Monolithic Power Systems Inc. MP1498DJ-LF-P

Overview

MP1498DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC-DC converter with integrated 100mΩ/40mΩ MOSFETs, delivering up to 2A continuous output current across a 4.5V–16V input range. It operates at a fixed 1.4MHz switching frequency with external clock synchronization capability (300kHz–3MHz), supports adjustable soft-start via external capacitor, and regulates output voltage down to 0.8V. It is used in compact I/O power supplies for notebook systems.

For engineers reviewing the MP1498DJ-LF-P datasheet, MP1498DJ-LF-P pinout, MP1498DJ-LF-P application, or MP1498DJ-LF-P equivalent, key selection criteria include its TSOT-23-8 package footprint, internal MOSFET R_DS(ON) values, thermal shutdown threshold (150°C), feedback reference voltage (800mV), and EN/SYNC dual-function pin behavior under 5μs turn-off delay.

Technical Context

The MP1498DJ-LF-P employs peak-current-mode control with a fixed-frequency oscillator and cycle-by-cycle over-current protection. Its proprietary switching-loss-reduction technique enables high efficiency across load conditions while maintaining stable loop response through an internally optimized compensation network.

It integrates a 5V LDO regulator (VCC) powered from VIN, a floating high-side driver supplied via BST bootstrap capacitor, and a dedicated SS pin for externally programmable soft-start timing. The EN/SYNC pin serves both enable logic and external clock synchronization, with internal 6.5V Zener clamping and 5μs turn-off delay.

Key Specifications

Pinout & Package

MP1498DJ-LF-P is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND), optimized for space-constrained PCB layouts and moderate power dissipation (θ_JA = 100°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MP1498DJ-LF-P, MP2332H offers higher current and frequency for next-gen compact designs, while RT7297B provides a lower-cost alternative without sync capability-making MP1498DJ-LF-P optimal for legacy-compatible 1.4MHz-synchronized, thermally constrained 2A applications.

Availability

MP1498DJ-LF-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC rails, flat-panel monitor subsystems, and distributed point-of-load converters requiring stable component supply and long-term industrial availability.

Supply support for MP1498DJ-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 MP1498 belongs to MPS's high-frequency synchronous buck converter product line, engineered for space-constrained, efficiency-critical applications in computing, consumer, and industrial power systems where minimal external components and robust protection are essential.

FAQ

What is the maximum recommended output current for continuous operation?

The MP1498DJ-LF-P is rated for 2A continuous output current under specified thermal conditions (TA ≤ +85°C, θJA = 100°C/W, 2-layer PCB). Derating is required above 85°C ambient or with inadequate copper pour; at 125°C junction temperature, maximum sustainable current drops to approximately 1.3A based on thermal calculations using PD(MAX) = (TJ(MAX) − TA)/θJA.

Can the MP1498DJ-LF-P operate with a 3.3V input supply?

No. The MP1498DJ-LF-P has a minimum input voltage of 4.5V per its absolute maximum ratings and recommended operating conditions. Attempting operation below 4.5V will trigger under-voltage lockout (INUV threshold ~3.9V), preventing startup. For 3.3V-input applications, consider the MP2332H or MP1584EN, which support lower VIN ranges.

How is the feedback reference voltage tolerance specified across temperature?

The feedback reference voltage is 800mV with ±2% initial tolerance at 25°C, and ±2.5% total variation over −40°C to +85°C (780mV to 820mV), as confirmed in the Electrical Characteristics table. This ensures stable output regulation across industrial temperature ranges without requiring external trimming.

Does the EN/SYNC pin require a pull-up resistor for reliable enable functionality?

Yes - while the EN pin has an internal 1MΩ pull-down, a pull-up resistor to VIN (≥55kΩ for 12V input) is recommended to ensure fast, deterministic turn-on and to limit input current into the internal 6.5V Zener clamp. Direct connection to a voltage source >6.5V without current limiting risks damaging the EN pin protection structure.

What is the purpose of the BST pin, and what capacitor value is recommended?

The BST pin supplies the floating gate drive voltage for the high-side MOSFET via a bootstrap capacitor connected between BST and SW. A 0.1µF ceramic capacitor (X5R/X7R, 10V rating) is recommended and must be placed adjacent to the IC with short, low-inductance traces to maintain gate drive integrity and prevent shoot-through during switching transitions.

Is the MP1498DJ-LF-P RoHS compliant and lead-free?

Yes. The "-LF" suffix in MP1498DJ-LF-P explicitly denotes lead-free and RoHS-compliant packaging per EU Directive 2011/65/EU. All MPS products meet JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and are qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?

This notice indicates that MPS has introduced a functional successor - the MP2332H - with enhanced specifications (3A output, 2.2MHz, lower IQ, QFN-12 package). While MP1498DJ-LF-P remains fully supported and available, new designs should evaluate MP2332H for improved performance and long-term roadmap alignment.