Datasheet LTC3890-3 (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 … |
| File Format / Size | PDF / 1.3 Mb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the full operating junction
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LTC3890-3
elecTrical characTerisTics The
l
denotes the specifications which apply over the full 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 Output
VPGL PGOOD1 Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD1 Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD1 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 • 90°C/W) lifetime.
Note 4:
The LTC3890-3 is tested in a feedback loop that servos VITH1,2 to
Note 2:
The LTC3890-3 is tested under pulsed load condition such that a specified voltage and measures the resultant VFB. The specification at TJ ≈ TA.The LTC3890E-3 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 the junction temperature range are assured by design, characterization and LTC3890E-3/LTC3890I-3, 150°C for the LTC3890H-3/LTC3890MP-3). For correlation with statistical process controls. The LTC3890I-3 is guaranteed the LTC3890MP-3, the specification at –40°C is not tested in production over the –40°C to 125°C operating junction temperature range, the and is assured by design, characterization and correlation to production LTC3890H-3 is guaranteed over the –40°C to 150°C operating junction testing at –55°C. temperature range and the LTC3890MP-3 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. delivered at the switching frequency. See the Applications information section. 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
Note 7:
The minimum on-time condition is specified for an inductor peak- determined by specific operating conditions in conjunction with board layout, to-peak ripple current ≥ of I the rated package thermal impedance and other environmental factors. MAX (See Minimum On-Time Considerations in the Applications Information section). 38903f 4 For more information www.linear.com/3890-3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Typical Performance Characteristics Operation Package Description Typical Application
elecTrical characTerisTics The
l
denotes the specifications which apply over the full 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 Output
VPGL PGOOD1 Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD1 Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD1 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 • 90°C/W) lifetime.
Note 4:
The LTC3890-3 is tested in a feedback loop that servos VITH1,2 to
Note 2:
The LTC3890-3 is tested under pulsed load condition such that a specified voltage and measures the resultant VFB. The specification at TJ ≈ TA.The LTC3890E-3 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 the junction temperature range are assured by design, characterization and LTC3890E-3/LTC3890I-3, 150°C for the LTC3890H-3/LTC3890MP-3). For correlation with statistical process controls. The LTC3890I-3 is guaranteed the LTC3890MP-3, the specification at –40°C is not tested in production over the –40°C to 125°C operating junction temperature range, the and is assured by design, characterization and correlation to production LTC3890H-3 is guaranteed over the –40°C to 150°C operating junction testing at –55°C. temperature range and the LTC3890MP-3 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. delivered at the switching frequency. See the Applications information section. 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
Note 7:
The minimum on-time condition is specified for an inductor peak- determined by specific operating conditions in conjunction with board layout, to-peak ripple current ≥ of I the rated package thermal impedance and other environmental factors. MAX (See Minimum On-Time Considerations in the Applications Information section). 38903f 4 For more information www.linear.com/3890-3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Typical Performance Characteristics Operation Package Description Typical Application
