Texas Instruments' TPS54A20 is a two-phase, synchronous series capacitor buck converter designed for small-size, low-voltage applications from a 12 V 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 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 10 MHz operating frequency. Fixed frequency operation during steady state is maintained through the use of a phase lock loop (PLL) to lock switching signals to a reference oscillator.
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- Two-phase, synchronous series capacitor buck converter
- Automatic current balancing between phases
- 2 MHz to 5 MHz per phase switching frequency
- 14 ns minimum on-time
- 0.51 V to 2 V output voltage range with ±0.5% feedback reference voltage
- Input overvoltage lockout for 17 V surge protection
- Adjustable current limit with auto-restart (hiccup)
- Synchronizes to an external clock
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- 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
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Texas Instruments' TPS54A20 is a two-phase, synchronous series capacitor buck converter designed for small-size, low-voltage applications from a 12 V 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 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 10 MHz operating frequency. Fixed frequency operation during steady state is maintained through the use of a phase lock loop (PLL) to lock switching signals to a reference oscillator.
