CAT3224 LED Driver, Charge Pump, 2-Channel Description The CAT3224 is a very highcurrent integrated flash LED driver which also supports the charging function for a dual cell CAT3224 1 F Dual Cell CP CN VIN (2.5 V to 5.5 V) Supercapacitor VIN CAP 1 F 1 F CAT3224 CAP + FLAG 0.55 F BAL CHRG LEDA FLASH LEDB TORCH RC RF RT GND 2A 2A 826 261 562 GND Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit VIN, RC, RF, RT voltage GND0.3 to 6 V CAP, CP, CN voltage GND0.3 to 7 V CHRG, FLASH, TORCH, FLAG voltage (Note 1) GND0.3 to 6 V BAL, LEDA, LEDB GND0.3 to CAP+0.3 V Storage Temperature Range 65 to +160 C Junction Temperature Range 40 to +150 C Lead Temperature 300 C ESD Rating HBM (Human Body Model) 2000 V ESD Rating MM (Machine Model) 200 V Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 2. RECOMMENDED OPERATING CONDITIONS Parameter Rating Unit VIN 2.0 to 5.5 V Ambient Temperature Range 40 to +85 C LEDA, LEDB current (in flash mode) up to 2 A LEDA, LEDB current (in torch mode) 10 to 200 mA Input Current Limit up to 1 A FLAG pullup resistor current 0 to 10 mA LED Forward Voltage Range (Vf) 1.3 to 4.2 V Table 3. PACKAGE THERMAL IMPEDANCE Parameter Range Unit TQFN 3 mm x 3 mm 16Lead (Note 2) 42 C/W JA Table 4. PACKAGE TRANSIENT THERMAL IMPEDANCE Parameter Range Unit TQFN 3 mm x 3 mm 16Lead Transient (Note 3) (100 ms pulse) 7 C/W JA 1. Pins can be driven above VIN with no leakage current or change in operation. 2. (Junction to Ambient thermal resistance) is calculated with 2 square inches of copper connected to package exposed pad. JA 3. Transient is calculated for a 100 ms pulse at 5 watts with 2 square inches of copper connected to package exposed pad. JA