Datasheet > LT3571

LT3571

更新时间： 2023-12-20 18:46:13

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管转换器
页数	文件大小	规格书
16页	219K
描述
用于 APD 偏置的 75V DC/DC 转换器

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LT3571 数据手册

LT3571

75V DC/DC Converter

for APD Bias

FEATURES

DESCRIPTION

The LT^®3571 is a current mode step-up DC/DC converter

designed to bias avalanche photodiodes (APDs) in optical

receivers with an output voltage up to 75V. The LT3571

features a high side ﬁxed voltage drop APD current moni-

tor with better than 10% relative accuracy over the entire

temperaturerange.Theintegratedpowerswitch,Schottky

diode and APD current monitor allow a small solution

footprint and low solution cost. It combines a traditional

voltage loop and a unique current loop to operate as

a constant-current source or constant-voltage source.

The inductor-based topology ensures an input free from

switching noise. The integrated high side current monitor

produces a current proportional to the APD current with

better than 10% relative accuracy over four decades of

dynamic range in the input range of 250nA to 2.5mA. This

current can be used as a reference to provide a digitally

programmed output voltage via the CTRL pin. The LT3571

is available in the tiny footprint (3mm × 3mm) 16-lead

QFN package.

High APD Voltage: Up to 70V

Integrated Schottky Diode

75V, 370mA Internal Switch

High Side Fixed Voltage Drop APD Current Monitor

Adjustable Frequency: 250kHz to 2MHz

Frequency Synchronization

Wide V Range: 2.7V to 20V

Constant-Voltage and Constant-Current Regulation

Programmable Current Limit Protection

Surface Mount Components

Low Shutdown Current <1μA

Internal Soft-Start

Internal Compensation

CTRL Pin Allows Output Adjustment with

No Polarity Inversion

3mm × 3mm 16-Lead QFN Package

APPLICATIONS

APD Bias

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PIN Diode Bias

Optical Receivers and Modules

Fiber Optic Network Equipment

TYPICAL APPLICATION

45V Low Noise APD Bias Power Supply

APD Bias Ripple

10μH

OFF ON

1μF

OUT

SHDN

20Ω

REF

50V

500μV/DIV

CTRL

LT3571

MONIN

10nF

SYNC

GND MON

APD

20.5k

3571 TA01b

= 1mA

500ns/DIV

APD

12.1k

1MHz

49.9Ω

45V

0.1μF

10k

0.1μF

10nF

3571 TA01a

3571fa

12 3 4 5 6 7...16

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