Datasheet LTC3890 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller |
| Pages / Page | 40 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | D |
| File Format / Size | PDF / 805 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3890
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 30 ns Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 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, VEXTVCC = 8.5V 0.6 1.1 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 4.9 V VLDOHYS EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
f25kΩ Programmable Frequency RFREQ = 25k, PLLIN/MODE = DC Voltage 105 kHz f65kΩ Programmable Frequency RFREQ = 65k, PLLIN/MODE = DC Voltage 375 440 505 kHz f105kΩ Programmable Frequency RFREQ = 105k, PLLIN/MODE = DC Voltage 835 kHz fLOW Low Fixed Frequency VFREQ = 0V, PLLIN/MODE = DC Voltage 320 350 380 kHz fHIGH High Fixed Frequency VFREQ = INTVCC, PLLIN/MODE = DC Voltage 485 535 585 kHz fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 850 kHz
PGOOD1 and PGOOD2 Outputs
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 with Respect to Set Regulated Voltage VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % tPG Delay for Reporting a Fault 25 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Ratings for extended periods may affect device reliability and TJ = TA + (PD • 34°C/W) lifetime.
Note 4:
The LTC3890 is tested in a feedback loop that servos VITH1,2 to
Note 2:
The LTC3890 is tested under pulsed load conditions such that a specified voltage and measures the resultant VFB. The specification at TJ ≈ TA. The LTC3890E 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 LTC3890E/LTC3890I, 150°C for the LTC3890H/LTC3890MP). For the correlation with statistical process controls. The LTC3890I is guaranteed LTC3890MP, 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 LTC3890H is guaranteed over the –40°C to 150°C operating junction at –55°C. temperature range and the LTC3890MP is tested and guaranteed over the
Note 5:
Dynamic supply current is higher due to the gate charge being –55°C to 150°C operating junction temperature range. delivered at the switching frequency. See Applications information. High junction temperatures degrade operating lifetimes; operating lifetime
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay is derated for junction temperatures greater than 125°C. Note that the times are measured using 50% levels. maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board
Note 7:
The minimum on-time condition is specified for an inductor layout, the rated package thermal impedance and other environmental peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time factors. Considerations in the Applications Information section). Rev. D 4 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 Functional Diagram Operation Applications Information Typical Applications Package Description 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. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 30 ns Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 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, VEXTVCC = 8.5V 0.6 1.1 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 4.9 V VLDOHYS EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
f25kΩ Programmable Frequency RFREQ = 25k, PLLIN/MODE = DC Voltage 105 kHz f65kΩ Programmable Frequency RFREQ = 65k, PLLIN/MODE = DC Voltage 375 440 505 kHz f105kΩ Programmable Frequency RFREQ = 105k, PLLIN/MODE = DC Voltage 835 kHz fLOW Low Fixed Frequency VFREQ = 0V, PLLIN/MODE = DC Voltage 320 350 380 kHz fHIGH High Fixed Frequency VFREQ = INTVCC, PLLIN/MODE = DC Voltage 485 535 585 kHz fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 850 kHz
PGOOD1 and PGOOD2 Outputs
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 with Respect to Set Regulated Voltage VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % tPG Delay for Reporting a Fault 25 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Ratings for extended periods may affect device reliability and TJ = TA + (PD • 34°C/W) lifetime.
Note 4:
The LTC3890 is tested in a feedback loop that servos VITH1,2 to
Note 2:
The LTC3890 is tested under pulsed load conditions such that a specified voltage and measures the resultant VFB. The specification at TJ ≈ TA. The LTC3890E 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 LTC3890E/LTC3890I, 150°C for the LTC3890H/LTC3890MP). For the correlation with statistical process controls. The LTC3890I is guaranteed LTC3890MP, 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 LTC3890H is guaranteed over the –40°C to 150°C operating junction at –55°C. temperature range and the LTC3890MP is tested and guaranteed over the
Note 5:
Dynamic supply current is higher due to the gate charge being –55°C to 150°C operating junction temperature range. delivered at the switching frequency. See Applications information. High junction temperatures degrade operating lifetimes; operating lifetime
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay is derated for junction temperatures greater than 125°C. Note that the times are measured using 50% levels. maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board
Note 7:
The minimum on-time condition is specified for an inductor layout, the rated package thermal impedance and other environmental peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time factors. Considerations in the Applications Information section). Rev. D 4 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 Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
