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TPS542951

更新时间： 2024-09-19 12:47:11
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德州仪器 - TI /
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23页 900K
描述
2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET

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TPS542951 数据手册

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TPS542951  
www.ti.com  
SLVSBI4 –JULY 2012  
2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET  
Check for Samples: TPS542951  
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 TPS542951 is a dual, adaptive on-time D-  
CAP2™ mode synchronous buck converter. The  
TPS542951 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 TPS542951 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 TPS542951 to maintain high efficiency  
during lighter load conditions. The TPS542951 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.  
–
150 mΩ (High Side) and 100 mΩ (Low Side)  
•
•
High Initial Reference Accuracy  
Supports Constant 2 A CH1 and 3 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 TPS542951 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  
V
2 = 1.5 V (50  
O
1
VIN2  
VIN1  
16  
15  
2
3
VBST1  
VBST2  
C12  
C11  
VO1  
C32  
C31  
L12  
L11  
VO2  
SW2 14  
SW1  
C22  
C21  
4
5
PGND1  
EN1  
PGND213  
EN2 12  
TPS542951  
HTSSOP16  
Iout (2 A/div)  
PGND  
PGND  
SS1  
6
SS2 11  
(PowerPAD)  
R11  
R21  
SGND  
SGND  
R12  
R22  
VFB1  
GND  
10  
VFB2  
7
8
C4  
9
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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TPS54295PWPR TI

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 		4.5V 至 18V 输入、双路 2A 输出、同步降压转换器，具有可调节软启动 | RSA
TPS542A50 TI

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 		具有 I2C 接口的 4V 至 18V 输入、电压模式、15A 同步 SWIFT™ 降压转
TPS542A50RJMR TI

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