Datasheet LT3492 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Triple Output LED Driver with 3000:1 PWM Dimming |
| Pages / Page | 22 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 338 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LT3492
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V, SHDN = 5V, PWM1-3 = 5V, FADJ = 0.5V, CTRL1-3 = 1.5V, OVP1-3 = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operation Voltage (Note 4) 3 30 V VIN Undervoltage Lockout 2.1 2.4 V Full-Scale LED Current Sense Voltage ISP1-3 = 48V 98 100 103 mV l 96 104 mV One-Tenth Scale LED Current Sense Voltage CTRL1-3 = 100mV, ISP1-3 = 48V 7 10 13 mV ISPn/ISNn Operating Voltage 2.5 60 V VREF Output Voltage IREF = 200μA, Current Out of Pin l 1.96 2 2.04 V VREF Line Regulation 3V ≤ VIN ≤ 40V, IREF = 10μA 0.03 %/V Quiescent Current in Shutdown SHDN = 0V 0.1 10 μA Quiescent Current Idle PWM1-PWM3 = 0V 6 8 mA Quiescent Current Active (Not Switching) VC1-VC3 = 0V 11 15 mA Switching Frequency FADJ = 1.5V 1800 2100 2400 kHz FADJ = 0.5V 1000 1300 1600 kHz FADJ = 0.1V 280 340 400 kHz Maximum Duty Cycle FADJ = 1.5V (2.1MHz) 73 78 % FADJ = 0.5V (1.3MHz) 80 87 % FADJ = 0.1V (330kHz) 97 % CTRL1-3 Input Bias Current Current Out of Pin, CTRL1-3 = 0.1V 20 100 nA FADJ Input Bias Current Current Out of Pin, FADJ = 0.1V 20 100 nA OVP1-3 Input Bias Current Current Out of Pin, OVP1-3 = 0.1V 10 100 nA OVP1-3 Threshold 0.95 1 1.05 V VC1-3 Idle Input Bias Current PWM1-3 = 0V –20 0 20 nA VC1-3 Output Impedance ISP1-3 = 48V 10 MΩ EAMP gm (ΔIVC/ΔVCAP-LED) ISP1-3 = 48V 200 μS SW1-3 Current Limit (Note 3) 600 1000 1300 mA SW1-3 VCESAT ISW = 500mA (Note 3) 340 mV SW1-3 Leakage Current SHDN = 0V, SW = 5V 2 μA 3492fa 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V, SHDN = 5V, PWM1-3 = 5V, FADJ = 0.5V, CTRL1-3 = 1.5V, OVP1-3 = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operation Voltage (Note 4) 3 30 V VIN Undervoltage Lockout 2.1 2.4 V Full-Scale LED Current Sense Voltage ISP1-3 = 48V 98 100 103 mV l 96 104 mV One-Tenth Scale LED Current Sense Voltage CTRL1-3 = 100mV, ISP1-3 = 48V 7 10 13 mV ISPn/ISNn Operating Voltage 2.5 60 V VREF Output Voltage IREF = 200μA, Current Out of Pin l 1.96 2 2.04 V VREF Line Regulation 3V ≤ VIN ≤ 40V, IREF = 10μA 0.03 %/V Quiescent Current in Shutdown SHDN = 0V 0.1 10 μA Quiescent Current Idle PWM1-PWM3 = 0V 6 8 mA Quiescent Current Active (Not Switching) VC1-VC3 = 0V 11 15 mA Switching Frequency FADJ = 1.5V 1800 2100 2400 kHz FADJ = 0.5V 1000 1300 1600 kHz FADJ = 0.1V 280 340 400 kHz Maximum Duty Cycle FADJ = 1.5V (2.1MHz) 73 78 % FADJ = 0.5V (1.3MHz) 80 87 % FADJ = 0.1V (330kHz) 97 % CTRL1-3 Input Bias Current Current Out of Pin, CTRL1-3 = 0.1V 20 100 nA FADJ Input Bias Current Current Out of Pin, FADJ = 0.1V 20 100 nA OVP1-3 Input Bias Current Current Out of Pin, OVP1-3 = 0.1V 10 100 nA OVP1-3 Threshold 0.95 1 1.05 V VC1-3 Idle Input Bias Current PWM1-3 = 0V –20 0 20 nA VC1-3 Output Impedance ISP1-3 = 48V 10 MΩ EAMP gm (ΔIVC/ΔVCAP-LED) ISP1-3 = 48V 200 μS SW1-3 Current Limit (Note 3) 600 1000 1300 mA SW1-3 VCESAT ISW = 500mA (Note 3) 340 mV SW1-3 Leakage Current SHDN = 0V, SW = 5V 2 μA 3492fa 3
