RT8020 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Dual High-Efficiency PWM Step-Down DC-DC Converter

RT8020
Dual High-Efficiency PWM Step-Down DC-DC Converter
General Description
The RT8020 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 RT8020 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 other hand-
held devices.
Two operational modes are available : PWM/Low-Dropout
auto-switch and shutdown modes. 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 RT8020 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper PMOS. The RT8020 enter shutdown
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 operation
frequency of 1.5MHz. This along with small
WDFN-12L 3x3 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.
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
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Features
l +2.5V to +5.5V Input Range
l Adjustable Output From 0.6V to V_IN
l 1.2V, 1.3V, 1.8V, 2.5V and 3.3V Fixed/ Adjustable
Output Voltage
l 1A Output Current
l 95% Efficiency
l No Schottky Diode Required
l 50uA Quiescent Current per Channel
l 1.5MHz Fixed-Frequency PWM Operation
l Small 12-Lead WDFN Package
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Mobile Phones
l Personal Information Appliances
l Wireless and DSL Modems
l MP3 Players
l Portable Instruments
Ordering Information
RT8020
Package Type
QW : WDFN-12L 3x3 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage : VOUT1/VOUT2
Default : Adjustable
A : 3.3V/1.8V
B : 3.3V/1.3V
C : 3.3V/1.2V
D : 2.5V/1.8V
Note :
Richtek Pb-free and Green 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.
}100% matte tin (Sn) plating.
DS8020-03 August 2007
www.richtek.com
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