Datasheet LTC3547B (Analog Devices) - 4

LTC3547B
W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency vs Temperature Switch Leakage vs Temperature Switch Leakage vs Input Voltage
2.6 50 500 2.5 VIN = 4.2V 40 400 2.4 2.3 VIN = 3.6V 30 300 SYNCHRONOUS 2.2 V SWITCH IN = 2.7V 20 SYNCHRONOUS 200 2.1 SWITCH FREQUENCY (MHz) 2.0 LEAKAGE CURRENT (nA) LEAKAGE CURRENT (pA) 10 100 MAIN SWITCH 1.9 MAIN SWITCH 1.8 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 2.5 3 3.5 4 4.5 5 5.5 6 TEMPERATURE (°C) TEMPERATURE (°C) VIN (V) 3547b G04 3547b G05 3547b G06
Reference Voltage vs Temperature RDS(ON) vs Input Voltage RDS(ON) vs Temperature
1.5 1.0 1.3 VIN = 2.7V MAIN SWITCH 1.2 1.0 0.9 1.1 0.5 0.8 1.0 VIN = 3.6V (Ω) (Ω) 0.9 0 0.7 SYNCHRONOUS SWITCH 0.8 (% ERROR) DS(ON) DS(ON) FB R R V –0.5 0.6 0.7 0.6 –1.0 0.5 MAIN SWITCH 0.5 SYNCHRONOUS VIN = 4.2V SWITCH –1.5 0.4 0.4 –50 –25 0 25 50 75 100 2.5 3 3.5 4 4.5 5 5.5 6 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 3547b G07 3547b G08 3547b G09
Effi ciency vs Load Current Effi ciency vs Load Current
100 100 VOUT = 1.2V VOUT = 1.8V 90 90 80 80 70 70 60 60 50 50 40 40 EFFICIENCY (%) EFFICIENCY (%) 30 30 20 20 VIN = 2.7V VIN = 2.7V 10 VIN = 3.6V 10 VIN = 3.6V VIN = 4.2V VIN = 4.2V 0 0 0.1 1 10 100 1000 0.1 1 10 100 1000 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3547b G10 3547b G11 3547bfb 4