Datasheet LT1934, LT1934 (Analog Devices) - 3

LT1934/LT1934-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 10V, VBOOST = 15V, unless otherwise noted. SYMBOL CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 3 3.2 V –40°C ≤ T l A ≤ 85°C 3 3.6 V –40°C ≤ T l 3 3.6 V A ≤ 125°C Quiescent Current VFB = 1.3V 12 22 μA –40°C ≤ T l A ≤ 85°C 12 26 μA –40°C ≤ T l 12 26 μA A ≤ 125°C VSHDN = 0V 0.01 2 μA FB Comparator Trip Voltage VFB Falling –40°C ≤ TA ≤ 85°C l 1.22 1.25 1.27 V –40°C ≤ T l A ≤ 125°C 1.21 1.25 1.27 V FB Comparator Hysteresis 10 mV FB Pin Bias Current VFB = 1.25V –40°C ≤ TA ≤ 85°C l 2 ±15 nA –40°C ≤ T l A ≤ 125°C 2 ±60 nA FB Voltage Line Regulation 4V < VIN < 34V 0.007 %/V Switch Off Time VFB > 1V 1.4 1.8 2.3 μs VFB = 0V 12 μs Maximum Duty Cycle VFB = 1V –40°C ≤ TA ≤ 85°C l 85 88 % –40°C ≤ T l A ≤ 125°C 83 88 % Switch VCESAT ISW = 300mA (LT1934, S6 Package) 200 300 mV ISW = 300mA (LT1934, DCB Package) 225 mV ISW = 75mA (LT1934-1, S6 Package) 65 120 mV ISW = 75mA (LT1934-1, DCB Package) 70 mV Switch Current Limit LT1934 350 400 490 mA LT1934-1 90 120 160 mA BOOST Pin Current ISW = 300mA (LT1934) 8.5 12 mA ISW = 75mA (LT1934-1) 6.0 10 mA Minimum Boost Voltage (Note 3) ISW = 300mA (LT1934) 1.8 2.5 V ISW = 75mA (LT1934-1) 1.7 2.5 V Switch Leakage Current 2 μA SHDN Pin Current VSHDN = 2.3V 0.5 μA VSHDN = 34V 1.5 5 μA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.25 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings operating temperature range are assured by design, characterization and may cause permanent damage to the device. Exposure to any Absolute correlation with statistical process controls. The LT1934I and LT1934I-1 Maximum Rating condition for extended periods may affect device specifi cations are guaranteed over the –40°C to 125°C temperature range. reliability and lifetime.
Note 3:
This is the minimum voltage across the boost capacitor needed to
Note 2:
The LT1934E and LT1934E-1 are guaranteed to meet performance guarantee full saturation of the internal power switch. specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C 1934fe 3