LTC3350 datasheet(2/46 Pages) LINER

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LTC3350

3350fc

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Table oF conTenTs

Features..................................................... 1

Applications ................................................ 1

Typical Application ........................................ 1

Description.................................................. 1

Absolute Maximum Ratings.............................. 3

Order Information.......................................... 3

Pin Configuration .......................................... 3

Electrical Characteristics................................. 4

Typical Performance Characteristics ................... 7

Pin Functions ..............................................10

Block Diagram.............................................13

Timing Diagram...........................................14

Operation...................................................14

Introduction............................................................ 14

Bidirectional Switching Controller—Step-Down

Mode ...................................................................... 14

Bidirectional Switching Controller—Step-Up Mode 15

Ideal Diodes............................................................ 16

Gate Drive Supply (DRVCC) .................................... 17

Undervoltage Lockout (UVLO) ............................... 17

RT Oscillator and Switching Frequency .................. 17

Input Overvoltage Protection ................................. 17

VCAP DAC ............................................................... 17

Power-Fail (PF) Comparator.................................... 17

Charge Status Indication......................................... 17

Capacitor Voltage Balancer .................................... 17

Capacitor Shunt Regulators.................................... 18

I2C/SMBus and SMBALERT.................................... 18

Analog-to-Digital Converter .................................... 18

Capacitance and ESR Measurement ...................... 18

Monitor Status Register.......................................... 19

Charge Status Register...........................................20

Limit Checking and Alarms.....................................20

Die Temperature Sensor .........................................20

General Purpose Input ............................................20

Applications Information ................................21

Digital Configuration...............................................21

Capacitor Configuration..........................................21

Capacitor Shunt Regulator Programming ...............21

Setting Input and Charge Currents .........................21

Low Current Charging and High Current Backup ....22

Setting VCAP Voltage...............................................22

Power-Fail Comparator Input Voltage Threshold ...22

Setting VOUT Voltage in Backup Mode....................23

Compensation......................................................... 24

Minimum VCAP Voltage in Backup Mode.................24

Optimizing Supercapacitor Energy Storage Capacity..

Capacitor Selection Procedure ...............................26

Inductor Selection...................................................26

COUT and CCAP Capacitance....................................27

Power MOSFET Selection .......................................28

Schottky Diode Selection........................................28

Top MOSFET Driver Supply (CB, DB).......................29

INTVCC/DRVCC and IC Power Dissipation ...............29

Minimum On-Time Considerations..........................30

Ideal Diode MOSFET Selection ...............................30

PCB Layout Considerations ....................................30

Typical Applications ......................................39

Package Description .....................................44

Revision History ..........................................45

Typical Application .......................................46

Related Parts ..............................................46

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