The RTQ2522A/B is a very low dropout linear regulator which operates from input voltage as low as 0.8V. The device is capable of supplying 2A of output current with a typical dropout voltage of only 90mV. A VBIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the VIN supply for high efficiency regulation. User-programmable soft-start limits the input inrush current and minimizes stress on the input power. The enable input and power good output allow easy sequencing with external regulators. This complete flexibility provides an easy-to-use robust power management solution for a wide variety of applications.
The RTQ2522A/B is stable with output capacitor greater than or equal to 2.2μF. A precise reference and error amplifier deliver 1% accuracy over load, line and temperature. Overcurrent limit and over-temperature protection are also included. The RTQ2522A/B is available in the WDFN-10L 3x3 and WQFN-20L 5x5 packages. The recommended ambient temperature range is -40°C to 105°C and junction temperature range is -40°C to 125°C.


  • PCs, Servers, Modems, and Set-Top-Boxes
  • FPGA Applications
  • DSP Core and I/O Voltages
  • Instrumentation
  • Post-Regulation Applications
  • Applications With Sequencing Requirements
RTQ2522A RTQ2522B
Status Active Active
Vin (min) (V) 0.8 0.8
Vin (max) (V) 5.5 5.5
Vout (min) (V) 0.8 0.8
Vout (max) (V) 3.6 3.6
Output Adj. Method Resistor Resistor
Accuracy (+/- %) 2 2
Iout (max) (mA) 2000 2000
Iq (typ) (uA) 1000 1000
Vdropout @ rated current (typ) (mV) 90 @ 2A 90 @ 2A
Bias Rail Yes Yes
Cout Type Ceramic Ceramic
Charge Pump No No
Features Adjustable Soft-Start;Industrial;Low Dropout;OCP;Power Good;Stable with Ceramic Capacitor Adjustable Soft-Start;Industrial;Low Dropout;OCP;Power Good;Stable with Ceramic Capacitor
Package Type WDFN3x3-10 WQFN5x5-20
  • Ultra low VIN Range: 0.8V to 5.5V
  • VBIAS Voltage Range: 2.7V to 5.5V
  • VOUT Voltage Range: 0.8V to 3.6V
  • 100mA Output Current
  • Low Dropout: 90mV Typical at 2A, VBIAS = 5V
  • 1% Accuracy Over Line/Load/Temperature
  • PGOOD Indicator for Easy Sequence Control
  • Programmable Soft-Start Provides Linear Voltage Startup
  • Stable with Any Output Capacitor ≥ 2.2μF
  • Overcurrent and Over-Temperature Protection
TitleLast UpdateDownload
2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start2023/08/11
Technical Documents
TitleItem TypeLast UpdateDownload
立锜全系列产品选择指南 [Jan., 2024] Selection Guide2024/01/19
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RTQ2522AGQW(2)WDFN3x3-101500 Request Buy from Distributor
RTQ2522BGQW(2)WQFN5x5-201500 Request Buy from Distributor