TK11890A DCDC Converter, 1ch, Step-up, Inductive DCDC1ch Feature Built-in Three Modes 3 LED Dimming and Shutdown Mode 2.0MHz High Speed Operation 2.0MHz Internal Switching Transistor (MAX 1.0A) (MAX 1.0A) Maximum Duty Cycle 90% 90% Very Small Inductor Available Very Small 9 Bump Flip Chip 1.5x1.5mm, 9-bump Operating Voltage Range VOP=2.65 to 8.0V VOP=2.65~8.0V Operating Temp. Range TOP=-30 to +85C TOP=-30~+85C PD=600mW Power Dissipation PD=600mW Characteristics Part Name Number of Current Stabilizer - TK11890A fOSC Number of LED in serial connection 2 to 4 LED 2.0MHz ILED Max 100mA Ordering Guide, Marking Part Name Ordering Name TK11890A Marking TK11890AB1G0B Description Order Size TK11890A: Part Name B1: WL-CSP FC-9 G0: PB-Free B: Tape&Reel, Back AAG LOT 3,000 pcs. /Reel Block Diagram, Standard Application LED Current Control Input VIN Referrence Voltage GND GND VFB1 CONT1 Oscillator B3 A3 PWM Comp Output Drive Control A2 B3 Open Circuit Protection Over Current Detector B2 C1 VIN A1 EAOUT C3 CONT1 C2 CONT2 SW1 B1 Error Amp 2 SW2 Control Circuit L 3.3F CIN 4.7F V FB2 GND A2 COUT RLED1 3.3 EAOUT GND SW RLED2 3.3 B1 A1 SBD MA21D3400L (Panasonic) 1.0F Page 130 C1 B2 A3 VFB1 CONT2 C2 VIN Error Amp 1 VFB2 C3 SW CEAOUT 0.1F White LED ILED=74mA 2010 AUTUMN