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  Richtek Technology Electronic Components Datasheet  

RT6256C Datasheet

23V Synchronous Step-Down Converter

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®
RT6256B/C
6A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
General Description
The RT6256B/C is an advanced constant on-time (ACOTTM)
mode synchronous buck converter. The main control loop
of the RT6256B/C using an advanced constant on-time
(ACOTTM) mode control which provides a very fast transient
response. The RT6256B operates from 4.5V to 23V input
voltage and RT6256C operates from 5.1V to 23V.
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
Ordering Information
RT6256B/C
Package Type
QUF : UQFN-12HL 3x3 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Output Voltage
B : 3.3V
C : 5.1V
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
RT6256BGQUF
L8= : Product Code
L8=YM
DNN
YMDNN : Date Code
RT6256CGQUF
L9=YM
DNN
L9= : Product Code
YMDNN : Date Code
Features
4.5V to 23V (RT6256B) and 5.1V to 23V (RT6256C)
Input Voltage Range 6A Output Current
ACOTTM Mode Performs Fast Transient Response
ACOTTM Architecture to Enable All MLCC Output
Capacitor Usage
Fixed 750kHz (RT6256C) and 500kHz (RT6256B)
Switching Frequency
High Efficient Internal Power MOSFET Switch-
30mΩ (High-Side) and 15mΩ (Low-Side)
Fixed 3.3V (RT6256B) and 5V (RT6256C) 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)
Pin Configuration
(TOP VIEW)
12 11 10 9 8 7
BOOT 1
LX 2
NC 3
6 EN
5 VIN
4 PGND
RT6256B
12 11 10 9 8 7
BOOT 1
LX 2
NC 3
6 EN
5 VIN
4 PGND
RT6256C
UQFN-12HL 3x3 (FC)
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS6256B/C-01 September 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT6256C Datasheet

23V Synchronous Step-Down Converter

No Preview Available !

RT6256B/C
Typical Application Circuit
VIN
4.5V to 23V
VCC
VEN
VLDO3
3.3V/100mA
CIN
10µF x 2
5 VIN
CVCC
1µF
REN
1K
CLDO3
4.7µF
9 VCC
6 EN
11 LDO3
RT6256B
PGOOD
7
BOOT 1
LX 2
VOUT 10
FF 12
AGND 8
PGND 4
RBOOT
10 CBOOT
0.1µF
L
1µH
RFF 1k
VPGOOD
CFF
10pF
VOUT
3.3V/6A
COUT
22µF x 4
VIN
5.1V to 23V
VCC
VEN
VLDO5
5V/100mA
5 VIN
RT6256C
PGOOD
7
CIN
10µF x 2
BOOT 1 RBOOT
10
CVCC
1µF
11
VCC
LX 2
REN
1K
6 EN
VOUT 10
FF 9
RFF
12 LDO5
CLDO5
4.7µF
AGND 8
PGND 4
1k
VPGOOD
CBOOT
0.1µF
L
1µH
CFF
10pF
CBUFF
0.1µF
COUT
22µF x 4
VOUT
5.1V/6A
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6256B/C-01 September 2018


Part Number RT6256C
Description 23V Synchronous Step-Down Converter
Maker Richtek
Total Page 23 Pages
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