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TPS56921PWP

更新时间： 2024-11-29 12:00:35
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德州仪器 - TI 转换器
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39页 1639K
描述
4.5V to 17V Input, 9A Synchronous Step Down SWIFT Converter With VID Control

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TPS56921  
www.ti.com  
SLVSBL4 –OCTOBER 2012  
4.5V to 17V Input, 9A Synchronous Step Down SWIFT™ Converter With VID Control  
Check for Samples: TPS56921  
1
FEATURES  
•
Overcurrent Protection for Both MOSFETs  
with Hiccup Mode for Severe Fault Conditions  
•
VID Control Range via I2C Compatible  
Interface: 0.72V to 1.48V in 10mV Steps  
•
•
•
Thermal and Overvoltage Protection  
Adjustable Soft Start  
•
•
I2C Addressing Flexibility: 2 Bits by IC pins  
Power Good Monitor for Under- and Over-  
Voltage Conditions  
±1.5% Output Voltage over Temperature for  
VID Control  
•
•
Operating Junction Temperature Range: –40°C  
to 125°C  
•
±1% Reference Voltage over Temperature for  
External Regulation Mode  
Available in 20-Pin HTSSOP Package with  
PowerPADTM  
•
•
•
Integrated 26mΩ / 19mΩ MOSFETs  
Power Input PVIN Voltage Range: 1.6V to 17V  
Switching Frequency: 200kHz to 1.6MHz  
Internal Oscillator or Synchronizing to  
External Clock  
APPLICATIONS  
•
•
•
•
Digital TVs  
Set Top Boxes  
•
•
Shutdown Current: 2µA  
SoC Power  
Monotonic Start-Up into Pre-biased Output  
Voltage  
High Density Power Distribution Systems  
DESCRIPTION  
The TPS56921 in thermally enhanced 20-pin HTSSOP package is a full featured 17V, 9A synchronous step  
down converter which is optimized for small designs through high efficiency and integrating the high-side and  
low-side MOSFETs. After the initial power-up, the output voltage can be changed by codes sent to the IC via an  
I2C compatible VID Control bus. Current mode control provides space savings and easy compensation.  
The output voltage startup ramp is controlled by the SS pin which helps to control startup inrush current. Power  
sequencing is supported by configuring the enable and the open drain power good pins. The output voltage is  
user-configurable at startup by external voltage divider.  
Cycle by cycle current limiting on the high-side fet protects the TPS56921 in overload situations and is enhanced  
by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit  
which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if  
the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the  
part when die temperature exceeds thermal shutdown temperature and enables the part again after the built-in  
thermal hiccup time.  
SIMPLIFIED SCHEMATIC  
EFFICIENCY  
Fsw = 500 kHz, VOUT= 1.1 V  
PWRGD  
PVIN  
VIN  
VIN  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
Cboot  
Cin  
EN  
BOOT  
PH  
VOUT  
Lo  
VDD  
VIN = 5 V  
Rp2 Rp1  
VIN = 12 V  
SDA  
SDA  
Co  
R1  
SCL  
ADDR1  
ADDR0  
SCL  
A1  
VOUT  
A0  
VSENSE  
SS  
RT/CLK  
COMP  
R2  
GND  
0
1
2
3
4
5
6
7
8
9
R3  
C1  
PowerPAD  
Css  
Rrt  
C007  
Output Current - A  
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.  
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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TPS56921PWP 替代型号

型号 品牌 替代类型 描述 数据表
TPS56921PWPR TI

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