RT8055 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – 3A, 2MHz, Synchronous Step-Down Converter

®
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.
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.
Ordering Information
RT8055
Package Type
QW : WDFN-10L 3x3 (W-Type)
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Features
z High Efficiency : Up to 95%
z Low R_DS(ON) Internal Switches : 100mΩ
z Programmable Frequency : 300kHz to 2MHz
z No Schottky Diode Required
z 0.8V Reference Voltage Allows for Low Output
Voltage
z Forced Continuous Mode Operation
z 100% Duty Cycle Operation
z Input Over Voltage Protection
z RoHS Compliant and Halogen Free
Applications
z Portable Instruments
z Battery-Powered Equipment
z Notebook Computers
z Distributed Power Systems
z IP Phones
z Digital Cameras
z 3G/3.5GData Card
Pin Configurations
(TOP VIEW)
SHDN/RT 1
GND 2
LX 3
LX ⁴
PGND 5
10 _COMP
9 _FB
8 VDD
7 PVDD
11 6 PVDD
WDFN-10L 3x3
SHDN/RT
GND
LX
PGND
8
2
7
GND
3
6
9
4
5
COMP
FB
VDD
PVDD
SOP-8 (Exposed Pad)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8055-05 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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