The TPS54A20RNJR 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 TPS54A20RNJR 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.
Feature
- 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
- 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
