Datasheet LT3507A (Analog Devices) - 4

LT3507A
electrical characteristics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1, VIN2, VIN3 = 12V, VBOOST1, VBOOST2, VBOOST3 = 17V, unless otherwise noted (Notes 2, 7) PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch 1 Current Limit (Note 3) Duty Cycle = 15% l 4.3 5.1 6 A Switch 1 VCESAT ISW1 = 2A (Note 6) 400 600 mV BOOST1 Operating Current ISW1 = 2A 40 60 mA
Converter 2
VC2 to Switch Current Gain 4.3 A/V Switch 2 Current Limit (Note 3) Duty Cycle = 15% l 2.7 3.3 4 A Switch 2 VCESAT ISW2 = 1.5A (Note 6) 350 500 mV BOOST2 Operating Current ISW2 = 1.5A 40 60 mA
Converter 3
VC3 to Switch Current Gain 4.3 A/V Switch 3 Current Limit (Note 3) Duty Cycle = 15% l 2.7 3.3 4 A Switch 3 VCESAT ISW3 = 1.5A (Note 6) 350 500 mV BOOST3 Operating Current ISW3 = 1.5A 40 60 mA
LDO Regulator
Feedback Pin Voltage l 788 800 812 mV Feedback Pin Bias Current –150 –500 nA Error Amplifier Voltage Gain 1100 V/V Line Regulation VIN from 5V to 36V 0.05 %/V Load Regulation IDRIVE from 0.1mA to 10mA 0.005 %/mA DRIVE Output Current Limit l 10 15 22.5 mA Dropout Voltage, VIN1 to DRIVE IDRIVE = 10mA, VIN = 5V 1.7 2.0 V Dropout Voltage, BIAS to DRIVE IDRIVE = 10mA, VIN = 5V 0.5 0.8 V
Over/Undervoltage Lockout
Undervoltage Lockout Threshold 1.15 1.20 1.25 V Overvoltage Lockout Threhold 1.15 1.20 1.25 V Undervoltage Lockout Hysteresis Current V(UVLO) < 1.2V 7 10 13 µA Overvoltage Lockout Hysteresis Current V(OVLO) > 1.2V –7 –10 –13 µA Input Bias Current (OVLO and UVLO) V(OVLO) = 1.0V, V(UVLO) = 1.5V –100 –200 nA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current limit is guaranteed by design and/or correlation to static may cause permanent damage to the device. Exposure to any Absolute test. Slope compensation reduces current limit at higher duty cycles. Maximum Rating condition for extended periods may affect device
Note 4:
This is the minimum voltage across the boost capacitor needed to reliability and lifetime. guarantee full saturation of the internal power switch.
Note 2:
The LT3507AE is guaranteed to meet performance specifications
Note 5:
This IC includes overtemperature protection that is intended from 0°C to 125°C junction temperature. Specifications over the –40°C to protect the device during momentary overload conditions. to 125°C operating junction temperature range are assured by design, Junction temperature will exceed the maximum operating range when characterization and correlation with statistical process controls. The overtemperature protection is active. Continuous operation above the LT3507AI is guaranteed to meet performance specifications from –40°C specified maximum operating junction temperature may impair device to 125°C junction temperature. The LT3507AH is guaranteed over the reliability. full –40°C to 150°C operating junction temperature range. High junction
Note 6:
Switch V temperatures degrade operating lifetimes. Operating lifetime is derated at CESAT for the FE package is guaranteed by design and/or correlation to static test. junction temperatures greater than 125°C.
Note 7:
Positive currents flow into pins, negative currents flow out of pins. Minimum and maximum specifications refer to absolute values. 3507afa 4 For more information www.linear.com/LT3507A 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 Applications Package Description Package Description Typical Applications Related Parts