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TPS51124

更新时间： 2024-09-30 08:39:03
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
22页 1224K
描述
DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS

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TPS51124 数据手册

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TPS51124  
www.ti.com  
SLVS616A–NOVEMBER 2005–REVISED NOVEMBER 2005  
DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR  
LOW VOLTAGE POWER RAILS  
FEATURES  
DESCRIPTION  
•
•
•
High Efficiency, Low-Power Consumption,  
Shutdowns to <1 µA  
The TPS51124 is a dual, adaptive on-time D-CAP™  
mode synchronous buck controller. The part enables  
system designers to cost effectively complete the  
suite of notebook power bus regulators with the  
absolute lowest external component count and lowest  
standby consumption. The fixed frequency emulated  
adaptive on-time control supports seamless operation  
between PWM mode at heavy load condition and  
reduced frequency operation at light load for high  
efficiency down to milliampere range. The main  
control loop for the TPS51124 uses the D-CAP mode  
that optimized for low ESR output capacitors such as  
POSCAP or SP-CAP promises fast transient  
response with no external compensation. Simple and  
separate power good signals for each channel allow  
flexibility of power sequencing. The part provides a  
convenient and efficient operation with supply input  
voltages (V5IN, V5FILT) ranging from 4.5 V to 5.5 V,  
conversion voltages (drain voltage for the  
synchronous high-side MOSFET) from 3 V to 28 V  
and output voltages from 0.76 V to 5.5 V.  
Fixed Frequency Emulated On-Time Control,  
Frequency Selectable From Three Options  
D-CAP™ Mode Enables Fast Transient  
Response  
•
•
•
•
•
•
•
Auto-Skip Mode  
Less Than 1% Initial Reference Accuracy  
Low Output Ripple  
Wide Input Voltage Range: 3 V to 28 V  
Output Voltage Range: 0.76 V to 5.5 V  
Low-Side RDS(ON) Loss-less Current Sensing  
Adaptive Gate Drivers With Integrated Boost  
Diode  
•
•
Internal 1.2-ms Voltage-Servo Soft Start  
Power-Good Signals for Each Channel With  
Delay Timer  
•
Output Discharge During Disable, Fault  
The TPS51124 is available in 24-pin QFN package  
specified from –40°C to 85°C ambient temperature  
range.  
APPLICATIONS  
•
Notebook I/O and Low Voltage System Bus  
Input Voltage  
3 V to 28 V  
R2  
75  
kΩ  
R5  
C9  
22 µF  
R4  
73.2 kΩ  
R1  
75 kΩ  
SGND  
28.7 kΩ  
6
5
4
3
2
1
SGND PGND  
Power  
Power  
PGOOD2  
24  
7
8
9
PGOOD1  
Good2  
Good1  
TM  
PowerPAD  
EN2  
EN2  
EN1 23  
VBST1 22  
DRVH1 21  
LL1 20  
EN1  
Q3  
C3  
C6  
Q1  
IRF7821  
VBST2  
C5  
TPS51124RGE  
(QFN24)  
IRF7821  
C2  
0.1 µF  
10 µF  
10 µF  
L1  
1 µH  
0.1 µF  
L2  
VO2  
1.5 V/10 A  
1 µH  
10 DRVH2  
VO1  
1.05 V/10 A  
11 LL2  
Q4  
Q2  
IRF8113  
IRF8113  
DRVL2  
DRVL1  
12  
19  
C4  
C1  
2 x 330 µF  
2 x 330 µF  
13 14 15 16 17 18  
R3  
R7  
6.8  
3.3Ω  
R6  
kΩ  
6.8 kΩ  
V5IN  
PGND  
PGND  
4.5 V to 5.5 V  
C8  
1 μF  
C7  
4.7 μF  
PGND  
SGND  
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.  
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 © 2005, Texas Instruments Incorporated  
1234567...22

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TPS51124 替代型号

型号 品牌 替代类型 描述 数据表
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