CAT3649 6-Channel LED Driver with 32 Dimming Levels & PWM Description The CAT3649 is a high efficiency fractional charge pump that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump CAT3649 Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit VIN, LEDx, C1, C2, PWM, ADIM, CPWM voltage GND0.3 to 6 V VOUT GND0.3 to 7 V Storage Temperature Range 65 to +160 C Junction Temperature Range 40 to +150 C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. Table 2. RECOMMENDED OPERATING CONDITIONS Parameter Rating Unit VIN 2.4 to 5.5 V Ambient Temperature Range 40 to +85 C LED pin Current range 0 to 25 mA Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. Table 3. RECOMMENDED ADIM, PWM TIMING (For 2.4 V V 5.5 V, over full ambient temperature range 40C to +85C.) IN Parameter Symbol Conditions Min Typ Max Units ADIM program low time T 0.2 2000 s LO ADIM program high time T 0.2 s HI ADIM to LED current settling time T No CPWM capacitor 40 s LED ADIM or PWM low time to shutdown T 12.5 20 30 ms PWRDWN PWM to VOUT delay time T 40 s PWM VOUT PWM maximum frequency F 200 kHz PWM MAX PWM minimum duty cycle DC 100 kHz PWM frequency 1 % PWM MIN