Datasheet LTC3565 (Analog Devices) - 3

LTC3565
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 3.6V, RT = 125k unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Input DC Supply Current (Note 4) Active Mode VSYNC/MODE = 3.6V, VFB = 0.55V 330 450 µA Sleep Mode VSYNC/MODE = 3.6V, VFB = 0.8V 40 60 µA Shutdown VRUN = 0V 0.1 1 µA fOSC Oscillator Frequency RT = 125k 1.3 1.5 1.7 MHz (Note 7) 4 MHz fSYNC Synchronization Frequency (Note 7) 0.4 4 MHz ILIM Peak Switch Current Limit VIN = 3V, VFB = 0.5V 1.5 2.1 2.5 A RDS(ON) Top Switch On-Resistance MSE Package 0.15 0.2 Ω DD Package (Note 6) 0.15 Ω Bottom Switch On-Resistance MSE Package 0.13 0.18 Ω DD Package (Note 6) 0.13 Ω ISW(LKG) Switch Leakage Current VIN = 5.5V, VRUN = 0V, VFB = 0V 0.01 1 µA VRUN RUN Threshold l 0.3 0.8 1.5 V IRUN RUN Leakage Current l ±0.01 ±1 µA VUVLO Undervoltage Lockout Threshold VIN Ramping Down 1.9 2.2 V PGOOD Power Good Threshold VFB Ramping Up from 0.45V to 0.6V –7 % VFB Ramping Down from 0.69V to 0.6V 7 % RPGOOD Power Good Pull-Down On-Resistance 15 20 Ω PGOOD Blanking VFB Step from 0V to 0.6V 40 µs VFB Step from 0.6V to 0V 105 µs VSYNC-MODE Pulse Skip VIN = 2.5V to 5.5V 0.6 V Force Continuous VIN = 2.5V to 5.5V 1.2 VIN – 1.1 V Burst VIN = 2.5V to 5.5V VIN – 0.6 V tSOFT-START 10% to 90% of Regulation 0.6 0.9 1.2 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
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 5:
TJ is calculated from the ambient TA and power dissipation PD reliability and lifetime. according to the following formulas:
Note 2:
The LTC3565 is tested under pulsed load conditions such that LTC3565EDD: TJ = T A + (PD • 43°C/W) TJ ≈ TA. The LTC3565E is guaranteed to meet performance specifications LTC3565EMSE: T from 0°C to 85°C junction temperature. Specifications over the –40°C J = T A + (PD • 40°C/W) to 125°C operating junction temperature range are assured by design,
Note 6:
Switch on-resistance is guaranteed by correlation to wafer level characterization and correlation with statistical process controls. The measurements and assured by design characterization and correlation with LTC3565I is guaranteed over the full –40°C to 125°C operating junction statistical process controls. temperature range. Note that the maximum ambient temperature
Note 7:
4MHz operation is guaranteed by design but not production tested consistent with these specifications is determined by specific operating and is subject to duty cycle limitations (see Applications Information). conditions in conjunction with board layout, the rated package thermal
Note 8:
This IC includes overtemperature protection that is intended resistance and other environmental factors. to protect the device during momentary overload conditions. Junction
Note 3:
The LTC3565 is tested in a feedback loop which servos V temperature will exceed 125°C when overtemperature protection is active. FB to the midpoint for the error amplifier (V Continuous operation above the specified maximum operating junction ITH = 0.7V). temperature may impair device reliability. 3565fc For more information www.linear.com/LTC3565 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts