Datasheet LT3976 (Analog Devices) - 4

LT3976
elecTrical characTerisTics Note 3:
Minimum input voltage depends on application circuit.
Note 6:
This IC includes overtemperature protection that is intended
Note 4:
The LT3976 contains circuitry that extends the maximum duty to protect the device during momentary overload conditions. Junction cycle if there is sufficient voltage across the boost capacitor. See the temperature will exceed the maximum operating junction temperature Application Information section for more details. when overtemperature protection is active. Continuous operation above
Note 5:
This is the minimum voltage across the boost capacitor needed to the specified maximum operating junction temperature may impair device guarantee full saturation of the switch. reliability or permanently damage the device.
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency at 5VOUT
100 100 100 fSW = 800kHz FRONT PAGE APPLICATION f 95 SW = 800kHz VOUT = 5V 95 VOUT = 3.3V 90 VOUT = 5V 90 90 80 85 85 70 80 80 60 75 75 50 70 70 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 65 30 60 12V 60 12V 20 12V 55 24V 55 24V 10 24V 36V 36V 36V 50 50 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.01 0.1 1 10 100 1000 10000 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (mA) 3976 G01 3976 G02 3976 G03
Efficiency at 3.3VOUT No-Load Supply Current No-Load Supply Current
100 8 10000 FRONT PAGE APPLICATION IN REGULATION FRONT PAGE APPLICATION 90 VOUT = 3.3V 7 VOUT = 3.3V VIN = 12V V 80 OUT = 3.3V 6 1000 70 DUE TO 60 5 CATCH DIODE 50 4 100 LEAKAGE 40 EFFICIENCY (%) 3 30 INPUT CURRENT (µA) INPUT CURRENT (µA) 2 10 20 12V 10 24V 1 36V 0 0 1 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 LOAD CURRENT (mA) INPUT VOLTAGE (V) TEMPERATURE (°C) 3976 G04 3976 G05 3876 G06 3976f 4 For more information www.linear.com/3976 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 Typical Application Related Parts