TPS54120 Low-Noise 1A Power Supply with Integrated DC-DC Converter and Low-Dropout Regulator | TI.com

TPS54120
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Low-Noise 1A Power Supply with Integrated DC-DC Converter and Low-Dropout Regulator

 

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 noise-sensitive applications.

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 synchronization, and a power-good signal.

The device is available in a space-saving, 3.5-mm × 5.5-mm QFN package, and is specified to operate over a –40°C to +125°C junction temperature range.

Features

  • Low-Noise Output: 17 µVRMS 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 × 5.5 mm QFN-24

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)
TPS54120 Order now 4.5     17     0.8     6     1     2     500     500     0.04     Enable
Power Good
Synchronous Rectification    
Current Mode     98     -40 to 125     Catalog     VQFN | 24     Converter     24VQFN: 19 mm2: 3.5 x 5.5 (VQFN | 24)    
TPS54122 Order now 2.95     6     0.8     4.5     3     2     300     2000     0.36     Enable
Power Good
Multiple Outputs    
Current Mode     98     -40 to 150     Catalog     VQFN | 24     Converter     24VQFN: 19 mm2: 3.5 x 5.5 (VQFN | 24)