Datasheet LTC3859AL (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ |
| Pages / Page | 44 / 5 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| Revision | B |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the specified operating
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LTC3859AL
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG1,2 Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG1,2 Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω BG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω TG Transition Time: (Note 6) TG1,2,3 tr Rise Time CLOAD = 3300pF 25 ns TG1,2,3 tf Fall Time CLOAD = 3300pF 16 ns BG Transition Time: (Note 6) BG1,2,3 tr Rise Time CLOAD = 3300pF 28 ns BG1,2,3 tf Fall Time CLOAD = 3300pF 13 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 30 ns Synchronous Switch-On Delay Time Boost (Channel 3) 70 ns BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 30 ns Top Switch-On Delay Time Boost (Channel 3) 70 ns tON(MIN)1,2 Buck Minimum On-Time (Note 7) 95 ns tON(MIN)3 Boost Minimum On-Time (Note 7) 120 ns
INTVCC Linear Regulator
VINTVCCVBIAS Internal VCC Voltage 6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOVBIAS INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 2 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 8.5V 0.7 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 200 mV
Oscillator and Phase-Locked Loop
f25k Programmable Frequency RFREQ = 25k; PLLIN/MODE = DC Voltage 115 kHz f65k Programmable Frequency RFREQ = 65k; PLLIN/MODE = DC Voltage 440 kHz f105k 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
VPGL1 PGOOD1 Voltage Low IPGOOD1 = 2mA 0.2 0.4 V IPGOOD1 PGOOD1 Leakage Current VPGOOD1 = 5V ±1 µA VPG1 PGOOD1 Trip Level VFB1 with Respect to Set Regulated Voltage VFB1 Ramping Negative –13 –10 –7 % Hysteresis 2.5 % VFB1 Ramping Positive 7 10 13 % Hysteresis 2.5 % Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information 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. VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG1,2 Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG1,2 Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω BG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω TG Transition Time: (Note 6) TG1,2,3 tr Rise Time CLOAD = 3300pF 25 ns TG1,2,3 tf Fall Time CLOAD = 3300pF 16 ns BG Transition Time: (Note 6) BG1,2,3 tr Rise Time CLOAD = 3300pF 28 ns BG1,2,3 tf Fall Time CLOAD = 3300pF 13 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 30 ns Synchronous Switch-On Delay Time Boost (Channel 3) 70 ns BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 30 ns Top Switch-On Delay Time Boost (Channel 3) 70 ns tON(MIN)1,2 Buck Minimum On-Time (Note 7) 95 ns tON(MIN)3 Boost Minimum On-Time (Note 7) 120 ns
INTVCC Linear Regulator
VINTVCCVBIAS Internal VCC Voltage 6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOVBIAS INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 2 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 8.5V 0.7 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 200 mV
Oscillator and Phase-Locked Loop
f25k Programmable Frequency RFREQ = 25k; PLLIN/MODE = DC Voltage 115 kHz f65k Programmable Frequency RFREQ = 65k; PLLIN/MODE = DC Voltage 440 kHz f105k 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
VPGL1 PGOOD1 Voltage Low IPGOOD1 = 2mA 0.2 0.4 V IPGOOD1 PGOOD1 Leakage Current VPGOOD1 = 5V ±1 µA VPG1 PGOOD1 Trip Level VFB1 with Respect to Set Regulated Voltage VFB1 Ramping Negative –13 –10 –7 % Hysteresis 2.5 % VFB1 Ramping Positive 7 10 13 % Hysteresis 2.5 % Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
