RT7238E Step-Down Converter Datasheet

RT7238E Datasheet, PDF, Equivalent


Part Number

RT7238E

Description

500kHz Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 24 Pages
Datasheet
Download RT7238E Datasheet


RT7238E
®
RT7238B/C/D/E
8A, 23V, 500kHz Synchronous Step-Down Converter
with 3.3V/5V LDO
General Description
The RT7238B/C/D/E is an advanced constant on-time
(ACOTTM) mode synchronous step-down converter. The
main control loop of RT7238B/C/D/E using an advanced
constant on-time (ACOTTM) mode control which provides
a very fast transient response. The RT7238B/C/D/E
operates from 8V to 23V input voltage. For the RT7238D,
the output voltage can be adjusted between 0.6V to 5V.
Ordering Information
RT7238
Package Type
QUF : UQFN-10L 3x3 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
B : 3.35V
C : 5.1V
D : Adjustable
E : 5V
Note :
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.
Features
Advanced Constant On-Time (ACOT) Control
8V to 23V (RT7238B/C/D/E) Input Voltage Range @
8A Output Current
ACOTTM Mode Performs Fast Transient Response
ACOTTM Architecture to Enable all MLCC Output
Capacitor Usage
Fixed 500kHz Switching Frequency
High Efficient Internal Power MOSFET Switch
27mΩ (High-Side) and 10mΩ (Low-Side)
Adjustable Output Voltage from 0.6V to 5V
(RT7238D)
Fixed 3.3V (RT7238B/D) or 5V (RT7238C/E) LDO
Output Supplies 70mA
Pre-biased Soft-Start
Cycle-by-Cycle Over-Current Protection
Input Under-Voltage Lockout
Thermal Shutdown
Output Over/Under-Voltage Protection
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
Simplified Application Circuit
VIN
VLDO
VEN1
VEN2
RT7238B
VIN PGOOD
CIN BOOT
GND
LDO
CLDO
EN1
EN2
LX
VOUT
VPGOOD
CBOOT
L1
VIN
VOUT VLDO
COUT
VEN
RT7238C/E
VIN PGOOD
CIN GND BOOT
LDO
CLDO
LX
VOUT
EN
VPGOOD
CBOOT
L1
VIN
VOUT
COUT VLDO
VILMT
VEN
RT7238D
PGOOD
CIN VIN BOOT
GND
LX
LDO
CLDO
ILMT
EN
FB
BYP
VPGOOD
CBOOT
L1
CFF(opt)
R1
VBYP R2
CBYP
VOUT
COUT
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7238B/C/D/E-02 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT7238E
RT7238B/C/D/E
Marking Information
RT7238BGQUF
YB=YM
DNN
YB= : Product Code
YMDNN : Date Code
RT7238CGQUF
4R=YM
DNN
4R= : Product Code
YMDNN : Date Code
RT7238DGQUF
4V= : Product Code
4V=YM
DNN
YMDNN : Date Code
RT7238EGQUF
6L= : Product Code
6L=YM
DNN
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
BOOT
LDO
VOUT
NC
PGOOD
EN1
6
5
4
3
2
1
7
10
8 VIN
9 GND
RT7238B
BOOT
NC
VOUT
NC
PGOOD
EN
6
5
4
3
2
1
7
10
8 VIN
9 GND
RT7238C/E
BOOT
LDO
FB
ILMT
PGOOD
EN
6
5
4
3
2
1
7
10
8 VIN
9 GND
RT7238D
UQFN-10L 3x3 (FC)
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7238B/C/D/E-02 November 2015


Features ® RT7238B/C/D/E 8A, 23V, 500kHz Synchr onous Step-Down Converter with 3.3V/5V LDO General Description The RT7238B/C/ D/E is an advanced constant on-time (AC OTTM) mode synchronous step-down conver ter. The main control loop of RT7238B/C /D/E using an advanced constant on-time (ACOTTM) mode control which provides a very fast transient response. The RT72 38B/C/D/E operates from 8V to 23V input voltage. For the RT7238D, the output v oltage can be adjusted between 0.6V to 5V. Ordering Information RT7238 Package Type QUF : UQFN-10L 3x3 (FC) (U-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Output Voltage B : 3. 35V C : 5.1V D : Adjustable E : 5V Note : Richtek products are :  RoHS comp liant and compatible with the current r equirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free so ldering processes. Features  Advanc ed Constant On-Time (ACOT) Control  8V to 23V (RT7238B/C/D/E) Input Voltage Range @ 8A Output Current  ACOTTM Mode Performs Fast Transient Respons.
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