Datasheet Texas Instruments TPS54120RGYT — 数据表

TPS54120
www.ti.com SBVS180C – JANUARY 2012 – REVISED JUNE 2012 Low-Noise, 1-A Power Supply
with Integrated DC-DC Converter and Low-Dropout Regulator
FEATURES DESCRIPTION The TPS54120 combines the high-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 ultra low-noise power
supply that delivers quiet power rails to noisesensitive applications. 1 Low-Noise Output: 17 ВµVRMS at 100 Hz to
1 MHz
Wide Input Voltage Range: 4.5 V to 17 V
High Efficiency: 72% at 1 A, 12V Input
Excellent Load/Line Transient Response
Synchronizable to External Clock: 200 kHz to
1.2 MHz
Small Package: 3.5 mm Г— 5.5 mm QFN-24 With a wide input range of 4.5 V to 17 V, the
TPS54120 is ideally suited for systems with 12-V
power busses, and supports a 1-A continuous output
current. The output voltage can be set from 0.8 V to
6.0 V using external resistors. The dc-dc converter
and LDO are completely configurable, allowing the
TPS54120 to be used in a wide range of low-noise
applications. In addition, the TPS54120 includes
features such as softstart, switching frequency …