Datasheet LTC3547B (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual Monolithic 300mA Synchronous Step-Down Regulator |
| Pages / Page | 16 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Effi ciency vs Load Current. Load … |
| File Format / Size | PDF / 260 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Effi ciency vs Load Current. Load Regulation. Line Regulation. Start-Up From Shutdown
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LTC3547B
W U TYPICAL PERFOR A CE CHARACTERISTICS Effi ciency vs Load Current Load Regulation Line Regulation
100 1.2 0.6 V V OUT = 2.5V IN = 3.6V VOUT = 1.2V VOUT = 1.8V 90 VOUT = 1.8V I 1.O LOAD = 100mA VOUT = 2.5V 0.4 80 70 0.8 0.2 60 0.6 PULSE SKIP MODE 50 OPERATION 0 ERROR (%) 0.4 ERROR (%) 40 OUT OUT EFFICIENCY (%) V V –0.2 30 0.2 20 VIN = 2.7V 0 –0.4 10 VIN = 3.6V VIN = 4.2V 0 –0.2 –0.6 0.1 1 10 100 1000 0 50 100 150 200 250 300 350 2.5 3 3.5 4 4.5 5 5.5 OUTPUT CURRENT (mA) LOAD CURRENT (mA) V 3547b G12 IN (V) 3547b G13 3547b G14
Start-Up From Shutdown Start-Up From Shutdown Load Step
RUN RUN VOUT, 2V/DIV 2V/DIV AC-COUPLED 100mV/DIV VOUT VOUT 1V/DIV 1V/DIV IL 200mA/DIV I I L IL LOAD 100mA/DIV 200mA/DIV 200mA/DIV 3547b G15 3547b G16 3547b G17 200μs/DIV 250μs/DIV 10μs/DIV VIN = 3.6V VIN = 3.6V VIN = 3.6V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 0A ILOAD = 300mA ILOAD = 0mA TO 300mA
Load Step Load Step
V V OUT, OUT, AC-COUPLED AC-COUPLED 100mV/DIV 100mV/DIV IL IL 200mA/DIV 200mA/DIV I I LOAD LOAD 200mA/DIV 200mA/DIV 3547b G18 3547b G19 10μs/DIV 10μs/DIV V V IN = 3.6V IN = 3.6V V V OUT = 1.8V OUT = 1.8V I I LOAD = 20mA TO 300mA LOAD = 50mA TO 300mA 3547bfb 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Effi ciency vs Load Current Load Regulation Line Regulation
100 1.2 0.6 V V OUT = 2.5V IN = 3.6V VOUT = 1.2V VOUT = 1.8V 90 VOUT = 1.8V I 1.O LOAD = 100mA VOUT = 2.5V 0.4 80 70 0.8 0.2 60 0.6 PULSE SKIP MODE 50 OPERATION 0 ERROR (%) 0.4 ERROR (%) 40 OUT OUT EFFICIENCY (%) V V –0.2 30 0.2 20 VIN = 2.7V 0 –0.4 10 VIN = 3.6V VIN = 4.2V 0 –0.2 –0.6 0.1 1 10 100 1000 0 50 100 150 200 250 300 350 2.5 3 3.5 4 4.5 5 5.5 OUTPUT CURRENT (mA) LOAD CURRENT (mA) V 3547b G12 IN (V) 3547b G13 3547b G14
Start-Up From Shutdown Start-Up From Shutdown Load Step
RUN RUN VOUT, 2V/DIV 2V/DIV AC-COUPLED 100mV/DIV VOUT VOUT 1V/DIV 1V/DIV IL 200mA/DIV I I L IL LOAD 100mA/DIV 200mA/DIV 200mA/DIV 3547b G15 3547b G16 3547b G17 200μs/DIV 250μs/DIV 10μs/DIV VIN = 3.6V VIN = 3.6V VIN = 3.6V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 0A ILOAD = 300mA ILOAD = 0mA TO 300mA
Load Step Load Step
V V OUT, OUT, AC-COUPLED AC-COUPLED 100mV/DIV 100mV/DIV IL IL 200mA/DIV 200mA/DIV I I LOAD LOAD 200mA/DIV 200mA/DIV 3547b G18 3547b G19 10μs/DIV 10μs/DIV V V IN = 3.6V IN = 3.6V V V OUT = 1.8V OUT = 1.8V I I LOAD = 20mA TO 300mA LOAD = 50mA TO 300mA 3547bfb 5
