DS8048-01 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – 3MHz 1A Step-Down Converter

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.
Ordering Information
RT8048(- )
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
Output Voltage
Default : Adjustable
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
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.
Features
z 2.5V to 5.5V Input Range
z 3MHz Fix-Frequency PWM Operation
z 1A Output Current
z 90% Efficiency
z No Schottky Diode Required
z 0.6V Reference Allows Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
z RoHS Compliant and Halogen Free
Applications
z Portable Instruments
z Microprocessors and DSP Core supplies
z Cellular Phones
z Wireless and DSL Modems
z PC Cards
Pin Configurations
(TOP VIEW)
NC 1
EN 2
VIN 3
6 FB/VOUT
5 GND
7 4 LX
WDFN-6L 2x2
Marking Information
HB : Product Code
HBW ^{W : Date Code}
DS8048-01 June 2011
www.richtek.com
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