Datasheet LTC3105 (Analog Devices) - 3

LTC3105
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VAUX = VOUT = 3.3V, VLDO = 2.2V, VIN = 0.6V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Step-Up Converter
Input Operating Voltage l 0.225 5 V Input Start-Up Voltage (Note 5) l 0.25 0.4 V TJ = 0°C to 85°C (Note 5) 0.36 V Output Voltage Adjust Range l 1.6 5.25 V Feedback Voltage (FB Pin) l 0.984 1.004 1.024 V VOUT IQ in Operation VFB = 1.10V 24 µA VOUT IQ in Shutdown SHDN = 0V 10 µA MPPC Pin Output Current VMPPC = 0.6V 9.72 10 10.28 µA SHDN Input Logic High Voltage l 1.1 V SHDN Input Logic Low Voltage l 0.3 V N-Channel SW Pin Leakage Current VIN = VSW = 5V, VSHDN = 0V 1 10 µA P-Channel SW Pin Leakage Current VIN = VSW = 0V, VOUT = VAUX = 5.25V 1 10 µA N-Channel On-Resistance: SW to GND 0.5 Ω P-Channel On-Resistance: SW to VOUT 0.5 Ω Peak Current Limit VFB = 0.90V, VMPPC = 0.4V (Note 3) 0.4 0.5 A Valley Current Limit VFB = 0.90V, VMPPC = 0.4V (Note 3) 0.275 0.35 A PGOOD Threshold (% of Feedback Voltage) VOUT Falling 85 90 95 %
LDO Regulator
LDO Output Adjust Range External Feedback Network, VAUX > VLDO l 1.4 5 V LDO Output Voltage VFBLDO = 0V l 2.148 2.2 2.236 V Feedback Voltage (FBLDO Pin) External Feedback Network l 0.984 1.004 1.024 V Load Regulation ILDO = 1mA to 6mA 0.40 % Line Regulation VAUX = 2.5V to 5V 0.15 % Dropout Voltage ILDO = 6mA, VOUT = VAUX = 2.2V 105 mV LDO Current Limit VLDO 0.5V Below Regulation Voltage l 6 12 mA LDO Reverse-Blocking Leakage Current VIN = VAUX = VOUT = 0V, VSHDN = 0V 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current measurements are performed when the LTC3105 is not may cause permanent damage to the device. Exposure to any Absolute switching. The current limit values measured in operation will be somewhat Maximum Rating condition for extended periods may affect device higher due to the propagation delay of the comparators. reliability and lifetime.
Note 4:
This IC includes over temperature protection that is intended
Note 2:
The LTC3105 is tested under pulsed load conditions such that to protect the device during momentary overload conditions. Junction TJ ≈ TA. The LTC3105E is guaranteed to meet specifications from temperature will exceed 125°C when overtemperature protection is active. 0°C to 85°C junction temperature. Specifications over the –40°C to 85°C Continuous operation above the specified maximum operating junction operating junction temperature range are assured by design, character- temperature may impair device reliability. ization and correlation with statistical process controls. Note that the
Note 5:
The LTC3105 has been optimized for use with high impedance maximum ambient temperature consistent with these specifications is power sources such as photovoltaic cells and thermoelectric generators. determined by specific operating conditions in conjunction with board The input start-up voltage is measured using an input voltage source with layout, the rated package thermal impedance and other environmental a series resistance of approximately 200mΩ and MPPC enabled. Use of the factors. LTC3105 with lower resistance voltage sources or with MPPC disabled may result in a higher input start-up voltage. 3105fb For more information www.linear.com/LTC3105 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts