loading

The RTQ2540H is a high-current, low-noise , high accuracy, low-dropout linear regulator (LDO) capable of sourcing 4A with extremely low dropout (max. 145mV). 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 RTQ2540H 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 RTQ2540H 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.
RTQ2540H
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) 4000
Iq (typ) (uA) 3000
Vdropout @ rated current (typ) (mV) 70 @ 4A
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: 39dB at 500kHz
  • Excellent Noise Immunity
    ► 7.4μVRMS at 0.8V Output
    ► 13.8μVRMS at 5V Output
  • Ultra-Low Dropout Voltage: 145mV Max. at 4A
  • 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
RTQ2540HN-TAWQFN2.2x2.5-12(FC)1,500 Request Digikey 1,000 Buy
Mouser 0 Lead-Time: 14 weeks
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RTQ2540HN-TA Digikey 0 Lead-Time: 14 weeks
Mouser 0 Lead-Time: 14 weeks
TOP