Datasheet LTC3522 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Synchronous 400mA Buck-Boost and 200mA Buck Converters |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 284 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
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LTC3522
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. PVIN1 = PVIN2 = 3.6V, VOUT1 = 3.3V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle VFB2 = 0.54V ● 100 % Minimum Duty Cycle VFB2 = 0.66V ● 0 % PGOOD Threshold VFB2 Falling –11.3 –7.7 –4.1 % Power Good Hysteresis 2.5 %
Buck-Boost Converter
Output Voltage ● 2.2 5.25 V PMOS Switch Resistance 0.29 Ω NMOS Switch Resistance 0.22 Ω NMOS Switch Leakage VSW1A = VSW1B = 5V, PVIN1 = PVIN2 = 5V 0.1 5 μA PMOS Switch Leakage VSW1A = VSW1B = 0V, PVIN1 = PVIN2 = 5V 0.1 10 μA Feedback Voltage (Note 4) ● 0.97 1 1.03 V Feedback Input Current 1 50 nA Average Current Limit (Note 3) 0.65 0.85 A Burst Mode Current Limit 230 340 mA Reverse Current Limit (Note 3) 250 mA Maximum Duty Cycle VFB1 = 0.9V ● 70 80 % Minimum Duty Cycle VFB1 = 1.1V ● 0 % PGOOD Threshold VFB1 Falling –12 –10 –8 % Power Good Hysteresis 2.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3522 is tested in a proprietary non-switching test mode may cause permanent damage to the device. Exposure to any Absolute that connects each FB pin to the output of the respective error amplifi er. Maximum Rating condition for extended periods may affect device
Note 5:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
The LTC3522 is guaranteed to meet performance specifi cations temperature will exceed 125°C when overtemperature protection is active. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Continuous operation above the specifi ed maximum operating junction temperature range are assured by design, characterization and correlation temperature may impair device reliability. with statistical process controls.
Note 3:
Current measurements are performed when the LTC3522 is not switching. The current limit values in operation will be somewhat higher due to the propagation delay of the comparators. 3522fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. PVIN1 = PVIN2 = 3.6V, VOUT1 = 3.3V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle VFB2 = 0.54V ● 100 % Minimum Duty Cycle VFB2 = 0.66V ● 0 % PGOOD Threshold VFB2 Falling –11.3 –7.7 –4.1 % Power Good Hysteresis 2.5 %
Buck-Boost Converter
Output Voltage ● 2.2 5.25 V PMOS Switch Resistance 0.29 Ω NMOS Switch Resistance 0.22 Ω NMOS Switch Leakage VSW1A = VSW1B = 5V, PVIN1 = PVIN2 = 5V 0.1 5 μA PMOS Switch Leakage VSW1A = VSW1B = 0V, PVIN1 = PVIN2 = 5V 0.1 10 μA Feedback Voltage (Note 4) ● 0.97 1 1.03 V Feedback Input Current 1 50 nA Average Current Limit (Note 3) 0.65 0.85 A Burst Mode Current Limit 230 340 mA Reverse Current Limit (Note 3) 250 mA Maximum Duty Cycle VFB1 = 0.9V ● 70 80 % Minimum Duty Cycle VFB1 = 1.1V ● 0 % PGOOD Threshold VFB1 Falling –12 –10 –8 % Power Good Hysteresis 2.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3522 is tested in a proprietary non-switching test mode may cause permanent damage to the device. Exposure to any Absolute that connects each FB pin to the output of the respective error amplifi er. Maximum Rating condition for extended periods may affect device
Note 5:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
The LTC3522 is guaranteed to meet performance specifi cations temperature will exceed 125°C when overtemperature protection is active. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Continuous operation above the specifi ed maximum operating junction temperature range are assured by design, characterization and correlation temperature may impair device reliability. with statistical process controls.
Note 3:
Current measurements are performed when the LTC3522 is not switching. The current limit values in operation will be somewhat higher due to the propagation delay of the comparators. 3522fa 3
