Datasheet LTC3605 (Analog Devices) - 3

LTC3605
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PVIN VIN Supply Range 4 15 V IQ Input DC Supply Current (Note 3) Active Mode = 0, RT = 162k 2 5 mA Shutdown VIN =12V, RUN = 0 11 40 µA VFB Feedback Reference Voltage ITH =1.2V (Note 4) –40°C to 85°C l 0.594 0.600 0.606 V ITH =1.2V (Note 4) –40°C to 125°C l 0.592 0.600 0.608 V DVFB(LINE) Feedback Voltage Line VIN = 4V to 15V, ITH = 1.2V, –40°C to 85°C l 0.001 0.02 %/V Regulation VIN = 4V to 15V, ITH = 1.2V, –40°C to 125°C l 0.04 0.1 %/V DVFB(LOAD) Feedback Voltage Load ITH = 0.8V to 1.6V, –40°C to 85°C l 0.1 0.2 % Regulation ITH = 0.8V to 1.6V, –40°C to 125°C l 0.1 0.3 % IFB Feedback Pin Input Current ±30 nA gm (EA) Error Amplifier Transconductance ITH = 1.2V 1.15 1.35 1.6 mS tON(MIN) Minimum On-Time 40 ns tOFF(MIN) Minimum Off-Time 70 ns ILIM Positive Inductor Valley Current Limit VFB = 0.57V 5 6 7.5 A Negative Inductor Valley Current Limit –5 A RTOP Top Power NMOS On-Resistance INTVCC = 3.3V 70 150 mW RBOTTOM Bottom Power NMOS On-Resistance INTVCC = 3.3V 35 55 mW 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 = 2mA) RUN Rising 1.2 1.25 1.3 V Run Threshold 1 (IQ = 400µA) RUN Rising 0.45 0.6 0.75 V VINTVCC Internal VCC Voltage 4V < VIN < 15V 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 1mA Load 12 25 W 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 0.7 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3605 is tested in a feedback loop that adjusts VFB to may cause permanent damage to the device. Exposure to any Absolute achieve a specified error amplifier output voltage (ITH). Maximum Rating condition for extended periods may affect device
Note 5:
TJ is calculated from the ambient temperature TA and reliability and lifetime. Absolute Maximum Ratings are those values beyond power dissipation as follows: TJ = TA + PD • (37°C/W). See Thermal which the life of a device may be impaired. Considerations section.
Note 2:
The LTC3605E is guaranteed to meet performance specifications
Note 6:
This IC includes overtemperature protection that is intended from 0°C to 85°C. Specifications over the –40°C to 85°C operating to protect the device during momentary overload conditions. Junction temperature range are assured by design, characterization and correlation temperature will exceed 125°C when overtemperature protection is active with statistical process controls. The LTC3605I is guaranteed over the full Continuous operation above the specified maximum operating junction –40°C to 125°C operating temperature range. temperature may impair device reliability.
Note 3:
Dynamic supply current is higher due to the internal gate charge being delivered at the switching frequency. 3605fh For more information www.linear.com/LTC3605 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts