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LTC3809IDD-1-TR Datasheet(PDF) 3 Page - Linear Technology |
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LTC3809IDD-1-TR Datasheet(HTML) 3 Page - Linear Technology |
3 / 24 page LTC3809-1 3 38091fc ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3809E-1 is guaranteed to meet specified performance from 0°C to 85°C. Specifications over the – 40°C to 85°C operating range are assured by design characterization, and correlation with statistical process controls. The LTC3809I-1 is guaranteed to meet specified performance over the full –40°C to 85°C operating temperature range. PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops Input DC Supply Current Normal Operation Sleep Mode Shutdown UVLO (Note 4) RUN = 0V VIN = UVLO Threshold –200mV 350 105 9 9 500 150 20 20 μA μA μA μA Undervoltage Lockout Threshold (UVLO) VIN Falling VIN Rising l l 1.95 2.15 2.25 2.45 2.55 2.75 V V Shutdown Threshold of RUN Pin 0.8 1.1 1.4 V Start-Up Current Source TRACK/SS = 0V 0.65 1 1.35 μA Regulated Feedback Voltage (Note 5) l 0.591 0.6 0.609 V Output Voltage Line Regulation 2.75V < VIN < 9.8V (Note 5) 0.01 0.04 %/V Output Voltage Load Regulation ITH = 0.9V (Note 5) ITH = 1.7V 0.1 –0.1 0.5 –0.5 % % VFB Input Current (Note 5) 9 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.7 V Overvoltage Protect Hysteresis 20 mV Auxiliary Feedback Threshold 0.325 0.4 0.475 V Top Gate (TG) Drive Rise Time CL = 3000pF 40 ns Top Gate (TG) Drive Fall Time CL = 3000pF 40 ns Bottom Gate (BG) Drive Rise Time CL = 3000pF 50 ns Bottom Gate (BG) Drive Fall Time CL = 3000pF 40 ns Maximum Current Sense Voltage ( ΔVSENSE(MAX)) (VIN – SW) IPRG = Floating (Note 6) IPRG = 0V (Note 6) IPRG = VIN (Note 6) l l l 110 70 185 125 85 204 140 100 223 mV mV mV Soft-Start Time (Internal) Time for VFB to Ramp from 0.05V to 0.55V 0.5 0.74 0.9 ms Oscillator Frequency 480 550 600 kHz The l indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise noted. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA °C/W) Note 4: Dynamic supply current is higher due to gate charge being delivered at the switching frequency. Note 5: The LTC3809-1 is tested in a feedback loop that servos ITH to a specified voltage and measures the resultant VFB voltage. Note 6: Peak current sense voltage is reduced dependent on duty cycle to a percentage of value as shown in Figure 1. |
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