Datasheet > RT7255A

RT7255A

更新时间： 2024-02-17 21:09:21

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
17页	1292K
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RT7255A 技术参数

Status：	Preview	Vin (min) (V)：	4.3
Vin (max) (V)：	18	Number of Outputs：	1
Vout (min) (V)：	0.6	Vout (max) (V)：	8
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	1.5	Current Limit (typ) (A)：	2.2
Freq (typ) (kHz)：	500	Freq (min) (kHz)：
Freq (max) (kHz)：		Ext Sync：	No
Ron_HS (typ) (mOhm)：	230	Ron_LS (typ) (mOhm)：	130
Iq (typ) (mA)：	0.5	Features：	ACOT Control;Adjustable Soft-Start;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Fast Transient Response;Force PWM;Stable with Ceramic Capacitor;UVP
Package Type：	TSOT-28	Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS7255-01.pdf

RT7255A 数据手册

RT7255

18V, 1.5A, 500kHz ACOT^TMStep-down Converter in 8 Pin TSOT-23

General Description

Features

 1.5A Converter With Built-In 230m/130m Low

The RT7255 is

simple, easy-to-use, 1.5A

R_DS(ON)Power FETs

synchronous step-down DC-DC converter with an input

supply voltage range of 4.3V to 18V. The device

build-in an accurate 0.6V reference voltage and

integrates low R_DS(ON)power MOSFETs to achieve

high efficiency in a TSOT-23-8 package.

 Input Supply Voltage Range : 4.3V to 18V

 Output Voltage Range : 0.6 to 8V

 Advanced Constant On-Time (ACOT^TM) Control

 Ultrafast Transient Response

 No Needs For External Compensations

 Optimized for Low-ESR Ceramic Output

Capacitors

The RT7255 adopts Advanced Constant On-Time

(ACOT^TM) control architecture to provide an ultrafast

transient response with few external components and

to operate in nearly constant switching frequency over

the line, load, and output voltage range. The RT7255A

operates in automatic PSM that maintains high

efficiency during light load operation. The RT7255C

operates in Forced PWM that helps meet tight voltage

regulation accuracy requirements.

 0.6V 1.5% High-Accuracy Feedback Reference

Voltage

 Low Quiescent Current (500A typ.)

 Optional for Operation Modes :

 Power Saving Mode (PSM) at Light Load

(RT7255A)

 Forced PWM Mode (RT7255C)

The RT7255 senses low-side FETs current for a robust

over-current protection. It features cycle-by-cycle

current limit protection and prevent the device from the

catastrophic damage in output short circuit, over

current or inductor saturation. An externally adjustable

soft-start function prevents inrush current during

start-up. The device also includes input under-voltage

lockout, output under-voltage protection, and

over-temperature protection (thermal shutdown) to

provide safe and smooth operation in all operating

conditions. The RT7255 is offered in a TSOT-23-8

package.

 Light-load V_OUTRipple Reduction Technology in

PSM

 Fixed Switching Frequency : 500kHz

 Externally Adjustable Soft-Start

 Monotonic Start-Up for Pre-Biased Output

 Input Under-Voltage Lockout (UVLO)

 Output Under-Voltage Protection (UVP) with

Hiccup Mode

 Power Good Indication

 Enable Control

 Available In TSOT-23-8 Package

Simplified Application Circuit

RT7255

OUT

VIN

BOOT

OUT

PGOOD

Enable

GND

is a registered trademark of Richtek Technology Corporation.

DS7255-01 November 2017

www.richtek.com

12 3 4 5 6 7...17

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与RT7255A相关器件

型号	品牌	描述	获取价格	数据表
RT7255AGV8	RICHTEK	IC REG BUCK ADJ 1.5A SYNC SOT23-	获取价格
RT7255C	RICHTEK	暂无描述	获取价格
RT7255CGV8	RICHTEK	IC REG BUCK ADJ 1.5A SYNC SOT23-	获取价格
RT7255DGV8	RICHTEK	IC REG BUCK ADJ 1.5A SYNC 8TSOT	获取价格
RT7256A	RICHTEK	暂无描述	获取价格
RT7256B	RICHTEK	3A, 17V, 1.2MHz Synchronous Step-Down Converter	获取价格

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