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LT1676CS8 Datasheet(PDF) 3 Page - Linear Technology |
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LT1676CS8 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LT1676 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Timing f Switching Frequency 90 100 110 kHz q 85 115 kHz Maximum Switch Duty Cycle q 85 90 % tON(MIN) Minimum Switch On Time High dV/dt Mode, RL = 50Ω (Note 4) 300 ns Boost Operation VC Pin Boost Threshold 1.35 V dV/dt Below Threshold 0.2 V/ns dV/dt Above Threshold 1.6 V/ns Sync Function Minimum Sync Amplitude q 1.5 2.2 V Synchronization Range q 130 250 kHz SYNC Pin Input R 40 k Ω SHDN Pin Function VSHDN Shutdown Mode Threshold 0.5 V q 0.2 0.8 V Upper Lockout Threshold Switching Action On 1.260 V Lower Lockout Threshold Switching Action Off 1.245 V ISHDN Shutdown Pin Current VSHDN = 0V 12 20 µA VSHDN = 1.25V 2.5 10 µA VIN = 48V, VSW open, VCC = 5V, VC = 1.4V unless otherwise noted. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. TEMPERATURE ( °C) –50 7.4 7.2 7.0 6.8 6.6 6.4 6.2 6.0 25 75 LT1676 G01 –25 0 50 100 125 Minimum Input Voltage vs Temperature SWITCH CURRENT (mA) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 300 500 1676 G02 100 200 400 600 700 125 °C –55 °C 25 °C DUTY CYCLE (%) 0 1000 800 600 400 200 0 80 1676 G03 20 10 30 50 70 90 40 60 100 TA = 25°C Switch Current Limit vs Duty Cycle Switch-On Voltage vs Switch Current Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Control circuitry powered from VCC. Note 3: Switch current limit is DC trimmed and tested in production. Inductor dl/dt rate will cause a somewhat higher current limit in actual application. Note 4: Minimum switch on time is production tested with a 50 Ω resistive load to ground. TYPICAL PERFORMANCE CHARACTERISTICS |
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