FAN48632: 2.5 MHz, 2.0 A Pulsed-Load Synchronous TinyBoost™ Regulator with Bypass Mode for GSM PA Supply

The FAN48632 allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current; this IC provides a compact solution for systems using advanced Li-Ion battery chemistries.

The FAN48632 is a boost regulator designed to provide a minimum output voltage (VOUT(MIN)) from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 1.5 A continuous and 2.0 A pulsed. Quiescent current in Shutdown Mode is less than 3 µA, which maximizes battery life. The regulator transitions smoothly between Bypass and normal Boost Mode. The device can be forced into Bypass Mode to reduce quiescent current.

The FAN48632 is available in a 16-bump, 0.4 mm pitch, Wafer-Level Chip-Scale Package (WLCSP).

Features

• Few External Components: 0.47 µH Inductor and 0603 Case Size Input and Output Capacitors
• Input Voltage Range: 2.35 V to 5.5 V
• Fixed Output Voltage : 3.3 V, 3.5 V
• Maximum Continuous Load Current of: 1.5 A at V_IN of 2.6 V
• Maximum Pulsed Load Current: of 2.0 A for GSM 217 Hz repetition rate, boosting V_OUT to 3.3 V or 3.5 V
• Up to 96% Efficient
• True Bypass Operation when V_IN > Target V_OUT
• Internal Synchronous Rectifier
• Soft-Start with True Load Disconnect
• Forced Bypass Mode
• V_SEL Control to Optimize Target V_OUT
• Short-Circuit Protection
• Low Operating Quiescent Current
• 16-Bump, 0.4 mm Pitch WLCSP