TPS54122-Q1 Automotive-grade 3A QuietSupply™ Regulator with Integrated DC-DC Converter and Low-Noise LDO | TI.com

TPS54122-Q1
This product continues to be in production to support existing customers.
Automotive-grade 3A QuietSupply™ Regulator with Integrated DC-DC Converter and Low-Noise LDO

 

This product is not recommended for new designs.

Replaced By TPS54388-Q1 – The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. The TPS54388-Q1 is a standalone automotive-qualified 6V, 3A step-down converter that can be used with the automotive-qualified TPS7A53-Q1 LDO to create a low-noise 3A output

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers.

Description

The TPS54122-Q1 combines the efficiency of a step-down switching (dc-dc) converter with a high power-supply rejection (PSR), low-noise, low-dropout regulator (LDO) to provide an ultralow-noise power supply that delivers QuietSupply rails to noise-sensitive applications.

The TPS54122-Q1 is ideally suited for systems with 5-V power busses and can support 3-A continuous output current on both the dc-dc or LDO output. The LDO output voltage can be set from 0.8 V to 3.6 V and the dc-dc can be adjusted from 0.83 V to 5.0 V using external resistors. The TPS54122-Q1 can be used in a wide range of low-noise applications because the dc-dc converter and LDO are completely configurable. In addition, the TPS54122-Q1 includes features such as soft-start, switching frequency synchronization, and a power-good signal.

The TPS54122-Q1 can also be configured as a dual-supply rail device, supplying a total of 3 A.

The TPS54122-Q1 is available in a space-saving, 3.5-mm × 5.5-mm VQFN package, and is specified to operate over a –40°C to 125°C ambient temperature range. The TPS54122-Q1 is suited for automotive applications because the device is qualified for AEC-Q100 grade 1.

Features

  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C4B
  • Input Voltage Range:
    • VIN: 2.95 V to 6.0 V
    • LDOIN: VOUT + VDO to 5.5 V
    • BIAS: 2.375 V to 5.5 V
  • Provides Two Configurable Supply Rails
  • Independent Enable, Power Good, and Soft-Start
  • 3-A, High-Efficiency, Synchronous, Step-Down Switcher:
    • Output Voltage Adjustable Down to 0.8 V
    • Sync to External Clock: 300 kHz to 2 MHz
    • 1% Reference Accuracy
  • 3-A, Low-Noise LDO:
    • Output Noise: 17 µVRMS at 10 Hz to 1 MHz with DC-DC Running
    • Output Voltage Range: 0.8 V to 3.6 V
    • Ultralow Dropout: 100 mV (typ) at 3 A
    • 1% Output Accuracy
    • Excellent Load and Line Transient Response
  • Small Package: 5.5-mm × 3.5-mm VQFN-24