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RT7236

更新时间： 2024-11-12 12:25:07
品牌 Logo 应用领域
立锜 - RICHTEK 转换器
页数 文件大小 规格书
18页 302K
描述
5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter

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RT7236 技术参数

Status：ActiveVin (min) (V)：4.5
Vin (max) (V)：18Number of Outputs：1
Vout (min) (V)：0.765Vout (max) (V)：8
Preset Vout (V)：Output Adj. Method：Resistor
Iout (max) (A)：5Current Limit (typ) (A)：6.85
Freq (typ) (kHz)：650Freq (min) (kHz)：
Freq (max) (kHz)：Ext Sync：No
Ron_HS (typ) (mOhm)：120Ron_LS (typ) (mOhm)：35
Iq (typ) (mA)：1Features：ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP
Package Type：TSSOP-14(PP);WDFN3x3-10

RT7236 数据手册

 浏览型号RT7236的Datasheet PDF文件第2页浏览型号RT7236的Datasheet PDF文件第3页浏览型号RT7236的Datasheet PDF文件第4页浏览型号RT7236的Datasheet PDF文件第5页浏览型号RT7236的Datasheet PDF文件第6页浏览型号RT7236的Datasheet PDF文件第7页 
®
RT7235/36/39/40  
5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter  
General Description  
Features  
z ACOTTM Mode Enables Fast Transient Response  
z 4.5V to 18V Input Voltage Range  
z 5A Output Current  
The RT7235/36/39/40 is a synchronous step-down DC/  
DC converter withAdvanced Constant On-Time (ACOTTM)  
mode control. It achieves high power density to deliver up  
to 5Aoutput current from a 4.5V to 18V input supply. The  
proprietary ACOTTM mode 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 capacitor for ensuring performance stabilization. In  
addition, RT7235/36/39/40 keeps an excellent constant  
switching frequency under line and load variation and the  
integrated synchronous power switches with theACOTTM  
mode 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 include  
thermal shutdown for RT7235/36/39/40, output Under  
Voltage Protection (UVP) / Over Voltage Protection (OVP)  
for RT7235/36. When the UVP/OVP is triggered, the device  
will enter latch mode for TSSOP-14 (Exposed Pad), and  
hiccup mode for WDFN-10L 3x3.  
z 35mΩ Internal Low Site N-MOSFET  
z Advanced Constant On-Time Control  
z Support All Ceramic Capacitors  
z Up to 95% Efficiency  
z 650kHz Switching Frequency at all Load Current  
(RT7235, RT7239)  
z Discontinuous Operating Mode at Light Load  
(RT7236, RT7240)  
z Adjustable Output Voltage from 0.765V to 8V  
z Adjustable Soft-Start  
z Cycle-by-Cycle Current Limit  
z Input 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  
The RT7235/36 are available in TSSOP-14 (Exposed Pad)  
and WDFN-10L 3x3 packages, and the RT7235 is operated  
in forced continuous conduction mode.  
z Green Electronics/Appliances  
z Point of Load Regulation for High-Performance DSPs,  
FPGAs, and ASICs  
The RT7239/40 are available in the SOP-8 (Exposed Pad)  
package, and the RT7239 is operated in forced continuous  
conduction mode.  
Simplified Application Circuit  
RT7235/36/39/40  
VIN  
V
OUT  
V
IN  
SW  
VCC*  
EN  
BOOT  
FB  
Enable  
PGOOD*  
Power GOOD  
PGND  
VREG5  
SS  
VS*  
* : VCC pin for TSSOP-14 (Exposed Pad) only.  
VS pin for TSSOP-14 (Exposed Pad) only.  
GND pin for TSSOP-14 (Exposed Pad) only.  
GND*  
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.  
Copyright 2013 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS7235/36/39/40-00 March 2013  
www.richtek.com  
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