LT3482 90V Boost DC/DC Converter with APD Current Monitor

The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to 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 LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package

产品特点 Features

High Output Voltage: Up to 90V
Integrated Schottky Diodes
48V, 280mA Internal Switch
High Side APD Current Monitor
Adjustable Switching Frequency: 650kHz or 1.1MHz
Wide VIN Range: 2.5V to 16V
Surface Mount Components
Low Shutdown Current: <1µA
Soft-Start
Internal Compensation
CTRL Pin Allows Output Adjustment with No Polarity Inversion
3mm × 3mm 16-Lead QFN Package

应用

APD Bias
PIN Diode Bias
Optical Receivers and Modules
Fiber Optic Network Equipment

典型应用图

参数

LT3482 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT3482EUD#PBF	QFN	16	E	$4.93	$3.45
LT3482EUD#TRPBF	QFN	16	E		$3.51
LT3482IUD#PBF	QFN	16	I	$5.91	$4.14
LT3482IUD#TRPBF	QFN	16	I		$4.20

LT3482 数据手册及相关资料下载

数据手册(英文) : LT3482 - 90V Boost DC/DC Converter with APD Current Monitor.PDF
设计要点 (英文) : DN447 - A Complete Compact APD Bias Solution for a 10Gbits/s GPON System.PDF
可靠性数据 : R530 Reliability Data .PDF