Datasheet LTC3421 (Analog Devices) - 5

LTC3421
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Single Cell to 3.3V Efficiency 2-Cell to 3.3V Efficiency Li-Ion to 5V Efficiency
100 100 100 Burst Mode OPERATION VIN = 1.5V Burst Mode OPERATION 90 90 90 VIN = 3V V VIN = 4.2V 80 IN = 2.4V 80 80 Burst Mode V VIN = 3.6V IN = 1.2V VIN = 2V OPERATION V 70 IN = 2.7V V 70 70 IN = 1V 60 60 60 50 50 50 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 20 20 20 10 VOUT = 3.3V 10 VOUT = 3.3V 10 VOUT = 5V fOSC = 1MHz f f 0 OSC = 1MHz OSC = 1MHz 0 0 0.1 1 10 100 1000 0.1 1 10 100 1000 0.1 1 10 100 1000 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3421 G01 3421 G02 3421 G03
Burst Mode Operation Load Transient Response Inrush Current Control
VOUT VOUT 50mV/DIV 100mV/DIV VOUT AC COUPLED AC COUPLED 1V/DIV SW INDUCTOR 600mA INDUCTOR CURRENT IOUT CURRENT 0.5A/DIV 50mA 0.5A/DIV 2.5µs/DIV 3421 G04 VIN = 2.4V 2.5ms/DIV 3421 G05 VIN = 0V TO 2.4V 500µs/DIV 3421 G06 VOUT = 3.3V COUT = 44µF COUT = 44µF
Start-Up Voltage vs Output Efficiency vs Frequency Efficiency vs VIN Current
100 100 1.20 VOUT = 3.3V 90 f = 300kHz 90 IOUT = 200mA 1.15 80 80 1.10 70 70 f = 3MHz 60 60 1.05 f = 1MHz TAGE (V) 50 50 1.00 40 40 V T VOL IN > VOUT EFFICIENCY (%) EFFICIENCY (%) PMOS LDO MODE AR 0.95 30 30 ST 0.90 20 20 10 VIN = 2.4V 10 0.85 VOUT = 3.3V 0 0 0.80 1 10 100 1000 1 1.5 2 2.5 3 3.5 4 4.5 5 0 50 100 150 200 OUTPUT CURRENT (mA) INPUT VOLTAGE (V) OUTPUT CURRENT (mA) 3421 G07 3421 G08 3421 G09 Rev. A For more information www.analog.com 5 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Package/Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Low Voltage Start-Up Low Noise Fixed Frequency Operation Burst Mode Operation Output Disconnect and Inrush Limiting Applications Information Component Selection Typical Application Package Description Revision History Typical Application Related Parts