Datasheet LTC3867 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control |
| Páginas / Página | 36 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 394 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3867
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 = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG Transition Time TG tr Rise Time CLOAD = 3300pF 25 ns TG tf Fall Time CLOAD = 3300pF (Note 5) 25 ns BG Transition Time BG tr Rise Time CLOAD = 3300pF 25 ns BG tf Fall Time CLOAD = 3300pF (Note 5) 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay, CLOAD = 3300pF Each Driver 30 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay, CLOAD = 3300pF Each Driver 30 ns Top Switch-On Delay Time
Thermal Shutdown
IITSD Source Current IITSD = 500mV 20 µA VITSD Comparator Trip Point 950 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3867 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. Maximum Rating condition for extended periods may affect device
Note 4:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3867 is tested under pulsed load conditions such that
Note 5:
Rise and fall times are measured using 10% and 90% levels. Delay TJ ≈ TA. The LTC3867E is guaranteed to meet performance specifications times are measured using 50% levels. from 0°C to 85°C operating junction temperature. Specifications over
Note 6:
The minimum on-time condition corresponds to the on inductor the –40°C to 125°C operating junction temperature range are assured by peak-to-peak ripple current ≥40% of I design, characterization and correlation with statistical process controls. MAX (see Minimum On-Time Considerations in the Applications Information section). The LTC3867I is guaranteed to meet performance specifications over the full –40°C to 125°C operating junction temperature range. The maximum
Note 7:
Guaranteed by design. ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the package thermal impedance and other environmental factors. TJ is calculated from the ambient temperature, TA, and power dissipation, PD, according to the following formula: LTC3867UF: TJ = TA + (PD • 47°C/W) 3867f 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description 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 = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG Transition Time TG tr Rise Time CLOAD = 3300pF 25 ns TG tf Fall Time CLOAD = 3300pF (Note 5) 25 ns BG Transition Time BG tr Rise Time CLOAD = 3300pF 25 ns BG tf Fall Time CLOAD = 3300pF (Note 5) 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay, CLOAD = 3300pF Each Driver 30 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay, CLOAD = 3300pF Each Driver 30 ns Top Switch-On Delay Time
Thermal Shutdown
IITSD Source Current IITSD = 500mV 20 µA VITSD Comparator Trip Point 950 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3867 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. Maximum Rating condition for extended periods may affect device
Note 4:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3867 is tested under pulsed load conditions such that
Note 5:
Rise and fall times are measured using 10% and 90% levels. Delay TJ ≈ TA. The LTC3867E is guaranteed to meet performance specifications times are measured using 50% levels. from 0°C to 85°C operating junction temperature. Specifications over
Note 6:
The minimum on-time condition corresponds to the on inductor the –40°C to 125°C operating junction temperature range are assured by peak-to-peak ripple current ≥40% of I design, characterization and correlation with statistical process controls. MAX (see Minimum On-Time Considerations in the Applications Information section). The LTC3867I is guaranteed to meet performance specifications over the full –40°C to 125°C operating junction temperature range. The maximum
Note 7:
Guaranteed by design. ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the package thermal impedance and other environmental factors. TJ is calculated from the ambient temperature, TA, and power dissipation, PD, according to the following formula: LTC3867UF: TJ = TA + (PD • 47°C/W) 3867f 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts