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RT8243B PDF预览

RT8243B

更新时间： 2024-09-24 01:05:23
品牌 Logo 应用领域
立锜 - RICHTEK /
页数 文件大小 规格书
24页 319K
描述
High Efficiency, Main Power Supply Controller for Notebook Computers

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RT8243B 技术参数

Status：ActiveVs (typ) (V)：19
Vin (min) (V)：5.5Vin (max) (V)：25
Vout (min) (V)：2Vout (max) (V)：5.5
Preset Vout (V)：Output Adj. Method：Resistor
Accuracy (+/- %)：1.2Freq (typ) (kHz)：300
Freq (min) (kHz)：200Freq (max) (kHz)：466
Iq (typ) (mA)：1Features：Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control
Package Type：WQFN3x3-20

RT8243B 数据手册

 浏览型号RT8243B的Datasheet PDF文件第2页浏览型号RT8243B的Datasheet PDF文件第3页浏览型号RT8243B的Datasheet PDF文件第4页浏览型号RT8243B的Datasheet PDF文件第5页浏览型号RT8243B的Datasheet PDF文件第6页浏览型号RT8243B的Datasheet PDF文件第7页 
®
RT8243A/B/C  
High Efficiency, Main Power Supply Controller  
for Notebook Computers  
General Description  
Features  
5.5V to 25V Input Voltage Range  
2V to 5.5V Output Voltage Range  
No Current Sense Resistor Needed  
5V/3.3V Linear Regulators  
The RT8243A/B/C is a dual step down, Switch Mode Power  
Supply (SMPS) controller which generates logic supply  
voltages for battery powered systems. It includes two  
Pulse Width Modulation (PWM) controllers adjustable  
from 2V to 5.5V and also two fixed 5V/3.3V linear  
regulators. One of the controllers (LDO5) provides  
automatic switch over to the BYP1 input connected to  
the main SMPS1 output for maximized efficiency. An  
optional external charge pump can be monitored through  
SECFB (RT8243B/C). Other features include on board  
power up sequencing, a power good output, internal soft-  
start, and a soft discharge output that prevents negative  
voltage during shutdown.  
4700ppm/°C RDS(ON) Current Sensing  
Internal Current Limit Soft-Start and Soft Discharge  
Output  
Built In OVP/UVP/OCP  
Selectable Operation Mode with Switcher Enable  
Control (RT8243A)  
SECFB Input Maintains Charge Pump Voltage  
(RT8243B/C)  
Power Good Indicator (RT8243B/C includes SECFB)  
RoHS Compliant and Halogen Free  
Aconstant on-time PWM control scheme operates without  
sense resistors and assures fast load transient response  
while maintaining nearly constant switching frequency. To  
eliminate noise in audio applications, an ultrasonic mode  
is included, which maintains the switching frequency  
above 25kHz. Moreover, a diode emulation mode  
maximizes efficiency for light load applications. The  
SMPS1/SMPS2 switching frequency can be adjustable  
from 200kHz/233kHz to 400kHz/466kHz respectively.  
Applications  
Notebook computers  
System Power Supplies  
3- and 4- Cell Li+ Battery-PoweredDevice  
Ordering Information  
RT8243A/B/C  
The RT8243A/B/C is available in a WQFN-20L 3x3  
package, and operates over an extended temperature range  
from −40°C to 85°C.  
Package Type  
QW : WQFN-20L 3x3 (W-Type)  
Lead Plating System  
Z : ECO (Ecological Element with  
Halogen Free and Pb free)  
Pin Function With  
A : ENM  
B : SECFB  
C : SECFB, Ultrasonic Mode  
Note :  
Richtek products are :  
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.  
Copyright 2014 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS8243A/B/C-07 November 2014  
www.richtek.com  
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