Datasheet LTC3895 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 150V Low IQ, Synchronous Step-Down DC/DC Controller |
| Pages / Page | 38 / 4 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
Text Version of Document
LTC3895
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 = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG = FLOAT unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG Pull-up On-Resistance VDRVSET = INTVCC 2.2 Ω TG Pull-down On-Resistance 1.0 Ω BG Pull-up On-Resistance VDRVSET = INTVCC 2.0 Ω BG Pull-down On-Resistance 1.0 Ω BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 11 Ω TG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns BG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF each driver, VDRVSET = INTVCC Synchronous Switch-On Delay Time 55 ns Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF each driver, VDRVSET = INTVCC Top Switch-On Delay Time 50 ns tON(MIN) TG Minimum On-Time (Note 7) VDRVSET = INTVCC 80 ns
Charge Pump for High Side Driver Supply
ICPUMP Charge Pump Output Current VBOOST =16V, VSW = 12V, VFREQ = 0V 65 µA VBOOST =19V, VSW = 12V, VFREQ = 0V 55 µA
DRVCC LDO Regulator
DRVCC Voltage from NDRV LDO NDRV Driving External NFET, VEXTVCC = 0V Regulator 7V < VIN < 150V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VIN < 150V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from NDRV NDRV Driving External NFET LDO Regulator ICC = 0mA to 50mA, VEXTVCC = 0V 0 1.0 % DRVCC Voltage from Internal VIN LDO NDRV = DRVCC, VEXTVCC = 0V 7V < VIN < 150V, DRVSET = 0V 5.6 5.85 6.1 V 11V < VIN < 150V, DRVSET = INTVCC 9.5 9.85 10.3 V DRVCC Load Regulation from VIN LDO ICC = 0mA to 50mA, VEXTVCC = 0V DRVSET = 0V 1.4 2.5 % DRVSET = INTVCC 0.9 2.0 % DRVCC Voltage from Internal EXTVCC 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V LDO 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from Internal ICC = 0mA to 50mA EXTVCC LDO DRVSET = 0V, VEXTVCC = 8.5V 0.7 2.0 % DRVSET = INTVCC, VEXTVCC = 13V 0.5 2.0 % EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVUV = 0V 4.5 4.7 4.9 V DRVUV = INTVCC, DRVSET = INTVCC 7.4 7.7 8.0 V EXTVCC Hysteresis 250 mV Programmable DRVCC RDRVSET = 50k NDRV Driving External NFET, VEXTVCC = 0V 5.0 V Programmable DRVCC RDRVSET = 70k NDRV Driving External NFET, VEXTVCC = 0V 6.4 7.0 7.6 V Programmable DRVCC RDRVSET = 90k NDRV Driving External NFET, VEXTVCC = 0V 9.0 V 3895fa 4 For more information www.linear.com/LTC3895 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 (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG = FLOAT unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG Pull-up On-Resistance VDRVSET = INTVCC 2.2 Ω TG Pull-down On-Resistance 1.0 Ω BG Pull-up On-Resistance VDRVSET = INTVCC 2.0 Ω BG Pull-down On-Resistance 1.0 Ω BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 11 Ω TG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns BG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF each driver, VDRVSET = INTVCC Synchronous Switch-On Delay Time 55 ns Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF each driver, VDRVSET = INTVCC Top Switch-On Delay Time 50 ns tON(MIN) TG Minimum On-Time (Note 7) VDRVSET = INTVCC 80 ns
Charge Pump for High Side Driver Supply
ICPUMP Charge Pump Output Current VBOOST =16V, VSW = 12V, VFREQ = 0V 65 µA VBOOST =19V, VSW = 12V, VFREQ = 0V 55 µA
DRVCC LDO Regulator
DRVCC Voltage from NDRV LDO NDRV Driving External NFET, VEXTVCC = 0V Regulator 7V < VIN < 150V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VIN < 150V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from NDRV NDRV Driving External NFET LDO Regulator ICC = 0mA to 50mA, VEXTVCC = 0V 0 1.0 % DRVCC Voltage from Internal VIN LDO NDRV = DRVCC, VEXTVCC = 0V 7V < VIN < 150V, DRVSET = 0V 5.6 5.85 6.1 V 11V < VIN < 150V, DRVSET = INTVCC 9.5 9.85 10.3 V DRVCC Load Regulation from VIN LDO ICC = 0mA to 50mA, VEXTVCC = 0V DRVSET = 0V 1.4 2.5 % DRVSET = INTVCC 0.9 2.0 % DRVCC Voltage from Internal EXTVCC 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V LDO 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from Internal ICC = 0mA to 50mA EXTVCC LDO DRVSET = 0V, VEXTVCC = 8.5V 0.7 2.0 % DRVSET = INTVCC, VEXTVCC = 13V 0.5 2.0 % EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVUV = 0V 4.5 4.7 4.9 V DRVUV = INTVCC, DRVSET = INTVCC 7.4 7.7 8.0 V EXTVCC Hysteresis 250 mV Programmable DRVCC RDRVSET = 50k NDRV Driving External NFET, VEXTVCC = 0V 5.0 V Programmable DRVCC RDRVSET = 70k NDRV Driving External NFET, VEXTVCC = 0V 6.4 7.0 7.6 V Programmable DRVCC RDRVSET = 90k NDRV Driving External NFET, VEXTVCC = 0V 9.0 V 3895fa 4 For more information www.linear.com/LTC3895 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
