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LTC3891 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3891 Datasheet(HTML) 5 Page - Linear Technology |
5 / 40 page LTC3890-2 5 38902f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS PGOOD1 and PGOOD2 Outputs VPGL PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative Hysteresis –13 –10 2.5 –7 % % VFB with Respect to Set Regulated Voltage VFB Ramping Positive Hysteresis 710 2.5 13 % % tPG Delay for Reporting a Fault 25 μs Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Ratings for extended periods may affect device reliability and lifetime. Note 2: The LTC3890-2 is tested under pulsed load conditions such that TJ ≈ TA. The LTC3890E-2 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3890I-2 is guaranteed over the –40°C to 125°C operating junction temperature range, the LTC3890H-2 is guaranteed over the –40°C to 150°C operating junction temperature range and the LTC3890MP-2 is tested and guaranteed over the –55°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. Note that 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. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 34°C/W) Note 4: The LTC3890-2 is tested in a feedback loop that servos VITH1,2 to a specified voltage and measures the resultant VFB. The specification at 85°C is not tested in production and is assured by design, characterization and correlation to production testing at other temperatures (125°C for the LTC3890E-2/ LTC3890I-2, 150°C for the LTC3890H-2/LTC3890MP-2). For the LTC3890MP-2, the specification at –40°C is not tested in production and is assured by design, characterization and correlation to production testing at –55°C. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications information. Note 6: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 7: The minimum on-time condition is specified for an inductor peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time Considerations in the Applications Information section). |
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