Datasheet LTC3522 (Analog Devices) - 4

LTC3522
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Buck-Boost Effi ciency, Li-Ion to 3.3V Buck Effi ciency, Li-Ion to 2.5V
100 160 100 160 Burst Mode 90 Burst Mode 140 90 OPERATION 140 OPERATION 80 80 120 POWER LOSS (mW) 120 POWER LOSS (mW) 70 70 100 PWM Mode 100 60 60 PWM Mode 50 80 50 80 40 Burst Mode 60 40 60 EFFICIENCY (%) POWER LOSS Burst Mode EFFICIENCY (%) 30 30 VIN = 3.7V POWER LOSS V 40 IN = 4.2V V 40 IN = 4.2V 20 VIN = 2.7V 20 L: COILCRAFT 20 20 10 L: COILCRAFT 10 MSS6132-8.2μH MSS6132-4.7μH 0 0 0 0 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) 3522 G01 3522 G02
Buck Effi ciency, Li-Ion to 1.8V Buck Burst Mode Threshold Buck-Boost Switch RDS(0N)
100 160 50 400 Burst Mode L = 4.7μH 90 OPERATION 45 140 PMOS 350 (SWITCHES A AND D) 80 40 120 V POWER LOSS (mW) OUT = 1.2V 300 70 35 PWM Mode ) 60 100 30 V Ω 250 OUT = 1.8V (m 50 80 25 200 NMOS Burst Mode (SWITCHES B AND C) 40 20 DS(ON) POWER LOSS 60 R 150 EFFICIENCY (%) V 30 VIN = 4.2V LOAD CURRENT (mA) 15 OUT = 2.5V V 40 IN = 2.7V 100 20 10 L: COILCRAFT 20 50 10 MSS6132-8.2μH 5 0 0 0 0 1 10 100 1000 2.4 2.9 3.4 3.9 4.4 4.9 5.4 –40 –20 0 20 40 60 80 100 120 LOAD CURRENT (mA) VIN (V) TEMPERATURE (°C) 3522 G03 3522 G04 3522 G05
Switching Frequency vs Buck Switch RDS(0N) Temperature Switching Frequency vs VIN
600 10 10 8 8 500 6 6 PMOS 4 4 ) 400 Ω °C (%) 2 = 3.6V (%) 2 (m NMOS IN 300 0 0 DS(ON) –2 R –2 200 –4 –4 CHANGE FROM 25 –6 CHANGE FROM V –6 100 –8 –8 0 –10 –10 –40 –20 0 20 40 60 80 100 120 –50 –30 –10 10 30 50 70 90 110 2.5 2.9 3.4 3.9 4.4 4.9 5.4 TEMPERATURE (°C) TEMPERATURE (°C) VIN (V) 3522 G06 3522 G07 3522 G08 3522fa 4