LTC3809-1 ELECTRICAL CHARACTERISTICSThe l indicates specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VIN = 4.2V unless otherwise noted.PARAMETERCONDITIONSMINTYPMAXUNITSMain Control Loops Input DC Supply Current (Note 4) Normal Operation 350 500 μA Sleep Mode 105 150 μA Shutdown RUN = 0V 9 20 μA UVLO VIN = UVLO Threshold –200mV 9 20 μA Undervoltage Lockout Threshold (UVLO) VIN Falling l 1.95 2.25 2.55 V VIN Rising l 2.15 2.45 2.75 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) 0.1 0.5 % ITH = 1.7V –0.1 –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 (ΔV l SENSE(MAX)) IPRG = Floating (Note 6) 110 125 140 mV (V l IN – SW) IPRG = 0V (Note 6) 70 85 100 mV IPRG = VIN (Note 6) l 185 204 223 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 Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA °C/W) reliability and lifetime. Note 4: Dynamic supply current is higher due to gate charge being Note 2: The LTC3809E-1 is guaranteed to meet specifi ed performance delivered at the switching frequency. from 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating range Note 5: The LTC3809-1 is tested in a feedback loop that servos ITH to are assured by design characterization, and correlation with statistical a specifi ed voltage and measures the resultant VFB voltage. process controls. The LTC3809I-1 is guaranteed to meet specifi ed Note 6: Peak current sense voltage is reduced dependent on duty cycle performance over the full –40°C to 85°C operating temperature range. to a percentage of value as shown in Figure 1. 38091fc 3
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