Datasheet LTC3838 (Analog Devices) - 8

LTC3838
Typical perForMance characTerisTics Output Regulation Output Regulation Output Regulation vs Input Voltage vs Load Current vs Temperature
0.2 0.2 0.6 VOUT = 0.6V VIN = 15V VIN = 15V ILOAD = 5A VOUT = 0.6V VOUT = 0.6V VOUT NORMALIZED AT VIN = 15V VOUT NORMALIZED AT ILOAD = 4A 0.4 ILOAD = 0A 0.1 0.1 VOUT NORMALIZED AT TA = 25°C (%) (%) (%) 0.2 OUT OUT OUT 0 0 0 –0.2 NORMALIZED ∆V –0.1 NORMALIZED ∆V –0.1 NORMALIZED ∆V –0.4 CHANNEL 1 CHANNEL 1 CHANNEL 1 CHANNEL 2 CHANNEL 2 CHANNEL 2 –0.2 –0.2 –0.6 0 5 10 15 20 25 30 35 40 0 2 4 6 8 10 –50 –25 0 25 50 75 100 125 150 VIN (V) ILOAD (A) TEMPERATURE (°C) 3838 G18 3838 G19 3838 G20
Error Amplifier Transconductance CLKOUT/Switching Frequency CLKOUT/Switching Frequency vs Temperature vs Input Voltage vs Temperature
1.80 2 2 VIN = 15V, VOUT = 0.6V ILOAD = 0A 1.75 f = 500kHz 1 1 FREQUENCY NORMALIZED AT TA = 25°C 1.70 (%) (%) 1.65 0 0 1.60 NORMALIZED ∆f NORMALIZED ∆f –1 VOUT = 0.6V –1 TRANSCONDUCTANCE (mS) I 1.55 LOAD = 5A f = 500kHz FREQUENCY NORMALIZED AT VIN = 15V 1.50 –2 –2 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 3838 G27 3838 G21 3838 G23
tON(MIN) and tOFF(MIN) tON(MIN) and tOFF(MIN) tON(MIN) and tOFF(MIN) vs VOUT (Voltage on SENSE– Pin) vs Voltage on VIN Pin vs Switching Frequency
100 100 100 90 t 90 90 OFF(MIN) tOFF(MIN) tOFF(MIN) 80 80 80 70 70 70 60 60 60 50 50 50 tON(MIN) tON(MIN) TIME (ns) 40 TIME (ns) 40 TIME (ns) 40 t 30 30 30 ON(MIN) 20 20 20 10 VIN = 38V 10 VOUT = 0.6V 10 VIN = 38V RT ADJUSTED FOR fCLKOUT = 2MHz RT ADJUSTED FOR fCLKOUT = 2MHz VOUT = 0.6V 0 0 0 0 1 2 3 4 5 6 0 5 10 15 20 25 30 35 40 200 500 800 1100 1400 1700 2000 V – SENSE (V) VIN (V) CLKOUT/SWITCHING FREQUENCY (kHz) 3838 G24 3838 G25 3838 G26 3838fb 8 For more information www.linear.com/LTC3838 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts