SM8144B EL Sheet Driver NIPPON PRECISION CIRCUITS INC. OVERVIEW ry The SM8144B is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80 cm2 in size. It is a high-efficiency driver that features revised coil switching transistor ON resistance and output circuit configuration to reduce loss, all in a compact package. A microcontroller interface pin (ENA) is provided, which can be used to control the EL driver ON/OFF function. The device is available in 8-pin VSOP packages. FEATURES Dedicated EL driver 1.6 to 5.5 V supply voltage 100mA maximum operating current (VDD = 3.0V, Ta ≤ 70°C) 3.5Ω typical output resistance 200 Vp-p maximum EL driver voltage* 31 to 1500 Hz EL drive frequency range* High voltage CMOS Process 8-pin VSOP plastic package pre lim ina ■ PINOUT (Top view) ■ ■ ■ ■ ■ ■ ■ CHV 1 8 OUT1 LDR 2 7 OUT2 VSS 3 6 VDD OSC 4 5 ENA 8144BV *: Adjustable with external resistance. APPLICATIONS ■ ■ ■ PACKAGE DIMENSIONS Hand held PC, Palm size PC Mobile IT equipment White EL (Unit : mm) 0 to 10 0.575 typ 3.1 ± 0.3 0.5 ± 0.2 8-pin V S O P 6.4 ± 0.3 SM8144BV +0.1 0.15 −0.05 1.15 ± 0.05 P ackag e 0.65 0.10 0.1 ± 0.05 D e vice 4.4 ± 0.2 ORDERING INFORMATION 0.22 ± 0.1 0.12 M NIPPON PRECISION CIRCUITS—1 SM8144B BLOCK DIAGRAM VDD ina ry EL sheet < 80cm2 LDR CHV OUT1 OUT2 Switching Circuit Boosting Block Dividing Circuit 1/4 Dividing Circuit 1/1024 Oscillator for Boosting and EL driving VSS ENA OSC Oscillation Block lim ROSC ENA from microcontroller When ENA is logical "H", SM8144B is active. PIN DESCRIPTION Name I/O 1 CHV I High-voltage DC input 2 LDR O Booster coil driver output Function pre Pin nu m b e r 3 VSS – Ground 4 OSC I Coil and EL driver oscillator (oscillator frequency determined by external resistor) 5 ENA I E n a ble input (built-in pull-down resistor) 6 VDD – Supply 7 OUT2 O Output 2 8 OUT1 O Output 1 NIPPON PRECISION CIRCUITS—2 SM8144B SPECIFICATIONS Absolute Maximum Ratings Symbol Supply voltage range VDD Input voltage range V IN Output voltage Unit − 0.3 to 7.0 V V S S − 0.3 to V D D + 0.3 V CHV pin 0.5 to 120 V VLDR LDR pin 0.5 to 120 V OUT1, OUT2 pin 0.5 to 120 V T a ≤ 70 °C 140 mW T a ≤ 85 °C 100 mW − 55 to 125 °C PD Storage temperature range All Input pins Rating VCHV VOUT1/2 Pow er dissipation Condition ina ry P arameter TSTG Recommended Operating Conditions Rating P arameter Symbol VDD2 Operating temperature TO P R Operating current 1 Coil inductance ID D 2 LLDR Unit min typ max 1.6 3.0 5.5 V − 40 – 85 °C Including coil current, V D D = 3.0V, T a ≤ 70 °C – – 100 mA Including coil current, V D D = 5.0V, T a ≤ 70 °C – – 60 mA Including coil current, V D D = 3.0V, T a ≤ 85 °C – – 70 mA Including coil current, V D D = 5.0V, T a ≤ 85 °C – – 42 mA fL D R = 64 kHz – 0.47 – mH lim Supply voltage range Condition pre 1. Max value is as same as Absolute Maximum Ratings. NIPPON PRECISION CIRCUITS—3 SM8144B DC Characteristics VDD = 3.0 V, Ta = 25 °C unless otherwise noted. Rating Symbol Supply voltage VDD CHV output voltage VCHV OUT1, OUT2 HIGH-level output voltage VOUTH O U T 1 , O U T 2 L OW -level output voltage VOUTL LDR output resistance R LDR OSC oscillator frequency fO S C 1 OSC oscillator frequency range fO S C 2 OUT1, OUT2 output frequency fO U T 1 OUT1, OUT2 output frequency range fO U T 2 LDR inductance driver frequency fL D R 1 LDR inductance driver frequency range fL D R 2 ENA HIGH-level input voltage VENAH E N A L OW -level input voltage VENAL ENA input current IE N A H tE N A Operating current Stand-by current 1. ENA VSS VDD − 0.5 Unit min typ max 1.6 3.0 5.5 V 0.5 – 100 V – – 100 V – – 0.5 V – 3.5 5.25 Ω 205 256 307 32 – 1536 200 250 300 31 – 1500 51 64 77 8 – 384 ENA = HIGH, V D D = 1.6 to 5.5V V D D – 0.5 – V D D + 0.3 E N A = L OW , V D D = 1.6 to 5.5V V S S – 0.3 – V S S + 0.5 2.0 4.0 6.0 µA – – 100 µs IL D R = 50 mA R O S C = 180 k Ω R O S C = 180 k Ω R O S C = 180 k Ω V E N A H = V D D = 3.0V lim ENA r ise time 1 Condition ina ry P arameter kHz Hz kHz V ID D 1 Excluding coil current – – 1.0 mA IS T B E N A = L OW – – 1.0 µA VDD VSS + 0.5 pre tENA NIPPON PRECISION CIRCUITS—4 SM8144B TYPICAL APPLICATIONS ■ EL sheet size: 20 to 30cm2, Current consumption: 20mA EL sheet ina ry 0.1µF 100V CHV OUT1 LDR OUT2 VSS VDD OSC ENA 470µH 0.01µF 3.0V 180kΩ Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N471K04M00 ■ EL sheet size: 30 to 50cm2, Current consumption: 40mA CHV lim 0.1µF 100V OUT1 LDR OUT2 VSS VDD OSC ENA EL sheet 220µH 0.01µF 180kΩ 3.0V Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N221K04M00 EL sheet size: 50 to 100cm2, Current consumption: 80mA pre ■ 0.1µF 100V CHV OUT1 LDR OUT2 VSS VDD OSC ENA EL sheet 220µH 0.01µF 3.0V 360kΩ Diode: TOSHIBA 1SS250 Coil: TOKO D73LC (817CE221M) Note: Do not operate the S M 8 1 4 4 B with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged. NIPPON PRECISION CIRCUITS—5 pre lim ina ry SM8144B NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NP0006AE 2000.05 NIPPON PRECISION CIRCUITS—6