Datasheet LT3380 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Multioutput Power Management Solution with 4 Buck Switching and 3 LDO Linear Regulators with I2C |
| Pages / Page | 28 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Step-Down Switching Regulators 1. … |
| File Format / Size | PDF / 1.6 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Step-Down Switching Regulators 1. and 2 Efficiency vs IOUT. Buck RDS(ON) vs Temperature
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LT3380
TYPICAL PERFORMANCE CHARACTERISTICS Step-Down Switching Regulators 1 and 2 Efficiency vs IOUT Buck RDS(ON) vs Temperature Buck RDS(ON) vs VIN
100 250 200 VIN = 3.3V 90 PULSE-SKIPPING MODE 180 BUCK 3, 4 PMOS 80 200 160 VOUT = 2.5V BUCK 3, 4 PMOS 70 140 V 60 OUT = 1.2V 150 120 BUCK 1, 2 PMOS (mΩ) BUCK 1, 2 PMOS (mΩ) 50 100 BUCK 3, 4 NMOS BUCK 3, 4 NMOS 40 100 80 EFFICIENCY (%) R DS(ON) R DS(ON) 30 60 BUCK 1, 2 NMOS BUCK 1, 2 NMOS 20 50 40 10 20 0 0 0 1 10 100 1000 –50 0 50 100 150 2.5 3.5 4.5 5.5 IOUT (mA) TEMPERATURE (°C) VIN (V) 3380 G10 3380 G11 3380 G12
Step-Down Switching Regulator Step-Down Switching Regulator Buck Minimum Duty Cycle vs Current Limit vs Temperature Load Step Temperature
4.5 20 19 4.0 BUCK 1, 2 V = 3.8V 18 IN V = 5.0V V IN OUT = 1.2V 100mV/DIV 17 3.5 I 16 LOAD = 0.5A TO 1.5A 3.0 BUCK 3, 4 15 500mA/DIV Y CYCLE (%) 14 CURRENT (A) 2.5 DUT 13 12 2.0 COUT = 47µF 10µs/DIV 3380 G14 11 1.5 10 –50 0 50 100 150 –50 0 50 100 150 TEMPERATURE (°C) TEMPERATURE (°C) 3380 G15 3380 G13
LDO1 to LDO3 Dropout Voltage Buck Minimum Duty Cycle vs VIN vs Temperature
25 450 ILDO = 200mA 24 400 VLDO = 1.2V 23 350 22 300 21 250 VLDO = 1.8V 20 Y CYCLE (%) 200 19 VLDO = 3.3V DUT 18 150 DROPOUT VOLTAGE (mV) 17 100 16 50 15 0 2.5 3 3.5 4 4.5 5 5.5 –50 0 50 100 150 VIN (V) TEMPERATURE (°C) 3380 G16 3380 G17 Rev. 0 For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Step-Down Switching Regulators 1 and 2 Efficiency vs IOUT Buck RDS(ON) vs Temperature Buck RDS(ON) vs VIN
100 250 200 VIN = 3.3V 90 PULSE-SKIPPING MODE 180 BUCK 3, 4 PMOS 80 200 160 VOUT = 2.5V BUCK 3, 4 PMOS 70 140 V 60 OUT = 1.2V 150 120 BUCK 1, 2 PMOS (mΩ) BUCK 1, 2 PMOS (mΩ) 50 100 BUCK 3, 4 NMOS BUCK 3, 4 NMOS 40 100 80 EFFICIENCY (%) R DS(ON) R DS(ON) 30 60 BUCK 1, 2 NMOS BUCK 1, 2 NMOS 20 50 40 10 20 0 0 0 1 10 100 1000 –50 0 50 100 150 2.5 3.5 4.5 5.5 IOUT (mA) TEMPERATURE (°C) VIN (V) 3380 G10 3380 G11 3380 G12
Step-Down Switching Regulator Step-Down Switching Regulator Buck Minimum Duty Cycle vs Current Limit vs Temperature Load Step Temperature
4.5 20 19 4.0 BUCK 1, 2 V = 3.8V 18 IN V = 5.0V V IN OUT = 1.2V 100mV/DIV 17 3.5 I 16 LOAD = 0.5A TO 1.5A 3.0 BUCK 3, 4 15 500mA/DIV Y CYCLE (%) 14 CURRENT (A) 2.5 DUT 13 12 2.0 COUT = 47µF 10µs/DIV 3380 G14 11 1.5 10 –50 0 50 100 150 –50 0 50 100 150 TEMPERATURE (°C) TEMPERATURE (°C) 3380 G15 3380 G13
LDO1 to LDO3 Dropout Voltage Buck Minimum Duty Cycle vs VIN vs Temperature
25 450 ILDO = 200mA 24 400 VLDO = 1.2V 23 350 22 300 21 250 VLDO = 1.8V 20 Y CYCLE (%) 200 19 VLDO = 3.3V DUT 18 150 DROPOUT VOLTAGE (mV) 17 100 16 50 15 0 2.5 3 3.5 4 4.5 5 5.5 –50 0 50 100 150 VIN (V) TEMPERATURE (°C) 3380 G16 3380 G17 Rev. 0 For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts
