Datasheet > BuckConv> RT7277

RT7277

更新时间： 2024-09-17 12:23:35

品牌	Logo	应用领域
立锜 - RICHTEK		转换器 TI的电源Demo板
页数	文件大小	规格书
14页	311K
描述
3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter

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技术参数
数据手册

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RT7277 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	1
Vout (min) (V)：	0.765	Vout (max) (V)：	8
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	3	Current Limit (typ) (A)：	4.1
Freq (typ) (kHz)：	700	Freq (min) (kHz)：
Freq (max) (kHz)：		Ext Sync：	No
Ron_HS (typ) (mOhm)：	90	Ron_LS (typ) (mOhm)：	60
Iq (typ) (mA)：	0.7	Features：	ACOT Control;Adjustable Soft-Start;Enable Input;Fast Transient Response;Force PWM;OCP;Stable with Ceramic Capacitor
Package Type：	PSOP-8

RT7277 数据手册

RT7277

3A, 18V, 700kHz ACOT^TMSynchronous Step-Down Converter

General Description

Features

^zACOT^TMMode Enables Fast Transient Response

^z4.5V to 18V Input Voltage Range

^z3A Output Current

The RT7277 is a synchronous step-downDC/DC converter

withAdvanced Constant On-Time (ACOT^TM) mode control.

It achieves high power density to deliver up to 3A output

current from a 4.5V to 18V input supply. The proprietary

ACOT^TMmode offers an optimal transient response over a

wide range of loads and all kinds of ceramic capacitors,

which allows the device to adopt very low ESR output

capacitors for ensuring performance stabilization. In

addition, RT7277 keeps an excellent constant switching

frequency under line and load variation and the integrated

synchronous power switches with the ACOT^TMmode

operation provides high efficiency in whole output current

load range. Cycle-by-cycle current limit provides an

accurate protection by a valley detection of low side

MOSFET and external soft-start setting eliminates input

current surge during startup. Protection functions also

include output under voltage protection, output over voltage

protection, and thermal shutdown.

^z60mΩ Internal Low Site N-MOSFET

^zAdvanced Constant On-Time Control

^zSupport All Ceramic Capacitors

^zUp to 95% Efficiency

^z700kHz Switching Frequency

^zAdjustable Output Voltage from 0.765V to 8V

^zAdjustable Soft-Start

^zCycle-by-Cycle Current Limit

^zInput Under Voltage Lockout

z Thermal Shutdown

z RoHS Compliant and Halogen Free

Applications

z Industrial and Commercial Low Power Systems

z Computer Peripherals

z LCDMonitors and TVs

z Green Electronics/Appliances

z Point of Load Regulation for High-Performance DSPs,

FPGAs, and ASICs

Marking Information

RT7277GSP : Product Number

RT7277

YMDNN : Date Code

GSPYMDNN

Simplified Application Circuit

RT7277

VIN

OUT

C3 R1

BOOT

Chip Enable

PVCC

GND

is a registered trademark of Richtek Technology Corporation.

DS7277-00 October 2012

www.richtek.com

12 3 4 5 6 7...14

中文翻译

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与RT7277相关器件

型号	品牌	获取价格	描述	数据表
RT7278	RICHTEK	获取价格	3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
RT7279	RICHTEK	获取价格	2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
RT7280	RICHTEK	获取价格	2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
RT7281	RICHTEK	获取价格	2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
RT7285	RICHTEK	获取价格	暂无描述
RT7285A	RICHTEK	获取价格	暂无描述
RT7285B	RICHTEK	获取价格	暂无描述
RT7285C	RICHTEK	获取价格	暂无描述
RT7285D	RICHTEK	获取价格	暂无描述
RT7290A	RICHTEK	获取价格	暂无描述

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