Datasheet LT1374 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 4.5A, 500kHz Step-Down Switching Regulator |
| Pages / Page | 32 / 4 — ELECTRICAL CHARACTERISTICS. Note 5:. Note 8:. Note 6:. Note 9:. Note 7:. … |
| File Format / Size | PDF / 720 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. Note 5:. Note 8:. Note 6:. Note 9:. Note 7:. TYPICAL PERFOR A CE CHARACTERISTICS. Switch Voltage Drop
Model Line for this Datasheet
- LT1374CFE#PBF LT1374CFE#TRPBF LT1374CR#PBF LT1374CR#TRPBF LT1374CR-5#PBF LT1374CR-5#TRPBF LT1374CR-5SYNC#PBF LT1374CR-5Sync#TRPBF LT1374CR-SYNC#PBF LT1374CR-Sync#TRPBF LT1374CS8#PBF LT1374CS8#TRPBF LT1374CS8-5#PBF LT1374CS8-5#TRPBF LT1374CS8-5SYNC#PBF LT1374CS8-5Sync#TRPBF LT1374CS8-SYNC#PBF LT1374CS8-Sync#TRPBF LT1374CT7#PBF LT1374CT7-5#PBF LT1374HVCFE#PBF LT1374HVCFE#TRPBF LT1374HVCR#PBF LT1374HVCR#TRPBF LT1374HVCS8#PBF LT1374HVCS8#TRPBF LT1374HVIFE#PBF LT1374HVIFE#TRPBF LT1374HVIR#PBF LT1374HVIR#TRPBF LT1374HVIS8#PBF LT1374HVIS8#TRPBF LT1374IFE#PBF LT1374IFE#TRPBF LT1374IR#PBF LT1374IR#TRPBF LT1374IR-5#PBF LT1374IR-5#TRPBF LT1374IR-5SYNC#PBF LT1374IR-SYNC#PBF LT1374IS8#PBF LT1374IS8#TRPBF LT1374IS8-5#PBF LT1374IS8-5#TRPBF LT1374IS8-5SYNC#PBF LT1374IS8-SYNC#PBF LT1374IT7#PBF LT1374IT7-5#PBF
Text Version of Document
LT1374
ELECTRICAL CHARACTERISTICS Note 5:
Boost current is the current flowing into the boost pin with the pin
Note 8:
Transconductance and voltage gain refer to the internal amplifier held 5V above input voltage. It flows only during switch on time. exclusive of the voltage divider. To calculate gain and transconductance,
Note 6:
V refer to the SENSE pin on the fixed voltage parts. Divide values shown by IN supply current is the current drawn when the BIAS pin is held at 5V and switching is disabled. If the BIAS pin is unavailable or open the ratio VOUT/2.42. circuit, the sum of VIN and BIAS supply currents will be drawn by the VIN
Note 9:
Slope compensation is the current subtracted from the switch pin. current limit at 80% duty cycle. See Maximum Output Load Current in the
Note 7:
Switch on resistance is calculated by dividing V Applications Information section for further details. IN to VSW voltage by the forced current (4.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents.
W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Voltage Drop Switch Peak Current Limit Feedback Pin Voltage
500 6.5 2.430 450 125°C 6.0 400 TYPICAL 2.425 350 5.5 25°C 300 5.0 250 2.420 MINIMUM – 40°C 4.5 200 150 SWITCH VOLTAGE (mV) 4.0 FEEDBACK VOLTAGE (V) 2.415 100 SWITCH PEAK CURRENT (A) 3.5 50 0 3.0 2.410 0 1 2 3 4 5 0 20 40 60 80 100 – 50 –25 0 25 50 75 100 125 SWITCH CURRENT (A) DUTY CYCLE (%) TEMPERATURE (°C) 1374 G18 1374 G02 1374 G03
Shutdown Pin Bias Current Standby and Shutdown Thresholds Shutdown Supply Current
500 2.40 25 VSHDN = 0V CURRENT REQUIRED TO FORCE SHUTDOWN STANDBY 400 (FLOWS OUT OF PIN). AFTER SHUTDOWN, A) 20 CURRENT DROPS TO A FEW µA 2.36 µ 300 A) µ 2.32 15 200 0.8 10 CURRENT ( 8 AT 2.38V STANDBY THRESHOLD START-UP (CURRENT FLOWS OUT OF PIN) SHUTDOWN PIN VOLTAGE (V) 0.4 INPUT SUPPLY CURRENT ( 5 4 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) 1374 G04 1374 G05 1374 G06 1374fd 4
ELECTRICAL CHARACTERISTICS Note 5:
Boost current is the current flowing into the boost pin with the pin
Note 8:
Transconductance and voltage gain refer to the internal amplifier held 5V above input voltage. It flows only during switch on time. exclusive of the voltage divider. To calculate gain and transconductance,
Note 6:
V refer to the SENSE pin on the fixed voltage parts. Divide values shown by IN supply current is the current drawn when the BIAS pin is held at 5V and switching is disabled. If the BIAS pin is unavailable or open the ratio VOUT/2.42. circuit, the sum of VIN and BIAS supply currents will be drawn by the VIN
Note 9:
Slope compensation is the current subtracted from the switch pin. current limit at 80% duty cycle. See Maximum Output Load Current in the
Note 7:
Switch on resistance is calculated by dividing V Applications Information section for further details. IN to VSW voltage by the forced current (4.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents.
W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Voltage Drop Switch Peak Current Limit Feedback Pin Voltage
500 6.5 2.430 450 125°C 6.0 400 TYPICAL 2.425 350 5.5 25°C 300 5.0 250 2.420 MINIMUM – 40°C 4.5 200 150 SWITCH VOLTAGE (mV) 4.0 FEEDBACK VOLTAGE (V) 2.415 100 SWITCH PEAK CURRENT (A) 3.5 50 0 3.0 2.410 0 1 2 3 4 5 0 20 40 60 80 100 – 50 –25 0 25 50 75 100 125 SWITCH CURRENT (A) DUTY CYCLE (%) TEMPERATURE (°C) 1374 G18 1374 G02 1374 G03
Shutdown Pin Bias Current Standby and Shutdown Thresholds Shutdown Supply Current
500 2.40 25 VSHDN = 0V CURRENT REQUIRED TO FORCE SHUTDOWN STANDBY 400 (FLOWS OUT OF PIN). AFTER SHUTDOWN, A) 20 CURRENT DROPS TO A FEW µA 2.36 µ 300 A) µ 2.32 15 200 0.8 10 CURRENT ( 8 AT 2.38V STANDBY THRESHOLD START-UP (CURRENT FLOWS OUT OF PIN) SHUTDOWN PIN VOLTAGE (V) 0.4 INPUT SUPPLY CURRENT ( 5 4 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) 1374 G04 1374 G05 1374 G06 1374fd 4
