Monolithic Power Systems Inc. MP2562DS-LF

Overview

MP2562DS-LF from Monolithic Power Systems is a non-synchronous step-down DC/DC converter IC with integrated 460mΩ high-side MOSFET, delivering 1A output current across 4.5V–50V input range and adjustable 0.8V–47V output. It operates at up to 4MHz switching frequency with programmable frequency control via external resistor, enabling compact filter design for automotive and industrial power rails.

For engineers reviewing the MP2562DS-LF datasheet, MP2562DS-LF pinout, MP2562DS-LF application, or MP2562DS-LF equivalent, key selection criteria include its 12µA shutdown quiescent current for battery systems, internal soft-start and current limit (1.8A), thermal shutdown (150°C), and stable operation with ceramic output capacitors - all validated in SOIC8 package with exposed-pad thermal path.

Technical Context

The MP2562DS-LF implements peak current-mode control with internal error amplifier (Gm = 60µA/V, gain = 200V/V) and programmable oscillator set by R_FREQ to ground. Its PWM cycle initiates on internal clock edge, and switch conduction terminates when sensed current reaches COMP-set threshold - enabling fast transient response and simplified loop compensation.

It features dedicated bootstrap driver (BST pin) with 5V regulated floating supply, UVLO (3.0V rising / 2.6V falling), and frequency foldback during startup to prevent inductor current runaway. The SOIC8 variant uses pins 1–8 mapped to SW, EN, COMP, FB, GND, FREQ, VIN, and BST - with GND pin (5) and exposed pad (not present in SOIC8) both tied to system ground for thermal and noise integrity.

Key Specifications

Pinout & Package

MP2562DS-LF is packaged in RoHS-compliant SOIC8 (MP2562DS) with standard 1.27mm pitch and no exposed thermal pad. Pin functions are electrically identical to QFN10 but mapped to 8-pin DIP footprint for through-hole or surface-mount compatibility in space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54340BDDAR, MP2562DS-LF offers the smallest solution size at 4MHz, lowest shutdown current (12µA), and simplest BOM for 1A automotive/industrial rails - making it optimal where EMI, board space, and battery life dominate trade-offs.

Availability

MP2562DS-LF is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and battery-powered telematics requiring stable component supply with full RoHS compliance and traceable lot documentation.

Supply support for MP2562DS-LF 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 MP2562 belongs to MPS's high-voltage DC/DC converter product line, engineered for compact, efficient power conversion in automotive, industrial, and telecom infrastructure where wide input range and EMI resilience are critical.

FAQ

What is the maximum recommended input voltage for reliable 4MHz operation?

The MP2562DS-LF supports 50V absolute maximum input, but for stable 4MHz switching, Monolithic Power recommends ≤12V input per Figure 2 in the datasheet. At 24V input, maximum usable frequency drops to 2MHz to avoid minimum on-time limitation (100ns) causing pulse skipping and regulation instability.

Can MP2562DS-LF operate without an external bootstrap diode?

Yes - the MP2562DS-LF integrates a bootstrap regulator that charges the BST capacitor from VIN through an internal PMOS when SW is low. An external bootstrap diode is only required if duty cycle exceeds 90% or if VIN–V_OUT headroom falls below 3V, which is uncommon in typical 12V→3.3V/5V designs.

How does the internal current limit behave under short-circuit conditions?

Under short-circuit, the MP2562DS-LF enters hiccup mode: it limits peak switch current to 1.8A (typ), then shuts down for ~500µs before retrying. This prevents thermal runaway while maintaining safe junction temperature - verified in Figure 6 (Short Circuit Recovery) of the datasheet.

Is the SOIC8 package thermally adequate for 1A continuous operation at 50V input?

At 50V input and 1A output (3.3V), power dissipation is ~47W × (1–3.3/50) ≈ 44W, but actual losses are <1.5W due to high efficiency (>85%). With θ_JA = 96°C/W, junction rise is <144°C - within 150°C limit. Use 2oz copper, 4+ thermal vias under GND pin, and airflow for sustained 1A operation.

Does the FB pin require external filtering for noise immunity?

No - the FB pin has built-in 10pF capacitance and is designed for direct connection to a resistive divider. However, routing the FB trace away from SW and inductor nodes is mandatory; adding a 100pF capacitor from FB to GND is acceptable if layout constraints cause coupling, but not required for standard layouts.

What is the purpose of the FREQ pin's 1.1×10⁵/R_FREQ frequency equation?

The equation f_SW(kHz) = 180,000 / R_FREQ(kΩ) derives from internal oscillator current and comparator thresholds. Using R_FREQ = 18kΩ gives 10kHz × 18 = 180kHz → 4MHz per datasheet Table; this linear relationship allows precise frequency tuning without trimming or calibration.

Can MP2562DS-LF be synchronized to an external clock?

No - the MP2562DS-LF lacks an external sync input. Its oscillator is resistor-programmed only. For synchronization, consider MPS's MPQ4470 (pin-compatible with SYNC pin) or TI's TPS54360, which offer master-slave clock alignment for multi-rail systems.