RT8048
3MHz 1A Step-Down Converter
General Description
The RT8048 is a high-efficiency Pulse-Width-Modulated
(PWM) step-down DC/DC converter. Capable of delivering
1A output current over a wide input voltage range from
2.5V to 5.5V, the RT8048 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 auto
switch and shut-down mode. 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 RT8048 enters Low-
Dropout mode when normal PWM cannot provide regulated
output voltage by continuously turning on the upper
P-MOSFET. The RT8048 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
3MHz.
Features
2.5V to 5.5V Input Range
3MHz Fix-Frequency PWM Operation
1A Output Current
90% Efficiency
No Schottky Diode Required
0.6V Reference Allows Low Output Voltage
Low Dropout Operation : 100% Duty Cycle
RoHS Compliant and Halogen Free
Applications
Portable Instruments
Microprocessors and DSP Core supplies
Cellular Phones
Wireless and DSL Modems
PC Cards
Pin Configurations
(TOP VIEW)
GND
NC
1
2
3
6
5
4
FB/VOUT
GND
LX
Ordering Information
RT8048(
-
)
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Output Voltage
Default : Adjustable
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
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.
EN
VIN
7
WDFN-6L 2x2
Marking Information
HB : Product Code
HBW
W : Date Code
DS8048-01 June 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
