Datasheet LTC3769 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | 60V Low IQ Synchronous Boost Controller |
| Páginas / Página | 32 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 448 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3769
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C, VBIAS = 12V, unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Linear Regulator
Internal VCC Voltage 6V < VBIAS < 60V, VEXTVCC = 0 5.2 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 50mA 0.5 2 % Internal VCC Voltage 6V < VEXTVCC < 13V 5.2 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 40mA, VEXTVCC = 8.5V 0.5 2 % EXTVCC Switchover Voltage EXTVCC Ramping Positive l 4.5 4.8 5 V EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
Programmable Frequency RFREQ = 25k 105 kHz RFREQ = 60k 335 400 465 kHz RFREQ = 100k 760 kHz fLOW Lowest Fixed Frequency VFREQ = 0V 320 350 380 kHz Highest Fixed Frequency VFREQ = INTVCC 488 535 585 kHz Synchronizable Frequency PLLIN/MODE = External Clock l 75 850 kHz
PGOOD Output
PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V PGOOD Leakage Current VPGOOD = 5V ±1 µA PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % Hysteresis 2.5 % VFB Ramping Positive 8 10 12 % Hysteresis 2.5 % PGOOD Delay PGOOD Going High to Low 45 µs OV Protection Threshold VFB Ramping Positive, OVMODE = 0V 1.296 1.32 1.344 V
BOOST Charge Pump
BOOST Charge Pump Available Output VSW = 12V; VBOOST – VSW = 4.5V; 55 µA Current FREQ = 0V, Forced Continuous or Pulse-Skipping Mode
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature (TA, in °C) and power dissipation (PD, in Watts) according to may cause permanent damage to the device. Exposure to any Absolute the formula: TJ = TA + (PD • θJA), where θJA = 47°C/W for the QFN package Maximum Rating condition for extended periods may affect device and θJA = 38°C/W for the TSSOP package. reliability and lifetime.
Note 3:
This IC includes overtemperature protection that is intended to
Note 2:
The LTC3769 is tested under pulsed load conditions such that protect the device during momentary overload conditions. The maximum TJ ≈ TA. The LTC3769E is guaranteed to meet specifications from rated junction temperature will be exceeded when this protection is active. 0°C to 85°C junction temperature. Specifications over the –40°C to Continuous operation above the specified absolute maximum operating 125°C operating junction temperature range are assured by design, junction temperature may impair device reliability or permanently damage characterization and correlation with statistical process controls. The the device. LTC3769I is guaranteed over the –40°C to 125°C operating junction
Note 4:
The LTC3769 is tested in a feedback loop that servos VFB to the temperature range, the LTC3769H is guaranteed over the –40°C to 150°C output of the error amplifier while maintaining ITH at the midpoint of the operating temperature range and the LTC3769MP is tested and guaranteed current limit range. over the full –55°C to 150°C operating junction temperature range. High
Note 5:
Dynamic supply current is higher due to the gate charge being junction temperatures degrade operating lifetimes; operating lifetime delivered at the switching frequency. is derated for junction temperatures greater than 125°C. Note that the maximum ambient temperature consistent with these specifications is
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay determined by specific operating conditions in conjunction with board times are measured using 50% levels. layout, the rated package thermal impedance and other environmental
Note 7:
See Minimum On-Time Considerations in the Applications factors. The junction temperature (T Information section. J, in °C) is calculated from the ambient 3769fa 4 For more information www.linear.com/LTC3769 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History 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, VBIAS = 12V, unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Linear Regulator
Internal VCC Voltage 6V < VBIAS < 60V, VEXTVCC = 0 5.2 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 50mA 0.5 2 % Internal VCC Voltage 6V < VEXTVCC < 13V 5.2 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 40mA, VEXTVCC = 8.5V 0.5 2 % EXTVCC Switchover Voltage EXTVCC Ramping Positive l 4.5 4.8 5 V EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
Programmable Frequency RFREQ = 25k 105 kHz RFREQ = 60k 335 400 465 kHz RFREQ = 100k 760 kHz fLOW Lowest Fixed Frequency VFREQ = 0V 320 350 380 kHz Highest Fixed Frequency VFREQ = INTVCC 488 535 585 kHz Synchronizable Frequency PLLIN/MODE = External Clock l 75 850 kHz
PGOOD Output
PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V PGOOD Leakage Current VPGOOD = 5V ±1 µA PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % Hysteresis 2.5 % VFB Ramping Positive 8 10 12 % Hysteresis 2.5 % PGOOD Delay PGOOD Going High to Low 45 µs OV Protection Threshold VFB Ramping Positive, OVMODE = 0V 1.296 1.32 1.344 V
BOOST Charge Pump
BOOST Charge Pump Available Output VSW = 12V; VBOOST – VSW = 4.5V; 55 µA Current FREQ = 0V, Forced Continuous or Pulse-Skipping Mode
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature (TA, in °C) and power dissipation (PD, in Watts) according to may cause permanent damage to the device. Exposure to any Absolute the formula: TJ = TA + (PD • θJA), where θJA = 47°C/W for the QFN package Maximum Rating condition for extended periods may affect device and θJA = 38°C/W for the TSSOP package. reliability and lifetime.
Note 3:
This IC includes overtemperature protection that is intended to
Note 2:
The LTC3769 is tested under pulsed load conditions such that protect the device during momentary overload conditions. The maximum TJ ≈ TA. The LTC3769E is guaranteed to meet specifications from rated junction temperature will be exceeded when this protection is active. 0°C to 85°C junction temperature. Specifications over the –40°C to Continuous operation above the specified absolute maximum operating 125°C operating junction temperature range are assured by design, junction temperature may impair device reliability or permanently damage characterization and correlation with statistical process controls. The the device. LTC3769I is guaranteed over the –40°C to 125°C operating junction
Note 4:
The LTC3769 is tested in a feedback loop that servos VFB to the temperature range, the LTC3769H is guaranteed over the –40°C to 150°C output of the error amplifier while maintaining ITH at the midpoint of the operating temperature range and the LTC3769MP is tested and guaranteed current limit range. over the full –55°C to 150°C operating junction temperature range. High
Note 5:
Dynamic supply current is higher due to the gate charge being junction temperatures degrade operating lifetimes; operating lifetime delivered at the switching frequency. is derated for junction temperatures greater than 125°C. Note that the maximum ambient temperature consistent with these specifications is
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay determined by specific operating conditions in conjunction with board times are measured using 50% levels. layout, the rated package thermal impedance and other environmental
Note 7:
See Minimum On-Time Considerations in the Applications factors. The junction temperature (T Information section. J, in °C) is calculated from the ambient 3769fa 4 For more information www.linear.com/LTC3769 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts