DS6203B Datasheet, PDF (1/22 Pages) Richtek Technology Corporation – 5A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter with VID Control

®
RT6203B
5A, 18V, 700kHz ACOT^TM Synchronous Step-Down
Converter with VID Control
General Description
The RT6203B is an adaptive on-time mode synchronous
Buck converter. The main control loop of the RT6203B
uses an adaptive on-time mode control which provides a
very fast transient response with no external components.
The RT6203B operates from 4.5V to 18V VIN input. After
the initial power-up, the output voltage can be changed by
codes sent into the IC via an I²C compatible VID control
bus. There are special codes which can be used to program
current limit level and thermal shutdown level. Shutdown
and startup can be also programmed by special codes.
The device also features an adjustable soft-start time.
Output voltage is adjustable by resistor divider through
the FB pin between 0.8V to 8V.
Pin Configuration
(TOP VIEW)
Features
 VID Control Range Via I²C Compatitable Interface :
0.72V to 1.48V in 10mV Steps
 Adjustable Current Limit
 Adjustable Thermal Shutdown
 Fast Transient Response
 Adjustable Output Voltage from 0.8V to 8V
 Steady 700kHz Switching Frequency
 Optimized for All Ceramic Capacitors
 Externally-Adjustable, Pre-Biased Compatible Soft-
Start
 Input Under-Voltage Lockout
 Output Over- and Under-Voltage Protection
 Power Good Output
 Thermal Shutdown
 RoHS Compliant and Halogen Free
20 19 18 17 16
PVCC 1
PGOOD 2
A0 3
A1 4
SCL 5
PGND
21
15 SW
14 SW
13 _SW
12 _PGND
11 _PGND
6 7 8 9 10
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
WQFN-20L 4x4
Simplified Application Circuit
V_IN
Power Good
Enable
I²C Control
C1
R3
C3
RT6203B
VIN
VS
VCC
SW
PGOOD BOOT
PVCC
FB
SS
EN
SCL
SDA
A0
A1
PGND AGND
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS6203B-00 September 2016
L1
C4
C5
R1
C_FF
V_OUT
R2
C_SS
Address
Selection
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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