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LTC3787-1 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3787-1 Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page LTC3872-1 3 38721f For more information www.linear.com/LTC3872-1 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 LTC3872-1 is tested under pulsed load conditions such that TJ ≈ TA. The LTC3872-1E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3872-1I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3872-1H is guaranteed over the full –40°C to 150°C operating junction temperature range. The maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range l 2.75 9.8 V Input DC Supply Current Normal Operation Shutdown UVLO Typicals at VIN = 4.2V (Note 4) 2.75V ≤ VIN ≤ 9.8V VRUN/SS = 0V VIN < UVLO Threshold 250 8 20 400 20 35 µA µA µA Undervoltage Lockout Threshold VIN Rising VIN Falling l l 2.3 2.05 2.45 2.3 2.75 2.55 V V Shutdown Threshold (at RUN/SS) VRUN/SS Falling VRUN/SS Rising l l 0.6 0.65 0.85 0.95 1.05 1.15 V V Regulated Feedback Voltage (Note 5) LTC3872-1E LTC3872-1I and LTC3872-1H l l 1.182 1.178 1.2 1.2 1.218 1.218 V V Feedback Voltage Line Regulation 2.75V < VIN < 9V (Note 5) 0.14 mV/V Feedback Voltage Load Regulation VITH = 1.6V (Note 5) VITH = 1V (Note 5) 0.05 –0.05 % % VFB Input Current (Note 5) 25 50 nA RUN/SS Pull Up Current VRUN/SS = 0 0.35 0.7 1.25 µA Oscillator Frequency Normal Operation VFB = 1V 500 550 650 kHz Gate Drive Rise Time CLOAD = 3000pF 40 ns Gate Drive Fall Time CLOAD = 3000pF 40 ns Peak Current Sense Voltage IPRG = GND (Note 6) LTC3872-1E LTC3872-1I LTC3872-1H l l l 90 85 80 105 105 105 120 120 120 mV mV mV IPRG = Float LTC3872-1E LTC3872-1I LTC3872-1H l l l 160 150 145 180 180 180 200 200 200 mV mV mV IPRG = VIN LTC3872-1E LTC3872-1I LTC3872-1H l l l 260 250 240 285 285 285 310 310 310 mV mV mV Default Internal Soft-Start Time 1 ms The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). 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: LTC3872-1TS8: TJ = TA + (PD • 195°C/W) LTC3872-1DDB: TJ = TA + (PD • 76°C/W) Note 4: The dynamic input supply current is higher due to power MOSFET gate charging (QG • fOSC). See Applications Information. Note 5: The LTC3872-1 is tested in a feedback loop which servos VFB to the reference voltage with the ITH pin forced to the midpoint of its voltage range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V). Note 6: Rise and fall times are measured at 10% and 90% levels. elecTrical characTerisTics |
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Similar Description - LTC3787-1 |
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