Datasheet LTC7803 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum |
| Pages / Page | 36 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. EXTV. EXT CC Switchover and INTV. CC … |
| File Format / Size | PDF / 1.6 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. EXTV. EXT CC Switchover and INTV. CC Switchover and INT CC. Maximum Current Sense
Model Line for this Datasheet
- LTC7803EMSE#PBF LTC7803EMSE#TRPBF LTC7803EMSE#WPBF LTC7803EMSE#WTRPBF LTC7803EUD#PBF LTC7803EUD#TRPBF LTC7803EUD#WPBF LTC7803EUD#WTRPBF LTC7803HMSE#PBF LTC7803HMSE#TRPBF LTC7803HMSE#WPBF LTC7803HMSE#WTRPBF LTC7803HUD#PBF LTC7803HUD#TRPBF LTC7803HUD#WPBF LTC7803HUD#WTRPBF LTC7803IMSE#PBF LTC7803IMSE#TRPBF LTC7803IMSE#WPBF LTC7803IMSE#WTRPBF LTC7803IUD#PBF LTC7803IUD#TRPBF LTC7803IUD#WPBF LTC7803IUD#WTRPBF LTC7803JMSE#PBF LTC7803JMSE#TRPBF LTC7803JMSE#WPBF LTC7803JMSE#WTRPBF LTC7803JUD#PBF LTC7803JUD#TRPBF LTC7803JUD#WPBF LTC7803JUD#WTRPBF
Text Version of Document
LTC7803
TYPICAL PERFORMANCE CHARACTERISTICS EXTV EXT CC Switchover and INTV CC Switchover and INT CC Maximum Current Sense Maximum Current Sense SENSE pin Input Current vs CC SENSE Pin Input Current Voltage vs Temperature oltages vs Temperature Threshold vs ITH Voltage VSENSE vs V Voltage SENSE Voltage
5.8 60 800 750 5.6 50 700 PULSE–SKIPPING MODE 5.4 40 650 INTV TAGE (mV) 600 CC BURST MODE 5.2 SENSE– PIN 30 OPERATION 550 5.0 500 TAGE (V) 20 450 4.8 EXTVCC RISING 400 VOL 10 350 4.6 V CC 300 0 INT 4.4 250 SENSE CURRENT (µA) EXTVCC FALLING 200 4.2 –10 150 4.0 –20 100 MAXIMUM CURRENT SENSE VOL FORCED CONTINUOUS MODE 50 SENSE+ PIN 3.8 –30 0 –55 25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) ITH VOLTAGE (V) VSENSE COMMON MODE VOLTAGE (V) 7803 G19 7803 G20 7803 G21
SENSE Pin Input Current SENSE Pin Input Current SENSE Pin Input Current vs I SENSE Pin Input Current TH Foldback Current Limit vs Temperature vs T Voltage vs ITH Voltage Foldback Current Limit
800 800 70 750 SENSE– = 12V 750 700 700 60 650 650 600 600 SENSE−=12V 550 550 50 500 500 450 450 40 400 400 350 350 30 300 300 SENSE+ PIN SENSE+ PIN 250 SENSE CURRENT (µA) 250 200 SENSE CURRENT (µA) 200 SENSE– < 2.9V 20 SENSE– < 2.9V 150 150 100 10 SENSE– = 3.2V 100 SENSE– = 3.2V 50 50 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 100 200 300 400 500 600 700 800 TEMPRATURE (°C) ITH VOLTAGE (V) FEEDBACK VOLTAGE (mV) 7803 G22 7803 G23 7803 G24
Oscillator Frequency vs Oscillator Frequency Charge Pump Charging Current Charge Pump Charging Current vs Charge Pump Charging Current Temperature vs Temperature vs Operating Frequency Switch Voltage vs Switch Voltage
7 100 100 RFREQ=374k(100kHz) V V 6 SW = 12V BOOST – VSW = 4V R 90 FREQ=75k(500kHz) 5 90 V R BOOST – VSW = 4V FREQ=12.5k(3MHz) T = 155°C 80 4 RFREQ=GND(375kHz) FREQ = GND R 80 FREQ=INTVCC(2.25MHz) 70 3 2 T = 25°C 70 60 FREQ = INTV 1 CC 50 0 60 40 –1 50 30 –2 T = –55°C CHANGE IN FREQUENCY (%) 20 –3 40 –4 10 CHARGE PUMP CHARGING CURRENT (µA) CHARGE PUMP CHARGING CURRENT (µA) –5 30 0 –55 –25 5 35 65 95 125 155 0 600 1200 1800 2400 3000 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) OPERATING FREQUENCY (kHz) SWITCH VOLTAGE (V) 7803 G25 7803 G26 7803 G27 Rev 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS EXTV EXT CC Switchover and INTV CC Switchover and INT CC Maximum Current Sense Maximum Current Sense SENSE pin Input Current vs CC SENSE Pin Input Current Voltage vs Temperature oltages vs Temperature Threshold vs ITH Voltage VSENSE vs V Voltage SENSE Voltage
5.8 60 800 750 5.6 50 700 PULSE–SKIPPING MODE 5.4 40 650 INTV TAGE (mV) 600 CC BURST MODE 5.2 SENSE– PIN 30 OPERATION 550 5.0 500 TAGE (V) 20 450 4.8 EXTVCC RISING 400 VOL 10 350 4.6 V CC 300 0 INT 4.4 250 SENSE CURRENT (µA) EXTVCC FALLING 200 4.2 –10 150 4.0 –20 100 MAXIMUM CURRENT SENSE VOL FORCED CONTINUOUS MODE 50 SENSE+ PIN 3.8 –30 0 –55 25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) ITH VOLTAGE (V) VSENSE COMMON MODE VOLTAGE (V) 7803 G19 7803 G20 7803 G21
SENSE Pin Input Current SENSE Pin Input Current SENSE Pin Input Current vs I SENSE Pin Input Current TH Foldback Current Limit vs Temperature vs T Voltage vs ITH Voltage Foldback Current Limit
800 800 70 750 SENSE– = 12V 750 700 700 60 650 650 600 600 SENSE−=12V 550 550 50 500 500 450 450 40 400 400 350 350 30 300 300 SENSE+ PIN SENSE+ PIN 250 SENSE CURRENT (µA) 250 200 SENSE CURRENT (µA) 200 SENSE– < 2.9V 20 SENSE– < 2.9V 150 150 100 10 SENSE– = 3.2V 100 SENSE– = 3.2V 50 50 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 100 200 300 400 500 600 700 800 TEMPRATURE (°C) ITH VOLTAGE (V) FEEDBACK VOLTAGE (mV) 7803 G22 7803 G23 7803 G24
Oscillator Frequency vs Oscillator Frequency Charge Pump Charging Current Charge Pump Charging Current vs Charge Pump Charging Current Temperature vs Temperature vs Operating Frequency Switch Voltage vs Switch Voltage
7 100 100 RFREQ=374k(100kHz) V V 6 SW = 12V BOOST – VSW = 4V R 90 FREQ=75k(500kHz) 5 90 V R BOOST – VSW = 4V FREQ=12.5k(3MHz) T = 155°C 80 4 RFREQ=GND(375kHz) FREQ = GND R 80 FREQ=INTVCC(2.25MHz) 70 3 2 T = 25°C 70 60 FREQ = INTV 1 CC 50 0 60 40 –1 50 30 –2 T = –55°C CHANGE IN FREQUENCY (%) 20 –3 40 –4 10 CHARGE PUMP CHARGING CURRENT (µA) CHARGE PUMP CHARGING CURRENT (µA) –5 30 0 –55 –25 5 35 65 95 125 155 0 600 1200 1800 2400 3000 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) OPERATING FREQUENCY (kHz) SWITCH VOLTAGE (V) 7803 G25 7803 G26 7803 G27 Rev 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Typical Application Related Parts
