SY8208BQNC Datasheet – Synchronous Step Down Regulator

Part Number: SY8208BQNC

Function: Synchronous Step Down Regulator

Package: QFN3x3-10

Manufacturer: Silergy

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Description

The SY8208BQNC is a high-efficiency synchronous step-down (buck) regulator from Silergy, designed for compact DC-DC conversion with a wide input range of 4V to 28V. It integrates low RDS(ON) MOSFETs, fast transient response control, and a fixed 800kHz switching frequency for optimized performance. This device is widely used in distributed power systems, embedded platforms, and point-of-load regulation applications.

Features

• Wide input voltage range V_IN = 4~28V
• Low R_DS(ON) internal MOSFETs (20mΩ / 10mΩ)
• High efficiency synchronous buck topology
• Instant PWM architecture for fast transient response
• Internal soft-start (~400µs) to limit inrush current
• Pseudo-constant switching frequency of 800kHz
• Compact package suitable for space-constrained designs

Pinout

Design Notes

• Select inductor value based on load current and switching frequency (typically 10µH~22µH)
• Use low-ESR ceramic capacitors for input and output filtering
• Keep high-current paths short and wide to reduce conduction losses
• Ensure proper layout of feedback loop to avoid instability
• Thermal vias under the IC improve heat dissipation

How to Choose This Part

• Select when high efficiency and compact synchronous design are required
• Suitable for wide input voltage applications up to 28V
• Ideal for fast transient load conditions
• Consider switching frequency impact on EMI and efficiency
• Verify output current requirements against thermal limits

Applications

• DC-DC buck converters
• Embedded system power supplies
• Industrial electronics
• Consumer electronics
• Automotive power systems

Alternative / Equivalent Products

• MP1584EN
• LM2596S
• RT8250
• TPS5430
• XL4015

SY8208BQNC Datasheet

Reference Datasheet : SY8208AQNC Datasheet

The SY8208A develops a high efficiency synchronous step-down DC-DC regulator capable of delivering 8A continuous, 16A peak current. The SY8208A operates over a wide input voltage range from 4V to 28V and integrates main switch and synchronous switch with very low R DS(ON) to minimize the conduction loss. The SY8208A adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 800kHz under continuous conduction mode to minimize the size of inductor and capacitor.