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TPS62020_16

更新时间： 2024-11-24 02:58:23
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德州仪器 - TI 功效
页数 文件大小 规格书
24页 601K
描述
600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER

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TPS62020_16 数据手册

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TPS62020  
TPS62021  
TPS62026  
www.ti.com  
SLVS076C–JUNE 2003–REVISED DECEMBER 2004  
600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER  
FEATURES  
DESCRIPTION  
•
•
•
•
•
•
•
Up to 95% Conversion Efficiency  
The TPS6202x is a high efficiency synchronous  
step-down dc-dc converter optimized for battery pow-  
ered portable applications. This device is ideal for  
portable applications powered by a single Li-Ion  
battery cell or by 3-cell NiMH/NiCd batteries. With an  
output voltage range from 6.0 V down to 0.7 V, the  
device supports low voltage DSPs and processors in  
PDAs, pocket PCs, as well as notebooks and  
subnotebook computers. The TPS6202x operates at  
a fixed switching frequency of 1.25 MHz and enters  
the power save mode operation at light load currents  
to maintain high efficiency over the entire load current  
range. For low noise applications, the device can be  
forced into fixed frequency PWM mode by pulling the  
MODE pin high. The difference between the  
TPS6202x and the TPS62021 is the logic level of the  
MODE pin. The TPS62021 has an active-low MODE  
pin. The TPS6202x supports up to 600-mA load  
current.  
Typical Quiescent Current: 18 µA  
Load Current: 600 mA  
Operating Input Voltage Range: 2.5 V to 6.0 V  
Switching Frequency: 1.25 MHz  
Adjustable and Fixed Output Voltage  
Power Save Mode Operation at Light load  
Currents  
•
•
•
•
•
•
•
•
Active-Low MODE pin on TPS62021  
100% Duty Cycle for Lowest Dropout  
Internal Softstart  
Dynamic Output Voltage Positioning  
Thermal Shutdown  
Short-Circuit Protection  
10 Pin MSOP PowerPad™ Package  
10 Pin QFN 3 X 3 mm Package  
APPLICATIONS  
•
•
•
•
•
•
PDA, Pocket PC and Smart Phones  
USB Powered Modems  
CPUs and DSPs  
PC Cards and Notebooks  
xDSL Applications  
Standard 5-V to 3.3-V Conversion  
Typical Application Circuit (600-mA Output Current)  
EFFICIENCY  
vs  
LOAD CURRENT  
V
V
O
100  
L1  
I
TPS62020  
V
= 1.8 V  
O
0.7 V to V / 600 mA  
I
10 µH  
2.5 V to 6 V  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
45  
40  
8
7
2
3
SW  
VIN  
V
= 2.7 V  
I
SW  
FB  
VIN  
C3  
10 µF  
C4  
10 µF  
5
10  
9
1
6
R1  
EN  
V
= 3.6 V  
I
C1  
PGND  
MODE  
GND  
V
= 5 V  
I
4
PGND  
Mode = Low  
R2  
C2  
V
= 3.6 V  
I
Mode = High  
0
0.01 0.10  
1
10  
100 1000  
I
L
− Load Current − mA  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PowerPad is a trademark of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2003–2004, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
1234567...24

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