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LT3482IUD-TRPBF

90V Boost DC/DC Converter with APD Current Monitor

Linear Technology 

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

U

APPLICATIO S

■ APD Bias

■ PIN Diode Bias

■ Optical Receivers and Modules

■ Fiber Optic Network Equipment

LT3482

90V Boost DC/DC

Converter with APD

Current Monitor

DESCRIPTIO

The LT®3482 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 ac-

curacy 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.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

VIN

5V

OFF ON

10µH

0.1µF

1µF

SW

PUMP

VIN

MONIN

fSET LT3482

SHDN

CTRL

GND

VOUT2

VOUT1

FB

0.47µF

0.47µF

MON

APD 85V

AT 2.5mA

10nF

10k

0.1µF

0.1µF 1M

14k

VAPD

RIPPLE

100mV/DIV

3482 TA01a

Output Voltage Ripple

500ns/DIV

3482 TA01b

3482fa

1

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