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Monolithic Power Systems Inc. MP1494SGJ-Z
- Part No.:
- MP1494SGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1494SGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:10,886
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Product details
Overview
MP1494SGJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC delivering 2A continuous output current, operating from 4.5V–16V input, with fixed 500kHz switching frequency and internal 150mΩ/70mΩ MOSFETs. It integrates soft-start, over-current protection with hiccup mode, thermal shutdown, and AAM power-save mode for high-efficiency operation in space-constrained I/O power rails.
For engineers reviewing the MP1494SGJ-Z datasheet, MP1494SGJ-Z pinout, MP1494SGJ-Z application, or MP1494SGJ-Z equivalent, this device supports precise output voltage adjustment (0.8V–VIN×0.95), external clock synchronization (300kHz–2MHz), and robust thermal management in TSOT23-8 packaging-key for notebook, monitor, and distributed power system designs.
Technical Context
The MP1494SGJ-Z employs peak-current-mode control with internal 0.807V feedback reference and optimized compensation to ensure stable regulation across line and load variations. Its current-mode architecture enables fast transient response and simplifies loop design without external compensation components.
It features an integrated 5V bias regulator powered from VIN, bootstrap charging circuitry with BST-SW clamp protection, and EN/SYNC dual-function pin supporting both enable control and external clock synchronization-enabling deterministic timing alignment in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial and consumer input rails including 5V, 12V, and 15V bus systems. |
| Output Current | 2A continuous - sufficient for powering core logic, FPGAs, and interface ICs in compact embedded systems. |
| Switching Frequency | Fixed 500kHz (±18%) - balances EMI performance and inductor size; synchronizable to 300kHz–2MHz external clock. |
| Feedback Reference | 0.807V ±1.5% - enables accurate output voltage setting down to 0.8V with standard resistor dividers. |
| Internal MOSFET RDS(on) | HS: 150mΩ, LS: 70mΩ - reduces conduction loss and improves full-load efficiency without external switches. |
| Protection Features | OCP with hiccup mode, thermal shutdown at 150°C (20°C hysteresis), UVLO (3.8V rising threshold) - ensures safe operation under fault conditions. |
| Soft-Start Time | 1.5ms - prevents output overshoot and inrush current during power-up in sensitive downstream circuits. |
Pinout & Package
MP1494SGJ-Z is housed in an 8-pin TSOT23-8 package with exposed pad for thermal enhancement. Pin 1 is located at the lower-left corner when viewing top marking left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AAM) | Advanced Asynchronous Modulation control | Configures light-load operation mode: low voltage forces AAM (improved ripple/stability); high voltage forces CCM (better transient/efficiency). |
| 2 (IN) | Main input supply connection | Accepts 4.5V–16V input; requires local 22μF ceramic decoupling capacitor with short, wide PCB trace. |
| 3 (SW) | Switch node | Drives external inductor; high dv/dt node requiring careful layout to minimize EMI and ringing. |
| 4 (GND) | Power and signal ground reference | Common return path for IN, SW, FB, VCC; must connect to solid ground plane with multiple vias. |
| 5 (BST) | Bootstrap supply for high-side driver | Requires 0.1μF capacitor between BST and SW; 10Ω series resistor recommended to damp SW spikes. |
| 6 (EN/SYNC) | Enable and external clock input | Logic-high (>1.15V) enables converter; accepts 300kHz–2MHz external clock for synchronized operation. |
| 7 (VCC) | Bias supply output | Internally regulated 5V rail; requires 0.1–0.22μF ceramic capacitor placed adjacent to pin and GND. |
| 8 (FB) | Feedback input | Compares output voltage divider tap against 0.807V reference; high-impedance node requiring short trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Power-Save Mode | Automatically transitions to discontinuous conduction mode below ~300mA load, reducing quiescent current to 0.5mA while maintaining regulation. |
| Synchronous Rectification | Eliminates external Schottky diode, improving full-load efficiency by up to 8% versus asynchronous designs at 2A. |
| Integrated Bootstrap Circuit | Self-charging BST supply enables reliable high-side gate drive without external charge pump, simplifying BOM and layout. |
| Fold-Back Frequency Control | Reduces switching frequency to ~250kHz when FB drops below 400mV, limiting peak inductor current during short-circuit faults. |
| Thermal Hiccup Protection | Enters periodic restart cycle upon thermal shutdown or sustained over-current, limiting average power dissipation and preventing thermal runaway. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box SoC Core Supply |
|---|---|
Use Scenario: Providing clean, regulated 3.3V/2A power to USB controllers, PCIe bridges, and display interface ICs in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients from burst-mode peripherals. Use Value: AAM mode maintains >85% efficiency at 10mA idle current while delivering <20mV output ripple during 1A step loads. |
Use Scenario: Generating 1.2V/2A core voltage for ARM-based media processors in cable/satellite STBs with strict thermal envelope limits. IC Role / Device Role / Timing Role: High-density point-of-load regulator with tight output tolerance (±1%) and fast load-step response (<5μs). Use Value: Internal 0.807V reference and current-mode control achieve ±0.5% line/load regulation across -40°C to +85°C ambient. |
| Flat-Panel Monitor Logic Supply | Distributed 5V Power System |
Use Scenario: Delivering 5V/2A to timing controllers (TCON), LVDS transmitters, and backlight drivers in 24-inch LCD monitors. IC Role / Device Role / Timing Role: Main DC-DC stage converting 12V system rail to isolated logic supply with low EMI signature. Use Value: Fixed 500kHz frequency and optimized layout guidelines reduce conducted EMI below CISPR-22 Class B limits without shielding. |
Use Scenario: Serving as modular POL converter in industrial gateway devices requiring multiple independent 3.3V/2A rails. IC Role / Device Role / Timing Role: Synchronized buck controller enabling phase-shifted operation across parallel converters to reduce input ripple current. Use Value: EN/SYNC pin allows precise clock alignment across up to four MP1494SGJ-Z units, cutting total input capacitance requirement by 40%. |
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 |
|---|---|---|---|
| RT7290BZQW | Higher 2.5A rating, 600kHz fixed frequency, no AAM mode, requires external bootstrap diode | Better suited for higher-current applications but lacks light-load efficiency optimization | Select when >2A peak load or tighter frequency tolerance (±5%) is required; avoid if ultra-low IQ at light load is critical |
| TPS54202DRCT | 2A rating, 400kHz–2.5MHz adjustable frequency, integrated compensation, 3.5V–28V input range | Broader input range and programmable frequency, but larger 10-pin WSON package and higher quiescent current (25μA vs 0.5mA) | Prefer for designs needing >16V input or flexible frequency tuning; MP1494SGJ-Z remains optimal for space-constrained 12V systems prioritizing light-load efficiency |
Compared with RT7290BZQW and TPS54202DRCT, MP1494SGJ-Z delivers superior light-load efficiency via AAM mode, occupies minimal board area in TSOT23-8, and provides simpler layout with integrated bootstrap-making it ideal for cost-sensitive, space-limited 4.5V–16V applications where 2A output suffices.
Availability
MP1494SGJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC supplies, flat-panel monitor logic rails, and distributed 5V power systems requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MP1494SGJ-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 MP1494S product line targets compact, high-efficiency DC-DC conversion for consumer and computing applications-emphasizing integration, thermal resilience, and ease of use in space-constrained layouts.
FAQ
What is the minimum output voltage achievable with MP1494SGJ-Z?
The MP1494SGJ-Z supports output voltages down to 0.8V, set by the internal 0.807V feedback reference and external resistor divider. For outputs below 1.0V, the datasheet recommends using a T-type feedback network to maintain accuracy and stability, as shown in Figures 4 and 12.
Does MP1494SGJ-Z require an external bootstrap diode?
No. The MP1494SGJ-Z integrates a floating high-side driver with internal bootstrap charging circuitry. Only a 0.1μF ceramic capacitor between BST and SW pins is required; adding a 10Ω resistor in series is strongly recommended to suppress SW node ringing.
How does the AAM pin affect efficiency and stability?
The AAM pin sets the light-load transition threshold between asynchronous (AAM) and continuous conduction (CCM) modes. Lower AAM voltage improves ripple and stability but reduces light-load efficiency; higher voltage improves transient response and efficiency at light loads but may compromise stability-typical design uses 0.5V.
Can MP1494SGJ-Z operate with input voltage below 4.5V?
No. The absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions. Below this, the internal UVLO circuit disables the device. The absolute maximum input is 17V, but continuous operation above 16V violates specification and risks damage.
What is the purpose of the fold-back frequency feature?
Fold-back frequency reduces switching frequency to ~250kHz when FB voltage falls below 400mV-typically during output short-circuit events. This lowers peak inductor current and power dissipation, preventing thermal runaway while maintaining hiccup-mode protection.
Is the TSOT23-8 package thermally enhanced?
Yes. The TSOT23-8 package includes an exposed thermal pad on the bottom surface, which must be soldered to a PCB copper pour connected to the GND plane. Thermal resistance θJA is specified at 100°C/W on a 4-layer JEDEC test board, confirming its suitability for 2A continuous operation with proper layout.
MP1494SGJ-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):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15.2V
- Current - Output:
- 2A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP1494SGJ-Z FAQ
1.How can I place an order for MP1494SGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1494SGJ-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 MP1494SGJ-Z reliable?
The price and inventory of MP1494SGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1494SGJ-Z is usually 5 days.
3.What payment methods are accepted for MP1494SGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1494SGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1494SGJ-Z?
MP1494SGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1494SGJ-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 MP1494SGJ-Z?
For technical support, including MP1494SGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1494SGJ-Z requirements.
6.How does Aetrix verify that MP1494SGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP1494SGJ-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 MP1494SGJ-Z meets industry standards.
7.What is the process for return or replacement of MP1494SGJ-Z?
All MP1494SGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1494SGJ-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 MP1494SGJ-Z part is unused and in its original packaging.
Return procedure for MP1494SGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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