BD6155FVM

BD6155FVM Communication ICs DC/DC converter for LCD back light BD6155FVM BD6155FVM is an ideal IC to drive white LED used for the LCD back light of cellular phones, and PDA etc. This IC incorporates charging pump step-up circuit to drive white LED with high VF. It also integrates a driver to drive white LED with 4-step constant current. Only one external resistor can set the current value. !Applications Small portable appliances, such as cellular phones, PHS, PDA Battery-powered equipments using the white LED. !Features 1) Built-in charging pump step-up circuit. 2) Built-in constant current driver for LED. (Current value : 4 steps variable) 3) Ultra small MSOP8 package. (Height 0.9mm Max.) !Absolute maximum ratings (Ta=25°C) Parameter Maximum supply voltage Maximum input voltage Power dissipation Symbol VBAT VIN Pd Topr Tstg Limits −0.3~+6.0 −0.3~+6.0 350 ∗ −25~+75 −55~+125 Unit V V mW °C °C Operating temperature Storage temperature ∗ Reduce to 3.5mW/°C when Ta=25°C or above. !Recommended operating conditions (Ta=25°C) Parameter Power supply Symbol VBAT Min. 2.9 Typ. − Max. 5.5 Unit V 1/7 BD6155FVM Communication ICs !Block diagram CURRENT1 1 CURRENT CONT 8 CHARGE PUMP DRIVER 7 VBAT CURRENT2 2 C STBY 3 6 GND LEDS 4 5 LED !Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin Name CURRENT1 CURRENT2 STBY LEDS LED GND C VBAT Function Fixed current setup pin1. Fixed current setup pin2. Stand-by pin (High:Operation, Low:No operation) LED driver current pin (Fixed c...