Datasheet LTC3605A (Analog Devices) - 3

LTC3605A
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ ≈ TA = 25°C (Note 2). VIN = 12V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ILIM Positive Inductor Valley Current Limit 5 6 7.5 A Negative Inductor Valley Current Limit –5 A RTOP Top Power NMOS On-Resistance INTVCC = 3.3V 70 150 mΩ RBOTTOM Bottom Power NMOS On-Resistance INTVCC = 3.3V 35 60 mΩ VUVLO INTVCC Undervoltage Lockout INTVCC Falling 2.4 2.6 2.8 V Threshold INTVCC Hysteresis (Rising) 0.25 V VRUN Run Threshold 2 (IQ ≥ 1mA) RUN Rising 1.1 1.2 1.3 V Run Threshold 1 (IQ ≥ 100µA) RUN Rising 0.45 0.6 0.75 V VINTVCC Internal VCC Voltage 4V < VIN < 20V 3.2 3.3 3.4 V DVINTVCC INTVCC Load Regulation ILOAD = 0mA to 20mA 0.5 % OV Output Overvoltage VFB Rising 7 10 13 % PGOOD Upper Threshold UV Output Undervoltage VFB Falling –13 –10 –7 % PGOOD Lower Threshold DVFB(HYS) PGOOD Hysteresis VFB Returning 1.5 % RPGOOD PGOOD Pull-Down Resistance 12 25 Ω IPGOOD PGOOD Leakage 0.54V < VFB < 0.66V 2 µA ITRACK/SS TRACK Pull-Up Current 2.5 4 µA fOSC Oscillator Frequency RT = 162k l 0.85 1 1.2 MHz CLKIN CLKIN Threshold CLKIN VIL 0.3 V CLKIN VIH 1 V VVIN_OV VIN Overvoltage Lockout Threshold VIN Rising 22.8 23.5 24.2 V VIN Falling 20.8 21.5 22.1 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Dynamic supply current is higher due to the internal gate charge may cause permanent damage to the device. Exposure to any Absolute being delivered at the switching frequency. Maximum Rating condition for extended periods may affect device
Note 4:
The LTC3605A is tested in a feedback loop that adjusts VFB to reliability and lifetime. Absolute Maximum Ratings are those values achieve a specified error amplifier output voltage (ITH). beyond which the life of a device may be impaired.
Note 5:
TJ is calculated from the ambient temperature TA and
Note 2:
The LTC3605A is tested under pulsed load conditions such that power dissipation as follows: TJ = TA + PD • (37°C/W). See Thermal TJ ≈ TA. The LTC3605AE (E-grade) is guaranteed to meet specifications Considerations section. from 0°C to 85°C junction temperature. Specifications over the –40°C
Note 6:
This IC includes overtemperature protection that is intended to 125°C operating junction temperature range are assured by design, to protect the device during momentary overload conditions. Junction characterization and correlation with statistical process controls. The temperature will exceed 125°C when overtemperature protection is active LTC3605AI (I-grade) is guaranteed over the full –40°C to 125°C operating Continuous operation above the specified maximum operating junction temperature range. temperature may impair device reliability. The junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) according to the formula: TJ = TA + (PD • θJA°C/W) where θJA is the package thermal impedance. Note that the maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated thermal package thermal resistance and other environmental factors. 3605afg For more information www.linear.com/LTC3605A 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts