Datasheet LTC3897-2 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | PolyPhase Synchronous Boost Controller with Input/Output Protection |
| Pages / Page | 50 / 6 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | A |
| File Format / Size | PDF / 3.9 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VBIAS = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DG Pin Pull-Down Current DG = CS + 5V, CS – IS+ = –0.2V l 60 130 mA DG = CS + 5V, SGEN = DGEN = 0V l 0.4 1 mA ΔVSD Source-Drain Regulation Voltage, (VCS DG – CS = 2.5V, VIN = CS = 4.2V to 70V l 20 30 40 mV − VIS+) DG Turn Off Propagation Delay in Fault CS – IS+ = –1V, DG High to Low l 0.6 2 µS Condition
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
This IC includes overtemperature protection that is intended to may cause permanent damage to the device. Exposure to any Absolute protect the device during momentary overload conditions. The maximum Maximum Rating condition for extended periods may affect device rated junction temperature will be exceeded when this protection is active. reliability and lifetime. Continuous operation above the specified absolute maximum operating
Note 2:
The LTC3897-2 is tested under pulsed load conditions such junction temperature may impair device reliability or permanently damage that T the device. J ≈ TA. The LTC3897E-2 is guaranteed to meet specifications from 0°C to 85°C junction temperature. Specifications over the –40°C
Note 4:
The LTC3897-2 is tested in a feedback loop that servos VFB to the to 125°C operating junction temperature range are assured by design, output of the error amplifier while maintaining ITH at the midpoint of the characterization and correlation with statistical process controls. The current limit range. LTC3897I-2 is guaranteed over the –40°C to 125°C operating junction
Note 5:
Dynamic supply current is higher due to the gate charge being temperature range. The LTC3897H-2 is guaranteed over the –40°C to delivered at the switching frequency. 150°C operating temperature range. High junction temperatures degrade
Note 6:
Rise and fall times are measured using 10% and 90% levels. operation lifetime. Operation lifetime is derated for junction temperatures Delay times are measured using 50% levels. greater than 125°C. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating
Note 7:
See Minimum On-Time Considerations in the Applications conditions in conjunction with board layout, the rated package thermal Information section. impedance and other environmental factors. The junction temperature
Note 8:
Internal clamps limit the SG and DG pins to minimum of 10V (T above the CS pin. Driving these pins to voltages beyond the clamp may J, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (P damage the device. D, in watts) according to the formula:
T
Note 9:
Do not apply a voltage or current source to these pins. They must J = TA + (PD • θJA), where θJA = 36°C/W for the QFN package. be connected to capacitive loads only, otherwise permanent damage may occur.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Efficiency and Power Loss Efficiency and Power Loss vs Output Current vs Output Current
100 100k 100 100k BURST EFFICIENCY BURST EFFICIENCY 90 90 80 FCM LOSS 10k 80 10k POWER LOSS (mW) POWER LOSS (mW) 70 70 PULSE–SKIPPING 60 LOSS 1k 60 1k BURST LOSS BURST LOSS 50 50 PULSE–SKIPPING 40 EFFICIENCY FCM EFFICIENCY 100 40 100 EFFICIENCY (%) EFFICIENCY (%) 30 30 VIN = 12V 20 V 10 20 V 10 IN = 12V OUT = 24V 10 V Burst Mode OPERATION OUT = 24V 10 FIGURE 17 CIRCUIT FIGURE 17 CIRCUIT 0 1 0 1 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 38972 G01 38972 G02 Rev. A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VBIAS = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DG Pin Pull-Down Current DG = CS + 5V, CS – IS+ = –0.2V l 60 130 mA DG = CS + 5V, SGEN = DGEN = 0V l 0.4 1 mA ΔVSD Source-Drain Regulation Voltage, (VCS DG – CS = 2.5V, VIN = CS = 4.2V to 70V l 20 30 40 mV − VIS+) DG Turn Off Propagation Delay in Fault CS – IS+ = –1V, DG High to Low l 0.6 2 µS Condition
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
This IC includes overtemperature protection that is intended to may cause permanent damage to the device. Exposure to any Absolute protect the device during momentary overload conditions. The maximum Maximum Rating condition for extended periods may affect device rated junction temperature will be exceeded when this protection is active. reliability and lifetime. Continuous operation above the specified absolute maximum operating
Note 2:
The LTC3897-2 is tested under pulsed load conditions such junction temperature may impair device reliability or permanently damage that T the device. J ≈ TA. The LTC3897E-2 is guaranteed to meet specifications from 0°C to 85°C junction temperature. Specifications over the –40°C
Note 4:
The LTC3897-2 is tested in a feedback loop that servos VFB to the to 125°C operating junction temperature range are assured by design, output of the error amplifier while maintaining ITH at the midpoint of the characterization and correlation with statistical process controls. The current limit range. LTC3897I-2 is guaranteed over the –40°C to 125°C operating junction
Note 5:
Dynamic supply current is higher due to the gate charge being temperature range. The LTC3897H-2 is guaranteed over the –40°C to delivered at the switching frequency. 150°C operating temperature range. High junction temperatures degrade
Note 6:
Rise and fall times are measured using 10% and 90% levels. operation lifetime. Operation lifetime is derated for junction temperatures Delay times are measured using 50% levels. greater than 125°C. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating
Note 7:
See Minimum On-Time Considerations in the Applications conditions in conjunction with board layout, the rated package thermal Information section. impedance and other environmental factors. The junction temperature
Note 8:
Internal clamps limit the SG and DG pins to minimum of 10V (T above the CS pin. Driving these pins to voltages beyond the clamp may J, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (P damage the device. D, in watts) according to the formula:
T
Note 9:
Do not apply a voltage or current source to these pins. They must J = TA + (PD • θJA), where θJA = 36°C/W for the QFN package. be connected to capacitive loads only, otherwise permanent damage may occur.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Efficiency and Power Loss Efficiency and Power Loss vs Output Current vs Output Current
100 100k 100 100k BURST EFFICIENCY BURST EFFICIENCY 90 90 80 FCM LOSS 10k 80 10k POWER LOSS (mW) POWER LOSS (mW) 70 70 PULSE–SKIPPING 60 LOSS 1k 60 1k BURST LOSS BURST LOSS 50 50 PULSE–SKIPPING 40 EFFICIENCY FCM EFFICIENCY 100 40 100 EFFICIENCY (%) EFFICIENCY (%) 30 30 VIN = 12V 20 V 10 20 V 10 IN = 12V OUT = 24V 10 V Burst Mode OPERATION OUT = 24V 10 FIGURE 17 CIRCUIT FIGURE 17 CIRCUIT 0 1 0 1 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 38972 G01 38972 G02 Rev. A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts
