Datasheet LTC3891 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Low IQ, 60V Synchronous Step-Down Controller |
| Pages / Page | 32 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 691 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating junction
Model Line for this Datasheet
Text Version of Document
LTC3891
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full 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 Gate Driver
TG Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG tr TG Transition Time: (Note 6) TG tf Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 16 ns BG tr BG Transition Time: (Note 6) BG tf Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 13 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF 30 ns Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF 30 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 95 ns
INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 6V < VIN < 60V, VEXTVCC = 0V 4.85 5.1 5.35 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 1.1 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V 4.85 5.1 5.35 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 50mA, 0.6 1.1 % VEXTVCC = 8.5V VEXTVCC EXTVCC Switchover Voltage ICC = 0mA to 50mA, 4.5 4.7 4.9 V EXTVCC Ramping Positive VLDOHYS EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
f25kΩ Programmable Frequency RFREQ = 25k; 105 kHz PLLIN/MODE = DC Voltage f65kΩ Programmable Frequency RFREQ = 65k; 375 440 505 kHz PLLIN/MODE = DC Voltage f105kΩ Programmable Frequency RFREQ =105k; 835 kHz PLLIN/MODE = DC Voltage fLOW Low Fixed Frequency VFREQ = 0V; 320 350 380 kHz PLLIN/MODE = DC Voltage fHIGH High Fixed Frequency VFREQ = INTVCC; 485 535 585 kHz PLLIN/MODE = DC Voltage fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 750 kHz
PGOOD1 Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG 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 % tPG Delay for Reporting a Fault 25 µs 3891fa 4 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 Revision History Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full 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 Gate Driver
TG Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG tr TG Transition Time: (Note 6) TG tf Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 16 ns BG tr BG Transition Time: (Note 6) BG tf Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 13 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF 30 ns Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF 30 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 95 ns
INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 6V < VIN < 60V, VEXTVCC = 0V 4.85 5.1 5.35 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 1.1 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V 4.85 5.1 5.35 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 50mA, 0.6 1.1 % VEXTVCC = 8.5V VEXTVCC EXTVCC Switchover Voltage ICC = 0mA to 50mA, 4.5 4.7 4.9 V EXTVCC Ramping Positive VLDOHYS EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
f25kΩ Programmable Frequency RFREQ = 25k; 105 kHz PLLIN/MODE = DC Voltage f65kΩ Programmable Frequency RFREQ = 65k; 375 440 505 kHz PLLIN/MODE = DC Voltage f105kΩ Programmable Frequency RFREQ =105k; 835 kHz PLLIN/MODE = DC Voltage fLOW Low Fixed Frequency VFREQ = 0V; 320 350 380 kHz PLLIN/MODE = DC Voltage fHIGH High Fixed Frequency VFREQ = INTVCC; 485 535 585 kHz PLLIN/MODE = DC Voltage fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 750 kHz
PGOOD1 Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG 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 % tPG Delay for Reporting a Fault 25 µs 3891fa 4 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 Revision History Typical Application Related Parts
