Datasheet LTC3614 (Analog Devices) - 4

LTC3614
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 3.3V, RT/SYNC = SVIN unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VMODE Internal Burst Mode Operation 0.3 V (Note 9) Pulse-Skipping Mode SVIN – 0.3 V Forced Continuous Mode 1.1 SVIN • 0.58 V External Burst Mode Operation 0.45 0.8 V PGOOD Power Good Voltage Windows TRACK/SS = SVIN, Entering Window VFB Ramping Up –3 –6 % VFB Ramping Down 3 6 % TRACK/SS = SVIN, Leaving Window VFB Ramping Up 9 11 % VFB Ramping Down –9 –11 % tPGOOD Power Good Blanking Time Entering and Leaving Window 70 105 140 µs RPGOOD Power Good Pull-Down On-Resistance 8 17 33 Ω VRUN RUN voltage Input High l 1 V Input Low l 0.4 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
This parameter is tested in a feedback loop which servos VFB to may cause permanent damage to the device. Exposure to any Absolute the midpoint for the error amplifier (VITH = 0.75V). Maximum Rating condition for extended periods may affect device
Note 4:
External compensation on ITH pin. reliability and lifetime.
Note 5:
Tying the ITH pin to SVIN enables the internal compensation and
Note 2:
The LTC3614 is tested under pulsed load conditions such that TJ ≈ AVP mode. TA. The LTC3614E is guaranteed to meet specifications from 0°C to 85°C
Note 6:
Dynamic supply current is higher due to the internal gate charge junction temperature. Specifications over the –40°C to 125°C operating being delivered at the switching frequency. junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3614I is guaranteed
Note 7:
See description of the TRACK/SS pin in the Pin Functions section. to meet specifications over the –40°C to 125°C operating junction
Note 8:
In sourcing mode the average output current is flowing out of the temperature, the LTC3614H is guaranteed to meet specifications over the SW pin. In sinking mode the average output current is flowing into the SW –40°C to 150°C operating junction temperature range and the LTC3614MP Pin. is guaranteed and tested to meet specifications over the full –55°C to
Note 9:
See description of the MODE pin in the Pin Functions section. 150°C operating junction temperature range. High junction temperatures
Note 10:
Guaranteed by correlation and design to wafer level degrade operating lifetimes; operating lifetime is derated for temperature measurements for QFN packages. greater than 125°C. Note that the maximum ambient temperature
Note 11:
This IC includes overtemperature protection that is intended consistent with these specifications is determined by specific operating to protect the device during momentary overload conditions. Junction conditions in conjunction with board layout, the rated package thermal temperature will exceed 150°C when overtemperature protection is active. impedance and other environmental factors. Continuous operation above the specified maximum operating junction The junction temperature (TJ) is calculated from the ambient temperature temperature may impair device reliability. (TA) and power dissipation (PD) according to the formula: TJ = TA + (PD • θJA°C/W), where θJA is the package thermal impedance. The maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. 3614fc 4 For more information www.linear.com/LTC3614 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Package Description Typical Application Related Parts