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TPS51285A

更新时间： 2024-11-26 12:02:43
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
32页 1375K
描述
Ultra-Low Quiescent (ULQ™) Dual Synchronous Step-Down Controller with 5V and 3.3V LDOs

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TPS51285A 数据手册

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TPS51285A  
TPS51285B  
www.ti.com  
SLVSBX0 –APRIL 2013  
Ultra-Low Quiescent (ULQ™) Dual Synchronous Step-Down Controller with  
5V and 3.3V LDOs  
Check for Samples: TPS51285A, TPS51285B  
1
FEATURES  
APPLICATIONS  
2
•
•
Input Voltage Range: 5 V to 24 V  
•
•
Notebook Computers  
Tablet Computers  
Output Voltages: 5 V and 3.3 V (Adjustable  
Range ±10%)  
DESCRIPTION  
•
•
•
•
Built-in, 100-mA, 5-V and 3.3-V LDOs  
Clock Output for Charge-Pump  
±1% Reference Accuracy  
The TPS51285A and TPS51285B are cost-effective,  
dual synchronous buck controllers with 5-V and 3.3-V  
LDOs, targeted for notebook system-power supply  
solutions. The device achieves low power  
consumption by the use of auto-skip and ULQ™  
modes, which is beneficial for long battery life in  
system stand-by mode. The 256-kHz VCLK output is  
provided to drive an external charge pump,  
generating gate drive voltage for the load switches  
with minimum power consumption in the main  
converter. The device employs adaptive on-time D-  
CAP™ mode control which enables fast load  
transient response without external compensation  
network. The TPS51285A/B operates with supply  
input voltage ranging from 5V to 24V and supports  
output voltages of 5 V and 3.3 V. The TPS51285A  
and TPS51285B are available in a 20-pin 3 x 3 (mm)  
QFN package and is specified from -40°C to 85°C.  
Adaptive On-Time D-CAP™ Mode Control  
Architecture with 400 kHz (CH1) and 475 kHz  
(CH2) Frequency  
•
Auto-skip and ULQ™ modes for long battery  
life in system stand-by mode  
•
•
•
•
•
•
•
•
•
Internal 0.8-ms Voltage Servo Soft-Start  
Low-Side RDS(on) Current Sensing Scheme  
Built-In Output Discharge Function  
Separate Enable Input for Switchers  
Dedicated OC Setting Terminals  
Power Good Indicator  
OVP, UVP and OCP Protection  
Non-Latch UVLO and OTP Protection  
20-Pin, 3 mm x 3 mm, QFN (RUK)  
NEED SOME SPACE  
ORDERING INFORMATION(1)  
ORDERABLE  
DEVICE NUMBER  
ALWAYS On-LDO  
OUTPUT SUPPLY  
QUANTITY  
TPS51285ARUKR  
TPS51285ARUKT  
TPS51285BRUKR  
TPS51285BRUKT  
Tape and Reel  
Mini reel  
3000  
250  
VREG3  
Tape and Reel  
Mini reel  
3000  
250  
VREG3 and VREG5  
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI  
website at www.ti.com.  
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-CAP, ULQ 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 © 2013, Texas Instruments Incorporated  
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TPS51285A 替代型号

型号 品牌 替代类型 描述 数据表
TPS51275B TI

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