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TPS51123A

更新时间： 2024-09-29 12:47:11

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
36页	1205K
描述
Dual-Synchronous, Step-Down Controller with Out-of-Audioâ¢ Operation and 100-mA LDOs for Notebook System Power

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TPS51123A 数据手册

TPS51123A

www.ti.com

SLUSAA6B –APRIL 2011–REVISED MARCH 2012

Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA

LDOs for Notebook System Power

Check for Samples: TPS51123A

FEATURES

APPLICATIONS

•

Wide-Input Voltage Range: 5.5 V to 28 V

Output Voltage Range: 2 V to 5.5 V

Built-in 100-mA 5-V/3.3-V LDO with Switches

Built-in 1% 2-V Reference Output

•

Notebook Computers

I/O Supplies

•

System Power Supplies

DESCRIPTION

With/Without Out-of-Audio™ Mode Selectable

Light-Load and PWM-Only Operation

The TPS51123A is a cost effective, dual-synchronous

buck controller targeted for notebook system power

supply solutions. It provides 5-V and 3.3-V LDOs and

requires few external components. The TPS51123A

supports high-efficiency, fast transient responses and

provides a combined power-good signal. Out-of-

Audio™ mode light-load operation enables low

acoustic noise at much higher efficiency than

conventional forced PWM operation. Adaptive on-

time D-CAP™ control provides convenient and

efficient operation. The part operates with supply

input voltages ranging from 5.5 V to 28 V and

supports output voltages from 2 V to 5.5 V. The

TPS51123A is available in a 24-pin QFN package

and is specified from -40°C to 85°C ambient

temperature range.

•

Internal 1.6-ms Voltage Servo Soft-Start

Adaptive On-Time Control Architecture with

Four Selectable Frequency Setting

•

4500 ppm/°C R_DS(on)Current Sensing

Built-In Output Discharge

Power Good Output

Built-in OVP/UVP/OCP

Thermal Shutdown (Non-latch)

24-Pin QFN (RGE) Package

Table 1. Differences Between the TPS51123 and TPS51123A

TPS51123

TPS51123A

VREG5: at least 33 µF

VREG5: 10 µF or larger (X5R or X7R)

VREG3: at most 10 µF

(1 µF acceptable at no load)

VREG3: 10 µF or larger (X5R or X7R)

(1 µF acceptable at no load)

LDO Output Capacitance Requirement

VREF: 0.22 µF to 1 µF

VREF: 0.22 µF to 1 µF (X5R or X7R)

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.

Out-of-Audio, D-CAP 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.

12 3 4 5 6 7...36

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与TPS51123A相关器件

型号	品牌	获取价格	描述	数据表
TPS51123ARGER	TI	获取价格	Dual-Synchronous, Step-Down Controller with O
TPS51123ARGET	TI	获取价格	Dual-Synchronous, Step-Down Controller with O
TPS51123RGER	TI	获取价格	Dual-Synchronous, Step-Down Controller with O
TPS51123RGET	TI	获取价格	Dual-Synchronous, Step-Down Controller with O
TPS51124	TI	获取价格	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS51124RGER	TI	获取价格	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS51124RGERG4	TI	获取价格	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS51124RGET	TI	获取价格	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS51124RGETG4	TI	获取价格	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS51125	TI	获取价格	Dual-Synchronous, Step-Down Controller with O

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