TPS54122-Q1_15 Datasheet, PDF (1/40 Pages) Texas Instruments – TPS54122-Q1 Dual-Output, 3-A, QuietSupply™ with Integrated DC-DC Converter and Low-Noise LDO

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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
•1 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: V_OUT + V_DO 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 µV_RMS 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
2 Applications
• Power Optimization in Automotive ECU Power
• Automotive Infotainment Systems
• Automotive ADAS Systems
• Powering Sensitive Clocking-Distribution Circuits
• Powering RF Components:
VCOs, Receivers, and ADCs
3 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54122-Q1
VQFN (24)
5.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
12 V
3.3 V
DC-DC
TPS54122-Q1
Battery
VIN (DC-DC)
DC-DC Output ^{1.2 V} _VCORE
Microprocessor
LDOIN
LDO Output ^{1.8 V} VCCIO
3.3 V
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.