Datasheet LTC3774 (Analog Devices) - 6

LTC3774
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency Power Loss Efficiency
100 5.0 100 VIN = 7V VIN = 7V VIN = 12V 90 VOUT = 1.5V 4.5 VOUT = 1.5V 90 VOUT = 1.5V 80 4.0 BURST MODE 80 70 PULSE-SKIPPING 3.5 CCM 70 60 3.0 60 50 2.5 50 40 2.0 40 EFFICIENCY (%) EFFICIENCY (%) 30 POWER LOSS (W) 1.5 30 20 BURST MODE 1.0 20 BURST MODE 10 PULSE-SKIPPING 0.5 10 PULSE-SKIPPING CCM CCM 0 0 0 0.01 0.1 1 10 100 0.01 0.1 1 10 100 0.01 0.1 1 10 100 ILOAD (A) ILOAD (A) ILOAD (A) 3774 G09 3774 G10 3774 G11
TK/SS Pull-Up Current Power Loss vs Temperature RUN Threshold vs Temperature
5.0 1.5 1.4 VIN = 12V 4.5 VOUT = 1.5V 4.0 BURST MODE 1.4 1.3 PULSE-SKIPPING 3.5 CCM ON 3.0 1.3 1.2 2.5 (µA) OFF 2.0 I TK/SS 1.2 1.1 POWER LOSS (W) 1.5 RUN THRESHOLD (V) 1.0 1.1 1.0 0.5 0 1 0.9 0.01 0.1 1 10 100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 ILOAD (A) TEMPERATURE (°C) TEMPERATURE (°C) 3774 G12 3774 G13 3774 G14
Regulated Feedback Voltage Oscillator Frequency Undervoltage Lockout Threshold vs Temperature vs Temperature (INTVCC) vs Temperature
604.5 700 5.0 675 4.8 603.0 4.6 650 601.5 4.4 RISE 625 4.2 600.0 600 4.0 FALL 575 3.8 598.5 FREQUENCY (kHz) 3.6 550 UVLO THRESHOLD (V) 597.0 3.4 REGULATED FEEDBACK VOLTAGE (mV) 525 3.2 595.5 500 3.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3774 G15 3774 G16 3774 G17 3774fc 6 For more information www.linear.com/LTC3774 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts