Datasheet LTC3543 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS. Note 3:. Note 5:. Note 4 |
| File Format / Size | PDF / 342 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. Note 3:. Note 5:. Note 4
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LTC3543
ELECTRICAL CHARACTERISTICS Note 3:
TJ is calculated from the ambient temperature TA and power
Note 5:
Dynamic supply current is higher due to the gate charge being dissipation PD according to the following formula: TJ = TA + (PD)(64°C/W) delivered at the switching frequency.
Note 4
: The LTC3543 is tested in a proprietary test mode that connects VFB to the output of the error amplifi er. This test mode is equivalent to continuous mode operation.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. (From Figure 1a) Effi ciency vs Input Voltage (VIN) Effi ciency vs Load Current Effi ciency vs Load Current
100 100 100 VIN = 2.7V Burst Mode OPERATION IOUT = 200mA 90 Burst Mode OPERATION 90 ENABLED 90 80 ENABLED 80 V I 70 V 70 IN = 4.2V 80 OUT = 600mA IN = 4.2V 60 60 V 70 50 50 IN = 3.6V V I IN = 3.6V OUT = 10mA 40 40 EFFICIENCY (%) 60 EFFICIENCY (%) EFFICIENCY (%) 30 30 20 20 VIN = 2.7V 50 10 10 VOUT = 1.8V VOUT = 1.2V VOUT = 1.5V 40 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.1 1 10 100 1000 0.1 1 10 100 1000 INPUT VOLTAGE (V) LOAD CURRENT (mA) LOAD CURRENT (mA) 3543 G01 3543 G02 3543 G03
Power Loss vs Load Current Effi ciency vs Load Current Effi ciency vs Load Current
500 100 100 V Burst Mode OPERATION OUT = 1.2V Burst Mode OPERATION V ENABLED OUT = 1.5V 90 ENABLED 90 V 400 OUT = 1.8V 80 V 80 OUT = 2.5V 70 70 VIN = 4.2V VIN = 4.2V 300 60 60 50 50 VIN = 3.6V VIN = 3.6V 200 40 40 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS (mW) 30 30 100 20 20 VIN = 2.7V VIN = 2.7V 10 10 V VOUT = 2.5V 0 OUT = 1.8V 0 0 0.1 1 10 100 1000 0.1 1 10 100 1000 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3543 G04 3543 G05 3543 G06 3543fa 3
ELECTRICAL CHARACTERISTICS Note 3:
TJ is calculated from the ambient temperature TA and power
Note 5:
Dynamic supply current is higher due to the gate charge being dissipation PD according to the following formula: TJ = TA + (PD)(64°C/W) delivered at the switching frequency.
Note 4
: The LTC3543 is tested in a proprietary test mode that connects VFB to the output of the error amplifi er. This test mode is equivalent to continuous mode operation.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. (From Figure 1a) Effi ciency vs Input Voltage (VIN) Effi ciency vs Load Current Effi ciency vs Load Current
100 100 100 VIN = 2.7V Burst Mode OPERATION IOUT = 200mA 90 Burst Mode OPERATION 90 ENABLED 90 80 ENABLED 80 V I 70 V 70 IN = 4.2V 80 OUT = 600mA IN = 4.2V 60 60 V 70 50 50 IN = 3.6V V I IN = 3.6V OUT = 10mA 40 40 EFFICIENCY (%) 60 EFFICIENCY (%) EFFICIENCY (%) 30 30 20 20 VIN = 2.7V 50 10 10 VOUT = 1.8V VOUT = 1.2V VOUT = 1.5V 40 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.1 1 10 100 1000 0.1 1 10 100 1000 INPUT VOLTAGE (V) LOAD CURRENT (mA) LOAD CURRENT (mA) 3543 G01 3543 G02 3543 G03
Power Loss vs Load Current Effi ciency vs Load Current Effi ciency vs Load Current
500 100 100 V Burst Mode OPERATION OUT = 1.2V Burst Mode OPERATION V ENABLED OUT = 1.5V 90 ENABLED 90 V 400 OUT = 1.8V 80 V 80 OUT = 2.5V 70 70 VIN = 4.2V VIN = 4.2V 300 60 60 50 50 VIN = 3.6V VIN = 3.6V 200 40 40 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS (mW) 30 30 100 20 20 VIN = 2.7V VIN = 2.7V 10 10 V VOUT = 2.5V 0 OUT = 1.8V 0 0 0.1 1 10 100 1000 0.1 1 10 100 1000 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3543 G04 3543 G05 3543 G06 3543fa 3
