®
RT6258B/C
8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
General Description
The RT6258B/C is an advanced constant on-time (ACOT
TM
)
mode synchronous buck converter. The main control loop
of the RT6258B/C using an advanced constant on-time
(ACOT
TM
) mode control which provides a very fast transient
response. The RT6258B operates from 4.5V to 23V input
voltage and the RT6258C operates from 5.1V to 23V.
Features
4.5V to 23V (RT6258B) and 5.1V to 23V (RT6258C)
Input Voltage Range 8A Output Current
ACOT
TM
Mode Performs Fast Transient Response
ACOT
TM
Architecture to Enable All MLCC Output
Capacitor Usage
Fixed 750kHz (RT6258C) and 500kHz (RT6258B)
Switching Frequency
High Efficient Internal Power MOSFET Switch-
20mΩ (High-Side) and 10mΩ (Low-Side)
Ω
Ω
Fixed 3.3V (RT6258B) and 5V (RT6258C) LDOs
Output Supply 100mA
Pre-biased Soft-Start
Cycle-by-Cycle Over-Current Protection
Input Under-Voltage Lockout
Thermal Shutdown Protection
Output Over-/Under-Voltage Protection
Ultrasonic Mode (USM)
Ordering Information
RT6258B/C
Package Type
QUF : UQFN-12HL 3x3 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
B : 3.3V
C : 5.1V
Note :
Richtek products are :
�½
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Applications
�½
Marking Information
RT6258BGQUF
LE= : Product Code
YMDNN : Date Code
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
LE=YM
DNN
RT6258CGQUF
LJ= : Product Code
LJ=YM
DNN
YMDNN : Date Code
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6258B/C-02
October 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
