Datasheet LT3970 (Analog Devices) - 4

LT3970 Series
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage l 4 4.2 V Quiescent Current from VIN VEN Low 0.7 1.2 µA VEN High 1.7 2.7 µA VEN High, –40°C to 125°C l 3.5 µA VEN High, –40°C to 150°C l 4 µA LT3970 Feedback Voltage 1.195 1.21 1.225 V –40°C to 125°C l 1.185 1.21 1.235 V –40°C to 150°C l 1.18 1.21 1.235 V LT3970-3.3 Output Voltage 3.26 3.3 3.34 V –40°C to 125°C l 3.234 3.3 3.366 V –40°C to 150°C l 3.217 3.3 3.366 V LT3970-3.42 Output Voltage 3.379 3.42 3.461 V –40°C to 125°C l 3.352 3.42 3.488 V LT3970-5 Output Voltage 4.94 5 5.06 V –40°C to 125°C l 4.9 5 5.1 V –40°C to 150°C l 4.875 5 5.1 V LT3970 FB Pin Bias Current (Note 3) VFB = 1.21V l 0.1 20 nA FB/Output Voltage Line Regulation 4.2V < VIN < 40V 0.0002 0.01 %/V Switching Frequency RT = 41.2k, VIN = 6V 1.76 2.25 2.64 MHz RT = 158k, VIN = 6V 640 800 960 kHz RT = 768k, VIN = 6V 160 200 240 kHz Switch Current Limit VIN = 5V, VFB = 0V 535 700 865 mA Catch Schottky Current Limit VIN = 5V 350 400 500 mA Switch VCESAT ISW = 200mA 175 mV Switch Leakage Current 0.05 2 µA Catch Schottky Forward Voltage ISCH = 100mA, VIN = VBD = NC 650 mV Catch Schottky Reverse Leakage VSW = 12V 0.05 2 µA Boost Schottky Forward Voltage ISCH = 50mA, VIN = NC, VBOOST = 0V 875 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 2 µA Minimum Boost Voltage (Note 4) VIN = 5V l 1.4 1.8 V BOOST Pin Current ISW = 200mA, VBOOST = 15V 7 10 mA EN Pin Current VEN = 12V 1 30 nA LT3970 EN Voltage Threshold EN Rising, VIN ≥ 4.2V l 0.94 1 1.06 V LT3970-X EN Voltage Threshold EN Rising, VIN ≥ 4.2V l 0.93 1 1.07 V EN Voltage Hysteresis 30 mV LT3970 PG Threshold Offset from Feedback Voltage VFB Rising 80 120 160 mV LT3970 PG Hysteresis 12 mV LT3970-X PG Threshold Offset from Output Voltage VFB Rising 6.5 10 13.5 % LT3970-X PG Hysteresis as % of Output Voltage 1.0 % PG Leakage VPG = 3V 0.01 1 µA PG Sink Current VPG = 0.4V l 30 80 µA Minimum Switch On-Time 90 ns Minimum Switch Off-Time VIN = 10V l 100 160 ns Rev. D 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts