Datasheet LTC3649 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output |
| Pages / Page | 26 / 4 — ELECTRICAL CHARACTERISTICS Note 1:. Note 2:. Note 3:. Note 4:. Note 6:. … |
| File Format / Size | PDF / 507 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS Note 1:. Note 2:. Note 3:. Note 4:. Note 6:. Note 7:. Note 5:
Text Version of Document
LTC3649
ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings 0°C to 85°C junction temperature. Specifications over the –40°C to may cause permanent damage to the device. Exposure to any Absolute 125°C operating junction temperature range are assured by design, Maximum Rating condition for extended periods may affect device characterization and correlation with statistical process controls. The reliability and lifetime. LTC3649I is guaranteed over the full –40°C to 125°C operating junction
Note 2:
All voltages are referred to V temperature range. Note that the maximum ambient temperature SGND/VPGND.
Note 3:
Transient absolute maximum voltages should not be applied for consistent with these specifications is determined by specific operating more than 4% of the switching duty cycle. conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors.
Note 4:
VOUT can be programmed to VIN if the ISET pin is driven to that voltage. If a resistor is used to program V
Note 6:
The quiescent current in FC mode does not include switching loss ISET, the current into the ISET pin will decrease as V of the power FETs. ISET approaches VIN. Refer to the ISET current vs VISET graph as an example and reference. Furthermore, during high I
Note 7:
This IC includes overtemperature protection that is intended OUT and high duty cycle operation, V to protect the device during momentary overload conditions. Junction OUT may be limited by the voltage drop across the top switch. Refer to the High Duty Cycle/Dropout Operation section for temperature will exceed 125°C when overtemperature protection is active. more details. Continuous operation above the specified maximum operating junction
Note 5:
The LTC3649 is tested under pulsed load conditions such that temperature may impair device reliability. TJ ≈ TA. The LTC3649E is guaranteed to meet specifications from
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Regulation ISET Current vs Temperature ISET Current vs VISET
102 50.5 51 50.3 50 101 (%) OUT 50.1 49 100 (µA) (µA) I SET 49.9 I SET 48 NORMALIZED V 99 49.7 47 V FC MODE IN = 24V V BM OUT = 5V VIN = 24V 98 49.5 46 0 1 2 3 4 –55 –35 –15 5 25 45 65 85 105 125 0 4 8 12 16 20 24 IOUT (A) TEMPERATURE (°C) VISET 3649 G01 3649 G02 3649 G03
ISET Voltage Line Regulation Quiescent Current vs Temperature Shutdown Current vs VIN
5.01 500 20 SLEEP 5.00 400 16 4.99 300 12 (V) (µA) (µA) V ISET I Q I Q 4.97 200 8 4.96 100 4 RISET = 100kΩ SHUTDOWN 4.95 0 0 0 10 20 30 40 50 60 –55 –35 –15 5 25 45 65 85 105 125 0 10 20 30 40 50 60 VIN (V) TEMPERATURE (°C) VIN (V) 3649 G04 3649 G05 3649 G06 3649fb 4 For more information www.linear.com/LTC3649 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings 0°C to 85°C junction temperature. Specifications over the –40°C to may cause permanent damage to the device. Exposure to any Absolute 125°C operating junction temperature range are assured by design, Maximum Rating condition for extended periods may affect device characterization and correlation with statistical process controls. The reliability and lifetime. LTC3649I is guaranteed over the full –40°C to 125°C operating junction
Note 2:
All voltages are referred to V temperature range. Note that the maximum ambient temperature SGND/VPGND.
Note 3:
Transient absolute maximum voltages should not be applied for consistent with these specifications is determined by specific operating more than 4% of the switching duty cycle. conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors.
Note 4:
VOUT can be programmed to VIN if the ISET pin is driven to that voltage. If a resistor is used to program V
Note 6:
The quiescent current in FC mode does not include switching loss ISET, the current into the ISET pin will decrease as V of the power FETs. ISET approaches VIN. Refer to the ISET current vs VISET graph as an example and reference. Furthermore, during high I
Note 7:
This IC includes overtemperature protection that is intended OUT and high duty cycle operation, V to protect the device during momentary overload conditions. Junction OUT may be limited by the voltage drop across the top switch. Refer to the High Duty Cycle/Dropout Operation section for temperature will exceed 125°C when overtemperature protection is active. more details. Continuous operation above the specified maximum operating junction
Note 5:
The LTC3649 is tested under pulsed load conditions such that temperature may impair device reliability. TJ ≈ TA. The LTC3649E is guaranteed to meet specifications from
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Regulation ISET Current vs Temperature ISET Current vs VISET
102 50.5 51 50.3 50 101 (%) OUT 50.1 49 100 (µA) (µA) I SET 49.9 I SET 48 NORMALIZED V 99 49.7 47 V FC MODE IN = 24V V BM OUT = 5V VIN = 24V 98 49.5 46 0 1 2 3 4 –55 –35 –15 5 25 45 65 85 105 125 0 4 8 12 16 20 24 IOUT (A) TEMPERATURE (°C) VISET 3649 G01 3649 G02 3649 G03
ISET Voltage Line Regulation Quiescent Current vs Temperature Shutdown Current vs VIN
5.01 500 20 SLEEP 5.00 400 16 4.99 300 12 (V) (µA) (µA) V ISET I Q I Q 4.97 200 8 4.96 100 4 RISET = 100kΩ SHUTDOWN 4.95 0 0 0 10 20 30 40 50 60 –55 –35 –15 5 25 45 65 85 105 125 0 10 20 30 40 50 60 VIN (V) TEMPERATURE (°C) VIN (V) 3649 G04 3649 G05 3649 G06 3649fb 4 For more information www.linear.com/LTC3649 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
