Datasheet LTC3773 (Analog Devices) - 5

LTC3773
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current, Effi ciency vs Load Current, Shutdown CH2 and CH3 Power-Up CH2 and CH3
100 10000 100 10000 90 90 80 1000 80 1000 POWER LOSS (mW) POWER LOSS (mW) 70 70 60 100 60 CONTINUOUS 100 CONTINUOUS MODE 50 MODE 50 40 DISCONTINUOUS DISCONTINUOUS 10 40 10 MODE MODE 30 30 Burst Mode Burst Mode CHANNEL 1 EFFICIENCY (%) 20 1 CHANNEL 1 EFFICIENCY (%) OPERATION 20 1 OPERATION 10 EFFICIENCY 10 EFFICIENCY POWER LOSS POWER LOSS 0 0.1 0 0.1 0.001 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 CHANNEL 1 LOAD CURRENT (A) CHANNEL 1 LOAD CURRENT (A) VIN = 12V, VCC = 5V, VOUT1 = 2.5V VIN = 12V, VCC = 5V, VOUT1 = 2.5V fSW = 220kHz 3773 G01 VOUT2 = 1.8V (NO LOAD), VOUT3 = 1.2V (NO LOAD) fSW = 220kHz 3773 G02
Effi ciency vs VIN Shutdown CH2 and CH3 Load Regulation
100 4.0 5 0.2 VCC = 5V, VOUT1 = 2.5V, IOUT1 = 5A VIN = 12V, VCC = 5V, VOUT = 2.5V SHUTDOWN CH2 AND CH3 0 0.0 95 3.2 NORMALIZED POWER LOSS (W) –5 –0.2 90 PLLFLTR = 5V 2.4 fSW = 560kHz (mV) PLLFLTR FLOATS –10 –0.4 Δ f V 85 SW = 400kHz 1.6 ΔV OUT OUT PLLFLTR = 0V –15 –0.6 f (%) SW = 220kHz CHANNEL 1 EFFICIENCY (%) 80 0.8 CONTINUOUS MODE –20 –0.8 DISCONTINUOUS MODE EFFICIENCY Burst Mode OPERATION POWER LOSS 75 0.0 –25 –1.0 0 5 10 15 20 25 0 5 10 15 20 VIN (V) LOAD CURRENT (A) 3773 G03 3773 G04
Line Regulation Current Limit vs VIN
2.5 1.0 25 VCC = 5V, VOUT = 2.5V, IOUT = 5A 2.0 0.8 RSENSE = 3mΩ 1.5 0.6 NOMALIZED 20 1.0 0.4 0.5 0.2 15 (mV) Δ 0 0 V RSENSE = 5mΩ OUT ΔV OUT –0.5 –0.2 10 (mV/V) –1.0 –0.4 –1.5 –0.6 MAXIMUM LOAD CURRENT (A) 5 –2.0 –0.8 VCC = 5V, VOUT = 2.5V, fSW = 220kHz –2.5 –1.0 0 0 5 10 15 20 25 0 5 10 15 20 25 VIN (V) VIN (V) 3773 G05 3773 G06 3773fb 5