Preliminary
RT8010B
1.5MHz, 800mA, High Efficiency PWM
Step-Down DC/DC Converter
General Description
The RT8010B is a high-efficiency Pulse-Width-Modulated
(PWM) step-down DC-DC converter. Capable of delivering
800mA output current over a wide input voltage range from
2.5V to 4V, the RT8010B is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources such as cellular
phones, PDAs and hand-held devices.
Two operating modes are available including PWM/Low-
Dropout autoswitch and shut-down modes. The internal
synchronous rectifier with low R
DS(ON)
dramatically reduces
conduction loss at PWM mode. No external Schottky
diode is required in practical application.
The RT8010B enters Low-Dropout mode when normal
PWM can not provide regulated output voltage by
continuously turning on the upper PMOS. The RT8010B
enters shut-down mode and consumes less than 0.1μA
when EN pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operating
frequency of 1.5MHz. This along with small WDFN-8L 2x2
package provides small PCB area application. Other
features include soft start, lower internal reference voltage
with 2% accuracy, over temperature protection, and over
current protection.
Features
+2.5V to +4V Input Range
Output Voltage (Adjustable Output From 0.6V to V
IN
)
800mA Output Current
95% Efficiency
No Schottky Diode Required
1.5MHz Fixed-Frequency PWM Operation
Small 8-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Pin Configurations
(TOP VIEW)
EN
FB
VIN
LX
1
2
3
4
8
9
7
6
5
PGND
PGND
PGND
AGND
WDFN-8L 2x2
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Ordering Information
RT8010B
Package Type
QW : WDFN-8L 2x2 (W-Type)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Green 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.
100% matte tin (Sn) plating.
DS8010B-00 July 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
