Datasheet LTC3835 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Low IQ Synchronous Step-Down Controller |
| Pages / Page | 30 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25ºC, unless otherwise noted. … |
| Revision | F |
| File Format / Size | PDF / 818 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss. vs Output Current
Model Line for this Datasheet
Text Version of Document
LTC3835
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10000 Burst Mode OPERATION 100 98 VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V PULSE SKIPPING MODE 96 90 V 80 1000 OUT = 3.3V POWER LOSS (mW) 94 70 80 60 100 92 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 VIN = 12V VOUT = 3.3V 86 20 1 50 10 84 VOUT = 3.3V 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3835 G01 3835 G02 3835 G03 FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
VOUT VOUT V 100mV/ 100mV/DIV OUT 100mV/DIV DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 3835 G04 3835 G05 3835 G06 20µs/DIV 20µs/DIV 20µs/DIV FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
V FORCED OUT2 CONTIN- V 2V/DIV (MASTER) OUT UOUS 1V/DIV MODE VOUT1 2V/DIV 2A/DIV (SLAVE) BURST MODE PULSE- SKIPPING MODE 3835 G07 3835 G08 4µs/DIV 3835 G09 20ms/DIV 20ms/DIV FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT VOUT = 3.3V ILOAD = 300µA Rev. F For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10000 Burst Mode OPERATION 100 98 VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V PULSE SKIPPING MODE 96 90 V 80 1000 OUT = 3.3V POWER LOSS (mW) 94 70 80 60 100 92 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 VIN = 12V VOUT = 3.3V 86 20 1 50 10 84 VOUT = 3.3V 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3835 G01 3835 G02 3835 G03 FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
VOUT VOUT V 100mV/ 100mV/DIV OUT 100mV/DIV DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 3835 G04 3835 G05 3835 G06 20µs/DIV 20µs/DIV 20µs/DIV FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
V FORCED OUT2 CONTIN- V 2V/DIV (MASTER) OUT UOUS 1V/DIV MODE VOUT1 2V/DIV 2A/DIV (SLAVE) BURST MODE PULSE- SKIPPING MODE 3835 G07 3835 G08 4µs/DIV 3835 G09 20ms/DIV 20ms/DIV FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT VOUT = 3.3V ILOAD = 300µA Rev. F For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
