SNVS867
June 2014
LM3633
PRODUCTION DATA.
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
Handling Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Control Bank Mapping
7.3.1.1
High-Voltage Control Banks (A and B)
7.3.1.2
Low-Voltage Control Banks (C, D, E, F, G, and H)
7.3.2
Pattern Generator
7.3.3
PWM Input
7.3.4
HWEN Input
7.3.5
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
High-Voltage LED Control
7.4.1.1
High-Voltage Boost Converter
7.4.1.2
High-Voltage Current Sinks (HVLED1, HVLED2 and HVLED3)
7.4.1.3
High-Voltage Current String Biasing
7.4.1.4
Boost Switching-Frequency Select
7.4.1.5
Automatic Switching Frequency Shift
7.4.1.6
Brightness Register Current Control
7.4.1.6.1
8-Bit Control (Preferred)
7.4.1.6.2
11-Bit Control
7.4.1.7
PWM Control
7.4.1.7.1
PWM Input Frequency Range
7.4.1.7.2
PWM Input Polarity
7.4.1.7.3
PWM Zero Detection
7.4.1.8
Start-up/Shutdown Ramp
7.4.1.9
Run-Time Ramp
7.4.1.10
High-Voltage Control A/B Ramp Select
7.4.1.11
LED Current Mapping Modes
7.4.1.12
Exponential Mapping
7.4.1.12.1
8-Bit Code Calculation
7.4.1.12.2
11-Bit Code Calculation
7.4.1.13
Linear Mapping
7.4.1.13.1
8-Bit Code Calculation
7.4.1.13.2
11-Bit Code Calculation
7.4.2
Low-Voltage LED Control
7.4.2.1
Integrated Charge Pump
7.4.2.2
Charge Pump Disabled
7.4.2.3
Automatic Gain
7.4.2.4
Automatic Gain (Flying Capacitor Detection)
7.4.2.5
1X Gain
7.4.2.6
2X Gain
7.4.2.7
Low-Voltage Current Sinks (LVLED1 to LVLED6)
7.4.2.8
Low-Voltage LED Biasing
7.4.2.9
Brightness Register Current Control
7.4.2.10
LED Current Mapping Modes
7.4.2.11
Exponential Mapping
7.4.2.12
Linear Mapping
7.4.2.13
Start-up/Shutdown Ramp
7.4.2.14
Run-Time Ramp
7.4.3
Low-Voltage LED Pattern Generator
7.4.3.1
Delay Time
7.4.3.2
Rise Time
7.4.3.3
Fall Time
7.4.3.4
High Period
7.4.3.5
Low Period
7.4.3.6
Low-Level Brightness
7.4.3.7
High-Level Brightness
7.4.4
Fault Flags/Protection Features
7.4.4.1
Open LED String (HVLED)
7.4.4.2
Shorted LED String (HVLED)
7.4.4.3
Open LED (LVLED)
7.4.4.4
Shorted LED (LVLED)
7.4.4.5
Overvoltage Protection (Inductive Boost)
7.4.4.6
Current Limit (Inductive Boost)
7.4.4.7
Current Limit (Charge Pump)
7.4.5
I2C-Compatible Interface
7.4.5.1
Start and Stop Conditions
7.4.5.2
I2C-Compatible Address
7.4.5.3
Transferring Data
7.5
Register Descriptions
7.5.1
Pattern Generator Registers
8
Applications and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Boost Converter Maximum Output Power (Boost)
8.2.2.1.1
Peak Current Limited
8.2.2.1.2
Output Voltage Limited
8.2.2.2
Boost Inductor Selection
8.2.2.3
Output Capacitor Selection
8.2.2.4
Schottky Diode Selection
8.2.2.5
Input Capacitor Selection
8.2.2.6
Maximum Output Power (Charge Pump)
8.2.2.7
Charge Pump Flying Capacitor Selection
8.2.2.8
Charge Pump Output Capacitor Selection
8.2.2.9
Charge Pump Input Capacitor Selection
8.2.3
Application Performance Plots
8.3
Initialization Set Up
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines (Boost)
10.1.1
Boost Output Capacitor Placement
10.1.2
Schottky Diode Placement
10.1.3
Inductor Placement
10.1.4
Boost Input Capacitor Placement
10.2
Layout Guidelines (Charge Pump)
10.2.1
Flying Capacitor (CP) Placement
10.2.2
Output Capacitor (CPOUT) Placement
10.2.3
Charge Pump Input Capacitor Placement
10.3
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.2
Trademarks
11.3
Electrostatic Discharge Caution
11.4
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
YFQ|20
MXBG174
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvs867_oa
snvs867_pm
4 Revision History
Date
Revision
Notes
June 2014
*
Initial release