Datasheet LTC3728 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator |
| Pages / Page | 36 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Up (Figure 13). Load Step … |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Up (Figure 13). Load Step (Figure 13). Input Source/Capacitor
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Text Version of Document
LTC3728
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Up (Figure 13) Load Step (Figure 13) Load Step (Figure 13)
VOUT VOUT VOUT 5V/DIV 200mV/DIV 200mV/DIV VRUN/SS 5V/DIV IL IL 2A/DIV I 2A/DIV L 2A/DIV VIN = 15V 5ms/DIV 3728 G19 VIN = 15V 20μs/DIV 3728 G20 VIN = 15V 20μs/DIV 3728 G21 VOUT = 5V VOUT = 5V VOUT = 5V VPLLFLTR = 0V VPLLFLTR = 0V LOAD STEP = 0A to 3A LOAD STEP = 0A to 3A Burst Mode OPERATION CONTINUOUS OPERATION
Input Source/Capacitor Constant-Frequency (Burst Instantaneous Current (Figure 13) Burst Mode Operation (Figure 13) Inhibit) Operation (Figure 13)
IIN 2A/DIV VOUT VOUT V 20mV/DIV IN 20mV/DIV 200mV/DIV VSW1 10V/DIV VSW2 10V/DIV IL IL 0.5A/DIV 0.5A/DIV VIN = 15V 1μs/DIV 3728 G22 VIN = 15V 10μs/DIV 3728 G23 VIN = 15V 2μs/DIV 3728 G24 VOUT = 5V VOUT = 5V VOUT = 5V VPLLFLTR = 0V VPLLFLTR = 0V VPLLFLTR = 0V IOUT = IOUT3.3A = 2A VFCB = OPEN VFCB = 5V IOUT = 20mA IOUT = 20mA
Current Sense Pin Input Current EXTVCC Switch Resistance Oscillator Frequency vs Temperature vs Temperature vs Temperature
35 10 700 VOUT = 5V A) μ ) 600 V 33 Ω 8 PLLFLTR = 5V 500 31 6 VPLLFLTR = 1.2V 400 300 29 4 VPLLFLTR = 0V SWITCH RESISTANCE ( FREQUENCY (kHz) 200 CC 27 2 EXTV 100 CURRENT SENSE INPUT CURRENT ( 25 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3728 G26 3728 G27 3728 G28 3728fg 7
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Up (Figure 13) Load Step (Figure 13) Load Step (Figure 13)
VOUT VOUT VOUT 5V/DIV 200mV/DIV 200mV/DIV VRUN/SS 5V/DIV IL IL 2A/DIV I 2A/DIV L 2A/DIV VIN = 15V 5ms/DIV 3728 G19 VIN = 15V 20μs/DIV 3728 G20 VIN = 15V 20μs/DIV 3728 G21 VOUT = 5V VOUT = 5V VOUT = 5V VPLLFLTR = 0V VPLLFLTR = 0V LOAD STEP = 0A to 3A LOAD STEP = 0A to 3A Burst Mode OPERATION CONTINUOUS OPERATION
Input Source/Capacitor Constant-Frequency (Burst Instantaneous Current (Figure 13) Burst Mode Operation (Figure 13) Inhibit) Operation (Figure 13)
IIN 2A/DIV VOUT VOUT V 20mV/DIV IN 20mV/DIV 200mV/DIV VSW1 10V/DIV VSW2 10V/DIV IL IL 0.5A/DIV 0.5A/DIV VIN = 15V 1μs/DIV 3728 G22 VIN = 15V 10μs/DIV 3728 G23 VIN = 15V 2μs/DIV 3728 G24 VOUT = 5V VOUT = 5V VOUT = 5V VPLLFLTR = 0V VPLLFLTR = 0V VPLLFLTR = 0V IOUT = IOUT3.3A = 2A VFCB = OPEN VFCB = 5V IOUT = 20mA IOUT = 20mA
Current Sense Pin Input Current EXTVCC Switch Resistance Oscillator Frequency vs Temperature vs Temperature vs Temperature
35 10 700 VOUT = 5V A) μ ) 600 V 33 Ω 8 PLLFLTR = 5V 500 31 6 VPLLFLTR = 1.2V 400 300 29 4 VPLLFLTR = 0V SWITCH RESISTANCE ( FREQUENCY (kHz) 200 CC 27 2 EXTV 100 CURRENT SENSE INPUT CURRENT ( 25 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3728 G26 3728 G27 3728 G28 3728fg 7
