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  Richtek Technology Electronic Components Datasheet  

RT8020 Datasheet

Dual High-Efficiency PWM Step-Down DC-DC Converter

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®
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 RDS(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
Features
2.5V to 5.5V Input Range
Adjustable Output From 0.6V to VIN
1.2V, 1.3V, 1.8V, 2.5V and 3.3V Fixed/ Adjustable
Output Voltage
1A Output Current
95% Efficiency
No Schottky Diode Required
50uA Quiescent Current per Channel
1.5MHz Fixed Frequency PWM Operation
Small 12-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Ordering Information
RT8020
Package Type
QW : WDFN-12L 3x3 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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 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.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8020-07 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8020 Datasheet

Dual High-Efficiency PWM Step-Down DC-DC Converter

No Preview Available !

RT8020
Marking Information
RT8020APQW
C2- : Product Code
C2-YM
DNN
YMDNN : Date Code
RT8020AGQW
C2=YM
DNN
C2= : Product Code
YMDNN : Date Code
RT8020BPQW
C3-YM
DNN
C3- : Product Code
YMDNN : Date Code
RT8020BGQW
C3=YM
DNN
C3= : Product Code
YMDNN : Date Code
RT8020CPQW
C4-YM
DNN
C4- : Product Code
YMDNN : Date Code
RT8020CGQW
C4=YM
DNN
C4= : Product Code
YMDNN : Date Code
RT8020DPQW
C5-YM
DNN
C5- : Product Code
YMDNN : Date Code
RT8020DGQW
C5=YM
DNN
C5=: Product Code
YMDNN : Date Code
Typical Application Circuit
L2
2.2µH
COUT2
4.7µF
VIN2
RT8020
1 VIN2
EN2 12
4C.7INµ2F
2 LX2
3, Exposed Pad (13) GND
R12 4 FB1
NC2 11
FB2 10
GND 9
5 NC1
LX1 8
C11
22pF
R11
850k
6 EN1
VIN1 7
VOUT1
L1
2.2µH
R21
850k
CIN1
4.7µF
VIN1
 VOUTx
VREF
1
Rx1
Rx2
COUT1
4.7µF
Figure 1. Adjustable Voltage Regulator
VOUT2
C21
22pF
R22
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8020-07 August 2014


Part Number RT8020
Description Dual High-Efficiency PWM Step-Down DC-DC Converter
Maker Richtek
PDF Download

RT8020 Datasheet PDF






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