Datasheet LTC3606B (Analog Devices) - 3

LTC3606B
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C, VIN = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN VIN Operating Voltage Range l 2.5 5.5 V VUV VIN Undervoltage Lockout VIN Low to High l 2.1 2.5 V IFB Feedback Pin Input Current l ±30 nA VFBREG Feedback Voltage LTC3606BE, –40°C < TJ < 85°C (Note 7) l 0.588 0.600 0.612 V LTC3606BI, –40°C < TJ < 125°C (Note 7) l 0.582 0.600 0.618 V VLINEREG VFB Line Regulation VIN = 2.5V to 5.5V (Note 7) 0.01 0.25 %/V VLOADREG VFB Load Regulation ILOAD = 0mA to 800mA (Note 7) 0.5 % IS Supply Current Active Mode (Note 4) VFB = 0.95 × VFBREG 420 650 μA Shutdown VRUN = 0V, VIN = 5.5V 1 μA fOSC Oscillator Frequency VFB = VFBREG l 1.8 2.25 2.7 MHz ILIM(PEAK) Peak Switch Current Limit VIN = 5V, VFB < VFBREG, Duty Cycle <35% 1800 2400 mA IINLIM Input Average Current Limit RLIM = 116k 450 475 500 mA RLIM = 116k, LTC3606BE l 437 475 513 mA RLIM = 116k, LTC3606BI l 427 475 523 mA RDS(ON) Main Switch On-Resistance (Note 5) VIN = 5V, ISW = 100mA 0.27 Ω Synchronous Switch On-Resistance (Note 5) VIN = 5V, ISW = 100mA 0.25 Ω ISW(LKG) Switch Leakage Current VIN = 5V, VRUN = 0V 0.01 1 μA tSOFTSTART Soft-Start Time VFB from 0.06V to 0.54V 0.3 0.95 1.3 ms VRUN RUN Threshold High l 0.4 1 1.2 V IRUN RUN Leakage Current 0V ≤ VRUN ≤ 5V l 0.01 1 μA PGOOD Power Good Threshold Entering Window VFB Ramping Up –5 –7 % VFB Ramping Down 5 7 % Leaving Window VFB Ramping Up 9 11 % VFB Ramping Down –9 –11 % PGOOD Blanking Power Good Blanking Time PGOOD Rising and Falling, VIN = 5V 90 μs RPGOOD Power Good Pull-Down On-Resistance 8 15 30 Ω IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
The switch on-resistance is guaranteed by correlation to wafer may cause permanent damage to the device. Exposure to any Absolute level measurements. Maximum Rating condition for extended periods may affect device
Note 6:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
Guaranteed by long term current density limitations. temperature will exceed 125°C when overtemperature protection is active.
Note 3:
The LTC3606BE is guaranteed to meet performance specifi cations Continuous operation above the specifi ed maximum operating junction from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature may impair device reliability. junction temperature range are assured by design, characterization and
Note 7:
The converter is tested in a proprietary test mode that connects correlation with statistical process controls. The LTC3606BI is guaranteed the output of the error amplifi er to the SW pin, which is connected to an to meet specifi ed performance over the full –40°C to 125°C operating external servo loop. junction temperature range.
Note 8:
TJ is calculated from the ambient temperature TA and the power
Note 4:
Dynamic supply current is higher due to the internal gate charge dissipation as follows: TJ = TA + (PD)(θJA°C/W) being delivered at the switching frequency. 3606bfb 3