Datasheet LTC3838-1 (Analog Devices) - 8

LTC3838-1
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 –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) 38381 G18 38381 G19 38381 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 I 1.75 LOAD = 0A f = 500kHz 1 1 FREQUENCY NORMALIZED AT TA = 25°C 1.70 (%) (%) 1.65 0 0 1.60 NORMALIZED ∆f NORMALIZED ∆f –1 V TRANSCONDUCTANCE (mS) OUT = 0.6V –1 1.55 ILOAD = 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) 38381 G27 38381 G21 38381 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 90 t 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) 38381 G24 38381 G25 38381 G26 38381fa 8 For more information www.linear.com/3838-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts