AS3691A-ZQFP

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com AS3691 Datasheet Datasheet AS3691 4 Precision 400mA Current Sources for RGB and Single Color Leds 1 General Description 2) 15V is sufficient for most applications as the AS3691 dose not switch off the LED current completely am lc s on A te G nt st il Patent Pending lv ƒ 4 x up to 0.4A constant current outputs Programmable with external resistors 4 independent PWM inputs Absolute current accuracy +/-0.5% ’ Automatic Supply Regulation’ to reduce power dissipation1) 1) al id ƒ ƒ 2 Key Features ƒ ƒ ƒ ƒ ƒ Very wide output voltage current source voltage compliance − Down to 0.41V 2) − Up to 15V Integrated overtemperature protection Separate sense pads (Rfb1-Rfb4) for easy and precise PCB Layout Package − DIE − QFN24 4x4mm − eP-TSSOP ƒ The AS3691 (AS3691A and AS3691B) features four high precision current sources for lighting of up to four LED strings (RGB or single color leds). Each of the four currents sources can be controlled independently by PWM inputs. The full scale current value is set by external resistors. 3 Applications General Lighting Backlighting RGB Backlighting for LCD TV/Monitors with White Color Balancing ƒ ƒ ƒ 4 Application Diagrams Figure 1 – Application Diagram of AS3691 for Single Color Lighting VDD Csup 100nF VDD Rvdd Cvdd 100nF ca UV VREG CURR1 ni UV1 AS3691 UV2 CURR2 Vc UV3 CURR3 Vc UV4 UV CURR4 Vc Vc ch D1 Ref T1 I1 Te Overtemp Pad VSS T2 I2 R1 ON1 RFB1 T3 R2 RES1 ON2 RFB2 T4 I3 R3 RES2 ON3 Ri1 Ri2 RFB3 I4 R4 RES3 ON4 Ri3 RFB4 RES4 Ri4 VSS VSS PWM PWM www.austriamicrosystems.com (ptr) Revision 2.3 1 - 22 AS3691 Datasheet Figure 2 – Application Diagram of AS3691 for RGB Lighting VDDG VDDG VDDB VDDB VDDR VDDR Rvdd al id Cvdd 100nF UVG UVG UVB UVB UVR UVR CURR1 AS3691 UV3 CURR2 Vc Ref Vc T1 Pad T2 PWMB Vc VSS ON1 RFB1 R2 RES1 ON2 RFB2 T4 I3 R3 RES2 ON3 Ri2 RFB3 I4 R4 RES3 ON4 Ri3 RFB4 RES4 Ri4 VSS PWMG PWMB PWMR Te ch ni ca PWMR CURR4 T3 I2 R1 Ri1 PWMG UV4 Vc I1 Overtemp VSS CURR3 am lc s on A te G nt st il D1 UV2 lv UV1 VREG www.austriamicrosystems.com (ptr) Revision 2.3 2 - 22 AS3691 Datasheet Table of Contents 1 General Description ......................................................................................................................................... 1 2 Key Features.................................................................................................................................................... 1 3 Applications...................................................................................................................................................... 1 4 Application Diagrams ....................................................................................................................................... 1 5 Pinout............................................................................................................................................................... 4 Pin Assignments ....................................................................................................................................... 4 5.2 Pin Descriptions........................................................................................................................................ 4 6 al id 5.1 Characteristics ................................................................................................................................................. 6 Absolute Maximum Ratings ...................................................................................................................... 6 6.2 Operating Conditions ................................................................................................................................ 6 6.3 Electrical Characteristics........................................................................................................................... 7 7 lv 6.1 Typical Operation Characteristics .................................................................................................................... 8 8 Detailed Functional Description ..................................................................................................................... 12 Shunt Regulator...................................................................................................................................... 12 8.2 Overtemperature Protection.................................................................................................................... 12 8.3 Automatic Supply Regulation.................................................................................................................. 13 9 am lc s on A te G nt st il 8.1 Application Information .................................................................................................................................. 14 9.1 Design Example...................................................................................................................................... 15 9.1.1 Using Automatic Supply Regulation................................................................................................. 16 9.2 Layout Recommendations ...................................................................................................................... 16 10 Package Drawings and Markings ............................................................................................................... 17 10.1 QFN 4x4 Package Drawings and Marking .............................................................................................. 17 10.2 ePTSSOP Package Drawings and Marking............................................................................................ 19 10.3 DIE Delivery............................................................................................................................................ 20 11 Ordering Information .................................................................................................................................. 21 ca Revision History Revision Owner Description 30.10.2007 ptr - Added Trays as delivery option (order code AS3691AZQFT) Te ch ni 2.3 Date www.austriamicrosystems.com (ptr) Revision 2.3 3 - 22 AS3691 Datasheet 5 Pinout 5.1 Pin Assignments Figure 3 – Pin Usage UV1 CURR1 AS3691 UV2 CURR2 Vc UV3 CURR3 Vc UV4 CURR4 al id VREG Vc Vc D1 T1 I1 Overtemp R1 T3 I2 R2 T4 I3 R3 I4 R4 am lc s on A te G nt st il Pad T2 lv Ref VSS ON1 RES1 ON2 RFB1 RES2 ON3 RFB2 RFB3 RES3 ON4 RFB4 RES4 5.2 Pin Descriptions Table 1 – Pin Type Descriptions Pin Type AI/O Description Analog Pin Analog Input Pin AO Analog Output Pin DI Digital Input S Supply Pin ca AI Table 2 – Pin Descriptions Pin Number QFN Package Pin Number ePTSSOP Package Pin Name 1 10 Description CURR1 AI/O Current Source 1 Output 11 RFB1 AI Connect to current set resistor R1 directly at resistor itself 3 12 nc nc Leave open 4 13 RFB4 AI Connect to current set resistor R4 directly at resistor itself 5 14 CURR4 AI/O Current Source 4 Output 6 15 RES4 AI/O Connect to current set resistor R4 Te ch 2 ni Type www.austriamicrosystems.com (ptr) Revision 2.3 4 - 22 AS3691 Datasheet Pin Number QFN Package Pin Number ePTSSOP Package Pin Name Type Description 16 ON4 DI 8 17 UV4 AO Automatic supply regulation for CURR4; if not used, leave open 9 18 TEST AI Digital Test input; Leave open or connect to VSS; internal pulldown to VSS 10 19 UV3 AO Automatic supply regulation for CURR3; if not used, leave open Current source CURR3 control; internal pullup resistor to VREG (can be left open, if CURR3 is always switched on) High … 100% Current Low … 5% Current lv al id 7 Current source CURR4 control; internal pullup resistor to VREG (can be left open, if CURR4 is always switched on) High … 100% Current Low … 5% Current 20 ON3 DI 12 21 RES3 AI/O Connect to current set resistor R3 13 22 CURR3 AI/O Current Source 3 Output 14 23 RFB3 AI Connect to current set resistor R3 directly at resistor itself 15 24 VREG S Shunt regulator supply; connect to Rvdd and Cvdd 16 1 RFB2 AI Connect to current set resistor R2 directly at resistor itself 2 CURR2 AI/O Current Source 2 Output 3 RES2 AI/O Connect to current set resistor R2 am lc s on A te G nt st il 11 17 18 19 20 DI 5 UV2 AO Automatic supply regulation for CURR2; if not used, leave open 6 VSS S 7 ch 8 VSS Supply connection AO Automatic supply regulation for CURR1; if not used, leave open ON1 DI Current source CURR1 control; internal pullup resistor to VREG (can be left open, if CURR1 is always switched on) High … 100% Current Low … 5% Current UV1 ni 22 23 ON2 ca 21 4 Current source CURR2 control; internal pullup resistor to VREG (can be left open, if CURR2 is always switched on) High … 100% Current Low … 5% Current 9 RES1 AI/O Pad Pad VSS S Connect to current set resistor R1 VSS Supply connection; add as many vias to ground plane as possible Te 24 www.austriamicrosystems.com (ptr) Revision 2.3 5 - 22 AS3691 Datasheet 6 Characteristics 6.1 Absolute Maximum Ratings Stresses beyond those listed in Table 1 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 Section 5 Electrical Characteristics is not implied. Table 3 – Absolute Maximum Ratings Note al id Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Symbol Parameter Min Max Unit VDDMAX Supply for LEDs -0.3 >17 V See notes1 VINVREG VREG Supply voltage -0.3 7.0 V Applicable for pin VREG V Applicable for 5V pins2 V Applicable for CURR1, CURR2, CURR3 and CURR4 5V Pins -0.3 VIN15V 15V Pins -0.3 17 IIN Input Pin Current -25 +25 mA At 25ºC, Norm: Jedec 17 TSTRG Storage Temperature Range -55 125 °C Humidity 5 85 % Non condensing VESD Electrostatic Discharge -2000 2000 V Norm: MIL 883 E Method 3015 PT Total Power Dissipation 2.0 W At 50ºC, no airflow for QFN24 on 3 two layer FR4-Cu PCB PDERATE PT Derating Factor 23 TBODY Body Temperature during Soldering 260 am lc s on A te G nt st il Notes: 1. 2. 3. lv VIN5V VREG+ 0.3V mW/ See notes3 °C °C according to IPC/JEDEC J-STD020C As the AS3691 is not directly connected to this supply. Only the parameters VINVREG, VIN5V and VIN15V have to be guaranteed by the application All pins except CURR1, CURR2, CURR3 and CURR4 Depending on actual PCB layout and especially number of vias below the exposed pad – see layout recommendations; can be improved e.g. with Al-PCB or airflow ca 6.2 Operating Conditions Symbol Parameter Te VDDTOL Main Supply Voltage Tolerance VREGINT Min Typ Main Supply ch VDD ni Table 4 – Operating Conditions Supply (shunt regulated by AS3691) VREGEXT IVREG Supply Current TAMB Ambient Temperature www.austriamicrosystems.com (ptr) -20 Max Unit Note Not Limited V Supply is not directly connected to the AS3691 – see section ‘Shunt Regulator’ +20 % Applies only for supply VREG is connected via Rvdd 5.0 5.2 5.4 V If internally (shunt-)regulated by D1 4.5 4.75 5.0 V If externally supplied -20 25 Revision 2.3 2.5 Excluding current through shunt mA regulator (D1) – see section ‘Shunt Regulator’ 85 °C 6 - 22 AS3691 Datasheet 6.3 Electrical Characteristics Table 5 – Analog Electrical Characteristics Current Source CURR1 to CURR4 Voltage Compliance VCURR ICURR Current Source Range ICURR, Min Typ Max Unit 0.9 15.0 V 0.41 15.0 V at 100mA 10 400(1) mA -0.5 +0.5 % @25C TJUNCTION, excluding variation of external resistors; V(CURRx)