Datasheet LT1375, LT1376 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 1.5A, 500kHz Step-Down Switching Regulators |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Pin Bias Current. Standby … |
| File Format / Size | PDF / 518 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Pin Bias Current. Standby and Shutdown Thresholds. Shutdown Supply Current
Model Line for this Datasheet
- LT1375CN8#PBF LT1375CN8-5#PBF LT1375CS8#PBF LT1375CS8#TRPBF LT1375CS8-5#PBF LT1375CS8-5#TRPBF LT1375HVCS8#PBF LT1375HVCS8#TRPBF LT1375HVIS8#PBF LT1375HVIS8#TRPBF LT1375IN8#PBF LT1375IN8-5#PBF LT1375IS8#PBF LT1375IS8#TRPBF LT1375IS8-5#PBF LT1375IS8-5#TRPBF
- LT1376CN8#PBF LT1376CN8-5#PBF LT1376CS#PBF LT1376CS#TRPBF LT1376CS8#PBF LT1376CS8#TRPBF LT1376CS8-5#PBF LT1376CS8-5#TRPBF LT1376HVCS#PBF LT1376HVCS#TRPBF LT1376HVCS8#PBF LT1376HVCS8#TRPBF LT1376HVIS#PBF LT1376HVIS#TRPBF LT1376HVIS8#PBF LT1376HVIS8#TRPBF LT1376IN8#PBF LT1376IN8-5#PBF LT1376IS#PBF LT1376IS#TRPBF LT1376IS8#PBF LT1376IS8#TRPBF LT1376IS8-5#PBF LT1376IS8-5#TRPBF
Text Version of Document
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
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
