Intermediate buck stage stepping 48V down to 3.3V; synchronized to system clock to reduce EMI in RF-sensitive environment. Use Value: External clock sync (200kHz–2.2MHz) aligns switching edge with baseband timing; low 0.7mA IQ minimizes standby loss in sleep-mode radios. |
Use Scenario: Providing clean, sequenced 3.3V supply to low-noise ADC, wireless BLE SoC, and optical sensors in portable diagnostic device. IC Role / Device Role / Timing Role: Primary power regulator with PG used to release reset on precision analog front-end after VOUT settles within ±1%. Use Value: 792mV ±1.5% reference ensures <±10mV output tolerance; low 10nA FB bias current avoids resistor-divider error; TSOT23-8 enables miniaturized wearable form factor. |
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, 2.1mm × 1.6mm QFN-10 package; higher current, no PG pin. | Targets higher-power applications (e.g., motor control); lacks power-good signaling required for safety-critical sequencing. | Select when >2A output or lower thermal resistance is needed; avoid if PG-driven system startup is mandatory. |
| TPS54202HDDCR | 4.5V–28V input, 2A output, 600kHz, integrated PG; but only 28V max input and no sync capability. | Suitable for 24V industrial systems but fails cold-crank (4.5VIN) due to UVLO at 4.3V; no external clock sync. | Choose for cost-sensitive 24V-only designs where sync and 36V margin are unnecessary; verify UVLO compatibility with battery profile. |
Compared with LM61480RQWR and TPS54202HDDCR, MP9442GJ-Z uniquely balances 36V input, 2A output, PG signaling, and 200kHz–2.2MHz sync in a space-constrained TSOT23-8 - making it optimal for automotive and ruggedized industrial edge nodes where all four attributes are simultaneously required.
Availability
MP9442GJ-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and distributed telecom power systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MP9442GJ-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 MP9442 belongs to MPS's high-voltage synchronous buck converter product line, engineered specifically for automotive-grade reliability, cold-crank operation, and minimal external component count in space-constrained embedded systems.
FAQ
What is the maximum allowable input voltage for MP9442GJ-Z?
The absolute maximum input voltage is 40V, but the recommended continuous operating range is 4V to 36V. Exceeding 36V may trigger overvoltage stress on internal structures, and operation above 40V risks permanent damage per Absolute Maximum Ratings. Designers should maintain ≤36V for reliable long-term use.
Does MP9442GJ-Z require an external bootstrap diode?
No external bootstrap diode is required for standard operation. The IC integrates bootstrap charging via internal circuitry. However, an external diode (e.g., 1N4148) is recommended when duty cycle exceeds 65% or input voltage falls below 5V to improve efficiency and ensure sufficient BST voltage during light-load PFM mode.
How does the Power Good (PG) pin behave during thermal shutdown?
During thermal shutdown, the PG pin is actively pulled low regardless of VFB level. This provides fail-safe signaling to downstream logic that the regulator has entered protection mode. PG remains low until both thermal recovery (TJ < 140°C) and VFB > 90% × 792mV are satisfied, with 90μs assertion delay upon recovery.
Can MP9442GJ-Z be synchronized to an external clock below 200kHz?
No. The EN/SYNC pin accepts external clocks only in the 200kHz to 2.2MHz range. Attempting synchronization below 200kHz results in undefined behavior - the internal oscillator reverts to its default 600kHz frequency. For sub-200kHz operation, use the internal oscillator or select a different controller.
What is the minimum output voltage achievable with MP9442GJ-Z?
The minimum regulated output voltage is 0.8V, set by the internal 792mV feedback reference and resistor-divider ratio. Output voltages below 0.8V are not supported - attempting such configurations causes the error amplifier to saturate and lose regulation control.
Is the TSOT23-8 package RoHS-compliant and lead-free?
Yes. MP9442GJ-Z is fully RoHS-compliant, lead-free, and halogen-free per MPS green policy. The TSOT23-8 package uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life at ≤30°C/85% RH.
How does the hiccup-mode over-current protection operate during a sustained short circuit?
Under sustained short circuit, MP9442GJ-Z enters hiccup mode after FB drops below 84% of 792mV: it shuts down for ~10ms, then attempts restart. This cycle repeats, limiting average short-circuit current to ~50mA and die temperature to <125°C - preventing thermal damage while allowing automatic recovery once fault clears.
MP9442GJ-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):
- 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-Z FAQ
1.How can I place an order for MP9442GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9442GJ-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 MP9442GJ-Z reliable?
The price and inventory of MP9442GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9442GJ-Z is usually 5 days.
3.What payment methods are accepted for MP9442GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9442GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9442GJ-Z?
MP9442GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9442GJ-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 MP9442GJ-Z?
For technical support, including MP9442GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9442GJ-Z requirements.
6.How does Aetrix verify that MP9442GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP9442GJ-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 MP9442GJ-Z meets industry standards.
7.What is the process for return or replacement of MP9442GJ-Z?
All MP9442GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9442GJ-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 MP9442GJ-Z part is unused and in its original packaging.
Return procedure for MP9442GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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