DC/DC Converter. RT8020E Datasheet


RT8020E Converter. Datasheet pdf. Equivalent


Part Number

RT8020E

Description

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

Manufacture

Richtek

Total Page 14 Pages
Datasheet
Download RT8020E Datasheet


RT8020E
®
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 RDS(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
2.5V to 5.5V Input Range
1.2V and 1.8V Fixed Output Voltage
1A Output Current
95% Efficiency
No Schottky Diode Required
50μA Quiescent Current per Channel
1.5MHz Fixed Frequency PWM Operation
Small 12-Lead WDFN Package
RoHS Compliant and Halogen Free
Applications
Digital Still Cameras
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Ordering Information
RT8020E
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)
Fixed Output Voltage : VOUT1/VOUT2
1.2V/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.
Marking Information
JS= : Product Code
JS=YM
DNN
YMDNN : Date code
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8020E-04 August 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8020E
RT8020E
Typical Application Circuit
L2
4.7µH
VIN2
RT8020E
1 VIN2
EN2 12
CIN2
4.7µF
2 LX2
3, 13 (Exposed Pad) GND
4 FB1
NC2 11
FB2 10
GND 9
5 NC1
LX1 8
6 EN1
VIN1 7
VOUT1
1.2V
COUT1
10µF
L1
4.7µH
VOUT2
1.8V
COUT2
10µF
CIN1
4.7µF
VIN1
Functional Pin Description
Pin No.
Pin Name
1 VIN2
2 LX2
3, 9,
13 (Exposed Pad)
GND
4 FB1
5, 11
NC1, NC2
6 EN1
7 VIN1
8 LX1
10 FB2
12 EN2
Pin Function
Power Input of Channel 2.
Pin for Switching of Channel 2.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Feedback of Channel 1.
No Internal Connection or Connect to VIN.
Chip Enable of Channel 1 (Active High). VEN1 VIN1.
Power Input of Channel 1.
Pin for Switching of Channel 1.
Feedback of Channel 2.
Chip Enable of Channel 2 (Active High). VEN2 VIN2.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8020E-04 August 2016


Features ® RT8020E Dual High-Efficiency PWM Ste p-Down DC/DC Converter General Descrip tion The RT8020E is a dual high-efficie ncy Pulse-WidthModulated (PWM) step-dow n DC/DC converter. It is capable of del ivering 1A output current over a wide i nput voltage range from 2.5V to 5.5V. T he RT8020E is ideally suited for portab le electronic devices that are powered by 1-cell Li-ion battery or other power sources within the range such as cellu lar phones, PDAs and other hand-held de vices. Two operational modes are availa ble : PWM/Low-Dropout auto-switch mode and shutdown mode. Internal synchronous rectifier with low RDS(ON) dramaticall y reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8020E e nters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P MOS. The RT8020E enters shutdown mode a nd consumes less than 0.1μA when the E N pin is pulled low. The switching ripple is easily smoothed-out .
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