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3A QuietSupply™ Regulator with Integrated DC-DC Converter and Low-Noise LDO


Package | PIN: RHL | 24
Temp: S (-40 to 150)
Carrier: Cut Tape
Qty Price
1-9 $4.43
10-24 $3.99
25-99 $3.72
100-249 $3.34
250-499 $3.12
500-749 $2.71
750-999 $2.35
1000+ $2.30


  • Input Voltage Range:
    • VIN: 2.95 V to 6 V
    • LDOIN: VOUT + VDO to 5.5V
    • BIAS: 2.375 V to 5.5 V
  • Provides an Efficient, Low Noise Supply Rail
  • 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-DCRunning
    • Output Voltage Range: 0.8 V to 3.6 V
    • Ultra-Low Dropout: 100 mV at 3 A (Typical)
    • 1% Output Accuracy
    • Excellent Load and Line Transient Response
  • Small Package: 5.50 mm × 3.50 mm VQFN-24

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Texas Instruments  TPS54122RHLT

The TPS54122 device combines an efficient step-down switching (DC-DC) converter with ahigh power-supply rejection (PSR), low-noise, low-dropout regulator (LDO) to provide anultra-low-noise power supply that delivers a QuietSupply rail to noise-sensitiveapplications.

TPS54122 is ideally suited for systems with 5-V power busses and can support 3-Acontinuous output current through the DC-DC or LDO output. The LDO output voltage can be set from0.8 V to 3.6 V, and the DC-DC can be adjusted from 0.83 V to 5 V using external resistors. Thedevice can be used in a wide range of low-noise applications because the dc-dc converter and LDOare completely configurable. In addition, the TPS54122 includes features such as soft start,switching frequency synchronization, and a power-good signal.

By feeding the output of the DC-DC converter to the input of the LDO, the TPS54122 cansupply efficient, low-noise power at up to 3 A.

The TPS54122 is available in a space-saving,
5.50 mm × 3.50 mm VQFN package, and is specified to operate over a –40°C to +125°C ambienttemperature range.