RT8020GQW Richtek USA Inc, RT8020GQW Datasheet

RT8020GQW

Manufacturer Part Number

RT8020GQW

Description

IC DCDC CONV STP-DN DUAL 12WDFN

Manufacturer

Richtek USA Inc

Type

Step-Down (Buck), PWMr

Datasheet

1.RT8020AGQW.pdf (14 pages)

Specifications of RT8020GQW

Internal Switch(s)

Yes

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

0.6 V ~ 5.5 V

Current - Output

Frequency - Switching

1.5MHz

Voltage - Input

2.5 V ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

12-WFDFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Download datasheet (263Kb)

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

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 0.1 A when EN pin is pulled

low.

The switching ripple is easily smoothed-out by small

package filtering elements due to a fixed operation

f requency of 1.5MHz. This along wit h sm all

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

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.

DS8020-04 February 2011

DS(ON)

VIN2

GND

NC1

EN1

FB1

LX2

WDFN-12L 3x3

(TOP VIEW)

dramatically reduces conduction

GND

EN2

NC2

FB2

GND

LX1

VIN1

Features

Applications

Ordering Information

RT8020

Note :

Richtek Pb-free and Green products are :

}

2.5V to 5.5V Input Range

Adjustable Output From 0.6V to V

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

Mobile Phones

Personal Information Appliances

Wireless and DSL Modems

MP3 Players

Portable Instruments

ments of IPC/JEDEC J-STD-020.

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

100% matte tin (Sn) plating.

Package Type

QW : WDFN-12L 3x3 (W-Type)

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

RT8020

www.richtek.com

Related parts for RT8020GQW

RT8020GQW Summary of contents

Page 1

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 capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V, the RT8020 ...

Page 2

RT8020 Typical Application Circuit V IN2 C IN2 4.7µF R12 C11 22pF V OUT1 Rx1 OUTx REF Rx2 V V OUT1 V = 1.2V, 1.3V, 1.8V, 2.5V or 3.3V OUTx www.richtek.com 2 L2 2.2µH RT8020 1 VIN2 ...

Page 3

Functional Pin Description Pin No. Pin Name 1 VIN2 2 LX2 3, 9, GND Exposed Pad (13) 4 FB1 5, 11 NC1, NC2 6 EN1 7 VIN1 8 LX1 10 FB2 12 EN2 Function Block Diagram Slope Compensation Amplifier FBx ...

Page 4

RT8020 Absolute Maximum Ratings Supply Input Voltage IN1 IN2 EN1, FB1, LX1, EN2, FB2 and LX2 Pin Voltage -------------------------------------------------------------- 0. Power Dissipation WDFN-12L 3x3 ...

Page 5

Parameter Output Voltage Adjustable Accuracy FB Input Current R of P-MOSFET DS(ON N-MOSFET DS(ON) P-Channel Current Limit EN Input Voltage Logic-High EN Input Voltage Logic-Low Oscillator Frequency Thermal Shutdown Temperature Maximum Duty Cycle LX Leakage Current Note 1. ...

Page 6

RT8020 Typical Operating Characteristics Efficiency vs. Output Current 100 3.3V 4 OUT 0 ...

Page 7

Output Voltage vs. Loading Current 1.230 1.225 1.220 1.215 V 1.210 1.205 V 1.200 1.195 1.190 1.185 1.180 0 0.1 0.2 0.3 0.4 Loading Current (A) Switching Frequency vs. Input Voltage 1.60 1.55 1.50 1.45 1.40 1.35 1.30 1.25 V ...

Page 8

RT8020 Power On from 3.6V 1.2V OUT V EN (2V/Div) V OUT (1V/Div (500mA/Div) Time (100μs/Div) Power On from 3.6V 1.2V OUT V IN ...

Page 9

Load Transient Response V = 5.0V 1.2V OUT V OUT (50mV/Div) I OUT (500mA/Div) Time (50μs/Div) Ripple V = 3.6V 1.2V OUT V OUT (10mV/Div (2V/Div) Time (500ns/Div) DS8020-04 February ...

Page 10

RT8020 Applications Information The basic RT8020 application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by C and ...

Page 11

The output ripple is highest at maximum input voltage since I increases with input voltage. Multiple capacitors L placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ...

Page 12

RT8020 and the synchronous switch. Thus, the series resistance looking into the LX pin is a function of both top and bottom MOSFET R and the duty cycle (DC) is shown as DS(ON) follows : ...

Page 13

Component Supplier TAIYO YUDEN TAIYO YUDEN Sumida CDRH2D14 Sumida CDRH2D14 GOTREND GOTREND Component Supplier TDK TDK MURATA MURATA TAIYO YUDEN TAIYO YUDEN TAIYO YUDEN DS8020-04 February 2011 Table 1. Recommended Inductors Inductance Series ( H) NR 3015 2.2 NR 3015 ...

Page 14

RT8020 Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation ...

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