EVB_RT2855ALGQW: 1.05V @ 4A, 4.5 ~ 18Vin

Summary

The RT2855A is a high-performance 650kHz 4A step-down regulator with internal power switches and synchronous rectifiers. It features quick transient response using its Advanced Constant On-Time (ACOT™) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from 0.765V to 7V.

Product Feature

Discontinuous operating mode at Light Load
Advanced Constant On-Time (ACOT™) Control
Optimized for Ceramic Output Capacitors
Externally-adjustable, Pre-biased Compatible Soft-Start
Optional Output Discharge Function
Output Over- and Under-voltage Shut-down in Latched

Specifications

Manufacturer	Richtek USA Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	EVB_RT2855ALGQW-ND
Eval Board Supplier	Richtek USA Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.05 V
Current Out	4 A
Voltage In	4.5 ~ 18 V
Efficiency @ Conditions	>80%, 5V in, 1.05V @ 0.04 ~ 4 A >70%, 18V in, 1.05V @ 0.6 ~ 4 A >70%, 12V in, 1.05V @ 0.05 ~ 4 A
Voltage Out Range	0.765 ~ 7 V
Features	Current Limit (Adj. or Fixed) Light Load Mode Over Voltage Protection Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	650 kHz
Standby Current [Typical]	1 µA
Quiescent Current [Typical]	1 mA
Component Count + Extras	17 + 5
Internal Switch	Yes
Design Author	Richtek USA Inc.
Application / Target Market	Computers LCD TV / Monitor Point of Load (PoL) Power: Industrial Power White Goods
Standby Current [Maximum]	10 µA
Quiescent Current [Maximum]	1.3 mA
Main I.C. Base Part	RT2855A
Date Created By Author	2015-10
Date Added To Library	2025-06