Datasheet > RT7273

RT7273

更新时间： 2024-02-15 23:26:33

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
23页	342K
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RT7273 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	3
Vout (min) (V)：	0.8	Vout (max) (V)：	17
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	2.5;2.5;3.5	Current Limit (typ) (A)：	4;4;5
Freq (typ) (kHz)：	500	Freq (min) (kHz)：	300
Freq (max) (kHz)：	2200	Ext Sync：	Yes
Ron_HS (typ) (mOhm)：	95	Ron_LS (typ) (mOhm)：	50
Iq (typ) (mA)：	20	Features：	Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;Internal Compensation;Power Good;Stable with Ceramic Capacitor;UVP
Package Type：	WQFN6x6-40	Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS7273-04.pdf

RT7273 数据手册

RT7273

3-CH, 18V, Synchronous Step-Down Converter

General Description

The RT7273 features three synchronous wide input range

high efficiency Buck converters. The converters are

designed to simplify its application while giving the designer

the option to optimize their usage according to the target

application.

The RT7273 also features a low power mode enabled by

an external signal, which allows for a reduction on the

input power supplied to the system when the host

processor is in stand-by (low activity) mode.

Features

The converters can operate in 5V, 9V or 12V systems

and have integrated power transistors. The output voltage

can be set externally using a resistor divider to any value

between 0.8V and the input supply minus 1V. Each

converter features an enable pin that allows a delayed

start-up for sequencing purposes, a soft-start pin that

allows adjustable soft-start time by choosing the soft-

start capacitor, and a current limit pin (RLIMx) to adjust

current limit by selecting an external resistor. The COMP

pin allows optimizing transient versus dc accuracy

response with a simple RC compensation.

^Wide Input Supply Voltage Range : 4.5V to 18V

^Output Range : 0.8V to (VIN − 1V)

^Fully Integrated Triple-Buck

 Maximum Current 3.5A/2.5A/2.5A

 Continuous Operation 3A/2A/2A

^High Efficiency

 Switching Frequency

 300kHz to 2.2MHz Set by External Resistor

 External Synchronization Pin for Oscillator

 External Enable/Sequencing Pins

 Adjustable Cycle-By-Cycle Current Limit Set by

External Resistor

The switching frequency of the converters can either be

set with an external resistor connected to ROSC pin or

be synchronized to an external clock connected to SYNC

pin if needed. The switching converters are designed to

operate from 300kHz to 2.2MHz. The converters operate

with 180° phase between CH 1 and CH 2, CH 3 (CH 2 and

CH 3 ran in phase) to minimize the input filter requirements.

 Soft-Start

 Current Mode Control with Simple Compensation

Circuit

 Power Good Indicator

 Discontinuous Operating Mode at Light Load when

LOWP = High

 RoHS Compliant and Halogen Free

Simplified Application Circuit

VINx

LX1

OUT1

OUT2

OUT3

VINR

RT7273

FB1

LX2

FB2

ENx

SYNC

PGOOD

LOWP

SSx

RLIMx

ROSC

LX3

FB3

GND

is a registered trademark of Richtek Technology Corporation.

DS7273-04 October 2014

www.richtek.com

12 3 4 5 6 7...23

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与RT7273相关器件

型号	品牌	描述	获取价格	数据表
RT7273-04	RICHTEK	3-CH, 18V, Synchronous Step-Down Converter	获取价格
RT7274	RICHTEK	2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter	获取价格
RT7275	RICHTEK	3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter	获取价格
RT7276	RICHTEK	3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter	获取价格
RT7277	RICHTEK	3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter	获取价格
RT7278	RICHTEK	3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter	获取价格

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