Datasheet LTC7862 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 140V High Efficiency Switching Surge Stopper |
| Pages / Page | 32 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVUV = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Fault Timer and WARNB Output
ISWITCHING TMR Pull-Up Current (Switching) TMR = 0V, VFB = 0.83V l –35 –40 –45 µA IDROPOUT TMR Pull-Down Current (Dropout) TMR = 1V, VFB = 0.77V l 0.7 1.1 1.4 µA ICOOLDOWN TMR Pull-Down Current (Cool-Down) TMR = 2.5V l 0.7 1.1 1.4 µA TMR Switching Off Threshold l 2.13 2.19 2.23 V TMR Retry Threshold 0.19 0.25 0.31 V TMR Switching Set Time 52 55 58 ms/µF (Initial Fault Period) per 1µF TMR Switching Set Time 50 ms/µF (Retry Period) per 1µF TMR Cool-Down Time per 1µF 1700 ms/µF DRETRY Retry Duty Cycle During a Sustained Fault 1.8 2.7 3.5 % VWARNB WARNB Voltage Low IWARNB = 2mA 0.02 0.04 V IWARNB WARNB Leakage Current VWARNB = 3.3V 10 µA tWARNB Delay from TG Going High to WARNB 60 µs Going High Impedance
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC7862 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. The specification at Maximum Ratings for extended periods may affect device reliability and 85°C is not tested in production and is assured by design, characterization lifetime. and correlation to production testing at other temperatures (125°C for the
Note 2:
The LTC7862 is tested under pulsed load conditions such that T LTC7862E and LTC7862I, 150°C for the LTC7862H). For the LTC7862I J ≈ T and LTC7862H, the specification at 0°C is not tested in production and is A. The LTC7862E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction assured by design, characterization and correlation to production testing temperature range are assured by design, characterization and correlation at –40°C. with statistical process controls. The LTC7862I is guaranteed over the
Note 5:
Dynamic supply current is higher due to the gate charge being –40°C to 125°C operating junction temperature range and the LTC7862H delivered at the switching frequency. See the Applications Information is guaranteed over the –40°C to 150°C operating junction temperature section. range. Note that the maximum ambient temperature consistent with
Note 6:
Rise and fall times are measured using 10% and 90% levels. these specifications is determined by specific operating conditions in Delay times are measured using 50% levels. conjunction with board layout, the rated package thermal impedance
Note 7:
The minimum on-time condition is specified for an inductor and other environmental factors. High temperatures degrade operating peak-to-peak ripple current >40% of IMAX (See Minimum On-Time lifetimes; operating lifetime is derated for junction temperatures greater Considerations in the Applications Information section). than 125ºC. The junction temperature (TJ, in °C) is calculated from the
Note 8:
Do not apply a voltage or current source to these pins. They must ambient temperature (TA, in °C) and power dissipation (PD, in Watts) be connected to capacitive loads only, otherwise permanent damage may according to the formula: occur. TJ = TA + (PD • θJA)
Note 9:
The minimum input supply operating range is dependent on the where θJA = 38°C/W for the TSSOP package and θJA = 43°C/W for the DRVCC UVLO thresholds as determined by the DRVUV pin setting. QFN package.
Note 10:
All voltages with respect to GND unless otherwise noted. Positive
Note 3:
This IC includes overtemperature protection that is intended to currents are into pins; negative currents are out of pins unless otherwise protect the device during momentary overload conditions. The maximum noted. rated junction temperature will be exceeded when this protection is active. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability or permanently damage the device. Rev 0 For more information www.analog.com 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS TIMING DIAGRAM FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVUV = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Fault Timer and WARNB Output
ISWITCHING TMR Pull-Up Current (Switching) TMR = 0V, VFB = 0.83V l –35 –40 –45 µA IDROPOUT TMR Pull-Down Current (Dropout) TMR = 1V, VFB = 0.77V l 0.7 1.1 1.4 µA ICOOLDOWN TMR Pull-Down Current (Cool-Down) TMR = 2.5V l 0.7 1.1 1.4 µA TMR Switching Off Threshold l 2.13 2.19 2.23 V TMR Retry Threshold 0.19 0.25 0.31 V TMR Switching Set Time 52 55 58 ms/µF (Initial Fault Period) per 1µF TMR Switching Set Time 50 ms/µF (Retry Period) per 1µF TMR Cool-Down Time per 1µF 1700 ms/µF DRETRY Retry Duty Cycle During a Sustained Fault 1.8 2.7 3.5 % VWARNB WARNB Voltage Low IWARNB = 2mA 0.02 0.04 V IWARNB WARNB Leakage Current VWARNB = 3.3V 10 µA tWARNB Delay from TG Going High to WARNB 60 µs Going High Impedance
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC7862 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. The specification at Maximum Ratings for extended periods may affect device reliability and 85°C is not tested in production and is assured by design, characterization lifetime. and correlation to production testing at other temperatures (125°C for the
Note 2:
The LTC7862 is tested under pulsed load conditions such that T LTC7862E and LTC7862I, 150°C for the LTC7862H). For the LTC7862I J ≈ T and LTC7862H, the specification at 0°C is not tested in production and is A. The LTC7862E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction assured by design, characterization and correlation to production testing temperature range are assured by design, characterization and correlation at –40°C. with statistical process controls. The LTC7862I is guaranteed over the
Note 5:
Dynamic supply current is higher due to the gate charge being –40°C to 125°C operating junction temperature range and the LTC7862H delivered at the switching frequency. See the Applications Information is guaranteed over the –40°C to 150°C operating junction temperature section. range. Note that the maximum ambient temperature consistent with
Note 6:
Rise and fall times are measured using 10% and 90% levels. these specifications is determined by specific operating conditions in Delay times are measured using 50% levels. conjunction with board layout, the rated package thermal impedance
Note 7:
The minimum on-time condition is specified for an inductor and other environmental factors. High temperatures degrade operating peak-to-peak ripple current >40% of IMAX (See Minimum On-Time lifetimes; operating lifetime is derated for junction temperatures greater Considerations in the Applications Information section). than 125ºC. The junction temperature (TJ, in °C) is calculated from the
Note 8:
Do not apply a voltage or current source to these pins. They must ambient temperature (TA, in °C) and power dissipation (PD, in Watts) be connected to capacitive loads only, otherwise permanent damage may according to the formula: occur. TJ = TA + (PD • θJA)
Note 9:
The minimum input supply operating range is dependent on the where θJA = 38°C/W for the TSSOP package and θJA = 43°C/W for the DRVCC UVLO thresholds as determined by the DRVUV pin setting. QFN package.
Note 10:
All voltages with respect to GND unless otherwise noted. Positive
Note 3:
This IC includes overtemperature protection that is intended to currents are into pins; negative currents are out of pins unless otherwise protect the device during momentary overload conditions. The maximum noted. rated junction temperature will be exceeded when this protection is active. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability or permanently damage the device. Rev 0 For more information www.analog.com 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS TIMING DIAGRAM FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
