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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.

4558D Datasheet, JRC NJM4558D PDF – Dual OP AMP

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The 4558D (also known as NJM4558D / JRC4558) is a dual operational amplifier consisting of two internally compensated, high-gain op-amps integrated on a single silicon die.

Part Number: JRC4558, NJM4558D

Function: DUAL OPERATIONAL AMPLIFIER

Package: DIP 8 Pin Type

Manufacturer: Japan Radio Corporation

Image

4558D datasheet pdf

Description

The 4558D, NJM4559 integrated circuit is a dual high-gain operational amplifier internally compensated and constructed on a single silicon chip using an advanced epitaxial process.

Combining the features of the NJM741 with the close parameter matching and tracking of a dual device on a monolithic chip results in unique performance characteristics. Excellent channel separation allows the use of the dual device in single NJM741 operational amplifier applications providing density. It is especially well suited for applications in differential-in, differential-out as well as in potentiometric amplifiers and where gain and phase matched channels are mandatory.

Features

  • Wide operating supply range: ±4V to ±18V
  • High open-loop voltage gain (~100 dB typical)
  • High input resistance (~5 MΩ typical)
  • Good channel separation and matching
  • Bipolar input stage (better noise than early general-purpose op-amps)
  • Stable without external compensation
  • Available in standard DIP and SOP packages

Pin Configuration (8-Pin Dual Op-Amp)

4558d datasheet

  • Pin 1: Output 1
  • Pin 2: Inverting Input 1 (-)
  • Pin 3: Non-inverting Input 1 (+)
  • Pin 4: V– (Negative supply or GND)
  • Pin 5: Non-inverting Input 2 (+)
  • Pin 6: Inverting Input 2 (-)
  • Pin 7: Output 2
  • Pin 8: V+ (Positive supply)

Key Electrical Characteristics (Typical)

  • Open-loop gain: ~100 dB
  • Input bias current: ~200 nA
  • Input offset voltage: ~1–5 mV
  • Slew rate: ~1 V/µs
  • Gain-bandwidth product: ~3 MHz

Typical Circuit Usage

  • Audio preamplifiers and tone control circuits
  • Active filters (low-pass, high-pass, band-pass)
  • Signal conditioning and buffering
  • Differential amplifier stages
  • Integrator and comparator (non-critical timing)

How to Choose This Part

  • Use when moderate performance and low cost are priorities
  • Ideal for audio-frequency applications (<100kHz)
  • Suitable when dual op-amp matching is required
  • Not recommended for precision low-offset or rail-to-rail designs
  • Consider modern CMOS op-amps for low-power or high-speed needs

Applications

  • Audio amplifiers and mixers
  • Instrumentation and signal processing
  • Industrial analog control circuits
  • Consumer electronics
  • General-purpose analog design

Alternative / Equivalent Products

  • LM358 (single-supply, lower power alternative)
  • TL072 (JFET input, lower noise for audio)
  • NE5532 (high-performance audio op-amp)
  • OPA2134 (audiophile-grade op-amp)
  • MC1458 (older equivalent dual op-amp)

Other data sheets are available within the file: JRC4558, JRC4559, NJM4558M, NJM4558L, NJM4558V

4558D Datasheet PDF Download

JRC4558 pdf