Datasheet > RT8541

RT8541

更新时间： 2024-01-19 18:30:37

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
13页	159K
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技术参数
数据手册

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RT8541 技术参数

Status：	Active	Vin (min) (V)：	2.7
Vin (max) (V)：	16	Vout (min) (V)：
Vout (max) (V)：	90	Output Adj. Method：	Resistor
Iq (typ) (mA)：	3.3	SW Current Limit (typ) (A)：	0.4
Freq (typ) (kHz)：		Freq (min) (kHz)：	360.0
Freq (max) (kHz)：	1300.0	Ron (typ) (Ohm)：
Features：	Adjustable Current Limit;Enable Input;OCP;OVP;UVP	Package Type：	WQFN3x3-16

RT8541 数据手册

RT8541/A

90V Boost DC/DC Converter with APD Current Monitor

General Description

Features

^Integrated Schottky Diodes for Charge Pump

The RT8541/Ais a constant frequency current mode PWM

step-up DC/DC converter designed to bias avalanche

photodiodes (APD) at high voltage in optical receivers. It

includes a voltage doubler charge pump to significantly

reduce the noise level at output up to 90V. The RT8541A

switching frequency can be adjusted by a resistor while

RT8541 is internally set at 650kHz. The RT8541/A has a

built-in APD current mirror that delivers 1/5 of the APD

current with high accuracy for monitoring theAPDcurrent

from 0.25μA to 2.5mA. This current can be used as a

reference to provide a digital programmed output voltage

via the CTRL pin. To protect the optical receiver system,

the RT8541/A provides a built-in adjustable APD current

limit function by sensing a 200mV voltage threshold

between VOUT2 and MONIN pins. Only one resistor is

needed to program the desired current limit.Acharge pump

voltage doubler is designed to achieve significantly lower

noise level at the APD comparing to a simple boost

converter type bias circuit.

Voltage Doubler

^50V, 400mA Internal Switch

^High Side Low Noise and Accurate APD Current

Monitor

^650kHz Fixed Switching Frequency for RT8541 and

Adjustable Switching Frequency for RT8541A

^Wide VIN Range : 2.7V to 16V

^Adjustable APD Current Limit with External Resistor

^Low Shutdown Current <1μA

^Built-In Soft-Start

^CTRL Pin Allows Output Adjustment with no Polarity

Inversion

 Thin 16-Lead WQFN Package

 RoHS Compliant and Halogen Free

Applications

 APD Bias

 PINDiode Bias

 Optical Receivers and Modules

 Fiber Optic Network Equipment

The RT8541/A also features a built-in 9ms soft-start

function to eliminate the inrush current during start-up

interval. The RT8541/A provides a low cost optical receiver

solution and can fit in very small PCB area.

The RT8541/Ais available in the WQFN-16L3x3 package.

Simplified Application Circuit

PUMP

VIN RT8541/A

CTRL

MONIN

OUT

SHDN

VOUT2

VOUT1

FSET

SET

MON

APD

GND

is a registered trademark of Richtek Technology Corporation.

DS8541/A-01 June 2015

www.richtek.com

12 3 4 5 6 7...13

中文翻译

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与RT8541相关器件

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RT8561A	RICHTEK	获取价格	暂无描述
RT8567A	RICHTEK	获取价格	6-CH 43V Constant Current LED Driver with PWM Dimming Control
RT8568A	RICHTEK	获取价格	6-CH 43V WLED Driver
RT8569	RICHTEK	获取价格	6 Strings 43V White LED Driver

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