RT8008 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – 1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter

RT8008
1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC
Converter
General Description
Features
The RT8008 is a high-efficiency pulse-width-modulated
(PWM) step-down DC-DC converter. Capable of delivering
600mA output current over a wide input voltage range from
2.5V to 5.5V, the RT8008 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources within the range such
as cellular phones, PDAs and handy-terminals.
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
RT8008 automatically turns off the synchronous rectifier
while the inductor current is low and enters discontinuous
PWM mode. This can increase efficiency at light load
condition.
The RT8008 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. RT8008 enter shutdown
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 operation
frequency of 1.5MHz. This along with small SOT-23-5 and
TSOT-23-5 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.
Pin Configurations
(TOP VIEW)
EN 1 5 FB/VOUT
GND 2
LX 3 4 VIN
SOT-23-5/TSOT-23-5
l +2.5V to +5.5V Input Range
l Adjustable Output From 0.6V to V_IN
l 1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/
Adjustable Output Voltage
l 600mA Output Current, 1A Peak Current
l 95% Efficiency
l No Schottky Diode Required
l 1.5MHz Fixed-Frequency PWM Operation
l Small SOT-23-5 and TSOT-23-5 Package
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Cellular Telephones
l Personal Information Appliances
l Wireless and DSL Modems
l MP3 Players
l Portable Instruments
Ordering Information
RT8008(- )
Package Type
B : SOT-23-5
J5 : TSOT-23-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Output Voltage
Default : Adjustable
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
RichTek Pb-free and 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.
DS8008-04 March 2007
www.richtek.com
1