TPS54A20 Small, 10MHz 10A, 8V to 14V Input, SWIFT Series Capacitor Step-Down Converter | TI.com

TPS54A20 (ACTIVE)

Small, 10MHz 10A, 8V to 14V Input, SWIFT Series Capacitor Step-Down Converter

 

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Description

The 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.

Features

  • 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

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WEBENCH® Designer TPS54A20

  Min   Max Range
Vin  V 8.0 to 14.0V
Vout  V 0.5 to 2V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
TPS54A20 Order now 8     14     0.5     2     10     1     4000     10000     5     Adjustable Current Limit
Enable
Frequency Synchronization
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Constant on-time (COT)     25     -40 to 125     Catalog     VQFN-HR | 20     Converter     20VQFN-HR: 14 mm2: 3.5 x 4 (VQFN-HR | 20)