FAN5358 Datasheet | Fairchild Semiconductor

- 2MHz, 500m A, SC70 Synchronous Buck Regulator September 2009 FAN5358 2MHz, 500m A, SC70 Synchronous Buck Regulator Features - - - - - - - - - - 2MHz Nominal-Frequency Operation 25µA Typical Quiescent Current 500m A 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 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 500m A and maintaining a very high efficiency of over 80% at load currents as low as 1m A. The regulator operates at a nominal frequency of 2MHz, which reduces the value of the external ponents to as low as 2.2μH 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. Applications - - - Cell Phones, Smart Phones 3G, 4G, Wi Fi , Wi MAX™, and Wi Bro Data Cards Netbooks , Ultra-Mobile PCs ® ® ® .. Typical Application L1 Table 1. External ponents for Figure 1 SW GND VOUT 1 2 3 6 5 4 VIN GND EN CIN U1 FAN5358 f SW 2MHz L1 2.2μH 2.2μF COUT 4.7μF U1...