Datasheet LT1074, LT1076 (Analog Devices) - 7

LT1074/LT1076
W U TYPICAL PERFOR A CE CHARACTERISTICS Reference Voltage vs Supply Current (Shutdown) Temperature Switch “On” Voltage
300 2.25 3.0 2.24 T = 25°C j 250 2.5 2.23 µA) 200 2.22 2.0 LT1074 150 2.21 TAGE (V) TAGE (V) VOL 2.20 1.5 100 “ON” VOL INPUT CURRENT ( 2.19 LT1076 50 1.0 2.18 0 2.17 0.5 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 INPUT VOLTAGE (V) JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) LT1074•TPC13 LT1074•TPC14 LT1074•TPC28
Reference Shift with Ripple Switching Frequency vs Voltage Error Amplifier Phase and GM Temperature
20 8k 200 120 10 7k 150 115 0 6k θ 100 110 TAGE (mV) –10 (µmho) TRI WAVE –20 5k 50 PHASE ( 105 ANCE SQUARE –30 4k 0 100 WAVE GM ° –40 ) 3k –50 95 –50 FREQUENCY (kHz) 2k –100 90 –60 TRANSCONDUCT 1k –150 85 CHANGE IN REFERENCE VOL –70 –80 0 –200 80 0 20 40 60 80 100 120 140 160 180 200 1k 10k 100k 1M 10M –50 –25 0 25 50 75 100 125 150 PEAK-TO-PEAK RIPPLE AT FB PIN (mV) FREQUENCY (Hz) JUNCTION TEMPERATURE (°C) LT1074•TPC16 LT1074•TPC17 LT1074•TPC18
Feedback Pin Frequency Shift Current Limit vs Temperature*
160 8 140 7 I PIN OPEN LIM 120 6 100 5 R = 10k LIM Ω 80 4 150°C 60 –55°C 3 R = 5k LIM Ω 40 2 SWITCHING FREQUENCY (kHz) 25°C OUTPUT CURRENT LIMIT (A) 20 1 *MULTIPLY CURRENTS BY 0.4 FOR LT1076 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 –50 –25 0 25 50 75 100 125 150 FEEDBACK PIN VOLTAGE (V) JUNCTION TEMPERATURE (°C) LT1074•TPC19 LT1074•TPC22 sn1074 1074fds 7