Datasheet LTC7802 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| 页数 / 页 | 34 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 3.1 Mb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LTC7802
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, RUN1,2 > 1.25V, EXTVCC = 0V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Drivers
TG or BG On-Resistance Pull-Up 2.0 Ω Pull-Down 1.0 Ω TG or BG Transition Time (Note 6) Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns TG Off to BG On Delay CLOAD = 3300pF Each Driver 15 ns Synchronous Switch-On Delay Time BG Off to TG On Delay CLOAD = 3300pF Each Driver 15 ns Top Switch-On Delay Time tON(MIN)1,2 TG Minimum On-Time (Note 7) 40 ns Maximum Duty Factor for TG fOSC = 350kHz 98 99 %
INTVCC Low Dropout (LDO) Linear Regulator
INTVCC Regulation Point 4.9 5.1 5.3 V INTVCC Load Regulation ICC = 0mA to 100mA, VIN ≥ 6V 1.2 2 % ICC = 0mA to 100mA, VEXTVCC ≥ 6V 1.2 2 % EXTVCC LDO Switchover Voltage EXTVCC Rising 4.5 4.7 4.8 V EXTVCC Switchover Hysteresis 250 mV UVLO Undervoltage Lockout INTVCC Rising l 4.10 4.20 4.35 V INTVCC Falling l 3.75 3.85 4.00 V
Spread Spectrum Oscillator and Phase-Locked Loop
fOSC Low Fixed Frequency VFREQ = 0V, PLLIN/SPREAD = 0V 320 350 380 kHz High Fixed Frequency VFREQ = INTVCC, PLLIN/SPREAD = 0V l 2.0 2.25 2.5 MHz Programmable Frequency RFREQ = 374kΩ, PLLIN/SPREAD = 0V 100 kHz RFREQ = 75kΩ, PLLIN/SPREAD = 0V 450 500 550 kHz RFREQ = 12.1kΩ, PLLIN/SPREAD = 0V 3 MHz Synchronizable Frequency Range PLLIN/SPREAD = External Clock l 0.1 3 MHz PLLIN Input High Level l 2.2 V PLLIN Input Low Level l 0.5 V Spread Spectrum Frequency Range PLLIN/SPREAD = INTVCC (Relative to fOSC) Minimum Frequency –12 % Maximum Frequency 15 %
PGOOD1 and PGOOD2 Outputs
PGOOD Voltage Low IPGOOD1,2 = 2mA 0.2 0.4 V PGOOD Leakage Current VPGOOD1,2 = 5V ±1 µA PGOOD Trip Level VFB Rising 7 10 13 % VFB Relative to Set Regulation Point Hysteresis 2.5 % VFB Falling –13 –10 –7 % Hysteresis 2.5 % PGOOD Delay for Reporting a Fault 25 µs Rev. 0 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 Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, RUN1,2 > 1.25V, EXTVCC = 0V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Drivers
TG or BG On-Resistance Pull-Up 2.0 Ω Pull-Down 1.0 Ω TG or BG Transition Time (Note 6) Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns TG Off to BG On Delay CLOAD = 3300pF Each Driver 15 ns Synchronous Switch-On Delay Time BG Off to TG On Delay CLOAD = 3300pF Each Driver 15 ns Top Switch-On Delay Time tON(MIN)1,2 TG Minimum On-Time (Note 7) 40 ns Maximum Duty Factor for TG fOSC = 350kHz 98 99 %
INTVCC Low Dropout (LDO) Linear Regulator
INTVCC Regulation Point 4.9 5.1 5.3 V INTVCC Load Regulation ICC = 0mA to 100mA, VIN ≥ 6V 1.2 2 % ICC = 0mA to 100mA, VEXTVCC ≥ 6V 1.2 2 % EXTVCC LDO Switchover Voltage EXTVCC Rising 4.5 4.7 4.8 V EXTVCC Switchover Hysteresis 250 mV UVLO Undervoltage Lockout INTVCC Rising l 4.10 4.20 4.35 V INTVCC Falling l 3.75 3.85 4.00 V
Spread Spectrum Oscillator and Phase-Locked Loop
fOSC Low Fixed Frequency VFREQ = 0V, PLLIN/SPREAD = 0V 320 350 380 kHz High Fixed Frequency VFREQ = INTVCC, PLLIN/SPREAD = 0V l 2.0 2.25 2.5 MHz Programmable Frequency RFREQ = 374kΩ, PLLIN/SPREAD = 0V 100 kHz RFREQ = 75kΩ, PLLIN/SPREAD = 0V 450 500 550 kHz RFREQ = 12.1kΩ, PLLIN/SPREAD = 0V 3 MHz Synchronizable Frequency Range PLLIN/SPREAD = External Clock l 0.1 3 MHz PLLIN Input High Level l 2.2 V PLLIN Input Low Level l 0.5 V Spread Spectrum Frequency Range PLLIN/SPREAD = INTVCC (Relative to fOSC) Minimum Frequency –12 % Maximum Frequency 15 %
PGOOD1 and PGOOD2 Outputs
PGOOD Voltage Low IPGOOD1,2 = 2mA 0.2 0.4 V PGOOD Leakage Current VPGOOD1,2 = 5V ±1 µA PGOOD Trip Level VFB Rising 7 10 13 % VFB Relative to Set Regulation Point Hysteresis 2.5 % VFB Falling –13 –10 –7 % Hysteresis 2.5 % PGOOD Delay for Reporting a Fault 25 µs Rev. 0 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 Typical Application Related Parts