Datasheet LTC3874 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing |
| 页数 / 页 | 30 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 919 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3874
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, VRUN0,1 = 3.3V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range LOWDCR = INTVCC (Note 3) 3.5 V LOWDCR = 0V 5.5 V IQ Input DC Supply Current (Note 4) Normal Operation VRUN0,1 = 3.3V 4.6 mA Shutdown VRUN0,1 = 0V 1.8 mA VUVLO Undervoltage Lockout Threshold VINTVCC Falling 3.5 V VINTVCC Rising 3.8 V
Control Loop
IISENSE0,1 ISENSE Pins Bias Current VISENSE0,1 < (VINTVCC – 3.3V) l ±0.15 ±0.4 µA VISENSE0,1 > (VINTVCC – 3.3V) l ±1 ±3 µA VISENSE(MAX) Maximum Current Sense Threshold (Table 3) ILIM = INTVCC, LOWDCR = INTVCC, l 26.8 28.8 30.8 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = 0V, LOWDCR = INTVCC, l 14.5 16 17.5 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = INTVCC, LOWDCR = 0V, l 65 72 79 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = 0V, LOWDCR = 0V, l 33 40 47 mV VISENSE0,1 = 1.2V, VITH = 2.18V
Gate Drivers
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω TG0,1 TG Transition Time: (Note 5) tr Rise Time CLOAD = 3300pF 30 ns tf Fall Time CLOAD = 3300pF 30 ns BG0,1 BG Transition Time: (Note 5) tr Rise Time CLOAD = 3300pF 30 ns tf Fall Time CLOAD = 3300pF 30 ns TG/BG t1D Top Gate Off to Bottom Gate on Delay Time CLOAD = 3300pF Each Driver (Note 5) 30 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Time CLOAD = 3300pF Each Driver (Note 5) 30 ns tON(MIN) Minimum On-Time (Note 6) 60 ns
INTVCC Regulator
VINTVCC Internal VCC Voltage No Load 6V < VIN < 38V 5.25 5.5 5.75 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive (Note 7) l 4.5 4.7 V VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 100 mV VLDOHYS EXTVCC Hysteresis 300 mV 3874fb For more information www.linear.com/LTC3874 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information 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, VRUN0,1 = 3.3V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range LOWDCR = INTVCC (Note 3) 3.5 V LOWDCR = 0V 5.5 V IQ Input DC Supply Current (Note 4) Normal Operation VRUN0,1 = 3.3V 4.6 mA Shutdown VRUN0,1 = 0V 1.8 mA VUVLO Undervoltage Lockout Threshold VINTVCC Falling 3.5 V VINTVCC Rising 3.8 V
Control Loop
IISENSE0,1 ISENSE Pins Bias Current VISENSE0,1 < (VINTVCC – 3.3V) l ±0.15 ±0.4 µA VISENSE0,1 > (VINTVCC – 3.3V) l ±1 ±3 µA VISENSE(MAX) Maximum Current Sense Threshold (Table 3) ILIM = INTVCC, LOWDCR = INTVCC, l 26.8 28.8 30.8 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = 0V, LOWDCR = INTVCC, l 14.5 16 17.5 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = INTVCC, LOWDCR = 0V, l 65 72 79 mV VISENSE0,1 = 1.2V, VITH = 2.18V ILIM = 0V, LOWDCR = 0V, l 33 40 47 mV VISENSE0,1 = 1.2V, VITH = 2.18V
Gate Drivers
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω TG0,1 TG Transition Time: (Note 5) tr Rise Time CLOAD = 3300pF 30 ns tf Fall Time CLOAD = 3300pF 30 ns BG0,1 BG Transition Time: (Note 5) tr Rise Time CLOAD = 3300pF 30 ns tf Fall Time CLOAD = 3300pF 30 ns TG/BG t1D Top Gate Off to Bottom Gate on Delay Time CLOAD = 3300pF Each Driver (Note 5) 30 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Time CLOAD = 3300pF Each Driver (Note 5) 30 ns tON(MIN) Minimum On-Time (Note 6) 60 ns
INTVCC Regulator
VINTVCC Internal VCC Voltage No Load 6V < VIN < 38V 5.25 5.5 5.75 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive (Note 7) l 4.5 4.7 V VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 100 mV VLDOHYS EXTVCC Hysteresis 300 mV 3874fb For more information www.linear.com/LTC3874 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts