®
RT8055
3A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8055 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.
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
RoHS Compliant and Halogen Free
The RT8055 is operated in forced continuous PWM Mode
which minimizes ripple voltage and reduces the noise and
RF interference.
The RT8055 is available in the WDFN-10L 3x3 and
SOP-8 (Exposed Pad) packages.
深
圳
�½�
富
5
5
Applications
维
电
子
Portable Instruments
5
2
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
3G/3.5G Data Card
8
/
际
1
2
3
0
5
4
4
2
GND
Ordering Information
RT8055
Package Type
QW : WDFN-10L 3x3 (W-Type)
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
Richtek products are :
5
7
0
-
5
3
2
强
1
8
Pin Configurations
(TOP VIEW)
1
2
3
4
5
10
9
8
7
6
大
厦
室
5
0
8
COMP
FB
VDD
PVDD
PVDD
北
诚
鼎
�½
SHDN/RT
GND
LX
LX
PGND
11
WDFN-10L 3x3
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.
深
圳
市
华
SHDN/RT
GND
LX
PGND
2
3
4
8
COMP
FB
VDD
PVDD
GND
9
7
6
5
SOP-8 (Exposed Pad)
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8055-05
November 2012
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
