rt8020 Richtek Technology Corporation, rt8020 Datasheet

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rt8020

Manufacturer Part Number
rt8020
Description
Dual High-efficiency Step-down Dc-dc Converter
Manufacturer
Richtek Technology Corporation
Datasheet

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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.
DS8020-03 August 2007
DS(ON)
VIN2
GND
NC1
EN1
FB1
LX2
WDFN-12L 3x3
(TOP VIEW)
1
2
3
4
5
6
dramatically reduces conduction
GND
13
10
12
11
9
8
7
EN2
NC2
FB2
GND
LX1
VIN1
Features
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Applications
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Ordering Information
Note :
Richtek Pb-free and Green products are :
RT8020
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+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
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
Package Type
QW : WDFN-12L 3x3 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
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
cial Standard)
IN
RT8020
www.richtek.com
1

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rt8020 Summary of contents

Page 1

... 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 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 ...

Page 2

... NC2 3, Exposed Pad (13) GND FB2 4 FB1 GND 5 NC1 LX1 6 EN1 R11 VIN1 850k L1 2.2uH C OUT1 4.7uF Figure 1. Adjustable Voltage Regulator L2 2.2uH RT8020 IN2 1 VIN2 EN2 C 2 IN2 LX2 NC2 4.7uF 3, Exposed Pad (13) FB2 GND 4 FB1 GND 5 NC1 LX1 VIN1 7 6 EN1 L1 2 ...

Page 3

... Chip Enable of Channel 2 (Active High). V ENx OSC and Current Limit Shutdown Detector Control Current Sense PWM Comparator Control Error UVLO and RC Power Good Detector COMP V REF Pin Function . IN ≦ V EN1 IN1. ≦ V EN2 IN2. VINx RS1 Driver Logic RS2 RT8020 LXx GND www.richtek.com 3 ...

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 ------------------------------------------------------------------------------------------------------- 1.667W Package Thermal Resistance (Note 4) l WDFN-12L 3x3, -------------------------------------------------------------------------------------------------- 60 C/W JA WDFN-12L 3x3, ------------------------------------------------------------------------------------------------- 8.2 C/W JC Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260 C ...

Page 5

... OUT 2.5V to 5.5 V LIM_P 2.5V to 5.5V EN_H 2.5V to 5.5V EN_L 3.6V 100mA OSC IN OUT 3.6V high effective four layers thermal conductivity test board of A RT8020 Min Typ (Note 2.5V 0. 3.6V 0. 2.5V 0. 3.6V 0.25 IN 1.4 1.5 1 ...

Page 6

... RT8020 Typical Operating Characteristics Efficiency vs. Output Current 100 3.3V 4 OUT 0 0 0.1 0.2 0.3 0.4 Output Current (A) Efficiency vs. Output Current 100 1.2V 2 OUT 0 0 0.1 0.2 0.3 0.4 Output Current (A) EN Pin Threshold vs. Input Voltage 1.20 1.15 1.10 1.05 Rising 1 ...

Page 7

... Temperature ( C) Switching Frequency vs. Temperature 1.6 1.55 1.5 1.45 1.4 1.35 1.3 1. 3.6V 1.2V OUT 1.2 -40 -25 - Temperature ( C) Output Current Limit vs. Temperature 2.4 2 5.0V IN 2.2 2 3.6V IN 2.0 1.9 1 3.3V IN 1.7 1.6 1.5 1.4 -40 -25 - Temperature ( C) RT8020 V = 3.6V OUT 110 125 = 300mA OUT 110 125 V = 1.2V OUT 110 125 www.richtek.com 7 ...

Page 8

... RT8020 Power On from 3.6V 1.2V OUT V EN (2V/Div) V OUT (1V/Div (500mA/Div) Time (100 s/Div) Power On from 3.6V 1.2V OUT V IN (2V/Div) V OUT (1V/Div (1A/Div) Time (250 s/Div) Load Transient Response V = 3.6V 1.2V OUT V OUT (50mV/Div) I OUT (500mA/Div) Time (50 s/Div) www ...

Page 9

... OUT (10mV/Div (2V/Div) Time (500ns/Div) DS8020-03 August 2007 = 50mA to 1A OUT V OUT (50mV/Div) I (500mA/Div OUT V OUT (10mV/Div) (2V/Div) Load Transient Response V = 5.0V 1.2V OUT OUT OUT Time (50 s/Div) Ripple V = 5.0V 1.2V OUT OUT V LX Time (500ns/Div) RT8020 = 50mA to 0. www.richtek.com 9 ...

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 OUT Inductor Selection For a given input and output voltage, the inductor value and operating frequency determine the ripple current ...

Page 11

... IN quiescent current oppears due to two and Q are the gate charges of the internal top losses are calculated from the resistances of the and external inductor R SW RT8020 loss IN that is typically www.richtek.com 11 ...

Page 12

... C) / (60 C/W) = 1.667W for D(MAX) WDFN-12L 3x3 packages The maximum power dissipation depends on operating ambient temperature for fixed T resistance . For RT8020 packages, the Figure 4 of de- JA rating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. www.richtek.com 12 ...

Page 13

... JMK107BJ106MA JMK212BJ106RD DCR Current Rating (m ) (mA) 60 1480 120 1020 75 1500 4.5 x 3.2 x 1.55 135 1000 4.5 x 3.2 x 1.55 58 1500 3.85 x 3.85 x 1.8 146 1100 3.85 x 3.85 x 1.8 and C IN OUT Capacitance ( F) 4.7 10 4 RT8020 Dimensions (mm 1 1.5 Case Size 0603 0805 0603 0805 0603 0603 0805 www.richtek.com 13 ...

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 www.richtek.com 14 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Dimensions In Millimeters ...

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