SY8208A – Synchronous Step Down Regulator

Part Number : SY8208A

Function : Synchronous Step Down Regulator

Manufactures : Silergy

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SY8208A image

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Description :

昱灿电子 Application Notes: AN_SY8208A High Efficiency Fast Response 8A Continuous, 16A Peak, 28V Input Synchronous Step Down Regulator General Description 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 RDS(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. Ordering Information SY8208 □(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type Note SY8208AQNC QFN3x3-10 — Typical Applications Features • Low RDS(ON) for internal switches (top/bottom): 20/10 mΩ • Wide input voltage range: 4-28V • Instant PWM architecture to achieve fast transient responses • Internal 400uS softstart limits the inrush current • Pseudo-constant frequency: 800kHz. • 8A continuous/16A peak output current capability • ±1.5% 0.6V reference • Programmable peak current limit • Power good indicator • Output discharge function • Short circuit latch off protection • Over voltage latch off protection • Input UVLO • Over temperature protection • RoHS Compliant and Halogen Free • Compact package: QFN3x3-10 Applications • LCD-TV/Net-TV/3DTV • Set Top Box • Notebook • High Power AP VIN CIN 10uF High/Floating/Low ON/OFF CVCC 2.2uF IN GND ILMT EN VCC PG BS LX FB PG (Open Drain Output) CBS 100nF L 1.5uH C1 220pF VOUT=3.3V R1 100k COUT 22uF×3 R2 22.1k Figure 1 Schematic Figure 2. Efficiency AN_SY8208A 1 Pinout (top view) 昱灿电子 AN_SY8208A (QFN3x3-10) Top Mark: MRxyz, (Device code: MR, x=year code, y=week code, z= lot number code) Pin Name EN PG ILMT FB VCC BS IN GND LX Pin Number 1 2 3 4 5 6 7,8 9 10 Pin Description Enable control. Pull this pin high to turn on the IC. Do not leave this pin floating. Power good Indicator. Open drain output when the output voltage is within 90% to 120% of regulation point. Current limit setting pin. The current limit is set to 8A, 12A or 16A when this pin is pull low, floating or pull high respectively. Output Feedback Pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: Vout=0.6*(1+R1/R2) Internal 3.3V LDO output. Power supply for internal analog circuits and driving circuit. Bypass a capacitor to GND. Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF ceramic cap. Input pin. Decouple this pin to GND pin with at least 10uF ceramic cap Ground pin Inductor pin. Connect th […]

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SY8208A Datasheet

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