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FAN5358 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5358 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 13 page September 2009 © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5358 • Rev. 1.0.1 FAN5358 2MHz, 500mA, SC70 Synchronous Buck Regulator Features 2MHz Nominal-Frequency Operation 25µA Typical Quiescent Current 500mA Output Current Capability 2.7V to 5.5V Input Voltage Range 1.0 to 1.8V Fixed Output Voltages Low Ripple, Light-Load PFM Mode Internal Soft-Start Input Under-Voltage Lockout (UVLO) Thermal Shutdown and Overload Protection 6-lead 2 x 2.2mm SC70 Applications Cell Phones, Smart Phones 3G, 4G, WiFi ®, WiMAX™, and WiBro® Data Cards Netbooks ®, Ultra-Mobile PCs Description The FAN5358 is a step-down switching voltage regulator that delivers a fixed output from an input voltage supply of 2.7V to 5.5V. Using a proprietary architecture with synchronous rectification, the device is capable of delivering 500mA and maintaining a very high efficiency of over 80% at load currents as low as 1mA. The regulator operates at a nominal frequency of 2MHz, which reduces the value of the external components to as low as 2.2 μH for the output inductor and 4.7µF for the output capacitor. At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 25µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. In shutdown mode, the supply current drops below 1µA, reducing power consumption. FAN5358 is available in a 6-lead SC70 package. Typical Application SW EN L1 C IN VOUT C OUT VIN U1 1 2 3 6 5 4 GND GND Figure 1. FAN5358 Typical Application Table 1. External Components for Figure 1 U1 fSW L1 CIN COUT FAN5358 2MHz 2.2 μH 2.2 μF 4.7 μF Wi-Fi® is a registered trademark of Wi-Fi Alliance Corporation. WiMax™ is a trademark of WIMAX Forum Corporation. WiBro® is a registered trademark of Telecommunications Technology Association. Netbooks® is a registered trademark of Netbooks, Inc. |
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