Datasheet LT1375, LT1376 (Analog Devices) - 5

LT1375/LT1376
W U TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Pin Bias Current Standby and Shutdown Thresholds Shutdown Supply Current
500 2.40 30 V CURRENT REQUIRED TO FORCE SHUTDOWN SHUTDOWN = 0V STANDBY 400 (FLOWS OUT OF PIN). AFTER SHUTDOWN, 25 CURRENT DROPS TO A FEW µA 2.36 µA) 300 20 µA) 2.32 200 15 0.8 CURRENT ( 8 10 AT 2.38V STANDBY THRESHOLD START-UP (CURRENT FLOWS OUT OF PIN) SHUTDOWN PIN VOLTAGE (V) 0.4 INPUT SUPPLY CURRENT ( 4 5 SHUTDOWN 0 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) INPUT VOLTAGE (V) 1375/76 G04 1375/76 G05 1375/76 G06
Shutdown Supply Current Error Amplifier Transconductance Error Amplifier Transconductance
150 2500 3000 200 PHASE 125 2000 2500 150 µA) µMho) 100 GAIN PHASE (DEG) 1500 2000 100 VIN = 25V µMho) 75 VC 1000 1500 R C OUT OUT GAIN ( 50 V ( FB 2 • 10–3 ) 200k 12pF 50 VIN = 10V INPUT SUPPLY CURRENT ( TRANSCONDUCTANCE ( 500 1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT 0 25 RLOAD = 50Ω 0 0 500 –50 0 0.1 0.2 0.3 0.4 0.5 –50 –25 0 25 50 75 100 125 100 1k 10k 100k 1M 10M SHUTDOWN VOLTAGE (V) JUNCTION TEMPERATURE (°C) FREQUENCY (Hz) 1375/76 G07 1375/76 G02 1375/76 G03
LT1376 Minimum Input Voltage Frequency Foldback Switching Frequency with 5V Output
600 8.5 µA) 500 MINIMUM INPUT VOLTAGE CAN BE 8.0 REDUCED BY ADDING A SMALL EXTERNAL 400 PNP. SEE APPLICATIONS INFORMATION SWITCHING 550 7.5 FREQUENCY 300 7.0 MINIMUM VOLTAGE TO 500 START WITH 6.5 200 STANDARD FREQUENCY (kHz) CIRCUIT INPUT VOLTAGE (V) 6.0 450 100 MINIMUM VOLTAGE FEEDBACK PIN 5.5 TO RUN WITH CURRENT STANDARD CIRCUIT 0 400 5.0 SWITCHING FREQUENCY (kHz) OR CURRENT ( 0 0.5 1.0 1.5 2.0 2.5 –50 –25 0 25 50 75 100 125 0 10 100 1000 FEEDBACK PIN VOLTAGE (V) JUNCTION TEMPERATURE (°C) LOAD CURRENT (mA) 1375/76 G10 1375/76 G11 1375/76 G12 13756fd 5