RT8008

Features:

· +2.5V to +5.5V Input Range
· Adjustable Output From0.6V to VIN
· 1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/
Adjustable Output Voltage
· 600mA Output Current, 1A Peak Current
· 95%Efficiency
· No Schottky Diode Required
·1.5MHz Fixed-Frequency PWM Operation
· Small SOT-23-5 and TSOT-23-5 Package
· RoHS Compliant and 100%Lead (Pb)-Free




Application

· Cellular Telephones
· Personal InformationAppliances
·Wireless andDSLModems
· MP3 Players
· Portable Instruments




Pinout






Specifications

Supply Input Voltage .......................... 6.5V
Enable, FB Voltage ........................ V_IN + 0.6V
Power Dissipation, P_D@ T_A = 25°C
SOT-23-5, TSOT-23-5 ..........................0.4W
Package Thermal Resistance (Note 4)
SOT-23-5, TSOT-23-5, _JA ..................... 250°C/W
SOT-23-5,TSOT-23-5, _JC ..................... 130°C/W
Junction Temperature Range .....................150°C
Lead Temperature (Soldering, 10 sec.) ................260°C
Storage Temperature Range ................ -65°C to 150°C
ESD Susceptibility (Note 2)
HBM(Human Body Mode) ......................... 2kV
MM(MachineMode) ........................... 200V




Description

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 0.1mA 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.

The RT8008 is a high-efficiency pulse-width-modulated (PWM) step-downDC-DCconverter. Capable of delivering 600mAoutput current over awide 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 sourceswithin the range such as cellular phones, PDAs and handy-terminals.

Internal synchronous rectifier with low RDS(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 lowand enters discontinuous PWM mode. This can increase efficiency at light load condition.

TheRT8008 entersLow-Dropoutmodewhen normalPWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. RT8008 enter shutdown mode and consumes less than 0.1mAwhenENpin 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.