RT8283B
3A, 23V, 1.2MHz Synchronous Step-Down Converter
General Description
The RT8283B is a high-efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 3A
output current from a 4.5V to 23V input supply. The
RT8283B's current mode architecture and external
compensation allow the transient response to be
optimized over a wide range of loads and output capacitors.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. The RT8283B provides output under
voltage protection and thermal shutdown protection. The
low current (<3μA) shutdown mode provides output
disconnect, enabling easy power management in battery-
powered systems. The RT8283B is available in a
SOP-8 (Exposed Pad) package.
Features
±
1.5% High Accuracy Feedback Voltage
4.5V to 23V Input Voltage Range
3A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 1.2MHz
Adjustable Output from 0.8V to 20V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low-ESR Ceramic Output Capacitors
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Ordering Information
RT8283B
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
H : UVP Hiccup
L : UVP Latch-Off
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.
Applications
Wireless AP/Router
Set-Top-Box
Industrial and Commercial Low Power Systems
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation of High-Performance DSPs
Pin Configurations
(TOP VIEW)
BOOT
VIN
2
3
4
8
SS
EN
COMP
FB
Marking Information
RT8283BGSP : Product Number
RT8283B
xGSPYMDNN
SW
GND
GND
9
7
6
5
x : H or L
YMDNN : Date Code
SOP-8 (Exposed Pad)
DS8283B-01 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
