CAT4104 700 mA Quad Channel Constant Current LED Driver Description The CAT4104 provides four matched low dropout current sinks to drive highbrightness LED strings up to 175 mA per channel. The CAT4104 Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit VIN, RSET, EN/PWM Voltages 0.3 to 6 V LED1, LED2, LED3, LED4 Voltages 0.3 to 25 V Storage Temperature Range 65 to +160 C Junction Temperature Range 40 to +150 C Lead Temperature 300 C 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 3.0 to 5.5 V Voltage applied to LED1 to LED4, outputs off up to 25 V Voltage applied to LED1 to LED4, outputs on up to 6 (Note 2) V Ambient Temperature Range 40 to +85 C I per LED pin 10 to 175 mA LED 2. Keeping LEDx pin voltage below 6 V in operation is recommended to minimize thermal dissipation in the package. NOTE: Typical application circuit with external components is shown on page 1. Table 3. ELECTRICAL OPERATING CHARACTERISTICS (Min and Max values are over the recommended operating conditions unless specified otherwise. Typical values are at VIN = 5.0 V, T = 25C.) AMB Symbol Name Conditions Min Typ Max Units I LED Current Accuracy 2 % I I LED ACC LED LEDNOM I LEDNOM I LED Channel Matching 5 1 +5 % I I LED DEV LED LEDAVG (Note 3) I LEDAVG V Dropout Voltage I = 175 mA 400 mV DOUT LED V RSET Pin Voltage 1.17 1.2 1.23 V RSET I Quiescent Current No LED, RSET = Float 0.6 mA Q No LED, RSET = 770 6 I Shutdown Current V = 0 V 1 A QSHDN EN EN/PWM Pin R Internal pulldown resistance 200 k EN/PWM V Logic High Level 1.3 V HI V Logic Low Level 0.4 V LO T Thermal Shutdown 150 C SD T Thermal Hysteresis 20 C HYS I /I RSET to LED Current gain ratio 25 mA LED current 100 LED RSET V Undervoltage lockout (UVLO) threshold 2.0 V UVLO 3. Min and Max values are tested for I = 50 mA, VIN = 3.5 V, VLEDx = 0.4 V, T = 25C. LED AMB