LM3503 Datasheet | National Semiconductor

Description The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a plete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin. With no external pensation, cycle-by-cycle current limit, output over-voltage protection, input under-voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers. Features n Drives up to 4, 6, 8 or 10 White LEDs for Dual Display Backlighting n >80% Peak Efficiency n Output Voltage Protection Options: 16V, 25V, 35V & 44V n Input Under-Voltage Protection n Internal Soft Start Eliminates Inrush Current n 1 MHz Constant Switching Frequency n Analog Brightness Control n Wide Input Voltage Range: 2.5V to 5.5V n Low Profile Packages: <1 mm Height - 10 Bump Micro SMD - 16 Pin LLP Applications n Dual Display Backlighting in Portable devices n Cellular Phones and PDAs Typical Application © 2006 National Semiconductor Corporation DS201286 .national. Connection Diagrams 10-Bump Thin Micro SMD Package (TLP10) 16-Lead Thin Leadless Leadframe Package (SQA16A) Top View Top View .national. Pin Descriptions/Functions Bump # A1 B1 C1 Pin # 9 7 6 D1 D2 2 and 3 D3 15 and 16 C3 B3 A3 A2 Name Cntrl Fb VOUT2 VOUT1 Sw Pgnd Agnd VIN En2 En1 NC NC NC NC DAP Description...