DS3882 Dual-Channel CCFL Controller General Description Features Dual-Channel CCFL Controllers for Backlighting The DS3882 is a dual-channel cold-cathode fluorescent LCD Panels and Instrument Clusters in Navigation/ lamp (CCFL) controller for applications that provide up Infotainment Applications to 300:1 dimming. It is ideal for driving CCFLs used to backlight liquid crystal displays (LCDs) in navigation and Minimal External Components Required infotainment applications and for driving CCFLs used to 2 I C Interface backlight instrument clusters. The DS3882 is also appro- Per-Channel Lamp-Fault Monitoring for Lamp-Open, priate for use in marine and aviation applications. Lamp-Overcurrent, Failure to Strike, and Overvoltage The DS3882 features EMI suppression functionality and Conditions provides a lamp current overdrive mode for rapid lamp Status Register Reports Fault Conditions heating in cold weather conditions. The DS3882 supports Accurate (5%) Independent On-Board Oscillators configurations of 1 or 2 lamps with fully independent lamp for Lamp Frequency (40kHz to 100kHz) and DPWM control and minimal external components. Multiple DS3882 Burst-Dimming Frequency (22.5Hz to 440Hz) controllers can be cascaded to support applications requir- Lamp and DPWM Frequencies can be Synchronized ing more than 2 lamps. Control of the DS3882, after initial with External Sources to Reduce Visual LCD Artifacts programming setup, can be completely achieved through in Video Applications 2 I C software communication. Many DS3882 functions are Optional Spread-Spectrum Lamp Clock Reduces EMI also pin-controllable if software control is not desired. Lamp Frequency can be Stepped Up or Down to Move EMI Spurs Out of Band Applications Lamp Current Overdrive Mode with Automatic Instrument Clusters Turn-Off Quickly Warms Lamp in Cold Temperatures Marine and Aviation LCDs Analog and Digital Brightness Control 300:1 Dimming Range Possible Using the Digital Pin Configuration Brightness Control Option Programmable Soft-Start Minimizes Audible TOP VIEW + Transformer Noise FAULT 1 28 OVD2 On-Board Nonvolatile (NV) Memory Allows Device A0 2 27 LCM2 Customization SDA 3 26 GB2 8-Byte NV User Memory for Storage of Serial SCL 4 25 GA2 Numbers and Date Codes DS3882 LSYNC 5 24 V CC LOSC 6 23 PDN Low-Power Standby Mode BRIGHT 7 22 LCO 4.75V to 5.25V Single-Supply Operation PSYNC 8 21 GND -40C to +105C Temperature Range POSC 9 20 STEP 28-Pin TSSOP Package A1 10 19 N.C. GND S 11 18 OVD1 Ordering Information SVML 12 17 LCM1 PART TEMP RANGE PIN-PACKAGE SVMH 13 16 GB1 V 14 15 GA1 DS3882E+C -40C to +105C 28 TSSOP CC DS3882E+T&R/C -40C to +105C 28 TSSOP TSSOP +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. Typical Operating Circuit appears at end of data sheet. 19-5666 Rev 2 12/10DS3882 Dual-Channel CCFL Controller Absolute Maximum Ratings Voltage Range on V , SDA, and Operating Temperature Range ......................... -40C to +105C CC SCL Relative to Ground ....................................-0.5V to +6.0V EEPROM Programming Temperature Range ........0C to +85C Voltage Range on Leads Other than V , Storage Temperature Range ............................ -55C to +125C CC SDA, and SCL ....-0.5V to (V + 0.5V), not to exceed +6.0V Lead Temperature (soldering, 10s) .................................+300C CC Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) .......................................+260C A TSSOP (derate 12.8mW/C above +70C) ............1025.6mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Conditions (T = -40C to +105C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 4.75 5.25 V CC V CC Input Logic 1 V 2.0 V IH + 0.3 Input Logic 0 V -0.3 1.0 V IL V + CC SVML/H Voltage Range V -0.3 V SVM 0.3 V + CC BRIGHT Voltage Range V -0.3 V BRIGHT 0.3 V + CC LCM Voltage Range V (Note 2) -0.3 V LCM 0.3 V + CC OVD Voltage Range V (Note 2) -0.3 V OVD 0.3 Gate-Driver Output Charge Q 20 nC G Loading Electrical Characteristics (V = +4.75V to +5.25V, T = -40C to +105C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I G , G loaded with 600pF, 2 channels active 12 mA CC A B Input Leakage (Digital Pins) I -1.0 +1.0 A L Power-Down Current I 2 mA PDN Output Leakage (SDA, FAULT) I High impedance -1.0 +1.0 A LO Low-Level Output Voltage V I = 4mA 0.4 V OL OL (LSYNC, PSYNC) V I = 3mA 0.4 OL1 OL1 Low-Level Output Voltage V (SDA, FAULT) V I = 6mA 0.6 OL2 OL2 Low-Level Output Voltage V I = 4mA 0.4 V OL3 OL3 (GA, GB) High-Level Output Voltage V I = -1mA 2.4 V OH OH (LSYNC, PSYNC) Maxim Integrated 2 www.maximintegrated.com