Datasheet > BuckConv> RT7257D

RT7257D

更新时间： 2024-01-06 13:26:36

品牌	Logo	应用领域
立锜 - RICHTEK		转换器
页数	文件大小	规格书
14页	224K
描述
3A, 18V, 1.2MHz Synchronous Step-Down Converter

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技术参数
数据手册

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RT7257D 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	1
Vout (min) (V)：	0.8	Vout (max) (V)：	15
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	3	Current Limit (typ) (A)：	5.1
Freq (typ) (kHz)：	340	Freq (min) (kHz)：
Freq (max) (kHz)：		Ext Sync：	No
Ron_HS (typ) (mOhm)：	110	Ron_LS (typ) (mOhm)：	90
Iq (typ) (mA)：	0.8	Features：	Adjustable Soft-Start;Current Mode Control;Enable Input;OCP;PSM;Stable with Ceramic Capacitor;UVP
Package Type：	PSOP-8

RT7257D 数据手册

RT7257D

3A, 18V, 1.2MHz Synchronous Step-Down Converter

General Description

Features

ꢀ

1.5% High Accuracy Reference Voltage

The RT7257Dis a high efficiency, monolithic synchronous

step-down DC/DC converter that can deliver up to 3A

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

RT7257D's current mode architecture and external

compensation allow the transient response to be

optimized over a wide input voltage range and loads.

Cycle-by-cycle current limit provides protection against

shorted outputs, and soft-start eliminates input current

surge during start-up. The RT7257D also provides under

voltage protection and thermal shutdown protection. The

low current (<3μA) shutdown mode provides output

disconnection, enabling easy power management in

battery-powered systems. The RT7257D is available in

an SOP-8 (Exposed Pad) package.

^ꢀ4.5V to 18V Input Voltage Range

^ꢀ3A Output Current

^ꢀIntegrated N-MOSFET Switches

^ꢀCurrent Mode Control

^ꢀFixed Frequency Operation : 1.2MHz

^ꢀOutput Adjustable from 0.8V to 12V

^ꢀPin-Short Matrix Feature

^ꢀUp to 95% Efficiency

^ꢀProgrammable Soft-Start

^ꢀCycle-by-Cycle Over Current Protection

^ꢀInput Under Voltage Lockout

ꢀ Output Under Voltage Protection

ꢀ Thermal Shutdown Protection

ꢀ RoHS Compliant and Halogen Free

Ordering Information

RT7257D

Applications

ꢀ Wireless AP/Router

Package Type

SP : SOP-8 (Exposed Pad-Option 2)

ꢀ Set-Top-Box

ꢀ Industrial and Commercial Low Power Systems

ꢀ LCDMonitors and TVs

Lead Plating System

Z : ECO (Ecological Element with

Halogen Free and Pb free)

ꢀ Green Electronics/Appliances

ꢀ Point of Load Regulation of High-PerformanceDSPs

H : UVP Hiccup

L : UVP Latch-Off

Note :

Pin Configurations

Richtek products are :

(TOP VIEW)

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

BOOT

VIN

GND

COMP

GND

Marking Information

RT7257DxZSP : Product Number

SOP-8 (Exposed Pad)

RT7257Dx

x : H or L

ZSPYMDNN

YMDNN : Date Code

is a registered trademark of Richtek Technology Corporation.

DS7257D-04 September 2012

www.richtek.com

12 3 4 5 6 7...14

中文翻译

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与RT7257D相关器件

型号	品牌	获取价格	描述	数据表
RT7257DHZSP	RICHTEK	获取价格	IC REG BUCK ADJ 3A SYNC 8SOP
RT7257DLZSP	RICHTEK	获取价格	IC REG BUCK ADJ 3A SYNC 8SOP
RT7257E	RICHTEK	获取价格	3A, 17V, 340kHz Synchronous Step-Down Converter
RT7257EN	RICHTEK	获取价格	3A, 17V, 340kHz Synchronous Step-Down Converter
RT7257ENZ	RICHTEK	获取价格	3A, 17V, 340kHz Synchronous Step-Down Converter
RT7257G	RICHTEK	获取价格	3A, 18V, 800kHz Synchronous Step-Down Converter
RT7257J	RICHTEK	获取价格	3A, 18V, 340kHz Synchronous Step-Down Converter
RT7258	RICHTEK	获取价格	8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver
RT7258GQW	RICHTEK	获取价格	IC REG BUCK ADJ 8A 14WDFN
RT7259	RICHTEK	获取价格	10A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver

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