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Monolithic Power Systems Inc. MP1494DJ-LF-P
- Part No.:
- MP1494DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1494DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
MP1494DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 100mΩ high-side and 40mΩ low-side MOSFETs, delivering up to 2A continuous output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–(VIN−3V) output voltage - deployed in notebook I/O power and flat-panel display supplies.
For engineers reviewing the MP1494DJ-LF-P datasheet, MP1494DJ-LF-P pinout, MP1494DJ-LF-P application, or MP1494DJ-LF-P equivalent, key selection criteria include its AAM power-save mode for light-load efficiency, thermal shutdown at 150°C, EN/SYNC dual-function pin for enable control or external clock synchronization (200kHz–2MHz), and TSOT-23-8 package constraints for compact PCB layout.
Technical Context
The MP1494DJ-LF-P uses peak-current-mode control with internal 0.807V feedback reference and optimized compensation, enabling stable regulation without external loop components. Its current-mode architecture delivers fast transient response and simplifies stability design across varying load and line conditions.
It integrates a 5V internal VCC regulator powered from VIN, bootstrap circuitry with BST pin requiring external SW–BST capacitor, and cycle-by-cycle over-current protection that triggers hiccup-mode recovery during output short-circuit faults - all operating within −40°C to +125°C junction temperature range.
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 systems. |
| Output Current | 2A continuous - sufficient for powering core logic, DDR memory I/O, or display bias rails. |
| Switching Frequency | Fixed 500kHz (±12%) - enables compact magnetics while balancing EMI and efficiency. |
| Feedback Reference | 0.807V ±20mV - sets precise output voltage via external resistor divider; supports 3.3V, 5V, 1.8V, and other common rails. |
| Internal MOSFET RDS(on) | HS: 100mΩ / LS: 40mΩ - minimizes conduction loss and improves full-load efficiency above 90%. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die under sustained overload or poor heatsinking; auto-recovery at ≤130°C. |
| Soft-Start Time | 1.5ms - prevents output overshoot and inrush current during power-up sequencing. |
Pinout & Package
MP1494DJ-LF-P is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND), requiring tight layout for thermal and noise performance. Pin 1 is bottom-left when top marking "ABZ" is read left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AAM | Advanced Asynchronous Modulation control | Adjusts light-load transition threshold between AAM and CCM modes; driven by resistor divider from VCC to GND. |
| 2 IN | Main input supply connection | Accepts 4.5V–16V; requires local 22μF ceramic decoupling capacitor placed near pin with wide copper trace. |
| 3 SW | Switch node | Drives external inductor; carries high di/dt; must be routed short and away from FB/VCC to minimize coupling. |
| 4 GND | Power and signal ground reference | Primary thermal path; connects to large ground plane with multiple vias beneath exposed pad. |
| 5 BST | Bootstrap supply for high-side driver | Requires 0.1μF–1μF capacitor between BST and SW; 10Ω series resistor recommended to damp ringing. |
| 6 EN/SYNC | Enable input / external clock sync | Logic-high (>1.4V) enables operation; external 200kHz–2MHz clock synchronizes switching edge. |
| 7 VCC | Bias supply output | Internally regulated 5V rail; decoupled with 0.1μF–0.22μF ceramic cap placed adjacent to pin and GND. |
| 8 FB | Feedback input | Compares output voltage against 0.807V reference; connects to resistor divider tap; sensitive to noise. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Power-Save Mode | Automatically transitions to discontinuous conduction mode below ~200mA load, reducing quiescent current to 0.5mA and improving light-load efficiency. |
| Synchronous Rectification | Integrated 100mΩ/40mΩ MOSFET pair eliminates external Schottky diode, increasing full-load efficiency by 5–8% versus asynchronous designs. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and simplified loop compensation - no external Type-II/III network required. |
| Integrated Soft-Start | 1.5ms internal ramp prevents output overshoot and limits inrush into bulk capacitance during startup. |
| Hiccup-Mode OCP | Enters periodic restart after current-limit fault, limiting average short-circuit power dissipation and preventing thermal runaway. |
Applications
| Notebook I/O Power | Digital Set-Top Box SoC Supply |
|---|---|
|
Use Scenario: Providing clean 3.3V/2A rail to USB controller, PCIe switch, or SATA PHY in ultrabook platforms. IC Role / Device Role / Timing Role: Primary buck regulator managing dynamic load steps up to 1.5A/μs while maintaining <±1% output regulation. Use Value: AAM mode extends battery runtime during idle states; 500kHz switching allows use of 2.2μH shielded inductors under 3mm height. |
Use Scenario: Generating 1.2V/2A core voltage for ARM-based media processor in cable/satellite STB. IC Role / Device Role / Timing Role: Main system PMIC buck stage with tight transient response to handle video decode bursts. Use Value: Internal 0.807V reference and current-mode control achieve <50mV undershoot on 1.5A step load; thermal shutdown ensures reliability in sealed enclosures. |
| Flat-Panel Monitor Logic Rail | Distributed 5V System Power |
|
Use Scenario: Delivering 5V/2A to timing controller (TCON) and LVDS transmitter in 24-inch LCD monitor. IC Role / Device Role / Timing Role: Secondary buck converter downstream of AC/DC adapter, rejecting 100Hz ripple and line transients. Use Value: 4.5V–16V input range accommodates unregulated 12V bus with ±10% tolerance; EN/SYNC pin enables power sequencing with main system controller. |
Use Scenario: Local point-of-load conversion from 12V backplane to 3.3V for FPGA configuration and peripheral interfaces. IC Role / Device Role / Timing Role: Compact, self-contained buck module minimizing BOM count and board area in multi-rail systems. Use Value: TSOT-23-8 footprint (2.9mm × 1.6mm) fits dense layouts; integrated MOSFETs eliminate gate-drive complexity and external diode footprint. |
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 |
|---|---|---|---|
| MP1476DJ-LF-Z | Higher 2.5A rating, 600kHz fSW, lower 75mΩ/35mΩ RDS(on), same TSOT-23-8 package. | Better suited for 3.3V/2.5A or 5V/2A loads with tighter thermal margin; supports higher-frequency magnetics. | Select when upgrading from MP1494DJ-LF-P for increased current headroom or improved efficiency above 1.5A. |
| RT7272BGJ8F | 4.5V–18V input, 2A, 500kHz, but uses external MOSFETs; no integrated power switches. | Requires external HS/LS FETs and driver, increasing BOM count and layout complexity; offers greater flexibility in FET selection. | Choose only if discrete FET optimization (e.g., ultra-low Qg, specific thermal profile) is mandatory and board area is not constrained. |
Compared with MP1494DJ-LF-P, MP1476DJ-LF-Z provides higher current capability and slightly better efficiency at full load, while RT7272BGJ8F trades integration for design flexibility - making MP1494DJ-LF-P optimal for cost-sensitive, space-constrained 2A applications where simplicity and rapid time-to-market are priorities.
Availability
MP1494DJ-LF-P 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 system power requiring stable component supply across production lifecycles.
Supply support for MP1494DJ-LF-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 MP1494 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for space-constrained consumer and computing applications demanding high efficiency, minimal external components, and robust protection features.
FAQ
What is the maximum recommended output current for MP1494DJ-LF-P under continuous operation?
The MP1494DJ-LF-P is rated for 2A continuous output current at TA = +25°C with proper PCB thermal design - including a solid ground plane, thermal vias under the exposed pad, and adequate copper area. Derating applies above 60°C ambient; at 85°C, max continuous current drops to ~1.5A per thermal simulation data in the datasheet.
Can MP1494DJ-LF-P synchronize to an external clock, and what frequency range is supported?
Yes - the EN/SYNC pin accepts an external TTL/CMOS clock signal from 200kHz to 2MHz. Synchronization occurs on the rising edge of the external clock, aligning with the internal oscillator. The external clock must have pulse width <1.7μs and be applied ≥2ms after output regulation is established to avoid startup instability.
Does MP1494DJ-LF-P require an external bootstrap diode, and when is it beneficial?
An external bootstrap diode (e.g., IN4148) from VCC to BST is optional but recommended when VOUT ≥3.3V and duty cycle >65% (i.e., VIN >5V for 3.3V output). It improves high-duty-cycle efficiency by reducing BST capacitor discharge losses - particularly valuable in 12V-to-5V or 12V-to-3.3V conversions.
How does the AAM pin affect light-load efficiency and stability?
The AAM pin sets the load threshold at which the device transitions from forced CCM to AAM mode. Lower AAM voltage (e.g., 0.3V) improves ripple and stability but reduces light-load efficiency; higher voltage (e.g., 0.6V) boosts efficiency at sub-200mA loads but may increase output ripple and degrade transient response - values are selected via resistor divider from VCC.
What is the purpose of the frequency fold-back feature triggered by low FB voltage?
When FB falls below 400mV - indicating severe overload or output short - the oscillator frequency folds back to ~25% of nominal (e.g., 125kHz for 500kHz part) to limit peak inductor current and prevent thermal runaway. This complements hiccup-mode OCP by reducing switching loss during fault conditions before full shutdown.
Is MP1494DJ-LF-P RoHS-compliant and lead-free?
Yes - MP1494DJ-LF-P is RoHS-compliant and fully lead-free, with "LF" in the part number denoting lead-free packaging. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified per AEC-Q200 for stress testing, though not officially automotive-qualified.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
MPS recommends MP1476 as a drop-in upgrade offering higher 2.5A current, improved 75mΩ/35mΩ RDS(on), and enhanced thermal performance - while retaining pin compatibility and identical TSOT-23-8 footprint. MP1494DJ-LF-P remains fully supported for existing designs and legacy production, with no announced obsolescence.
MP1494DJ-LF-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:
- Not For New Designs
- 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):
- 13V
- 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
MP1494DJ-LF-P FAQ
1.How can I place an order for MP1494DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1494DJ-LF-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 MP1494DJ-LF-P reliable?
The price and inventory of MP1494DJ-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1494DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP1494DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1494DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1494DJ-LF-P?
MP1494DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1494DJ-LF-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 MP1494DJ-LF-P?
For technical support, including MP1494DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1494DJ-LF-P requirements.
6.How does Aetrix verify that MP1494DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1494DJ-LF-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 MP1494DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP1494DJ-LF-P?
All MP1494DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1494DJ-LF-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 MP1494DJ-LF-P part is unused and in its original packaging.
Return procedure for MP1494DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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