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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP1494DJ-LF-Z

Name: MP1494DJ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP1494DJ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP1494DJ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-8 Thin, TSOT-23-8

Datasheet:: MP1494DJ-LF-Z.pdf

Description:: IC REG BUCK ADJ 2A TSOT23-8

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Product details

Overview

MP1494DJ-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter 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 output voltage down to 0.8V - deployed in notebook I/O power and flat-panel display power rails.

For engineers reviewing the MP1494DJ-LF-Z datasheet, MP1494DJ-LF-Z pinout, MP1494DJ-LF-Z application, or MP1494DJ-LF-Z equivalent, key selection criteria include AAM-mode light-load efficiency control, internal soft-start timing (1.5ms), thermal shutdown threshold (150°C), and EN/SYNC dual-function pin behavior for enable control or external clock synchronization from 200kHz to 2MHz.

Technical Context

The MP1494DJ-LF-Z employs peak-current-mode control with an internal 0.807V feedback reference and cycle-by-cycle over-current protection triggering at 3A typical. Its error amplifier uses an optimized internal compensation network, eliminating need for external loop compensation components.

It integrates a 5V internal VCC regulator powered from VIN, bootstrap circuitry with BST pin requiring external capacitor between SW and BST, and UVLO with 3.9V rising threshold and 650mV hysteresis - 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 termination, and interface ICs in compact systems.
Switching Frequency	Fixed 500kHz (±12%) - enables small external inductor (e.g., 2.2µH) and reduces EMI filtering burden.
Feedback Reference	0.807V ±20mV - sets output voltage via resistor divider; enables precise 3.3V, 2.5V, 1.8V, or 1.2V regulation.
HS/LS R_DS(on)	100mΩ / 40mΩ - minimizes conduction loss at full load, supporting >90% efficiency at 12V_IN/3.3V_OUT/2A.
Thermal Shutdown	150°C with 20°C hysteresis - protects die during overload or poor PCB thermal design; auto-recovery at ~130°C.
Soft-Start Time	1.5ms - prevents output overshoot and inrush current during power-up without external timing components.

Pinout & Package

MP1494DJ-LF-Z is housed in an 8-pin TSOT-23 package (3.0mm × 3.0mm × 0.9mm), optimized for high-density PCB layouts with exposed thermal pad (pin 4 GND serves as primary thermal path).

Pin/Terminal	Circuit Role	Design Meaning
1 AAM	Advanced Asynchronous Modulation control	Adjusts light-load mode transition point; tie to VCC for forced CCM or to resistor divider for AAM optimization.
2 IN	Main power input	Accepts 4.5V–16V supply; requires local 22µF ceramic decoupling capacitor with low-ESR layout.
3 SW	Power switch node	Drives external inductor; high di/dt node requiring short, wide copper trace and separation from analog signals.
4 GND	System ground reference	Primary thermal and signal return; must connect directly to large ground plane with multiple vias.
5 BST	Bootstrap supply for HS gate driver	Requires 0.1µF ceramic capacitor between BST and SW; 10Ω series resistor recommended to damp ringing.
6 EN/SYNC	Enable and external clock input	Logic-high (>1.25V) enables operation; accepts 200kHz–2MHz external clock for EMI reduction or synchronization.
7 VCC	Bias supply output	Internal 5V regulator output; 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 - keep trace short and shielded.

Key Features

Feature	Design Value
AAM Power-Save Mode	Enables discontinuous conduction mode under light loads to maintain >85% efficiency at 10mA output, reducing standby power.
Synchronous rectification	Integrated 100mΩ/40mΩ MOSFET pair eliminates external Schottky diode, lowering BOM count and thermal footprint.
Internal soft-start	1.5ms ramp time prevents output overshoot and limits inrush current - no external capacitor required.
Hiccup-mode OCP	Enters periodic restart on sustained over-current or short-circuit, limiting average fault current to <100mA and preventing thermal runaway.
Wide sync frequency range	Accepts 200kHz–2MHz external clock on EN/SYNC pin, enabling EMI spread-spectrum or multi-rail synchronization.

Applications

Notebook I/O Power Rail

Digital Set-Top Box Core Supply

Use Scenario: Provides clean 3.3V/2A power to USB controllers, PCIe switches, and SATA PHYs in ultrabook platforms with tight board space.

IC Role / Device Role / Timing Role: Primary buck regulator managing dynamic load transients up to 2A with <5% output deviation under 1A/µs step load.

Use Value: Internal current-mode control and 500kHz switching enable fast transient response and stable regulation without external compensation.

Use Scenario: Generates 1.8V/2A for SoC I/O domains and 2.5V/2A for video DACs in cable/satellite STB designs operating from 12V wall adapter.

IC Role / Device Role / Timing Role: Dual-output capable via resistor-divider reconfiguration; supports multiple voltage domains from single input rail.

Use Value: Adjustable feedback reference (0.807V) and wide input range allow flexible output scaling while maintaining ±1% line/load regulation.

Flat-Panel Monitor Logic Supply

Distributed Telecom Power Node

Use Scenario: Powers FPGA configuration circuitry and LVDS transmitter ICs in 24-inch LCD monitors using 12V system bus.

IC Role / Device Role / Timing Role: Secondary buck stage stepping 12V down to 1.2V/2A for FPGA core and 3.3V/2A for interface logic.

Use Value: TSOT-23-8 package and minimal external component count (only inductor, two capacitors, three resistors) reduce solution size to <80mm².

Use Scenario: Supplies isolated 5V/2A auxiliary power to remote sensor nodes in industrial Ethernet infrastructure with 48V PoE-derived input.

IC Role / Device Role / Timing Role: Intermediate buck stage converting 48V down to 12V, feeding downstream point-of-load regulators.

Use Value: 16V absolute max input rating and robust UVLO (3.9V rise/3.25V fall) ensure reliable start-up even with input ripple on unregulated 48V rails.

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 output current rating, 600kHz switching frequency, improved light-load efficiency via forced PWM mode.	Preferred for new designs requiring >2A or tighter output voltage accuracy (0.8V ±1%).	Select MP1476 if upgrading from MP1494 for higher current headroom or lower output ripple.
RT7272BGJ8F	4.5V–18V input, 2A output, 600kHz, but lacks AAM mode and external sync capability; uses different pinout (EN separate from SYNC).	Suitable where cost sensitivity outweighs flexibility; requires redesign of EN/SYNC and AAM circuitry.	Choose RT7272 only when AAM and sync features are unused and pin compatibility is verified.

Compared with MP1494DJ-LF-Z, MP1476DJ-LF-Z offers higher current and tighter reference tolerance for next-gen designs, while RT7272BGJ8F trades feature richness for lower unit cost - making MP1494 optimal for legacy-compatible, space-constrained 2A applications needing AAM and sync flexibility.

Availability

MP1494DJ-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core supplies, flat-panel monitor logic rails, and distributed telecom power nodes requiring stable component supply across extended product lifecycles.

Supply support for MP1494DJ-LF-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 distribution through authorized partners.

The MP1494 belongs to MPS's mainstream synchronous buck converter product line, engineered for compact, high-efficiency DC/DC conversion in space-constrained consumer and computing applications - emphasizing integration, thermal robustness, and ease of use.

FAQ

What is the maximum recommended output current for MP1494DJ-LF-Z under continuous operation?

The MP1494DJ-LF-Z delivers 2A continuous output current at TA = +25°C with proper PCB thermal design (2-layer board, 1-in² copper pour on GND). Derating applies above 85°C ambient; at 125°C junction, maximum sustainable current drops to ~1.3A due to thermal shutdown activation.

Can MP1494DJ-LF-Z be synchronized to an external clock, and what is the valid frequency range?

Yes - the EN/SYNC pin accepts external clock signals from 200kHz to 2MHz. The internal oscillator synchronizes to the rising edge of the external clock after a 2ms stabilization delay. Pulse width must remain below 1.7µs to avoid mis-triggering.

How does the AAM pin affect light-load efficiency and stability?

AAM voltage sets the load threshold at which the device transitions from AAM (discontinuous mode) to CCM (continuous mode). Lower AAM voltage improves ripple and stability but reduces light-load efficiency; higher AAM improves efficiency but may degrade transient response and increase output ripple.

Is an external bootstrap diode required for reliable operation?

No - the internal bootstrap circuit suffices for most applications. An external diode (e.g., IN4148) is optional and beneficial only when duty cycle exceeds 65% (e.g., 5V_OUT from 12V_IN) to improve high-side gate drive strength and efficiency by ~1–2%.

What is the minimum output voltage achievable with MP1494DJ-LF-Z?

The feedback reference is 0.807V ±20mV, so the practical minimum output voltage is 0.8V. Output voltages below 0.8V are not supported - attempting lower values causes regulation failure due to insufficient COMP voltage headroom in the error amplifier.

Does MP1494DJ-LF-Z support output voltage adjustment during operation?

No - output voltage is set statically by the external resistor divider on the FB pin. There is no digital interface, VID pins, or programmable reference; real-time adjustment requires external DAC-controlled resistor networks, which are not recommended per datasheet guidance.

What PCB layout practices are critical for stable MP1494DJ-LF-Z operation?

Three practices are essential: (1) Place 0.1µF VCC capacitor within 2mm of VCC and GND pins; (2) Use wide, short traces for IN, SW, and GND with direct connection to solid ground plane; (3) Keep FB trace short, away from SW/BST, and route feedback resistors (R1/R2/R9) adjacent to the IC to minimize noise coupling.

MP1494DJ-LF-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:: 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-Z FAQ

1.How can I place an order for MP1494DJ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP1494DJ-LF-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 MP1494DJ-LF-Z reliable?

The price and inventory of MP1494DJ-LF-Z 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-Z is usually 5 days.

3.What payment methods are accepted for MP1494DJ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1494DJ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP1494DJ-LF-Z?

MP1494DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP1494DJ-LF-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 MP1494DJ-LF-Z?

For technical support, including MP1494DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1494DJ-LF-Z requirements.

6.How does Aetrix verify that MP1494DJ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP1494DJ-LF-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 MP1494DJ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP1494DJ-LF-Z?

All MP1494DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1494DJ-LF-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 MP1494DJ-LF-Z part is unused and in its original packaging.

Return procedure for MP1494DJ-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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