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The RTQ2551A is a very low dropout linear regulator that operates from an input voltage as low as 0.8V. The device is capable of supplying 1A of output current with a typical dropout voltage of only 50mV. 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 RTQ2551A is stable with an 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 RTQ2551A is available in the WDFN-10L 3x3 package.The recommended junction temperature range is -40°C to 125°C.

Applications

  • PCs, Servers, Modems, and Set-Top Boxes
  • FPGA Applications
  • DSP Core and I/O Voltages
  • Instrumentation
  • Post-Regulation Applications
  • Applications With Sequencing Requirements
Key Spec.
RTQ2551A
Status Active
Vin (min) (V) 0.8
Vin (max) (V) 5.5
Vout (min) (V) 0.8
Vout (max) (V) 3.6
Output Adj. Method Resistor
Accuracy (+/- %) 2
Iout (max) (mA) 1000
Vdropout @ rated current (typ) (mV) 50 @ 1A
Bias Rail Yes
Cout Type Ceramic
Charge Pump No
Features Enable Input;Low Dropout;OCP;Power Good;Stable with Ceramic Capacitor
Package Type WDFN3x3-10
Features
  • 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
  • Low Dropout: 50mV Typical at 1A, VBIAS = 5V
  • 1% Accuracy Over Line/Load/ Temperature
  • Power-Good Indicator for Easy Sequence Control
  • Programmable Soft-Start Provides Linear Voltage Startup
  • Stable with Any Output Capacitor ≥ 2.2μF
  • Overcurrent and Over-Temperature Protection
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RTQ2551AGQW(2)WDFN3x3-101,500 Request Digikey 1,500 Buy
Mouser 0 Lead-Time: 14 weeks
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