Step-Down Converter. RT6228B Datasheet


RT6228B Converter. Datasheet pdf. Equivalent


Part Number

RT6228B

Description

23V Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 26 Pages
Datasheet
Download RT6228B Datasheet


RT6228B
®
RT6228A/B/C
8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
General Description
Features
The RT6228A/B/C is an advanced constant on-time
(ACOTTM) mode synchronous buck converter. The main
control loop of the RT6228A/B/C using an advanced
constant on-time (ACOTTM) mode control which provides
4.5V to 23V (RT6228A/B) and 5.1V to 23V (RT6228C)
Input Voltage Range 8A Output Current
ACOTTM Mode Performs Fast Transient Response
ACOTTM Architecture to Enable All MLCC Output
a very fast transient response. The RT6228A/B operates
Capacitor Usage
from 4.5V to 23V input voltage and the RT6228C operates Fixed 750kHz (RT6228C) and 500kHz (RT6228A/B)
from 5.1V to 23V. For the RT6228A, the output voltage
Switching Frequency
can be programmed between 0.6V to 5.1V.
High Efficient Internal Power MOSFET Switch-
20mΩ (High-Side) and 10mΩ (Low-Side)
Ordering Information
Adjustable Output Voltage from 0.6V to 5.1V
RT6228A/B/C
Note :
(RT6228A)
Fixed 3.3V (RT6228C) LDO Output Supplies 100mA
Package Type
QUF : UQFN-12HL 3x3 (FC) (U-Type)
Pre-biased Soft-Start
Cycle-by-Cycle Over-Current Protection
Lead Plating System
G : Green (Halogen Free and Pb Free) Input Under-Voltage Lockout
Output Voltage
A : Adjustable
Thermal Shutdown Protection
Output Over-/Under-Voltage Protection
B : 3.3V
Ultrasonic Mode (USM)
C : 5.1V
300kHz CLK for External Charge Bump
Richtek products are :
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.
Marking Information
RT6228AGQUF
K6= : Product Code
K6=YM
DNN
YMDNN : Date Code
Applications
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
RT6228BGQUF
K4= : Product Code
K4=YM
DNN
YMDNN : Date Code
RT6228CGQUF
K5= : Product Code
K5=YM
DNN
YMDNN : Date Code
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS6228A/B/C-02 September 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6228B
RT6228A/B/C
Pin Configuration
(TOP VIEW)
12 11 10 9 8 7
BOOT 1
LX 2
6 EN
5 VIN
LX 3
4 PGND
RT6228A
12 11 10 9 8 7
BOOT 1
LX 2
LX 3
6 EN
5 VIN
4 PGND
RT6228B
Simplified Application Circuit
12 11 10 9 8 7
BOOT 1
LX 2
LX 3
6 EN
5 VIN
4 PGND
RT6228C
VIN
VCC
VILMT
VEN
RT6228A
PGOOD
VIN
CIN
VCC
CVCC
BOOT
LX
ILMT
REN
EN
FB
PGND
AGND
BYP
RBOOT
CBOOT
L
VPGOOD
CFF
(Optional)
(ROFpFtional)
R1
R2
CBYP RBYP
(Optional)
VBYP
VOUT
COUT
VIN
VCC
VILMT
VEN
RT6228B
PGOOD
RBOOT
BOOT
VIN
CIN
VCC
CVCC
LX
VOUT
CBOOT
L
VPGOOD
ILMT
PGND
REN
EN
AGND
BYP
CBYP RBYP
(Optional)
VBYP
VOUT
COUT
VSYS
D1
D2
D3
D4
C1 C2 C3
VCP
C4
VIN
VEN
VCC
VLDO
CIN
REN
CVCC
CLDO
12 CLK
5 VIN
RT6228C
PGOOD 7
BOOT 1
VPGOOD
RBOOT
CBOOT
6 EN
9 VCC
11 LDO
LX 2, 3
VOUT 10
PGND 4
AGND 8
L
COUT
CBUFF
VOUT
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6228A/B/C-02 September 2018


Features ® RT6228A/B/C 8A, 23V Synchronous Step -Down Converter with 3.3V/5V LDO Gener al Description Features The RT6228A/B /C is an advanced constant on-time (ACO TTM) mode synchronous buck converter. T he main control loop of the RT6228A/B/C using an advanced constant on-time (AC OTTM) mode control which provides  4.5V to 23V (RT6228A/B) and 5.1V to 23V (RT6228C) Input Voltage Range 8A Outpu t Current  ACOTTM Mode Performs Fast Transient Response  ACOTTM Architec ture to Enable All MLCC Output a very fast transient response. The RT6228A/B operates Capacitor Usage from 4.5V to 23V input voltage and the RT6228C oper ates  Fixed 750kHz (RT6228C) and 500 kHz (RT6228A/B) from 5.1V to 23V. For the RT6228A, the output voltage Switch ing Frequency can be programmed betwee n 0.6V to 5.1V.  High Efficient Int ernal Power MOSFET Switch- 20mΩ (High -Side) and 10mΩ (Low-Side) Ordering I nformation  Adjustable Output Volta ge from 0.6V to 5.1V RT6228A/B/C Note : (RT6228A)  Fixed 3.3V (RT6228C) LD.
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