SY8089 – Synchronous Step Down Regulator

Part Number : SY8089

Function : Synchronous Step Down Regulator

Manufactures : Silergy

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SY8089 image

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Description :

Application Note: AN_SY8089/SY8089A High Efficiency 5.5V, 2A continuous, 3A peak, 1MHz Synchronous Step Down Regulator General Description The SY8089 and SY8089A are high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A output current. The SY8089 and SY8089A operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency. SY8089 integrates short circuit and over-voltage latch off protection. Ordering Information SY8089 □(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type SY8089AAC SOT23-5 SY8089AAAC SOT23-5 Note Features • Low RDS(ON) for internal switches (top/bottom):110mΩ/80mΩ • 2.7-5.5V input voltage range • 2A continuous, 3A peak load current capability • 1MHz switching frequency minimizes the external components • Internal softstart limits the inrush current • Reliable short circuit protection: SY8089: Latch off protection SY8089A: Hic-cup mode protection • Reliable over-voltage protection: SY8089: Latch off protection SY8089A: No latch off protection • 100% dropout operation • RoHS Compliant and Halogen Free • Compact package: SOT23-5 Applications • LCD TV • Set Top Box • Net PC • Mini-Notebook PC • Access Point Router Typical Applications EfficiencyChipSP(%) VIN: 2.7-5.5V 4 IN 3 L1:2.2µH LX VOUT: 1.8V ON/ OFF CIN 22µF 1 FB 5 EN GND 2 R1 200k C1 COUT 22pF 22µFх2 R2 100k Figure 1.Schematic diagram Figure 2. Efficiency vs Load Current AN_SY8089/A Rev. 0.9A Silergy Corp. Confidential- Prepared for Customer Use Only 1 Pinout (top view) SY8089/8089A Pin Name EN GND LX IN FB SOT23-5 Part Number Package type Top Mark① SY8089AAC SOT23-5 JXxyz SY8089AAAC SOT23-5 KVxyz Note① : x=year code, y=week code, z= lot number code Pin Number 1 2 3 4 5 Pin Description Enable control. Pull high to turn on. Do not float. Ground pin. Inductor pin. Connect this pin to the switching node of inductor. Input pin. Decouple this pin to GND pin with at least 10µF ceramic cap. 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). Absolute Maximum Ratings (Note 1) Supply Input Voltage ———————————————————————————————– -0.3V to 6.0V Enable, FB Voltage—————————————————————————————— -0.3V to VIN + 0.6V Power Dissipation, PD @ TA = 25°C, SOT23-5 ————————————————————————————————————– 0.6W Package Thermal Resistance (Note 2) θ JA ——- […]

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SY8089 Datasheet

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