NTE1502 Integrated Circuit 5–Step LED Driver Circuit for Linear Response Description: The NTE1502 is an integrated circuit in a 9–Lead SIP type package designed for driving 5–LED bar graphs or dot displays so that the LEDs may light linearly for input signal. Brightness of the LEDs can be controlled by using the output current adjustment pin provided. Features: D 5–LED Bar Graph or Dot Display Drive D Linear Response with Respect to Input D Brightness Externally Adjustable D High Output Current, Suitable for Green LED Drive D Lamp ON/OFF Hysteresis, No Flickering by Noise Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +18V Circuit Voltage, V8–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +16V Load Current Set Input Voltage, V7–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16V Output Voltage (Note 1), VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +16V Supply Current (Note 1), ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18mA Load Current Set Input Current (Note 2), I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Output Current (Note 1), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Power Dissipation (TA = +75°C ), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperatuere Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Note 1. Output Pin1, Pin2, Pin3, Pin4, and Pin6. Note 2. I7 which can be set IO = 20mA is assumed to be the absolute rated value. Electrical Characteristics: (TA = +25°C, VCC = 16V unless otherwise specified) Parameter Min Typ Max Unit VI(ON)1 1.63 1.83 2.00 V LED 2 VI(ON)2 2.20 2.43 2.64 V LED 3 VI(ON)3 2.80 3.03 3.27 V LED 4 VI(ON)4 3.38 3.64 3.88 V LED 5 VI(ON)5 3.92 4.14 4.37 V Input Voltage (LED ON) LED 1 Symbol Test Conditions Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 16V unless otherwise specified) Parameter Load Current Pin6 Pin1 to Pin4 Pin1 to Pin4, Pin6 Input Current Symbol Typ Max Unit VO = 1.2V, I7 = 4.25mA 13 16 – mA I1 to I4 VO = 2.5V, I7 = 4.25mA 13 16 – mA I1 to I4, I6 VO = 16V, I7 = 4.25mA – 16 19 mA V8–5 = 8.5V – – 50 µA V8–5 = 16V – – 5 mA V8–5 = 16V – – 18 mA VO = 16V – – 15 µA I9 Output Pin Leakage Current Min I6 I8 Supply Current Test Conditions I1 to I4, I6 Pin Connection Diagram (Front View) 9 VCC 8 Input 7 Output Current Adjust 6 LED 5 5 GND 4 LED 4 3 LED 3 2 LED 2 1 LED 1 .929 (23.6) .118 (3.0) .236 (6.0) 1 9 .098 (2.5) .100 (2.54) .118(3.0)