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TPS54325

更新时间： 2024-11-05 07:04:47
品牌 Logo 应用领域
德州仪器 - TI 输出元件
页数 文件大小 规格书
20页 1055K
描述
4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFT™)

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TPS54325 数据手册

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TPS54325  
www.ti.com ................................................................................................................................................................ SLVS932A–MAY 2009–REVISED JULY 2009  
4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN  
SWITCHER WITH INTEGRATED FET (SWIFT™)  
1
FEATURES  
DESCRIPTION  
23  
•
D-CAP2™ Mode Enables Fast Transient  
Response  
The TPS54325 is an adaptive on-time D-CAP2™  
mode synchronous buck converter. The TPS54325  
enables system designers to complete the suite of  
various end equipment’s power bus regulators with a  
cost effective, low component count, low standby  
current solution. The main control loop for the  
TPS54325 uses the D-CAP2™ mode control which  
provides a very fast transient response with no  
external components. The TPS54325 also has a  
proprietary circuit that enables the device to adapt to  
both low equivalent series resistance (ESR) output  
capacitors, such as POSCAP or SP-CAP, and  
ultra-low ESR ceramic capacitors. The device  
operates from 4.5-V to 18-V VCC input , and from  
2.0-V to 18-V VIN input power supply voltage. The  
output voltage can be programmed between 0.76 V  
and 5.5 V. The device also features an adjustable  
slow start time and a power good function. The  
TPS54325 is available in the 14 pin HTSSOP  
package, and designed to operate from –40 °C to 85  
°C.  
•
Low Output Ripple and Allows Ceramic Output  
Capacitor  
•
•
•
•
Wide VCC Input Voltage Range: 4.5 V to 18 V  
Wide VIN Input Voltage Range: 2.0 V to 18 V  
Output Voltage Range: 0.76 V to 5.5 V  
Highly Efficient Integrated FET’s Optimized  
for Lower Duty Cycle Applications  
- 120 mΩ (High Side) and 70 mΩ (Low Side)  
•
•
•
•
•
•
•
High Efficiency, less than 10 µA at shutdown  
High Initial Bandgap Reference Accuracy  
Adjustable Soft Start  
Pre-Biased Soft Start  
700-kHz Switching Frequency (fSW  
)
Cycle By Cycle Over Current Limit  
Power Good Output  
APPLICATIONS  
•
Wide Range of Applications for Low Voltage  
System  
–
–
–
–
Digital TV Power Supply  
High Definition Blue-ray Disc™ Players  
Networking Home Terminal  
Digital Set Top Box (STB)  
VIN  
C4  
SGND  
PGND  
VOUT (50 mV / div)  
14  
13  
1
2
VCC  
VO  
R1  
8.42 kΩ  
VFB  
VIN  
VBST  
SW2  
R2  
22 kΩ  
C3  
10 µF  
3
POWERPAD  
TPS54325  
PWP  
12  
11  
C2  
0.1 µF  
VREG5  
C5  
1 µF  
SGND  
VO1  
4
SS  
L1  
1.5 µH  
1.05 V / 3 A  
PGND  
C6  
HTSSOP14  
C1  
5
6
10  
9
GND  
SW1  
IOUT (2 A / div)  
SGND  
Output  
Signal  
PG  
EN  
PGND2  
PGND1  
Input  
Signal  
7
PGND  
8
100 µs / div  
1
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.  
2
3
SWIFT, D-CAP2, PowerPAD are trademarks of Texas Instruments.  
Blue-ray Disc is a trademark of Blu-ray Disc.  
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 © 2009, Texas Instruments Incorporated  
1234567...20

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TPS54325 替代型号

型号 品牌 替代类型 描述 数据表
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