Datasheet

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Atmel MSL3080 Datasheet
8 String 60mA LED Driver with Integrated Boost Controller
Table of Contents
1.0 Packages and Pin Connections ................................................................. 3
2.0 Pin Descriptions .......................................................................................... 4
3.0 Absolute Maximum Ratings ....................................................................... 5
4.0 Electrical Characteristics ........................................................................... 6
5.0 Typical Operating Characteristics ............................................................. 7
6.0 Block Diagram ............................................................................................. 9
7.0 Typical Application Circuits ..................................................................... 10
8.0 Detailed Description ................................................................................. 13
8.1 LED Driver Comparison ................................................................................................. 13
8.2 Boost Regulator Overview ............................................................................................. 14
8.3 Error Amplier ................................................................................................................ 14
8.4 Gate Driver ....................................................................................................................15
8.5 Soft-Start .......................................................................................................................15
8.6 Boost Fault Monitoring and Protection ..........................................................................15
8.7 LED Current Regulators and PWM Dimming Modes ....................................................15
8.8 Efciency Optimizer (EO) ..............................................................................................15
8.9 Fault Monitoring and Auto-Handling ..............................................................................15
8.10 Internal Supervisory and LDO .......................................................................................16
8.11 Internal Oscillator ...........................................................................................................16
8.12 Over Temperature Shutdown ......................................................................................... 16
8.13 Power Saving Modes ..................................................................................................... 16
8.14 I
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C Serial Interface and Driver Control...........................................................................16
9.0 Application Information ............................................................................ 17
9.1 Bypassing VIN and PVIN ...............................................................................................17
9.2 Setting the LED Current ................................................................................................17
9.3 Fault Monitoring and Automatic Fault Handling ............................................................. 17
9.4 Setting the LED Short-Circuit Threshold ........................................................................17
9.5 Boost Regulator ............................................................................................................. 18
9.6 The Efciency Optimizer (EO) .......................................................................................19
9.7 Setting the Boost Regulator Output Voltage .................................................................. 20
9.8 Choosing the Input and output Capacitors ....................................................................20
9.9 Choosing the Inductor ...................................................................................................20
9.10 Setting the External MOSFET Current Limit .................................................................. 21
9.11 Choosing the Switching MOSFET .................................................................................21
9.12 Choosing the Output Rectier .......................................................................................21
9.13 Loop Compensation ......................................................................................................21
10.0 LED Dimming Control ............................................................................... 23
11.0 Ordering Information ................................................................................ 23