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TPS54495

更新时间： 2024-12-01 12:47:11
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德州仪器 - TI /
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23页 932K
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4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET

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TPS54495  
www.ti.com  
SLVSBH0 –JUNE 2012  
4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET  
Check for Samples: TPS54495  
1
FEATURES  
APPLICATIONS  
2
•
D-CAP2™ Control Mode  
•
Point-of-Load Regulation in Low Power  
Systems for Wide Range of Applications  
–
–
Fast Transient Response  
–
–
–
–
–
Digital TV Power Supply  
Networking Home Terminal  
Digital Set Top Box (STB)  
DVD Player/Recorder  
No External Parts Required For Loop  
Compensation  
–
Compatible with Ceramic Output  
Capacitors  
•
•
•
Wide Input Voltage Range : 4.5 V to 18 V  
Output Voltage Range : 0.76V to 7.0V  
Gaming Consoles and Other  
DESCRIPTION  
Highly Efficient Integrated FETs Optimized for  
Low Duty Cycle Applications  
The TPS54495 is a dual, adaptive on-time D-CAP2™  
mode synchronous buck converter. The TPS54495  
enables system designers to complete the suite of  
various end equipment’s power bus regulators with a  
cost effective, low component count, and low standby  
current solution. The main control loops of the  
TPS54495 use the D-CAP2™ mode control which  
provides a very fast transient response with no  
external compensation components. The adaptive on-  
time control supports seamless transition between  
PWM mode at higher load conditions and Eco-  
mode™ operation at light loads. Eco-mode™ allows  
the TPS54495 to maintain high efficiency during  
lighter load conditions. The TPS54495 is able 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  
provides convenient and efficient operation with input  
voltages from 4.5V to 18V.  
–
90 mΩ (High Side) and 60 mΩ (Low Side)  
•
•
High Initial Reference Accuracy  
Supports Constant 4 A CH1 and 2 A CH2 Load  
Current  
•
•
•
•
•
•
•
•
Low-Side rDS(on) Loss-Less Current Sensing  
Adjustable Soft Start  
Non-Sinking Pre-Biased Soft Start  
700 kHz Switching Frequency  
Cycle-by-Cycle Over-Current Limit Control  
OCL/UVLO/TSD Protections  
Hiccup Timer for Overload Protection  
Adaptive Gate Drivers with Integrated Boost  
PMOS Switch  
•
OCP Constant Due To Thermally Compensated  
rDS(on) with 4000ppm/℃  
The TPS54495 is available in a 4.4mm×5.0mm 16 pin  
TSSOP (PWP) package, and is specified for an  
ambient temperature range from –40°C to 85°C.  
•
•
16-Pin HTSSOP  
Auto-Skip Eco-mode™ꢀfor High Efficiency at  
Light Load  
Input Voltage  
Vout2(50mV/div)  
1
VIN2  
VIN1  
16  
15  
C11  
2
3
VBST1  
VBST2  
C12  
VO1  
C32  
L12  
L11  
VO2  
C31  
C41  
SW2 14  
SW1  
C21  
C22  
4
5
PGND1  
EN1  
PGND213  
EN2 12  
TPS54495  
Iout2(1A/div)  
HTSSOP16  
PGND  
PGND  
C42  
C5  
SS1  
6
SS2 11  
R11  
R21  
SGND  
SGND  
R12  
VFB1  
GND  
10  
VFB2  
7
8
R22  
9
100 ms/div  
VREG5  
PGND  
SGND  
SGND  
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
D-CAP2, Eco-mode, Eco-Mode are trademarks of Texas Instruments.  
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 © 2012, Texas Instruments Incorporated  
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