Datasheet LTC3873 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller |
| Pages / Page | 18 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 267 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC3873
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 9V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Input DC Supply Current Typicals Normal Operation VITH = 1.9V 300 400 µA Shutdown VRUN/SS = 0V 55 100 µA UVLO VCC = UVLO Threshold – 100mV, VRUN/SS = VCC 45 60 µA Undervoltage Lockout Threshold VCC Rising l 7.9 8.4 8.8 V VCC Falling l 3.5 4.0 4.4 V VCC Hysteresis l 4.0 4.4 4.8 V Shutdown Threshold (at RUN/SS) VRUN/SS Falling l 0.5 0.7 0.9 V VRUN/SS Rising 0.6 0.8 1.0 V Regulated Feedback Voltage (Note 5) l 1.182 1.2 1.218 V Feedback Voltage Line Regulation 5.6V < VCC < 9V (Note 5) 0.12 mV/V Feedback Voltage Load Regulation VITH = 1.6V (Note 5) 0.05 % VITH = 1V (Note 5) –0.05 % VFB Input Current (Note 5) 25 50 nA Maximum Duty Cycle 70 78 84 % RUN/SS Pull-Up Current VRUN/SS = 0V 1.5 3 4.5 µA VRUN/SS = 1.3V 5 15 25 µA ISLMAX, Peak Slope Compensation Current 20 µA Oscillator Frequency 160 200 240 kHz Gate Drive Rise Time CLOAD = 3000pF (Note 6) 40 ns Gate Drive Fall Time CLOAD = 3000pF (Note 6) 40 ns Peak Current Sense Voltage IPRG = GND l 95 110 125 mV IPRG = Float l 165 185 210 mV IPRG = VIN l 265 295 325 mV VIN Shunt Regulator Voltage IIN = 1mA, IIN = 25mA, VRUN/SS = 0V l 9 9.3 9.6 V Default Internal Soft-Start 3.3 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The dynamic input supply current is higher due to power MOSFET may cause permanent damage to the device. Exposure to any Absolute gate charging (QG • fOSC). See Applications Information. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3873 is tested in a feedback loop which servos VFB to reliability and lifetime. the reference voltage with the ITH pin forced to the midpoint of its voltage
Note 2:
The LTC3873E is guaranteed to meet performance specifications range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V). from 0°C to 85°C junction temperature. Specifications over the –40°C
Note 6:
Rise and fall times are measured at 10% and 90% levels. to 85°C operating junction temperature range are assured by design, VCC = 5.6V. characterization and correlation with statistical process controls.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA) 3873fb For more information www.linear.com/LTC3873 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 9V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Input DC Supply Current Typicals Normal Operation VITH = 1.9V 300 400 µA Shutdown VRUN/SS = 0V 55 100 µA UVLO VCC = UVLO Threshold – 100mV, VRUN/SS = VCC 45 60 µA Undervoltage Lockout Threshold VCC Rising l 7.9 8.4 8.8 V VCC Falling l 3.5 4.0 4.4 V VCC Hysteresis l 4.0 4.4 4.8 V Shutdown Threshold (at RUN/SS) VRUN/SS Falling l 0.5 0.7 0.9 V VRUN/SS Rising 0.6 0.8 1.0 V Regulated Feedback Voltage (Note 5) l 1.182 1.2 1.218 V Feedback Voltage Line Regulation 5.6V < VCC < 9V (Note 5) 0.12 mV/V Feedback Voltage Load Regulation VITH = 1.6V (Note 5) 0.05 % VITH = 1V (Note 5) –0.05 % VFB Input Current (Note 5) 25 50 nA Maximum Duty Cycle 70 78 84 % RUN/SS Pull-Up Current VRUN/SS = 0V 1.5 3 4.5 µA VRUN/SS = 1.3V 5 15 25 µA ISLMAX, Peak Slope Compensation Current 20 µA Oscillator Frequency 160 200 240 kHz Gate Drive Rise Time CLOAD = 3000pF (Note 6) 40 ns Gate Drive Fall Time CLOAD = 3000pF (Note 6) 40 ns Peak Current Sense Voltage IPRG = GND l 95 110 125 mV IPRG = Float l 165 185 210 mV IPRG = VIN l 265 295 325 mV VIN Shunt Regulator Voltage IIN = 1mA, IIN = 25mA, VRUN/SS = 0V l 9 9.3 9.6 V Default Internal Soft-Start 3.3 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The dynamic input supply current is higher due to power MOSFET may cause permanent damage to the device. Exposure to any Absolute gate charging (QG • fOSC). See Applications Information. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3873 is tested in a feedback loop which servos VFB to reliability and lifetime. the reference voltage with the ITH pin forced to the midpoint of its voltage
Note 2:
The LTC3873E is guaranteed to meet performance specifications range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V). from 0°C to 85°C junction temperature. Specifications over the –40°C
Note 6:
Rise and fall times are measured at 10% and 90% levels. to 85°C operating junction temperature range are assured by design, VCC = 5.6V. characterization and correlation with statistical process controls.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA) 3873fb For more information www.linear.com/LTC3873 3
