Datasheet LT3971A, LT3971A-5 (Analog Devices) - 3

LT3971A/LT3971A-5
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
VOUT Pin Current VOUT = 5V –0.65 –0.5 –0.38 μA VOUT = 5V l –0.90 –0.5 –0.32 μA VOUT Pin Clamp Voltage IVOUT = –2mA 9 11 13 V Feedback Voltage 1.176 1.192 1.204 V l 1.173 1.19 1.207 V LT3971A-5 Output Voltage 4.94 5.01 5.06 V l 4.93 5 5.07 V FB Voltage Line Regulation 4.3V < VIN < 38V (Note 4) 0.0002 0.01 %/V Switching Frequency RT = 11k 1.8 2.2 2.6 MHz RT = 35.7k 0.8 1 1.2 MHz RT = 255k 160 200 240 kHz Minimum Switch On Time 80 ns Minimum Switch Off Time 110 150 ns Switch Current Limit 2.0 2.5 3.2 A Switch VCESAT ISW = 1A 330 mV Switch Leakage Current 0.02 1 μA Boost Schottky Forward Voltage ISH = 100mA 770 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 1 μA Minimum Boost Voltage (Note 3) VIN = 5V l 1.4 1.8 V BOOST Pin Current ISW = 1A, VBOOST = 15V 20 28 mA EN Voltage Threshold EN Rising l 0.95 1.01 1.07 V EN Voltage Hysteresis 30 mV EN Pin Current 0.2 20 nA LT3971A PG Threshold Offset from VFB VFB Rising 60 100 140 mV LT3971A PG Hysteresis 20 mV LT3971A-5 PG Threshold Offset from VOUT VOUT Rising 5.5 9 12.5 % LT3971A-5 PG Hysteresis 1.3 % PG Leakage VPG = 3V 0.02 1 μA PG Sink Current VPG = 0.4V l 300 570 μA SYNC Threshold 0.6 0.8 1.0 V SYNC Pin Current 0.1 nA SS Source Current VSS = 1V 0.6 1 1.6 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
This is the minimum voltage across the boost capacitor needed to may cause permanent damage to the device. Exposure to any Absolute guarantee full saturation of the switch. Maximum Rating condition for extended periods may affect device
Note 4:
Minimum input voltage depends on application circuit. reliability and lifetime.
Note 2:
The LT3971AI is guaranteed over the full –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. 3971af 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 APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS