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The RTQ2538H is a high-current, low-noise, high accuracy, low-dropout linear regulator (LDO) capable of sourcing 2A with extremely low dropout (max. 90mV). The device supports single input supply voltage as low to 1.1V, enhancing its ease of use.

The low-noise, high PSRR and high output current capability makes the RTQ2538H ideal for powering noise-sensitive devices such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. With very high accuracy, remote sensing, and soft-start capabilities to reduce inrush current, the RTQ2538H is suitable for powering digital loads such as FPGAs, DSPs, and ASICs.

The external enable control and power good indicator function make the control sequence easier. The output noise immunity is enhanced by adding external bypass capacitor on the NR/SS pin. The device is fully specified over the temperature range of TJ = -40°C to 125°C and is offered in the WQFN-12L 2.2x2.5 (FC).

Applications

  • Portable Electronic Devices
  • Wireless Infrastructures: SerDes, FPGA, DSP
  • RF, IF, Components: VCO, ADC, DAC, LVDS
Key Spec.
RTQ2538H
Status Active
Vin (min) (V) 1.1
Vin (max) (V) 6.5
Vout (min) (V) 0.8
Vout (max) (V) 5.5
Output Adj. Method Resistor
Accuracy (+/- %) 1
Iout (max) (mA) 2000
Iq (typ) (uA) 2800
Vdropout @ rated current (typ) (mV) 34 @ 2A
Bias Rail No
Cout Type Ceramic
Charge Pump Yes
Features Adjustable Soft-Start;Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Power Good
Package Type WQFN2.2x2.5-12(FC)
Features
  • Input Voltage Range: 1.1V to 6.5V
  • Output Voltage Range: 0.8 V to 5.5V
  • Accurate Output Voltage Accuracy (1%) Over Line, Load and Temperature
  • Ultra-High PSRR: 43dB at 500kHz
  • Excellent Noise Immunity
    ► 7.8μVRMS at 0.8V Output
    ► 12.8μVRMS at 5V Output
  • Ultra-Low Dropout Voltage: 90mV Max. at 2A
  • Enable Control
  • Programmable Soft-Start Output
  • Stable with a 47μF or Larger Ceramic Output Capacitor
  • Supports Power-Good Indicator Function
Technical Documents
TitleItem TypeLast UpdateDownload
RICHTEK Low-Noise LDOs for Industrial Applications App. Note2024/11/18
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RTQ2538HN-TAWQFN2.2x2.5-12(FC)1,500 Request Digikey 1,350 Buy
Mouser 0 Lead-Time: 14 weeks
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RTQ2538HN-TA Digikey 0 Lead-Time: 14 weeks
Mouser 0 Lead-Time: 14 weeks
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