DC-DC

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Battery

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12 V

3.3 V

1.2 V

1.8 V

LDO Output

DC-DC Output

TPS54122-Q1

3.3 V

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Design

TPS54122-Q1

SBVS253A – JANUARY 2015 – REVISED MAY 2015

TPS54122-Q1 Dual-Output, 3-A, QuietSupply™

with Integrated DC-DC Converter and Low-Noise LDO

1 Features

3 Description

The TPS54122-Q1 combines the efficiency of a step-

1

•

AEC-Q100 Qualified with the Following Results:

down switching (dc-dc) converter with a high power-

–

Device Temperature Grade 1: –40°C to 125°C

supply

rejection

(PSR),

low-noise,

low-dropout

Ambient Operating Temperature Range

regulator (LDO) to provide an ultralow-noise power

–

Device HBM ESD Classification Level H2

supply that delivers QuietSupply rails to noise-

sensitive applications.

–

Device CDM ESD Classification Level C4B

The TPS54122-Q1 is ideally suited for systems with

•

Input Voltage Range:

5-V power busses and can support 3-A continuous

–

VIN: 2.95 V to 6.0 V

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

–

BIAS: 2.375 V to 5.5 V

and the dc-dc can be adjusted from 0.83 V to 5.0 V

using external resistors. The TPS54122-Q1 can be

•

Provides Two Configurable Supply Rails

used in a wide range of low-noise applications

•

Independent Enable, Power Good, and Soft-Start

because the dc-dc converter and LDO are completely

•

3-A, High-Efficiency, Synchronous, Step-Down

configurable. In addition, the TPS54122-Q1 includes

Switcher:

features such as soft-start, switching frequency

synchronization, and a power-good signal.

–

Output Voltage Adjustable Down to 0.8 V

The TPS54122-Q1 can also be configured as a dual-

–

Sync to External Clock: 300 kHz to 2 MHz

supply rail device, supplying a total of 3 A.

–

1% Reference Accuracy

The TPS54122-Q1 is available in a space-saving,

•

3-A, Low-Noise LDO:

3.5-mm × 5.5-mm VQFN package, and is specified to

–

operate over a –40°C to 125°C ambient temperature

with DC-DC Running

range. The TPS54122-Q1 is suited for automotive

–

Output Voltage Range: 0.8 V to 3.6 V

applications because the device is qualified for AEC-

Q100 grade 1.

–

Ultralow Dropout: 100 mV (typ) at 3 A

–

1% Output Accuracy

Device Information(1)

–

Excellent Load and Line Transient Response

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Small Package: 5.5-mm × 3.5-mm VQFN-24

TPS54122-Q1

VQFN (24)

5.50 mm × 3.50 mm

(1) For all available packages, see the orderable addendum at

2 Applications

the end of the datasheet.

•

Power Optimization in Automotive ECU Power

•

Automotive Infotainment Systems

•

Automotive ADAS Systems

•

Powering Sensitive Clocking-Distribution Circuits

•

Powering RF Components:

VCOs, Receivers, and ADCs

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.