TPS54122 1A 低ノイズ、3A 電源、統合 DC-DC コンバータと低ドロップアウトレギュレータ付き | TIJ.co.jp

TPS54122
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1A 低ノイズ、3A 電源、統合 DC-DC コンバータと低ドロップアウトレギュレータ付き

 

概要

The TPS54122 device combines an efficient 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 a QuietSupply rail to noise-sensitive applications.

TPS54122 is ideally suited for systems with 5-V power busses and can support 3-A continuous output current through 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 V using external resistors. The device 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 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 can supply 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 ambient temperature range.





特長

  • Input Voltage Range:
    • VIN: 2.95 V to 6 V
    • LDOIN: VOUT + VDO to 5.5 V
    • 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-DC Running
    • 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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機能一覧

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Part number オーダー・オプション 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)
TPS54122 ご注文 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)    
TPS54120 ご注文 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)