RT8099/A
®
DS8099/A-01 February 2015 www.richtek.com
1
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
1.5MHz, 600mA, High Efficiency PWM Step-Down Converter
General Description
The RT8099/A is a Pulse-Width-Modulated (PWM) DC/
DC step-down converter, and is capable of delivering 0.6A
output current over a wide input voltage range from 2.7V
to 5.5V. The RT8099/A is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery 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 barrier diode is required in practical
application.
The RT8099/A enters low-dropout mode when normal
PWM cannot provide regulated output voltage by
continuously turning on the high-side P-MOSFET. The
RT8099/A enters shut-down mode and consumes less
than 0.1μA when the EN pin is pulled low. The switching
ripple is easily smoothed-out by small package filtering
elements due to 1.5MHz high switching frequency. Other
features include soft-start, auto discharge, lower internal
reference voltage, over-temperature protection, and over-
current protection.
The RT8099/A is available in the small UDFN-6L 1.6x1.6
package for saving PCB space.
Features
2.7V to 5.5V Input Range
Adjustable Output from 0.7V to 5V
0.6A Output Current
95% Efficiency
No Schottky Barrier Diode Required
1.5MHz Spread Spectrum/Fixed Frequency PWM
Operation
Auto Discharge Function
Over-Current Protection
Overt-Temperature Protection
Integrated Soft-Start Function
Small 6-Lead UDFN Package
RoHS Compliant and Halogen Free
Applications
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Marking Information
Simplified Application Circuit
FB
LX
PGND
AGND
EN
RT8099/A
Enable
GND
VIN
V
BAT
V
OUT
C
IN
C
OUT
L
0U : Product Code
W : Date Code
0UW
RT8099GQU
