Datasheet LTC3728 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator |
| Pages / Page | 36 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Output Current and. … |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Output Current and. Effi ciency vs Output Current
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LTC3728
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current and Effi ciency vs Output Current Effi ciency vs Input Voltage Mode (Figure 13) (Figure 13) (Figure 13)
100 100 100 Burst Mode V 90 IN = 7V OPERATION 80 90 90 70 VIN = 10V FORCED VIN = 15V 60 CONTINUOUS 80 80 MODE (PWM) 50 VIN = 20V 40 CONSTANT 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 FREQUENCY (BURST DISABLE) 20 60 60 VIN = 15V VOUT = 5V 10 V VOUT = 5V OUT = 5V IOUT = 3A f = 250kHz f = 250kHz f = 250kHz 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 35 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3728 G01 3728 G02 3728 G03
Supply Current vs Input Voltage INTVCC and EXTVCC Switch and Mode (Figure 13) EXTVCC Voltage Drop Voltage vs Temperature
1000 250 5.05 INTVCC VOLTAGE 5.00 800 200 A) μ 4.95 600 150 4.90 BOTH SWITCH VOLTAGE (V) CONTROLLERS ON CC 4.85 400 100 VOLTAGE DROP (mV) CC SUPPLY CURRENT ( 4.80 200 EXTV 50 AND EXTV EXTVCC SWITCHOVER THRESHOLD CC 4.75 SHUTDOWN INTV 0 0 4.70 0 5 10 15 20 25 30 35 0 10 20 30 40 50 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) CURRENT (mA) TEMPERATURE (°C) 3728 G04 3728 G05 3728 G06
Maximum Current Sense Maximum Current Sense Threshold vs Percent of Nominal Internal 5V LDO Line Regulation Threshold vs Duty Factor Output Voltage (Foldback)
5.1 75 80 ILOAD = 1mA 5.0 70 60 4.9 50 50 4.8 (mV) (mV) 40 VOLTAGE (V) 4.7 CC SENSE SENSE V V 30 25 INTV 4.6 20 4.5 10 4.4 0 0 0 5 10 15 20 25 30 35 0 20 40 60 80 100 0 25 50 75 100 INPUT VOLTAGE (V) DUTY FACTOR (%) PERCENT ON NOMINAL OUTPUT VOLTAGE (%) 3728 G07 3728 G08 3728 G09 3728fg 5
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current and Effi ciency vs Output Current Effi ciency vs Input Voltage Mode (Figure 13) (Figure 13) (Figure 13)
100 100 100 Burst Mode V 90 IN = 7V OPERATION 80 90 90 70 VIN = 10V FORCED VIN = 15V 60 CONTINUOUS 80 80 MODE (PWM) 50 VIN = 20V 40 CONSTANT 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 FREQUENCY (BURST DISABLE) 20 60 60 VIN = 15V VOUT = 5V 10 V VOUT = 5V OUT = 5V IOUT = 3A f = 250kHz f = 250kHz f = 250kHz 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 35 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3728 G01 3728 G02 3728 G03
Supply Current vs Input Voltage INTVCC and EXTVCC Switch and Mode (Figure 13) EXTVCC Voltage Drop Voltage vs Temperature
1000 250 5.05 INTVCC VOLTAGE 5.00 800 200 A) μ 4.95 600 150 4.90 BOTH SWITCH VOLTAGE (V) CONTROLLERS ON CC 4.85 400 100 VOLTAGE DROP (mV) CC SUPPLY CURRENT ( 4.80 200 EXTV 50 AND EXTV EXTVCC SWITCHOVER THRESHOLD CC 4.75 SHUTDOWN INTV 0 0 4.70 0 5 10 15 20 25 30 35 0 10 20 30 40 50 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) CURRENT (mA) TEMPERATURE (°C) 3728 G04 3728 G05 3728 G06
Maximum Current Sense Maximum Current Sense Threshold vs Percent of Nominal Internal 5V LDO Line Regulation Threshold vs Duty Factor Output Voltage (Foldback)
5.1 75 80 ILOAD = 1mA 5.0 70 60 4.9 50 50 4.8 (mV) (mV) 40 VOLTAGE (V) 4.7 CC SENSE SENSE V V 30 25 INTV 4.6 20 4.5 10 4.4 0 0 0 5 10 15 20 25 30 35 0 20 40 60 80 100 0 25 50 75 100 INPUT VOLTAGE (V) DUTY FACTOR (%) PERCENT ON NOMINAL OUTPUT VOLTAGE (%) 3728 G07 3728 G08 3728 G09 3728fg 5
