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RT7257B PDF预览

RT7257B

更新时间: 2024-01-25 17:43:41
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 284K
描述
3A, 18V, 1.2MHz Synchronous Step-Down Converter

RT7257B 技术参数

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

RT7257B 数据手册

 浏览型号RT7257B的Datasheet PDF文件第2页浏览型号RT7257B的Datasheet PDF文件第3页浏览型号RT7257B的Datasheet PDF文件第4页浏览型号RT7257B的Datasheet PDF文件第5页浏览型号RT7257B的Datasheet PDF文件第6页浏览型号RT7257B的Datasheet PDF文件第7页 
®
RT7257B  
3A, 18V, 1.2MHz Synchronous Step-Down Converter  
General Description  
Features  
1.5% High Accuracy Reference Voltage  
The RT7257B is 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  
RT7257B'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 RT7257B 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 RT7257B 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  
Up to 95% Efficiency  
Programmable Soft-Start  
Stable with Low ESR Ceramic Output Capacitors  
Cycle-by-Cycle Over Current Protection  
Input Under Voltage Lockout  
Output Under Voltage Protection  
Thermal Shutdown Protection  
RoHS Compliant and Halogen Free  
Ordering Information  
RT7257B  
Applications  
Wireless AP/Router  
Package Type  
SP : SOP-8 (Exposed Pad-Option 1)  
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.  
8
BOOT  
VIN  
SS  
` Suitable for use in SnPb or Pb-free soldering processes.  
2
3
4
7
6
5
EN  
GND  
SW  
COMP  
FB  
9
GND  
Marking Information  
RT7257BxZSP : Product Number  
SOP-8 (Exposed Pad)  
RT7257Bx  
ZSPYMDNN  
x : H or L  
YMDNN : Date Code  
Copyright 2012 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS7257B-03 September 2012  
www.richtek.com  
1

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