FAN53600: 3 MHz, 600 mA / 1A Synchronous Buck Regulator

The FAN53600/10 is a 3 MHz step-down switching voltage regulator, available in 600 mA or 1 A options, that delivers a fixed output from an input voltage supply of 2.3 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN53600/10 is capable of delivering a peak efficiency of 92%, while maintaining efficiency over 80% at load currents as low as 1 mA.

The regulator operates at a nominal fixed frequency of 3 MHz, which reduces the value of the external components to as low as 1 µH for the output inductor and 4.7 µF for the output capacitor. In addition, the Pulse-Width Modulation (PWM) modulator can be synchronized to an external frequency source.

At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate the device in Power-Save Mode with a typical quiescent current of 26 µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control, operating at 3 MHz. In Shutdown Mode, the supply current drops below 1 µA, reducing power consumption. For applications that require minimum ripple or fixed frequency, PFM Mode can be disabled using the MODE pin.

The FAN53600/10 is available in 6-bump, 0.4 mm pitch, Wafer-Level Chip-Scale Package (WLCSP).

Features

• 600 mA or 1 A Output Current Capability
• 26 µA Typical Quiescent Current
• 3 MHz Fixed-Frequency Operation
• Best-in-Class Load Transient Response
• Best-in-Class Efficiency
• 2.3 V to 5.5 V Input Voltage Range
• 0.8 V to 3.3 V Fixed Output Voltage
• Low Ripple Light-Load PFM Mode
• Forced PWM and External Clock Synchronization
• Internal Soft-Start
• Input Under-Voltage Lockout (UVLO)
• Thermal Shutdown and Overload Protection
• Optional Output Discharge
• 6-Bump WLCSP, 0.4 mm Pitch