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All versions are No Longer Available. See Ordering Information for recommended replacements.

Data Sheet

FULL DATA SHEET (PDF, 504kB) Download   E-Mail

Description

The DS3984 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3984 supports configurations of 1 to 4 lamps, and multiple DS3984 controllers can be cascaded to support applications requiring more than 4 lamps.

Key Features		Applications/Uses
High-Density CCFL Controller for LCD TV and PC Monitor Backlights Can Be Easily Cascaded to Support More Than 4 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 32-Lead TQFP (7mm x 7mm) Package or 28-Pin SO (300 mils) Package		LCD PC Monitors LCD TVs

Diagram

Typical Operating Circuit

Application Notes

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

Reliability Reports

Reliability Report: DS3984.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: 1-6 of 6

DS3984	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS3984Z		N/A	No Longer Available	DS3994Z+	SOIC(W);28 pin;192.8 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28-6*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS3984Z+		N/A	No Longer Available	DS3994Z+	SOIC(W);28 pin;192.8 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3984Z+T&R		N/A	No Longer Available	DS3994Z+	SOIC(W);28 pin;192.8 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3984T		N/A	No Longer Available	DS3994Z+	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS3984T+T&R		N/A	No Longer Available	DS3994Z+	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3984T+		N/A	No Longer Available	DS3994Z+	TQFP;32 pin;84.6 mm² Dwg: 21-0292 Land Pattern: Not Available Use pkgcode/variation: C32+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Related Products

DS3988 8-Channel Cold-Cathode Fluorescent Lamp Controller

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