Datasheet LT3506, LT3506A (Analog Devices) - 4

LT3506/LT3506A
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency, VOUT = 1.8V (LT3506A) Effi ciency, VOUT = 3.3V (LT3506) Effi ciency, VOUT = 5V (LT3506)
90 100 100 VOUT = 1.8V VOUT = 3.3V VOUT = 5V L = 2.2μH (COILCRAFT LPS4012-222) 95 L = 6.4μH (SUMIDA CR54-6R4) 95 L = 10μH (COOPER UP1B-100) 85 TA = 25°C TA = 25°C TA = 25°C 90 VIN = 5V 90 VIN = 8V 80 85 85 VIN = 4.5V 75 80 80 70 75 V V 75 IN = 15V IN = 12V VIN = 10V 70 70 EFFICIENCY (%) 65 EFFICIENCY (%) EFFICIENCY (%) VIN = 25V V 65 IN = 7V 65 60 VIN = 25V 60 60 55 55 55 50 50 50 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0.4 0.8 1.2 1.6 0 0.4 0.8 1.2 1.6 IOUT (A) IOUT (A) IOUT (A) 3506 G01 3506 G02 3506 G03
Maximum Load Current, Maximum Load Current, VOUT = 1.8V (LT3506A) VOUT = 3.3V (LT3506A) Switch VCESAT
1.8 1.8 400 TA = 25°C SLOPE COMPENSATION REQUIRES TA = 25°C L > 2.2μH FOR VIN < 7 WITH VOUT = 3.3V T L = 2.2μH A = 25°C 1.6 1.6 L = 4.7μH 300 L = 1.5μH L = 3.3μH TAGE (mV) 1.4 1.4 200 L = 1μH LOAD CURRENT (A) LOAD CURRENT (A) L = 2.2μH 1.2 1.2 SWITCH VOL 100 1.0 1.0 0 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 0 0.5 1.0 1.5 2.0 INPUT VOLTAGE (V)* INPUT VOLTAGE (V)* SW CURRENT (A) 3506 G04 3506 G05 3506 G06
Boost Pin Current Current Limit vs Duty Cycle
40 3.0 TA = 25°C TA = 25°C TYPICAL 2.5 30 2.0 MINIMUM 20 1.5 1.0 BOOST CURRENT (mA) CURRENT LIMIT (A) 10 0.5 0 0 0 0.5 1.0 1.5 2.0 0 20 40 60 80 100 SWITCH CURRENT (A) DUTY CYCLE (%) 3506 G07 3506 G08 3506afc 4