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TPS40222

更新时间： 2024-11-20 08:39:03
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
26页 698K
描述
1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm 3 mm SON PACKAGE

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TPS40222 数据手册

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TPS40222  
www.ti.com  
SLUS642A–OCTOBER 2005–REVISED JANUARY 2006  
1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm × 3 mm SON PACKAGE  
FEATURES  
APPLICATIONS  
•
•
•
•
Disk Drives  
Set Top Box  
Point of Load Power  
ASIC Power Supplies  
•
•
•
•
•
•
•
Input Voltage Range 4.5 VDC to 8 VDC  
Output Voltage (0.8 V to 90% VIN)  
0 A to 1.6 A Current Capability  
Fixed 1.25-MHz Switching Frequency  
Reference 0.8 V ±1%  
DESCRIPTION  
Internal 250 mΩ N-Channel MOSFET Switch  
The TPS40222 is a fixed-frequency, current-mode,  
non-synchronous buck converter optimized for  
applications powered by a 5-V distributed source.  
With internally determined operating frequency,  
soft-start time, and control loop compensation, the  
TPS40222 provides many features with a minimum of  
external components.  
Current Mode Control with Internal Slope  
Compensation  
•
•
•
•
•
•
Internal Soft-Start  
Internal Loop Compensation  
Short Circuit Protection  
Thermal Shutdown  
The TPS40222 operates at 1.25 MHz and supports  
up to 1.6-A output loads. The output voltage can be  
programmed to as low as 0.8 V. The TPS40222  
utilizes pulse-by-pulse current limit as well as  
frequency foldback to protect the converter during a  
catastrophic short circuited output condition.  
High Efficiency Up to 92%  
Small 3 mm × 3 mm SON Package  
SIMPLIFIED APPLICATION DIAGRAM  
TYPICAL EFFICIENCY  
vs  
LOAD CURRENT  
V
IN  
100  
V
IN  
= 5 V  
95  
90  
85  
C1  
6
5
4
BOOST AVIN PVIN  
TPS40222  
C2  
V
OUT  
= 3.3 V  
FB GND SW  
1
2
3
80  
V
OUT  
L1  
75  
70  
R1  
C3  
D1  
V
OUT  
= 1.25 V  
65  
60  
R2  
UDG−04135  
0
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
I
− Load Current − A  
LOAD  
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.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005–2006, Texas Instruments Incorporated  
1234567...26

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