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RT4832A

更新时间： 2024-02-24 11:06:43
品牌 Logo 应用领域
立锜 - RICHTEK 集成电源管理电路
页数 文件大小 规格书
26页 1666K
描述
Sub PMIC with Dual-Output Boost Converter

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中文翻译

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RT4832A 技术参数

Status：ActiveVin (min) (V)：2.5
Vin (max) (V)：5.5Number of Channels：3
Number of Buck Converters：0Number of Boost Converters：3
Number of Negative Outputs：1Number of LED Drivers：1
Number of LDO Regulators：1Features：Enable Input;OCP;OVP;SCP
Package Type：WL-CSP2.24x2.64-30(BSC)

RT4832A 数据手册

 浏览型号RT4832A的Datasheet PDF文件第17页浏览型号RT4832A的Datasheet PDF文件第18页浏览型号RT4832A的Datasheet PDF文件第19页浏览型号RT4832A的Datasheet PDF文件第21页浏览型号RT4832A的Datasheet PDF文件第22页浏览型号RT4832A的Datasheet PDF文件第23页 
RT4832A  
11 bit LED Current vs. Exponential  
Brightness Code  
11 bit LED Current vs. Linearty  
Brightness Code  
0.025  
0.020  
0.015  
0.010  
0.005  
0.000  
0.025  
0.020  
0.015  
0.010  
0.005  
0.000  
0
256 512 768 1024 1280 1536 1792 2048  
Brightness Code (LSB)  
0
256 512 768 1024 1280 1536 1792 2048  
Brightness Code (LSB)  
Figure 4. LED Current vs Brightness Code  
LEDs for camera flash applications. It adopts two  
Ramp Rate  
channels to provide accurately regulated current flow  
through two separate white LEDs.  
There are 16 programmable ramp rates available in the  
RT4832A. These ramp rates are programmable as a  
time. Therefore, the ramp time from one current  
set-point to the next, depends on the register 0x03[6:3].  
The RT4832A FLED can be set in Flash or Torch mode  
by the register and the STRB pin. Figure 5 shows the  
RT4832A FLED operation and Table 6 contains the  
FLED operation control table.  
Over-Voltage Protection (Open LED, Open Circuit)  
The RT4832A provides an internal over voltage  
protection to limit its output voltage. The OVP function  
prevents the RT4832A from damaging while open LED  
or open circuit condition occurs. Once the open circuit  
condition is removed, and the RT4832A will return to  
normal operation.  
Flash Mode  
In Flash Mode, FLED provides 15 different current  
levels from 100mA to 1500mA in step of 100mA. The  
flash currents are adjusted via the register 0x06[3:0] for  
flash brightness. RT4832A provides 32 steps timeout  
from 32ms to 1024ms in step of 32ms for flash mode  
only. The Flash mode can be set via the register  
0x0A[1] = 1 and 0x0A[2] = 1.  
Over-Current Protection  
The RT4832A features a 1.2A OCP. The driver  
provides cycle-by-cycle current limit function to control  
the current on power switch. The boost switch turns off  
when the inductor current reaches this current  
threshold and it remains off until the beginning of the  
next switching cycle. This protects the RT4832A and  
external component under overload conditions.  
Timeout  
To avoid the thermal increase from flash current,  
RT4832A provides 32 steps timeout from 32ms to  
1024ms in step of 32ms for flash mode only. The  
timeout can be set via the register 0x07[4:0]. Once a  
flash event is completed, the Flash Timeout flag in  
register 0x0B bit [1] is set. This is a status only flag so  
the Flash Enable bit is not cleared. If a Flash event is  
activated via the STROBE pin and STROBE transitions  
low after the end of the programmed flash timeout, the  
Flash event is terminated at the programmed Flash  
Flash LED  
The RT4832A FLED provides a current regulated  
output to drive high current white LEDs for camera  
flash applications. The output current provides up to  
375mA for torch and 1.5A for strobe per channel white  
Copyright © 2017 Richtek Technology Corporation. All rights reserved.  
is a registered trademark of Richtek Technology Corporation.  
www.richtek.com  
20  
DS4832A-00 January 2017  
1...17181920212223...26

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