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TPS51220A

更新时间： 2024-11-23 07:04:47
品牌 Logo 应用领域
德州仪器 - TI 功率控制控制器
页数 文件大小 规格书
45页 839K
描述
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

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TPS51220A 数据手册

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TPS51220A  
www.ti.com ........................................................................................................................................................................................... SLUS897–DECEMBER 2008  
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller  
1
FEATURES  
2
•
•
•
Input Voltage Range: 4.5 V to 32 V  
•
•
Powergood Output for Each Channel  
Output Voltage Range: 1 V to 12 V  
OCL/OVP/UVP/UVLO Protections  
(OVP Disable Option)  
Selectable Light Load Operation  
(Continuous / Auto Skip / Out-Of-Audio™ Skip)  
•
•
•
•
Thermal Shutdown (Non-Latch)  
Output Discharge Function (Disable Option)  
Integrated Boot Strap MOSFET Switch  
QFN-32 (RTV) Package  
•
•
•
•
•
•
•
Programmable Droop Compensation  
Voltage Servo Adjustable Soft Start  
200-kHz to 1-MHz Fixed-Frequency PWM  
Selectable Current/D-CAP™ Mode Architecture  
180° Phase Shift Between Channels  
Resistor or Inductor DCR Current Sensing  
Adaptive Zero Crossing Circuit  
APPLICATIONS  
•
•
Notebook Computer System and I/O Bus  
Point of Load in LCD TV, MFP  
DESCRIPTION  
The TPS51220A is a dual synchronous buck regulator controller with two LDOs. It is optimized for 5-V/3.3-V  
system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply.  
The TPS51220A supports high efficiency, fast transient response, and 99% duty cycle operation. It supports  
supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Two types of control  
schemes can be chosen depending on the application. Peak current mode supports stability operation with lower  
ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (99%)  
operation and the wide input/output voltage range supports flexible design for small mobile PCs and a wide  
variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1 MHz by a resistor, and each  
channel runs 180° out-of-phase. The TPS51220A can also synchronize to the external clock, and the interleaving  
ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5x5 QFN package and is specified  
from –40°C to 85°C.  
TYPICAL APPLICATION CIRCUIT  
VREG5  
VBAT  
VBAT  
5V/100mA  
Q11  
Q12  
C12  
Q21  
C22  
C01  
C14  
C24  
L2  
L1  
PGND  
PGND  
VO2  
3.3V  
VO1  
5.0V  
PGND  
28  
PGND  
30  
C21  
GND  
27  
Q22  
C11  
32  
31  
29  
26  
25  
PGND  
PGND  
PGND  
PGND  
1
2
3
4
5
6
7
8
24  
23  
DRVH1  
V5SW  
DRVH2  
VIN  
VO1  
VBAT  
R01  
VREG3  
RF  
VREG3 22  
EN2 21  
3.3V/10mA  
C03  
GND EN1  
PGOOD1  
EN1  
EN2  
TPS51220A  
(QFN32)  
PGOOD1  
SKIPSEL1  
PGOOD2  
SKIPSEL2  
20  
19  
PGOOD2  
GND  
SKIPSEL1  
R14  
SKIPSEL2  
R24  
PowerPAD  
CSP1  
CSN1  
CSP2 18  
C13  
C23  
CSN2  
17  
9
10  
11  
12  
13  
14  
15  
16  
GND  
EN  
VO1  
VREG5  
VO2  
R21  
R23  
R11  
R12  
R22  
C 02  
R13  
GND  
GND  
GND  
GND  
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
Out-Of-Audio, D-CAP, PowerPAD 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 © 2008, Texas Instruments Incorporated  
1234567...45

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TPS51220A 替代型号

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