CAT4101 1 A Constant-Current LED Driver with PWM Dimming Description The CAT4101 is a constantcurrent sink driving a string of highbrightness LEDs up to 1 A with very low dropout of 0.5 V at full CAT4101 Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Units VIN, RSET, EN/PWM Voltages 6 V LED Voltage 25 V Storage Temperature Range 65 to +150 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 Units VIN Voltage 3.0 to 5.5 V LED Pin Voltage V device enabled, continuous operation Up to 6 device disabled or transient when enabled Up to 25 Ambient Temperature Range 40 to +85 C LED Pin Current Up to 1 A NOTE: Typical application circuit with external components is shown on page 1. 1. For additional temperature options, please contact your nearest ON Semiconductor Sales office. Table 3. ELECTRICAL OPERATING CHARACTERISTICS (Min and Max values in bold are over recommended operating conditions unless specified otherwise. Typical values are at V = 5.0 V, T = 25C) IN AMB Symbol Parameter Conditions Min Typ Max Units I LED Current Accuracy V = 1 V, RSET = 1.47 k 315 350 385 mA LEDACC LED 700 V = 1 V, RSET = 750 LED V = 1 V, RSET = 549 1000 LED V Dropout Voltage I = 1 A 500 mV DOUT LED V RSET Pin Voltage 1.17 1.20 1.23 V RSET I Quiescent Current No LED, RSET = Floating 0.8 mA Q No LED, RSET = 549 8.0 I Shutdown Current V = 0 V 1 A QSHDN EN EN/PWM Pin R Pulldown resistance 200 k EN/PWM V Logic High Level V HI 1.3 V Logic Low Level V LO 0.4 T Thermal Shutdown 150 C SD T Thermal Hysteresis 20 C HYS I /I RSET to LED Current gain ratio 100 mA LED current 400 LED RSET V Undervoltage lockout (UVLO) Threshold 2.0 V UVLO