Datasheet LTC3609 (Analog Devices) - 7

LTC3609 Typical perForMance characTerisTics
EXTVCC Switch Resistance INTVCC Load Regulation vs Temperature IEXTVCC vs Frequency
0.30 10 25 VIN = 24V 0.20 8 20 0.10 6 15 (%) 0 CC (mA) –0.10 4 ∆INTV I EXTVCC 10 SWITCH RESISTANCE (Ω) –0.20 CC 2 5 EXTV –0.30 –0.40 0 0 0 10 20 30 40 50 –50 –25 0 25 50 75 100 125 400 500 600 700 800 900 1000 INTV TEMPERATURE (°C) CC LOAD CURRENT (mA) FREQUENCY (kHz) 3609 G22 3609 G28 3609 G23
RUN/SS Pin Current RUN/SS Pin Current FCB Pin Current vs Temperature vs Temperature vs Temperature
0 3 5.0 –0.25 2 4.5 –0.50 PULL-DOWN CURRENT LATCHOFF ENABLE 1 –0.75 4.0 0 –1.00 FCB PIN CURRENT (µA) LATCHOFF THRESHOLD RUN/SS PIN CURRENT (µA) RUN/SS PIN CURRENT (µA) 3.5 –1.25 –1 PULL-UP CURRENT –1.50 –2 3.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3609 G25 3609 G26 3609 G24
Undervoltage Lockout Threshold vs Temperature Load Step Efficiency vs Load Current
4.0 100 f = 500kHz 95 IL 90 3.5 5A/DIV 85 DCM 80 3.0 75 VOUT 200mV/DIV 70 EFFICIENCY (%) CCM 65 2.5 60 3609 G29 40µs/DIV 55 VIN = 24V UNDERVOLTAGE LOCKOUT THRESHOLD (V) LOAD STEP 1A TO 4A FREQUENCY = 500kHz 2.0 VIN = 24V 50 –50 –25 0 25 50 75 100 125 VOUT = 12V 0.01 0.1 1 10 TEMPERATURE (°C) FCB = 0V LOAD CURRENT (A) 3609 G27 FIGURE 8 CIRCUIT 3609 G30 FIGURE 8 CIRCUIT 3609fb Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts