RT8290
3A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8290 is a high efficiency synchronous step-down
DC/DC converter that can deliver up to 3A output current
from 4.5V to 23V input supply. The RT8290'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 RT8290 also
provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown
mode provides output disconnection, enabling easy power
management in battery-powered systems. The RT8290
is awailable in an SOP-8 (Exposed Pad) package.
Features
4.5V to 23V Input Voltage Range
1.5% High Accuracy Feedback Voltage
3A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.925V 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
Thermally Enhanced SOP-8 (Exposed Pad) Package
RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation of High-Performance DSPs,
FPGAs and ASICs.
Ordering Information
RT8290
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
2
3
4
8
SS
EN
COMP
FB
GND
9
7
6
5
SOP-8 (Exposed Pad)
Typical Application Circuit
V
IN
4.5V to 23V
2
R
EN
100k
C
IN
10µFx2
VIN
BOOT
RT8290
7 EN
8 SS
C
SS
0.1µF
4,
9 (Exposed Pad)
SW 3
1
C
BOOT
L1
10nF 10µH
R1
26.1k
FB 5
COMP
6
C
C
R
C
3.9nF 6.8k
R2
10k
V
OUT
3.3V/3A
C
OUT
22µFx2
GND
C
P
NC
DS8290-02 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
