Datasheet LTC3425 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter |
| Pages / Page | 24 / 6 — TYPICAL PERFOR A CE CHARACTERISTICS. Maximum Output Current. Maximum … |
| File Format / Size | PDF / 284 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Maximum Output Current. Maximum Start-Up Load vs VIN. Automatic Burst Mode Current
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LTC3425
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Output Current Maximum Start-Up Load vs VIN Automatic Burst Mode Current in Burst Mode Operation (Constant Current Load) Thresholds vs RBURST
350 0.7 100 TA = 25°C T T A = 25°C A = 25°C 300 0.6 LEAVE VOUT = 3.3V VOUT = 3.3V Burst Mode 250 0.5 OPERATION VOUT = 5V ENTER 200 0.4 Burst Mode V 10 OUT = 5V OPERATION 150 0.3 LOAD CURRENT (A) 100 0.2 OUTPUT CURRENT (mA) AVERAGE LOAD CURRENT (mA) 50 0.1 0 0 1 1 1.5 2 2.5 3 3.5 4 4.5 5 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 10 100 1000 V BURST RESISTOR (kΩ) IN (V) VIN (V) 3425 G22 3425 G20 3425 G21
Automatic Burst Mode Thresholds Soft-Start Charging Current vs V vs Temperature IN Shutdown Voltage vs Temperature
100 3.0 0.450 VOUT = 5V VIN > 2.3V 90 2.5 0.425 VOUT = 3.3V µA) 80 LEAVE Burst Mode OPERATION 2.0 0.400 VIN < 2.3V 70 1.5 (START-UP MODE) 0.375 ENTER Burst Mode OPERATION 60 1.0 0.350 LOAD CURRENT (mA) VOUT = 3.3V SS CHARGE CURRENT ( SHUTDOWN VOLTAGE (V) 50 0.5 0.325 V TA = 25°C OUT = 5V RBURST = 33k 40 0 0.300 1.5 2 2.5 3 3.5 4 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 V TEMPERATURE (°C) IN (V) TEMPERATURE (°C) 3425 G23 3425 G24 3425 G25
Minimum Start-Up Voltage PMOS Reverse Current in Forced vs Temperature PGOOD Threshold vs Temperature CCM vs Temperature
1.00 11.8 800 ) 11.7 750 FB 0.95 11.6 700 11.5 650 0.90 11.4 600 0.85 11.3 550 11.2 500 0.80 START VOLTAGE (V) 11.1 450 11.0 400 0.75 PMOS REVERSE CURRENT (mA) PGOOD THRESHOLD (1% BELOW V 10.9 350 0.70 10.8 300 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3425 G26 3425 G27 3425 G28 3425f 6
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Output Current Maximum Start-Up Load vs VIN Automatic Burst Mode Current in Burst Mode Operation (Constant Current Load) Thresholds vs RBURST
350 0.7 100 TA = 25°C T T A = 25°C A = 25°C 300 0.6 LEAVE VOUT = 3.3V VOUT = 3.3V Burst Mode 250 0.5 OPERATION VOUT = 5V ENTER 200 0.4 Burst Mode V 10 OUT = 5V OPERATION 150 0.3 LOAD CURRENT (A) 100 0.2 OUTPUT CURRENT (mA) AVERAGE LOAD CURRENT (mA) 50 0.1 0 0 1 1 1.5 2 2.5 3 3.5 4 4.5 5 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 10 100 1000 V BURST RESISTOR (kΩ) IN (V) VIN (V) 3425 G22 3425 G20 3425 G21
Automatic Burst Mode Thresholds Soft-Start Charging Current vs V vs Temperature IN Shutdown Voltage vs Temperature
100 3.0 0.450 VOUT = 5V VIN > 2.3V 90 2.5 0.425 VOUT = 3.3V µA) 80 LEAVE Burst Mode OPERATION 2.0 0.400 VIN < 2.3V 70 1.5 (START-UP MODE) 0.375 ENTER Burst Mode OPERATION 60 1.0 0.350 LOAD CURRENT (mA) VOUT = 3.3V SS CHARGE CURRENT ( SHUTDOWN VOLTAGE (V) 50 0.5 0.325 V TA = 25°C OUT = 5V RBURST = 33k 40 0 0.300 1.5 2 2.5 3 3.5 4 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 V TEMPERATURE (°C) IN (V) TEMPERATURE (°C) 3425 G23 3425 G24 3425 G25
Minimum Start-Up Voltage PMOS Reverse Current in Forced vs Temperature PGOOD Threshold vs Temperature CCM vs Temperature
1.00 11.8 800 ) 11.7 750 FB 0.95 11.6 700 11.5 650 0.90 11.4 600 0.85 11.3 550 11.2 500 0.80 START VOLTAGE (V) 11.1 450 11.0 400 0.75 PMOS REVERSE CURRENT (mA) PGOOD THRESHOLD (1% BELOW V 10.9 350 0.70 10.8 300 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 –45 –25 –5 15 35 55 75 95 115 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3425 G26 3425 G27 3425 G28 3425f 6
