Datasheet LTC1876 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator |
| Pages / Page | 36 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency vs Output Current and. … |
| File Format / Size | PDF / 372 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency vs Output Current and. Efficiency vs Output Current
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LTC1876
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Output Current and Efficiency vs Output Current Efficiency vs Input Voltage Mode (Figure 1) (Figure 1) (Figure 1)
100 100 100 Burst Mode VOUT = 5V V VOUT = 5V 90 IN = 7V OPERATION IOUT = 3A 80 90 90 70 VIN = 10V FORCED VIN = 15V 60 CONTINUOUS 80 80 MODE 50 VIN = 20V 40 CONSTANT 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 FREQUENCY (BURST DISABLE) 20 60 60 10 VIN = 15V VOUT = 5V 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) 1876 G01 1876 G02 1876 G03
VIN Supply Current vs Input INTVCC and EXTVCC Switch Voltage and Mode (Figure 1) EXTVCC Voltage Drop Voltage vs Temperature
1000 250 5.05 INTVCC VOLTAGE 5.00 800 200 µA) 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 STANDBY 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) 1876 G04 1876 G05 1876 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 INTV 4.6 25 20 4.5 10 4.4 0 0 5 10 15 20 25 30 35 0 0 25 50 75 100 INPUT VOLTAGE (V) 0 20 40 60 80 100 PERCENT ON NOMINAL OUTPUT VOLTAGE (%) DUTY FACTOR (%) 1876 G07 1876 G09 1876 G08 1876fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Output Current and Efficiency vs Output Current Efficiency vs Input Voltage Mode (Figure 1) (Figure 1) (Figure 1)
100 100 100 Burst Mode VOUT = 5V V VOUT = 5V 90 IN = 7V OPERATION IOUT = 3A 80 90 90 70 VIN = 10V FORCED VIN = 15V 60 CONTINUOUS 80 80 MODE 50 VIN = 20V 40 CONSTANT 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 FREQUENCY (BURST DISABLE) 20 60 60 10 VIN = 15V VOUT = 5V 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) 1876 G01 1876 G02 1876 G03
VIN Supply Current vs Input INTVCC and EXTVCC Switch Voltage and Mode (Figure 1) EXTVCC Voltage Drop Voltage vs Temperature
1000 250 5.05 INTVCC VOLTAGE 5.00 800 200 µA) 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 STANDBY 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) 1876 G04 1876 G05 1876 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 INTV 4.6 25 20 4.5 10 4.4 0 0 5 10 15 20 25 30 35 0 0 25 50 75 100 INPUT VOLTAGE (V) 0 20 40 60 80 100 PERCENT ON NOMINAL OUTPUT VOLTAGE (%) DUTY FACTOR (%) 1876 G07 1876 G09 1876 G08 1876fa 5
