SY8120B – Synchronous Step Down Regulator

Part Number : SY8120B

Function : Synchronous Step Down Regulator

Manufactures : Silergy

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SY8120B image

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Description :

昱灿电子 Application Note: AN_SY8120B High Efficiency Fast Response, 2A, 18V Input Synchronous Step Down Regulator General Description SY8120B develops high efficiency synchronous stepdown DC-DC converter capable of delivering 2A load current . SY8120B operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. SY8120B 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 under heavy load conditions to minimize the size of inductor and capacitor. Ordering Information SY8120 ( ) Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type Note SY8120BABC SOT23-6 — Features Low RDS(ON) for internal switches (top/bottom):145/135 m 4.5-18V input voltage range 2A load current capability Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current 2% 0.6V reference RoHS Compliant and Halogen Free Compact package: SOT23-6 Applications Set Top Box Portable TV Access Point Router DSL Modem LCD TV Typical Applications Figure 1. Schematic Diagram AN_SY8120B Rev.0.2 Figure 2. Efficiency Figure 1 Pinout (top view) 昱灿电子 AN_SY8120B (SOT23-6) Top Mark: NB , (Device code: NB, ) Pin Name BS GND FB EN IN LX Pin Number 1 2 3 4 5 6 Pin Description Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF ceramic cap. Ground pin 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) Enable control. Pull high to turn on. Do not float. Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap Inductor pin. Connect this pin to the switching node of inductor Absolute Maximum Ratings (Note 1) Supply Input Voltage – 19V LX, EN Voltage VIN + 0.3V FB, BS-LX Voltage – 4V Power Dissipation, PD @ TA = 25°C SOT23-6, — 0.6W Package Thermal Resistance (Note 2) JA 170°C/W JC 130°C/W Junction Temperature Range 125°C Lead Temperature (Soldering, 10 sec.) 260°C Storage Temperature Range — […]

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SY8120B Datasheet

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