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Monolithic Power Systems Inc. MP1494SGJ-P
- Part No.:
- MP1494SGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1494SGJ-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,640
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Product details
Overview
MP1494SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 150mΩ high-side and 70mΩ low-side MOSFETs, delivering up to 2A continuous output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable output voltage down to 0.8V - deployed in notebook I/O power, flat-panel TV logic rails, and distributed point-of-load systems.
For engineers reviewing the MP1494SGJ-P datasheet, MP1494SGJ-P pinout, MP1494SGJ-P application, or MP1494SGJ-P equivalent, this device supports AAM power-save mode, external clock synchronization (300kHz–2MHz), internal soft-start (1.5ms), thermal shutdown (150°C), and hiccup-mode over-current protection - critical for compact, thermally constrained 2A POL designs.
Technical Context
The MP1494SGJ-P employs peak-current-mode control with an internal 0.807V feedback reference and optimized compensation, enabling stable regulation under wide line/load transients. Its synchronous rectification architecture eliminates external diode losses, while the bootstrap gate driver (BST pin) sustains high-side MOSFET operation with regulated 5V floating supply.
Operation includes programmable Advanced Asynchronous Modulation (AAM) via dedicated pin for light-load efficiency optimization, EN/SYNC dual-function pin supporting enable control and external clock synchronization, and frequency fold-back (at 0.5× fSW when FB < 400mV) for short-circuit protection - all implemented within a single TSOT-23-8 die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V intermediate bus rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for FPGA core/logic rails, USB PD sink supplies, and SoC I/O domains. |
| Switching Frequency | Fixed 500kHz (±18%) - balances EMI, inductor size (e.g., 3.3–5.5μH), and efficiency in space-constrained layouts. |
| RDS(ON) (HS/LS) | 150mΩ / 70mΩ - enables >90% efficiency at 12VIN/3.3VOUT/2A with minimal thermal derating. |
| Feedback Reference | 0.807V ±1.5% - sets output accuracy and enables precise resistor-divider-based VOUT programming (e.g., 1.0V–5.0V). |
| Soft-Start Time | 1.5ms - prevents inrush current and output overshoot during power-up of sensitive downstream circuitry. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
Pinout & Package
MP1494SGJ-P is housed in an 8-pin TSOT-23 package (JEDEC MO-193BA), with 0.65mm pitch, exposed thermal pad (not electrically connected), and pin 1 identified by dot marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AAM) | Advanced Asynchronous Modulation control | Adjusts light-load transition threshold between AAM and CCM; ties to VCC or divider to optimize ripple vs. efficiency. |
| 2 (IN) | Main power input | Accepts 4.5V–16V; requires local 22μF ceramic + 0.1μF high-frequency decoupling near pin. |
| 3 (SW) | Power switch node | Connects to inductor and bootstrap capacitor; demands short/wide copper trace to minimize ringing and EMI. |
| 4 (GND) | Power and signal ground reference | Primary return path for high di/dt currents; must connect directly to large ground plane with multiple vias. |
| 5 (BST) | Bootstrap supply for high-side driver | Requires 0.1μF ceramic cap between BST and SW; 10Ω series resistor recommended to damp voltage spikes. |
| 6 (EN/SYNC) | Enable input / external clock sync | Logic-high (>1.15V) enables regulator; accepts 300kHz–2MHz square wave for frequency synchronization. |
| 7 (VCC) | Internal bias regulator output | 5V regulated supply for internal circuitry; decoupled with 0.1–0.22μF ceramic cap placed adjacent to pin. |
| 8 (FB) | Feedback voltage sense | Compares output divider voltage to 0.807V reference; trace must be short, shielded from SW/BST noise. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky loss, enabling >92% efficiency at 12V→3.3V/2A without heatsinking. |
| AAM power-save mode | Reduces light-load quiescent current to 0.5mA while maintaining regulation stability and low output ripple. |
| Frequency fold-back protection | Halves switching frequency during short-circuit (FB < 400mV), limiting peak inductor current and thermal stress. |
| Integrated 5V bias regulator | Self-powered from VIN across full input range; removes need for external LDO or charge pump for gate drive. |
| Hiccup-mode OCP | Enters periodic restart after over-current fault, reducing average short-circuit power dissipation by >70% vs. latch-off. |
Applications
| Notebook I/O Power | Digital Set-Top Box SoC Rails |
|---|---|
Use Scenario: Providing clean 3.3V/2A power to USB 3.0 controllers, PCIe switches, and display interface ICs in ultrabooks. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps up to 1.5A/μs with minimal output droop. Use Value: Internal compensation and 500kHz operation enable <1000μF total output capacitance, saving board area versus lower-frequency alternatives. |
Use Scenario: Generating 1.2V/2A core voltage for ARM-based media processors in cable/satellite STBs. IC Role / Device Role / Timing Role: Point-of-load converter with AAM mode active during video decode idle cycles to reduce system standby power. Use Value: 0.807V reference tolerance (±1.5%) ensures processor VDD compliance across temperature, avoiding brown-out resets. |
| Flat-Panel Monitor Logic Supply | Distributed Telecom Power |
Use Scenario: Delivering 5.0V/2A to timing controllers (TCON), LVDS transmitters, and backlight drivers in 24" LCD monitors. IC Role / Device Role / Timing Role: Secondary buck stage fed from 12V intermediate bus, synchronized to system clock to suppress beat frequencies. Use Value: EN/SYNC pin allows alignment to 1MHz master clock, reducing conducted EMI peaks in CISPR-22 Class B testing. |
Use Scenario: Local 2.5V/2A supply for FPGA configuration memory and transceiver banks in remote radio units (RRUs). IC Role / Device Role / Timing Role: Isolated POL regulator operating from -48V-derived 12V rail, requiring robust UVLO (3.8V rising) and thermal resilience. Use Value: 150°C thermal shutdown with 20°C hysteresis prevents latch-up in sealed, convection-limited enclosures. |
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 |
|---|---|---|---|
| RT7272BGSP | Higher 3A rating, 600kHz fSW, but no AAM mode or SYNC capability; RDS(ON) 110mΩ/85mΩ. | Lacks light-load efficiency tuning and EMI synchronization - less suitable for battery-backed or noise-sensitive displays. | Select when higher output current headroom is required and thermal margin exceeds 25°C above ambient. |
| TPS54202DGQR | 2A rating, 4.5–17V input, but uses external MOSFETs; no integrated power stage; 400kHz–2.5MHz adjustable fSW. | Requires 4 external FETs and gate drivers - increases BOM count, layout complexity, and footprint vs. MP1494SGJ-P's single-chip solution. | Prefer when design requires custom MOSFET selection for ultra-low Qg or specific avalanche rating. |
Compared with RT7272BGSP and TPS54202DGQR, MP1494SGJ-P uniquely combines integrated dual MOSFETs, AAM light-load optimization, and SYNC capability in an 8-pin TSOT-23 - offering the smallest footprint and lowest component count for 2A POL applications below 16V input.
Availability
MP1494SGJ-P is available at Aetrix Electronics and suitable for notebook I/O power, flat-panel monitor logic supplies, and distributed telecom power requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP1494SGJ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP1494SGJ-P belongs to MPS's MP149x family of compact synchronous buck converters, engineered specifically for space-constrained, high-efficiency point-of-load applications in consumer and computing electronics.
FAQ
What is the minimum output voltage achievable with MP1494SGJ-P?
The MP1494SGJ-P supports output voltages down to 0.8V, set by the internal 0.807V feedback reference and external resistor divider. At 0.8V, the FB pin voltage equals the reference; lower outputs require external resistive scaling or T-network configurations per datasheet Figure 4.
Does MP1494SGJ-P require an external bootstrap diode?
No. The MP1494SGJ-P integrates a bootstrap charging circuit that regulates BST voltage using internal MOSFETs and does not require an external diode. A 0.1μF ceramic capacitor between BST and SW pins suffices, with a 10Ω series resistor recommended to suppress switching node ringing.
How does the AAM pin affect light-load efficiency?
The AAM pin sets the threshold at which the converter transitions from forced PWM (CCM) to discontinuous conduction mode (DCM) during light loads. Driving AAM to ~1.2V–1.8V (via resistor divider from VCC) enables AAM mode, reducing quiescent current to 0.5mA and improving efficiency at loads below 100mA.
Can MP1494SGJ-P synchronize to a 1MHz external clock?
Yes. The EN/SYNC pin accepts external clock signals from 300kHz to 2MHz. When driven with a 1MHz square wave, the internal oscillator locks to the external edge, enabling EMI reduction through frequency spreading or alignment with system clocks in multi-rail designs.
What is the maximum allowable input voltage for continuous operation?
The absolute maximum input voltage is 17V, but the recommended operating range is 4.5V to 16V. Sustained operation above 16V risks exceeding internal MOSFET breakdown limits and may trigger thermal shutdown due to increased conduction and switching losses.
Is the TSOT-23-8 package thermally enhanced?
The TSOT-23-8 package has no exposed thermal pad; its θJA is 100°C/W on a 4-layer JEDEC PCB. For 2A operation at high ambient temperatures, PCB layout must include generous copper pour on top/bottom layers connected to GND pin via ≥4 thermal vias to maintain junction temperature below 125°C.
Does MP1494SGJ-P support output discharge during shutdown?
No. The MP1494SGJ-P lacks an integrated output discharge FET. During shutdown, the output remains floating unless an external resistor or dedicated discharge circuit is added across the output capacitor to meet fast-voltage-fall requirements.
MP1494SGJ-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):
- 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-P FAQ
1.How can I place an order for MP1494SGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1494SGJ-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 MP1494SGJ-P reliable?
The price and inventory of MP1494SGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1494SGJ-P is usually 5 days.
3.What payment methods are accepted for MP1494SGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1494SGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1494SGJ-P?
MP1494SGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1494SGJ-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 MP1494SGJ-P?
For technical support, including MP1494SGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1494SGJ-P requirements.
6.How does Aetrix verify that MP1494SGJ-P is sourced from the original manufacturer or authorized distributors?
All MP1494SGJ-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 MP1494SGJ-P meets industry standards.
7.What is the process for return or replacement of MP1494SGJ-P?
All MP1494SGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1494SGJ-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 MP1494SGJ-P part is unused and in its original packaging.
Return procedure for MP1494SGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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