Datasheet LTC3852 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| Páginas / Página | 32 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Controller Oscillator Frequency. … |
| Formato / tamaño de archivo | PDF / 429 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Controller Oscillator Frequency. Controller Undervoltage Lockout
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LTC3852
TYPICAL PERFORMANCE CHARACTERISTICS Controller Oscillator Frequency Controller Undervoltage Lockout Shutdown Input DC Supply Current vs Temperature Threshold (INTVCC) vs Temperature vs Input Voltage Controller Only
900 5 40 800 R 35 FREQ = 36k 4 INTVCC RAMPING UP 30 700 3 25 INTV 600 CC RAMPING DOWN RFREQ = 60k 20 500 2 15 FREQUENCY (kHz) 400 10 VOLTAGE AT UVLO THRESHOLD (V) 1 300 R CC FREQ = 160k SHUTDOWN SUPPLY CURRENT (μA) 5 INTV 200 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 3852 G22 3852 G24 3852 G25
Shutdown Input DC Supply Current Input DC Supply Current Maximum Current Sense vs Temperature Controller Only vs Temperature Controller Only Threshold vs INTVCC Voltage
40 3.0 90 35 80 2.5 30 70 2.0 60 25 50 20 1.5 40 15 1.0 30 10 20 0.5 5 INPUT DC SUPPLY CURRENT (mA) CURRENT SENSE THRESHOLD (mV) 10 SHUTDOWN INPUT DC SUPPLY CURRENT (μA) 0 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 TEMPERATURE (°C) TEMPERATURE (°C) INTVCC VOLTAGE(V) 3852 G26 3852 G27 3852 G28
Charge Pump Oscillator Charge Pump Oscillator Charge Pump SHDN Threshold Frequency vs Supply Voltage Frequency vs Temperature Voltage vs Supply Voltage
1.50 1.4 0.9 V 1.25 1.3 IN = 4.5V LOW-TO-HIGH THRESHOLD 0.8 1.00 1.2 TAGE (V) 0.75 1.1 VIN = 2.4V 0.7 HIGH-TO-LOW THRESHOLD FREQUENCY (MHz) 0.50 FREQUENCY (MHz) 1.0 THRESHOLD VOL 0.6 0.25 0.9 0 0.8 0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 –50 –20 10 40 70 100 130 1.5 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) TEMPERATURE (oC) SUPPLY VOLTAGE (V) 3852 G29 3852 G30 3852 G31 3852f 7
TYPICAL PERFORMANCE CHARACTERISTICS Controller Oscillator Frequency Controller Undervoltage Lockout Shutdown Input DC Supply Current vs Temperature Threshold (INTVCC) vs Temperature vs Input Voltage Controller Only
900 5 40 800 R 35 FREQ = 36k 4 INTVCC RAMPING UP 30 700 3 25 INTV 600 CC RAMPING DOWN RFREQ = 60k 20 500 2 15 FREQUENCY (kHz) 400 10 VOLTAGE AT UVLO THRESHOLD (V) 1 300 R CC FREQ = 160k SHUTDOWN SUPPLY CURRENT (μA) 5 INTV 200 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 3852 G22 3852 G24 3852 G25
Shutdown Input DC Supply Current Input DC Supply Current Maximum Current Sense vs Temperature Controller Only vs Temperature Controller Only Threshold vs INTVCC Voltage
40 3.0 90 35 80 2.5 30 70 2.0 60 25 50 20 1.5 40 15 1.0 30 10 20 0.5 5 INPUT DC SUPPLY CURRENT (mA) CURRENT SENSE THRESHOLD (mV) 10 SHUTDOWN INPUT DC SUPPLY CURRENT (μA) 0 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 TEMPERATURE (°C) TEMPERATURE (°C) INTVCC VOLTAGE(V) 3852 G26 3852 G27 3852 G28
Charge Pump Oscillator Charge Pump Oscillator Charge Pump SHDN Threshold Frequency vs Supply Voltage Frequency vs Temperature Voltage vs Supply Voltage
1.50 1.4 0.9 V 1.25 1.3 IN = 4.5V LOW-TO-HIGH THRESHOLD 0.8 1.00 1.2 TAGE (V) 0.75 1.1 VIN = 2.4V 0.7 HIGH-TO-LOW THRESHOLD FREQUENCY (MHz) 0.50 FREQUENCY (MHz) 1.0 THRESHOLD VOL 0.6 0.25 0.9 0 0.8 0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 –50 –20 10 40 70 100 130 1.5 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) TEMPERATURE (oC) SUPPLY VOLTAGE (V) 3852 G29 3852 G30 3852 G31 3852f 7