Diodes Incorporated LSP5526-S8A

Overview

LSP5526-S8A from Diodes Incorporated is a monolithic synchronous buck converter IC integrating 95mΩ high- and low-side MOSFETs, delivering 2A continuous output current across a 4.5V–23V input range. It features fixed 340kHz switching frequency, adjustable 0.925V–18V output voltage via external resistor divider, cycle-by-cycle overcurrent protection, and programmable soft-start-used in FPGA/DSP power supplies and notebook computer core voltage regulation.

For engineers reviewing the LSP5526-S8A datasheet, LSP5526-S8A pinout, LSP5526-S8A application, or LSP5526-S8A equivalent, key selection criteria include input voltage range compatibility, integrated MOSFET R_DS(on), feedback reference accuracy (0.925V ±25mV), thermal shutdown threshold (160°C), and SOP-8L package suitability for space-constrained DC/DC designs.

Technical Context

This current-mode controlled buck regulator uses internal error amplification (G_EA = 920μA/V, A_VEA = 480 V/V) and transconductance compensation (G_COMP = 3.3 A/V) to achieve fast transient response and stable loop behavior. The 340kHz oscillator sets switching frequency, with short-circuit mode dropping to 120kHz for enhanced fault handling.

It implements input UVLO (4.05V rising threshold, 100mV hysteresis), EN enable logic (2.5V lockout, 1.4V shutdown), and bootstrap gate drive (BS pin requiring 0.01μF capacitor to SW) to sustain high-side MOSFET conduction. Thermal shutdown activates at 160°C with 25°C hysteresis.

Key Specifications

Pinout & Package

Package: SOP-8L (Surface-Mount Small Outline Package, 8-lead, 1.27mm pitch, 5.0mm × 6.0mm body, 1.65mm max height). Moisture Sensitivity Level 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MP2451DT-LF-Z and TPS54202DRCT, the LSP5526-S8A offers lower cost and proven thermal performance in SOP-8L at 2A, with unique 120kHz foldback during short circuit-critical for protecting downstream loads in unattended embedded systems.

Availability

LSP5526-S8A is available at Aetrix Electronics and suitable for FPGA power supplies, notebook computing subsystems, distributed telecom power, and ASIC I/O bank regulation requiring stable component supply and long-term production continuity.

Supply support for LSP5526-S8A 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The LSP5526 belongs to Diodes' high-density synchronous buck converter product line, designed specifically for compact, cost-sensitive point-of-load applications where integrated MOSFETs, wide input range, and robust protection are essential.

FAQ

What is the minimum output voltage achievable with the LSP5526-S8A?

The LSP5526-S8A has a fixed internal feedback reference of 0.925V. With an external resistor divider on the FB pin, the lowest practical output voltage is 0.925V - achieved by connecting FB directly to the output (R2 = 0Ω, R1 open). Output voltages below 0.925V are not supported due to internal reference architecture and comparator thresholds.

Can the LSP5526-S8A operate without the bootstrap capacitor?

No. The BS pin supplies the gate drive voltage for the high-side MOSFET. Without the required 0.01μF ceramic capacitor between BS and SW, the high-side switch cannot turn on properly, resulting in no output regulation or potential latch-up. This capacitor must be placed with minimal trace length to maintain gate drive integrity.

Does the LSP5526-S8A support forced PWM or power-save mode?

The LSP5526-S8A operates exclusively in forced continuous conduction mode (CCM) at fixed 340kHz. It does not include pulse-skipping or discontinuous conduction mode (DCM) for light-load efficiency optimization. At no load, quiescent current is 1.5mA - typical for CCM controllers prioritizing transient response over ultra-low-I_Q.

What is the maximum allowable output capacitance for stability?

The LSP5526-S8A is stable with ceramic output capacitors ≥22μF and ESR <5mΩ. For higher-ESR tantalum or electrolytic capacitors, stability requires adding C_COMP2 (e.g., 680pF) across R_COMP when ESR × C_OUT ≥ 1/(4πf_SW). No absolute maximum C_OUT limit exists, but excessive capacitance (>100μF ceramic) may slow transient recovery and increase soft-start time.