Datasheet LTC7802 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| Pages / Page | 34 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. EXTVCC Switchover and INTVCC. INTVCC … |
| File Format / Size | PDF / 3.1 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. EXTVCC Switchover and INTVCC. INTVCC Undervoltage Lockout. INTVCC Load Regulation
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LTC7802
TYPICAL PERFORMANCE CHARACTERISTICS EXTVCC Switchover and INTVCC INTVCC Undervoltage Lockout INTVCC Load Regulation CC Voltage vs Temperature Thresholds vs Temperature CC Thresholds vs T
5.4 5.4 4.4 VIN = 12V VIN = 12V 5.2 5.2 4.3 EXTVCC = 6V INTVCC VOLTAGE RISING 5.0 4.2 EXTVCC = 0V TAGE (V) 5.0 4.8 TAGE (V) VOL 4.1 EXTVCC = 5V V CC 4.8 VOL 4.6 EXTVCC RISING 4.0 V CC FALLING INT 4.6 4.4 OR EXT UVLO THRESHOLD (V) 3.9 V CC EXTVCC FALLING 4.2 INT 4.4 3.8 4.0 4.2 3.7 0 50 100 150 200 250 300 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 INTVCC LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G19 7802 G20 7802 G21
Quiescent Current TRACK/SS Pull-Up Current vs Temperature Shutdown Current vs V IN IN Voltage vs Temperature
40 8.0 15 ONLY CHANNEL 1 ON SLEEP MODE 35 7.0 VIN = 12V 14 30 6.0 13 25 5.0 20 EXTV 155°C 4.0 12 CC = 0V SENSE1– = 0V CURRENT (μA) 15 CURRENT (µA) 3.0 V IN 11 EXTV V IN CC = 0V 125 10 °C SENSE1– = 3.3V 2.0 TRACK/SS CURRENT (μA) 10 5 EXTVCC = 5V 1.0 SENSE1– = 3.3V 25°C –55°C 0 0 9 –55 –25 5 35 65 95 125 155 0 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) VIN VOLTAGE (V) TEMPERATURE (°C) 7802 G22 7802 G23 7802 G24
PIN FUNCTIONS SENSE1+, SENSE2+ (Pins 1,8):
The Positive (+) Input
FREQ (Pin 3):
Frequency Control Pin for the Internal to the Differential Current Comparators. The ITH pin Oscillator. Connect to ground to set the switching fre- voltage and controlled offsets between the SENSE– and quency to 350kHz. Connect to INTVCC to set the switching SENSE+ pins in conjunction with RSENSE set the current frequency to 2.25MHz. Frequencies between 100kHz and trip threshold. 3MHz can be programmed using a resistor between the
SENSE1–, SENSE2– (Pins 2,7):
The Negative (–) Input to FREQ pin and ground. Minimize the capacitance on this pin. the Differential Current Comparators. The SENSE– pins
MODE (Pin 4):
Mode Select Input. This input, which acts supply current to the current comparators when they are on both channels, determines how the LTC7802 operates greater than INTVCC. When SENSE1– is 3.2V or greater, at light loads. Pulling this pin to ground selects Burst it also supplies the majority of the sleep mode quiescent Mode operation. An internal 100k resistor to ground also current instead of VIN, further reducing the input-referred invokes Burst Mode operation when the pin is floating. quiescent current. Rev. 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS EXTVCC Switchover and INTVCC INTVCC Undervoltage Lockout INTVCC Load Regulation CC Voltage vs Temperature Thresholds vs Temperature CC Thresholds vs T
5.4 5.4 4.4 VIN = 12V VIN = 12V 5.2 5.2 4.3 EXTVCC = 6V INTVCC VOLTAGE RISING 5.0 4.2 EXTVCC = 0V TAGE (V) 5.0 4.8 TAGE (V) VOL 4.1 EXTVCC = 5V V CC 4.8 VOL 4.6 EXTVCC RISING 4.0 V CC FALLING INT 4.6 4.4 OR EXT UVLO THRESHOLD (V) 3.9 V CC EXTVCC FALLING 4.2 INT 4.4 3.8 4.0 4.2 3.7 0 50 100 150 200 250 300 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 INTVCC LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G19 7802 G20 7802 G21
Quiescent Current TRACK/SS Pull-Up Current vs Temperature Shutdown Current vs V IN IN Voltage vs Temperature
40 8.0 15 ONLY CHANNEL 1 ON SLEEP MODE 35 7.0 VIN = 12V 14 30 6.0 13 25 5.0 20 EXTV 155°C 4.0 12 CC = 0V SENSE1– = 0V CURRENT (μA) 15 CURRENT (µA) 3.0 V IN 11 EXTV V IN CC = 0V 125 10 °C SENSE1– = 3.3V 2.0 TRACK/SS CURRENT (μA) 10 5 EXTVCC = 5V 1.0 SENSE1– = 3.3V 25°C –55°C 0 0 9 –55 –25 5 35 65 95 125 155 0 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) VIN VOLTAGE (V) TEMPERATURE (°C) 7802 G22 7802 G23 7802 G24
PIN FUNCTIONS SENSE1+, SENSE2+ (Pins 1,8):
The Positive (+) Input
FREQ (Pin 3):
Frequency Control Pin for the Internal to the Differential Current Comparators. The ITH pin Oscillator. Connect to ground to set the switching fre- voltage and controlled offsets between the SENSE– and quency to 350kHz. Connect to INTVCC to set the switching SENSE+ pins in conjunction with RSENSE set the current frequency to 2.25MHz. Frequencies between 100kHz and trip threshold. 3MHz can be programmed using a resistor between the
SENSE1–, SENSE2– (Pins 2,7):
The Negative (–) Input to FREQ pin and ground. Minimize the capacitance on this pin. the Differential Current Comparators. The SENSE– pins
MODE (Pin 4):
Mode Select Input. This input, which acts supply current to the current comparators when they are on both channels, determines how the LTC7802 operates greater than INTVCC. When SENSE1– is 3.2V or greater, at light loads. Pulling this pin to ground selects Burst it also supplies the majority of the sleep mode quiescent Mode operation. An internal 100k resistor to ground also current instead of VIN, further reducing the input-referred invokes Burst Mode operation when the pin is floating. quiescent current. Rev. 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
