Regulator

SY8208BQNC Datasheet – Synchronous Step Down Regulator

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Part Number: SY8208BQNC

Function: Synchronous Step Down Regulator

Package: QFN3x3-10

Manufacturer: Silergy

Image :

SY8208BQNC Image

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 VIN = 4~28V
  • Low RDS(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

SY8208BQNC 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

SY8208BQNC pdf datasheet

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.

7808 Transistor – 8V, 1.5A, Voltage Regulator ( PDF )

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Part Number: 7808

Function: Three Terminal Positive Voltage Regulator ( 8V )

Pacakge : TO-220 Type

Manufacturer: Inchange Semiconductor

Image

7808 pdf datasheet

Description

The 7808 is a fixed 8V three-terminal positive linear voltage regulator designed for stable DC power supply applications, commonly packaged in TO-220. It provides reliable voltage regulation with built-in protection features and consistent output performance across varying conditions. This regulator is widely used in power supplies, embedded systems, and analog circuits requiring a steady 8V rail.

Features

  • Fixed output voltage of 8V
  • Output current capability exceeding 1.5A
  • Internal thermal overload protection
  • Output transition safe-area compensation
  • Short-circuit current limiting protection
  • Low lot-to-lot variation for consistent performance

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Input Voltage VIN 35 V
Output Current IO 1.5 A
Power Dissipation Ptot Internally Limited –
Junction Temperature Tj 150 °C
Storage Temperature Tstg -65 to 150 °C

Pinout

7808 pdf pinout

Design Notes

  • Maintain input voltage at least 2V higher than output (dropout consideration)
  • Use input and output capacitors (e.g., 0.33µF and 0.1µF) for stability
  • Heat sinking is required for high current or high input-output voltage differential
  • Thermal shutdown protects the device under overload conditions
  • Ensure proper PCB layout to minimize noise and improve regulation

Typical Circuit Usage

  • Linear regulated power supply stages
  • Microcontroller and logic circuit power rails
  • Analog signal conditioning circuits
  • Battery-powered systems requiring regulated 8V output
  • Post-regulation after DC-DC converters

How to Choose This Part

  • Select when a fixed 8V output is required with simple implementation
  • Ideal for low-noise analog applications compared to switching regulators
  • Ensure thermal design is adequate for power dissipation
  • Use when input voltage is within safe operating limits
  • Not suitable for high-efficiency designs due to linear regulation losses

Applications

  • Power adapters and regulated DC supplies
  • Embedded systems and development boards
  • Audio and instrumentation circuits
  • Industrial control systems
  • Consumer electronics power regulation

Alternative / Equivalent Products

  • LM7808 (standard 8V regulator)
  • L7808 (STMicroelectronics equivalent)
  • KA7808 (Fairchild equivalent)
  • UA7808 (Texas Instruments version)
  • LM317 (adjustable voltage regulator alternative)

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7808 PDF Datasheet