Datasheet LTC3612 (Analog Devices) - 4

LTC3612
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 = 3.3V, RT/SYNC = SVIN, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Power Good Voltage Windows TRACK/SS = SVIN, Entering Window VFB Ramping Up –3.5 –6 % VFB Ramping Down 3.5 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 LTC3612 is tested under pulsed load conditions such that AVP mode. TJ ≈ TA. The LTC3612E is guaranteed to meet performance specifications
Note 6:
Dynamic supply current is higher due to the internal gate charge from 0°C to 85°C junction temperature. Specifications over the being delivered at the switching frequency. –40°C to 125°C operating junction temperature range are assured by
Note 7:
See description of the TRACK/SS pin in the Pin Functions section. design, characterization and correlation with statistical process controls. The LTC3612I is guaranteed over the full –40°C to 125°C operating
Note 8:
In sourcing mode the average output current is flowing out of SW junction temperature range. The LTC3612H is guaranteed to meet pin. In sinking mode the average output current is flowing into the SW Pin. specifications over the –40°C to 150°C operating temperature range. The
Note 9:
See description of the MODE pin in the Pin Functions section. LTC3612MP is guaranteed and tested to meet specifications over the full
Note 10:
Guaranteed by correlation and design to wafer level –55°C to 150°C operating temperature range. Note that the maximum measurements for QFN packages. ambient temperature consistent with these specifications is determined by
Note 11:
This IC includes overtemperature protection that is intended specific operating conditions in conjunction with board layout, the rated to protect the device during momentary overload conditions. Junction package thermal impedance and other environmental factors. The junction temperature will exceed 150°C when overtemperature protection is active. temperature Continuous operation above the specified maximum operating junction (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and temperature may impair device reliability. power dissipation (PD, in watts) according to the formula: TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal impedance. 3612fc 4 For more information www.linear.com/LTC3612 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Package Description Typical Application Related Parts