RT8020E Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Dual High-Efficiency PWM Step-Down DC/DC Converter

RT8020E
Dual High-Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8020E is a dual high-efficiency Pulse-Width-
Modulated (PWM) step-down DC/DC converter. It is
capable of delivering 1A output current over a wide input
voltage range from 2.5V to 5.5V. The RT8020E is ideally
suited for portable electronic devices that are powered by
1-cell Li-ion battery or other power sources within the range
such as cellular phones, PDAs and other hand-held
devices.
Two operational modes are available : PWM/Low-Dropout
auto-switch mode and shutdown mode. 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 RT8020E enters Low-Dropout mode when normal
PWM cannot provide regulated output voltage by
continuously turning on the upper PMOS. The RT8020E
enters shutdown 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 a fixed operation
frequency of 1.5MHz. This, along with a small
WDFN-12L 3x3 package, provides an ideal solution for
small PCB area application. Other features include soft
start, lower internal reference voltage with 2% accuracy,
over temperature protection, and over current protection.
Pin Configurations
(TOP VIEW)
VIN2 1
LX2 2
GND 3
FB1 ⁴
NC1 5
EN1 6
GND
13
12 EN2
11 _NC2
10 FB2
9 GND
8 LX1
7 VIN1
WDFN-12L 3x3
Features
z 2.5V to 5.5V Input Range
z 1.2V and 1.8V Fixed Output Voltage
z 1A Output Current
z 95% Efficiency
z No Schottky Diode Required
z 50μA Quiescent Current per Channel
z 1.5MHz Fixed Frequency PWM Operation
z Small 12-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Digital Still Cameras
z Mobile Phones
z Personal Information Appliances
z Wireless and DSL Modems
z MP3 Players
z Portable Instruments
Ordering Information
RT8020E
Package Type
QW : WDFN-12L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Fixed Output Voltage : VOUT1/VOUT2
1.2V/1.8V
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.
Marking Information
JS= : Product Code
JS=YM
DNN
YMDNN : Date code
DS8020E-02 March 2011
www.richtek.com
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