Datasheet LTC3807 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability |
| Páginas / Página | 34 / 5 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 572 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the specified
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Versión de texto del documento
LTC3807
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, VRUN = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Leakage Current VPGOOD = 5V ±1 µA PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –13 –10 –7 % Hysteresis 2.5 % VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % Delay for Reporting a Fault 25 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings the formula: may cause permanent damage to the device. Exposure to any Absolute TJ = TA + (PD • θJA), where θJA is 43°C/W for the QFN or 38°C/W for the Maximum Rating condition for extended periods may affect device TSSOP. reliability and lifetime.
Note 4:
The LTC3807 is tested in a feedback loop that servos VITH to a
Note 2:
The LTC3807 is tested under pulsed load conditions such that specified voltage and measures the resultant VFB. The specification at TJ ≈ TA. The LTC3807E is guaranteed to meet performance specifications 85°C is not tested in production and is assured by design, characterization from 0°C to 85°C. Specifications over the –40°C to 125°C operating and correlation to production testing at other temperatures (125°C for junction temperature range are assured by design, characterization and the LTC3807E/LTC3807I, 150°C for the LTC3807H/LTC3807MP). For the correlation with statistical process controls. The LTC3807I is guaranteed LTC3807MP, the specification at –40°C is not tested in production and is over the –40°C to 125°C operating junction temperature range, the assured by design, characterization and correlation to production testing LTC3807H is guaranteed over the –40°C to 150°C operating junction at –55°C. temperature range and the LTC3807MP is tested and guaranteed over
Note 5:
Dynamic supply current is higher due to the gate charge being the –55°C to 150°C operating junction temperature range. High junction delivered at the switching frequency. See Applications Information. temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. Note that the maximum
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay ambient temperature consistent with these specifications is determined by times are measured using 50% levels specific operating conditions in conjunction with board layout, the rated
Note 7:
The minimum on-time condition is specified for an inductor package thermal impedance and other environmental factors. peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time
Note 3:
The junction temperature (T Considerations in the Applications Information section). J, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage
100 10000 100 V 100 IN = 12V BURST EFFICIENCY V 90 V OUT = 8.5V OUT = 3.3V 90 98 V VOUT = 8.5V 80 1000 OUT = 3.3V 80 96 POWER LOSS (mW) 70 FCM LOSS 70 94 60 100 60 92 50 BURST LOSS 50 90 PULSE-SKIPPING 40 10 LOSS 40 88 VOUT = 3.3V EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 86 20 FCM EFFICIENCY 1 20 84 Burst Mode OPERATION 10 PULSE-SKIPPING 10 82 EFFICIENCY V I 0 0.1 IN = 12V 0 LOAD = 2A 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) FIGURE 12 CIRCUIT 3807 G01 3807 G02 FIGURES 12, 14 CIRCUITS 3807 G03 FIGURES 12, 14 CIRCUITS 3807fa For more information www.linear.com/LTC3807 5 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 Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History 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, VRUN = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Leakage Current VPGOOD = 5V ±1 µA PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –13 –10 –7 % Hysteresis 2.5 % VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % Delay for Reporting a Fault 25 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings the formula: may cause permanent damage to the device. Exposure to any Absolute TJ = TA + (PD • θJA), where θJA is 43°C/W for the QFN or 38°C/W for the Maximum Rating condition for extended periods may affect device TSSOP. reliability and lifetime.
Note 4:
The LTC3807 is tested in a feedback loop that servos VITH to a
Note 2:
The LTC3807 is tested under pulsed load conditions such that specified voltage and measures the resultant VFB. The specification at TJ ≈ TA. The LTC3807E is guaranteed to meet performance specifications 85°C is not tested in production and is assured by design, characterization from 0°C to 85°C. Specifications over the –40°C to 125°C operating and correlation to production testing at other temperatures (125°C for junction temperature range are assured by design, characterization and the LTC3807E/LTC3807I, 150°C for the LTC3807H/LTC3807MP). For the correlation with statistical process controls. The LTC3807I is guaranteed LTC3807MP, the specification at –40°C is not tested in production and is over the –40°C to 125°C operating junction temperature range, the assured by design, characterization and correlation to production testing LTC3807H is guaranteed over the –40°C to 150°C operating junction at –55°C. temperature range and the LTC3807MP is tested and guaranteed over
Note 5:
Dynamic supply current is higher due to the gate charge being the –55°C to 150°C operating junction temperature range. High junction delivered at the switching frequency. See Applications Information. temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. Note that the maximum
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay ambient temperature consistent with these specifications is determined by times are measured using 50% levels specific operating conditions in conjunction with board layout, the rated
Note 7:
The minimum on-time condition is specified for an inductor package thermal impedance and other environmental factors. peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time
Note 3:
The junction temperature (T Considerations in the Applications Information section). J, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage
100 10000 100 V 100 IN = 12V BURST EFFICIENCY V 90 V OUT = 8.5V OUT = 3.3V 90 98 V VOUT = 8.5V 80 1000 OUT = 3.3V 80 96 POWER LOSS (mW) 70 FCM LOSS 70 94 60 100 60 92 50 BURST LOSS 50 90 PULSE-SKIPPING 40 10 LOSS 40 88 VOUT = 3.3V EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 86 20 FCM EFFICIENCY 1 20 84 Burst Mode OPERATION 10 PULSE-SKIPPING 10 82 EFFICIENCY V I 0 0.1 IN = 12V 0 LOAD = 2A 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) FIGURE 12 CIRCUIT 3807 G01 3807 G02 FIGURES 12, 14 CIRCUITS 3807 G03 FIGURES 12, 14 CIRCUITS 3807fa For more information www.linear.com/LTC3807 5 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 Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Related Parts