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Data Sheet

FULL DATA SHEET (PDF, 968kB) Download   E-Mail

Description

The DS3988 is an 8-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3988 supports configurations of 1 to 8 lamps, and multiple DS3988 controllers can be cascaded to support applications requiring more than 8 lamps.

Key Features		Applications/Uses
High-Density CCFL Controller for LCD TV and PC Monitor Backlights Can Be Easily Cascaded to Support More Than 8 Lamps Minimal External Components Analog Brightness Control Per-Channel Lamp Control Ensures Equal Brightness Among Lamps and Maximizes Lamp Life Gate Driver Phasing Minimizes DC Supply Current Surges Per-Channel Lamp Fault Monitoring for Lamp Open, Lamp Overcurrent, Failure to Strike, and Overvoltage Conditions Accurate (±5%) Independent On-Board Oscillators for Lamp Frequency (40kHz to 80kHz) and DPWM Burst Dimming Frequency (22.5Hz to 440Hz) Can Be Synchronized to External Sources for the Lamp and DPWM Frequencies <10% to 100% Dimming Range Programmable Soft-Start Minimizes Audible Transformer Noise I²C-Compatible Serial Port and On-Board Nonvolatile (NV) Memory Allow Device Customization 8-Byte NV User Memory for Storage of Serial Numbers and Date Codes 4.5V to 5.5V Single-Supply Operation -40°C to +85°C Temperature Range 48-Lead TQFP (7mm x 7mm) Package		LCD PC Monitors LCD TVs

Diagram

Typical Operating Circuit

Application Notes

Application Note 3375: DS3984 / DS3988 Transformer Turns Ratio Selection - DS3988 Application Note 3513: Design Challenges for Backlighting LCD TVs - DS3988 Application Note 3528: CCFL Characteristics - DS3988 Application Note 3614: Staggering the Burst Dimmer on CCFL Displays - DS3988 Application Note 3615: DS3984/DS3988 Multiple Lamp Drive Scheme - DS3988 Application Note 3695: DS3984/DS3988 Common Lamp Return - DS3988 Application Note 3835: CCFL Push-Pull Snubber Circuit - DS3988 Application Note 4135: Implementing Analog Dimming on the DS39xx CCFL Controllers - DS3988 Application Note 4190: Enhancing the Gate-Drive Capacity of the DS39xx CCFL Controllers - DS3988

Evaluation Kits

none

Design Guides

DISPLAYS (PDF)

Reliability Reports

Reliability Report: DS3988.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-3 of 3
DS3988	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS3988T+T&R			TQFP;48 pin;85 mm² Dwg: 56-G4016-001A (PDF) Use pkgcode/variation: C48+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3988T			TQFP;48 pin;85 mm² Dwg: 56-G4016-001A (PDF) Use pkgcode/variation: C48-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS3988T+			TQFP;48 pin;85 mm² Dwg: 56-G4016-001A (PDF) Use pkgcode/variation: C48+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2005-10-13

Related Products

DS3984 4-Channel Cold-Cathode Fluorescent Lamp Controller

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Technical Documents

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

Related Products   Notes and Comments   Evaluation Kits