Texas Instruments TPS54A20 SWIFT Step-Down Converter is a two-phase, synchronous series capacitor buck converter designed for small size, low voltage applications from a 12V input rail. This topology uniquely merges a switched capacitor circuit with a two-phase buck converter. Advantages include automatic current balancing between the inductors, lower switching losses which enable high frequency (HF) operation, and voltage step-down through the series capacitor. Small, low-profile inductors used with the Texas Instruments TPS54A20 significantly reduce total solution area and height. An adaptive on-time control architecture provides fast transient response and accurate voltage regulation at up to 10MHz operating frequency. Fixed frequency operation during the steady-state is maintained using a phase lock loop (PLL) to lock switching signals to a reference oscillator.
Features
Two-phase, synchronous series capacitor buck converter
Automatic current balancing between phases
2MHz to 5MHz per phase switching frequency
14ns minimum on-time
0.51V to 2V output voltage range with ±0.5% feedback reference voltage
Input overvoltage lockout for 17V surge protection
Adjustable current limit with auto-restart (hiccup)
Synchronizes to an external clock
Fixed frequency in steady-state
Adaptive on-time control
Internal feedback loop compensation
Internal gate drive LDO with external supply option
EN pin allowing for adjustable input UVLO
Selectable soft-start time
Monotonic startup with pre-biased output
Output Power Good indicator (open-drain)
Output overvoltage/undervoltage protection
Applications
Telecom, base station, and communications equipment
