Datasheet LT3476 (Analog Devices) - 3

LT3476
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denotes the specifications which apply over the full operating temperature range, (Note 3) otherwise specifications are at TA = 25°C. SW1-4 = 5V, VIN = 3.3V, SHDN = 3.3V, RT = 21k to GND, PWM1-4 = 3.3V, VADJ1-4 = REF, CAP1-4 = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
REF Line Regulation 2.8V ≤ VIN ≤ 16V 0.003 %/V Quiescent Current in Shutdown SHDN = 0V 0.1 10 µA Quiescent Current Idle PWM1-4 = 0V 5.5 mA Quiescent Current Active (Not Switching) VC1-4 = 0V 22 30 mA Switching Frequency RT = 8.25k 1700 2000 2300 kHz RT = 21k 850 1000 1150 kHz RT = 140k 160 200 240 kHz Nominal RT Pin Voltage 1.26 V Maximum Duty Cycle RT = 8.25k (2MHz) 76 % RT = 21k (1MHz) 84 90 % RT = 140k (200kHz) 98 % VADJ1-4 Input Bias Current Current Out of Pin –10 20 100 nA VC1-4 Idle Input Bias Current PWM1-4 = 0V –20 0 20 nA EAMP GM (∆IVC/∆VCAP-LED) 210 µS VC Output Impedance 3 MΩ SW1-4 Current Limit Static Test 1.5 2 2.5 A SW1-4 VCESAT ISW = 1.3A to GND 350 mV SW1-4 Leakage Current SHDN = 0V 0.1 5 µA CAP1-4 Overvoltage Protect Threshold 33.5 35 V CAP1-4/LED1-4 Idle Input Bias Current PWM1-4 < 0.4V, CAP = LED = 5V 100 nA CAP1-4/LED1-4 Input Bias Current CAP = LED = 5V 70 µA SHDN Input Low Voltage l 0.4 V SHDN Input High Voltage l 1.5 V SHDN Pin Current 16 30 µA PWM1-4 Input Low Voltage l 0.4 V PWM1-4 Input High Voltage l 1.5 V PWM1-4 Pin Current 50 100 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LT3476E is guaranteed to meet specifications from 0°C to may cause permanent damage to the device. Exposure to any Absolute 85°C junction temperature. Specifications over the –40°C to 85°C Maximum Rating condition for extended periods may affect device operating junction temperature range are assured by design, reliability and lifetime. characterization and correlation with statistical process controls. The
Note 2:
This IC includes overtemperature protection that is intended LT3476I is guaranteed to meet performance specifications over the –40°C to protect the device during momentary overload conditions. Junction to 125°C operating junction temperature range. temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 3476fb 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts