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

Monolithic Power Systems Inc. MP1492DS-LF-P

Name: MP1492DS-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP1492DS-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP1492DS-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MP1492DS-LF-P.pdf

Description:: IC REG BUCK ADJ 2A 8SOIC

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Product details

Overview

MP1492DS-LF-P from Monolithic Power Systems is a fully integrated 2A synchronous step-down DC/DC converter with adaptive constant-on-time (COT) control, operating from 4.2V to 16V input and delivering adjustable output from 0.805V to 13V. It features internal 120mΩ high-side and 70mΩ low-side MOSFETs, programmable switching frequency via external resistor, and comprehensive protection including OCP (3.0A), OVP, UVP, and thermal shutdown. It is used in flat-panel TV power rails requiring fast transient response and compact layout.

For engineers reviewing the MP1492DS-LF-P datasheet, MP1492DS-LF-P pinout, MP1492DS-LF-P application, or MP1492DS-LF-P equivalent, key selection criteria include its SOIC8 package, latch-off over-current protection mode, 1ms soft-start time, and compatibility with low-ESR ceramic or POSCAP output capacitors in space-constrained consumer power systems.

Technical Context

The MP1492DS-LF-P employs adaptive COT control to achieve fast load-transient response without external compensation, using input voltage feed-forward to maintain stable switching frequency across 4.2–16V input range. Its internal power stage integrates matched high-side and low-side MOSFETs with R_DS(on) of 120mΩ and 70mΩ respectively, enabling >90% efficiency at 2A load with minimal external components.

Protection architecture includes cycle-by-cycle current limiting with 50μs OCP hold-off timer, non-latching thermal shutdown at 150°C (25°C hysteresis), and UVLO with 3.1V rising threshold. The FB pin monitors output via resistor divider, while FREQ pin sets switching frequency (typically 500kHz) using an external resistor to VIN.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.2V to 16V - supports wide industrial and consumer supply rails including 5V, 12V, and 15V bus systems.
Output Current	2A continuous - sufficient for powering SoCs, FPGAs, and display logic in digital set-top boxes and monitors.
Feedback Voltage	0.805V ±16mV - enables precise output regulation down to sub-1V core voltages with standard resistor dividers.
Switching Frequency	Programmable up to ~1MHz - allows optimization of LC filter size and EMI performance via external R7 resistor.
Current Limit	3.0A - provides robust short-circuit protection while maintaining margin above 2A rated output.
Soft-Start Time	1ms - ensures controlled inrush current during power-up, reducing stress on input capacitors and upstream supplies.
Thermal Shutdown	150°C with 25°C hysteresis - protects die under sustained overload or poor PCB thermal design without latching.

Pinout & Package

MP1492DS-LF-P is housed in an 8-pin SOIC package with exposed pad (RoHS-compliant, lead-free). Thermal resistance θ_JA = 90°C/W on 4-layer PCB, supporting up to 1.39W continuous dissipation at +25°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Power Input	Accepts 4.2–16V supply; requires local 10µF ceramic decoupling capacitor placed adjacent to pin.
2 GND	System Ground Reference	Return path for output voltage regulation; must be connected to low-impedance ground plane to minimize noise coupling.
3 SW	Switch Node	Drives external inductor; high dv/dt node requiring short, wide traces and multiple vias to ground plane.
4 BST	Bootstrap Supply	Connects to SW via 0.1µF ceramic capacitor to generate floating gate drive for high-side MOSFET.
5 BYP	Internal LDO Output	Provides regulated bias for internal circuitry; requires 1µF X7R/X5R ceramic decoupling capacitor.
6 EN	Enable Control	Active-high logic input (1.05–1.6V threshold); pull to VIN for automatic start-up or drive from microcontroller GPIO.
7 FB	Feedback Input	Senses output voltage via resistor divider; high-impedance node (10–50nA bias current) sensitive to PCB leakage.
8 FREQ	Frequency Set	Resistor-to-VIN sets switching frequency; optional 1nF capacitor reduces jitter in noisy environments.

Key Features

Feature	Design Value
Adaptive COT Control	Eliminates need for external loop compensation and enables stable operation with low-ESR ceramic output capacitors.
Integrated Power MOSFETs	120mΩ HS + 70mΩ LS switches reduce conduction loss and simplify BOM versus controller-only solutions.
Programmable Switching Frequency	Adjustable from ~300kHz to >1MHz via single resistor, balancing efficiency, size, and EMI requirements.
Latch-off OCP Mode	Triggers permanent shutdown on sustained overcurrent or output short, requiring power cycle for recovery.
Comprehensive Protection Suite	Includes OVP (125% VREF), UVP (50% VREF), UVLO (3.1V), and thermal shutdown - no external supervision needed.

Applications

Digital Set-Top Box Power

Flat Panel Monitor Core Rail

Use Scenario: Powers ARM-based media processor and DDR memory subsystem in cable/satellite STB with 12V input bus.

IC Role / Device Role / Timing Role: Primary 1.1V/2A buck regulator delivering tightly regulated core voltage with <100mV transient deviation under 1A step load.

Use Value: Adaptive COT control maintains stability with 22µF X7R ceramic output cap, eliminating electrolytic bulk capacitor and saving board area.

Use Scenario: Generates 3.3V logic rail for timing controller and interface ICs in 24-inch LCD monitor with 12V backplane.

IC Role / Device Role / Timing Role: Secondary buck converter operating in CCM at 500kHz, synchronized to system clock for predictable EMI profile.

Use Value: Integrated MOSFETs and SOIC8 package enable single-layer PCB layout with <15mm² footprint, reducing assembly cost.

Distributed Telecom Power

Industrial Display Controller

Use Scenario: Provides isolated 5V auxiliary supply for FPGA configuration and I/O buffers in remote radio unit (RRU) base station.

IC Role / Device Role / Timing Role: Point-of-load regulator accepting 12V intermediate bus; operates across -40°C to +85°C ambient with derated output.

Use Value: 150°C thermal shutdown and 3.1V UVLO ensure reliable startup and fault containment in unregulated outdoor power environments.

Use Scenario: Supplies 1.8V core voltage to ARM Cortex-M7 MCU in ruggedized HMI panel with 24V DC input.

IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 2A peak current during touchscreen interrupt bursts.

Use Value: 1ms soft-start prevents brownout of MCU during cold boot, while latch-off OCP protects against field-replaceable module faults.

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
MP1476DS-LF-Z	Higher 3A output rating, wider 4.5–28V input, same SOIC8 package and COT control.	Supports higher-power SoCs and longer input transients; requires larger inductor and input cap.	Select when future-proofing for >2A loads or 24V industrial input without redesigning layout.
TPS54202DRCT	2A output, 4.5–18V input, D-CAP3 control, 3mm × 3mm WSON package, lower quiescent current (25µA).	Smaller footprint but requires careful thermal management; lacks latch-off OCP (uses hiccup mode).	Prefer for space-constrained portable designs where ultra-low standby power matters more than fault containment.

Compared with MP1492DS-LF-P, MP1476DS-LF-Z offers higher current headroom and input range at identical pinout, while TPS54202DRCT trades latch-off protection and SOIC8 ease-of-use for miniaturization and lower IQ-making MP1492DS-LF-P optimal for cost-sensitive, thermally stable consumer power rails.

Availability

MP1492DS-LF-P is available at Aetrix Electronics and suitable for digital set-top boxes, flat-panel television power supplies, and distributed telecom systems requiring stable component supply, RoHS compliance, and long-term production continuity.

Supply support for MP1492DS-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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP1492 belongs to MPS's mainstream synchronous buck converter product line, engineered for cost-sensitive consumer and industrial applications demanding high integration, fast transient response, and minimal external component count.

FAQ

What is the recommended input capacitor for MP1492DS-LF-P?

A minimum 10µF X7R or X5R ceramic capacitor placed within 3mm of the IN and GND pins is required. For 2A operation, use ≥22µF total capacitance with RMS current rating >1A. Layout must include wide traces and multiple thermal vias to ground plane to minimize impedance and ESR-related losses.

Can MP1492DS-LF-P operate with only ceramic output capacitors?

Yes - its adaptive COT control and internal ramp generation support stable operation with low-ESR ceramic capacitors. However, an external ramp network (R4/C4) is required per Equation 4 in the datasheet to ensure slope compensation when ESR <12mΩ; omitting it risks subharmonic oscillation under light load.

What is the function of the BYP pin and how should it be decoupled?

The BYP pin delivers a regulated internal LDO output used to bias control circuitry. It must be decoupled with a 1µF X7R or X5R ceramic capacitor placed directly between BYP and GND, with trace length <2mm. Larger values (>2.2µF) may cause startup instability; tantalum or aluminum electrolytics are not recommended.

How does the latch-off OCP mode behave during a short-circuit event?

When output short occurs, MP1492DS-LF-P detects current exceeding 3.0A for >50μs and enters latch-off state: HS-FET disables permanently, LS-FET remains on to sink current, and output collapses. Recovery requires full power cycle - VIN must drop below UVLO threshold (3.1V) and re-ramp to restart soft-start sequence.

Is MP1492DS-LF-P suitable for automotive applications?

No - it is specified for -40°C to +85°C ambient (not junction), lacks AEC-Q200 qualification, and has no built-in watchdog or fault-reporting pins. While it may function in cabin-temperature infotainment modules, MPS explicitly recommends MPQ4420A or MPQ4470 for automotive-grade designs requiring extended temperature and reliability validation.

What is the minimum output voltage achievable with MP1492DS-LF-P?

The minimum regulated output is 0.805V, set by the internal reference voltage (V_FB = 0.805V ±16mV). To achieve this, use R2 = 10kΩ and calculate R1 = R2 × ((V_OUT/V_FB) − 1) = 10kΩ × ((0.805/0.805) − 1) = 0Ω - meaning FB connects directly to output. A small series resistor (<100Ω) is recommended for noise immunity.

Does MP1492DS-LF-P support synchronization to an external clock?

No - it lacks an external sync input. Switching frequency is set solely by the resistor connected between FREQ and VIN. Frequency variation across input voltage and temperature is ±10% typical; for tighter regulation, select R7 based on worst-case VIN and use temperature-stable resistor (±100ppm/°C).

MP1492DS-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MP

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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):: 4.2V

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 0.805V

Voltage - Output (Max):: 13V

Current - Output:: 2A

Frequency - Switching:: 300kHz, 500kHz, 700kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MP1492DS-LF-P FAQ

1.How can I place an order for MP1492DS-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP1492DS-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 MP1492DS-LF-P reliable?

The price and inventory of MP1492DS-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 MP1492DS-LF-P is usually 5 days.

3.What payment methods are accepted for MP1492DS-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1492DS-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP1492DS-LF-P?

MP1492DS-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP1492DS-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 MP1492DS-LF-P?

For technical support, including MP1492DS-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1492DS-LF-P requirements.

6.How does Aetrix verify that MP1492DS-LF-P is sourced from the original manufacturer or authorized distributors?

All MP1492DS-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 MP1492DS-LF-P meets industry standards.

7.What is the process for return or replacement of MP1492DS-LF-P?

All MP1492DS-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1492DS-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 MP1492DS-LF-P part is unused and in its original packaging.

Return procedure for MP1492DS-LF-P:

1.Submit a request within 90 days.

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

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