RT8055B
3A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8055B is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from 2.6V to
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 3A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The switching frequency is
set by an external resistor. The 100% duty cycle provides
low dropout operation extending battery life in portable
systems. Current mode operation with external
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
The RT8055B is operated in forced continuous PWM Mode
which minimizes ripple voltage and reduces the noise and
RF interference.
The RT8055B is available in the WDFN-10L 3x3 package.
Features
High Efficiency : Up to 95%
Low R
DS(ON)
Internal Switches : 100mΩ
Ω
Programmable Frequency : 300kHz to 2MHz
No Schottky Diode Required
0.8V Reference Voltage Allows for Low Output
Voltage
Forced Continuous Mode Operation
100% Duty Cycle Operation
Input Over Voltage Protection
Power Good Output Voltage Indicutor
RoHS Compliant and Halogen Free
Applications
Portable Instruments
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
3G/3.5G Data Card
Ordering Information
RT8055B
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (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)
SHDN/RT
GND
LX
LX
PGND
GND
1
2
3
4
5
10
9
8
7
6
11
COMP
FB
PGOOD
VDD
PVDD
WDFN-10L 3x3
Marking Information
K3= : Product Code
K3=YM
DNN
YMDNN : Date Code
DS8055B-03 April 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
