RT8024

1

DS8024-02

March 2011

www.richtek.com

Features

2.5V to 5.5V Input Range

1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/

Adjustable Output Voltage

400mA 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 Halogen Free

Applications

Cellular Telephones

Personal Information Appliances

Wireless and DSL Modems

MP3 Players

Portable Instruments

1.5MHz, 400mA, High Efficiency PWM Step-Down

DC/DC Converter

General Description

The RT8024 is a high-efficiency pulse-width-modulated

(PWM) step-down DC/DC converter. Capable of delivering

400mA output current over a wide input voltage range from

2.5V to 5.5V, the RT8024 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.

reduces conduction loss at PWM mode. No external

Schottky diode is required in practical application. The

RT8024 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 RT8024 enters Low-Dropout mode when normal PWM

cannot provide regulated output voltage by continuously

turning on the upper P-MOSFET. RT8024 enter shutdown

mode and consumes less than 0.1

μAwhen ENpin 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.

Note :

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.

Ordering Information

Pin Configurations

(TOP VIEW)

SOT-23-5/TSOT-23-5

EN GND LX

FB/VOUT

VIN

4

23

5

RT8024(-

)

Package Type

B : SOT-23-5

J5 : TSOT-23-5

Output Voltage

Default : Adjustable

10 : 1.0V

12 : 1.2V

15 : 1.5V

18 : 1.8V

25 : 2.5V

33 : 3.3V

Lead Plating System

G : Green (Halogen Free and Pb Free)

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.