Datasheet LTC3899 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | 60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller with PassThru |
| Páginas / Página | 38 / 4 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 937 Kb |
| Idioma del documento | Inglés |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the specified operating
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LTC3899
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) VBIAS = 12V, VRUN1,2,3 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG3 = Float unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IQ Input DC Supply Current (Note 5), VDRVSET = 0V Pulse-Skipping or Forced Continuous Mode RUN1 = 5V and RUN2,3 = 0V or 1.6 mA (One Channel On) RUN2 = 5V and RUN1,3 = 0V or 1.6 RUN3 = 5V and RUN1,2 = 0V, 0.8 VFB1,2 = 0.83V (No Load), VFB3 = 1.25V Pulse-Skipping or Forced Continuous Mode RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), 3 mA (All Channels On) VFB3 = 1.25V Sleep Mode (One Channel On, Buck) RUN1 = 5V and RUN2,3 = 0V or l 29 55 µA RUN2 = 5V and RUN1,3 = 0V VFB1,2 = 0.83V (No Load) Sleep Mode (One Channel On, Boost) RUN3 = 5V and RUN1,2 = 0V, VFB3 = 1.25V 29 50 µA Sleep Mode (Buck and Boost Channel On) RUN1 = 5V and RUN2 = 0V or 34 55 µA RUN2 = 5V and RUN1 = 0V, RUN3 = 5V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V Sleep Mode (All Three Channels On) RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), 39 60 µA VFB3 = 1.25V Shutdown RUN1,2,3 = 0V 3.6 10 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVSET = 0V or RDRVSET ≤ 100kΩ l 4.0 4.2 V DRVSET = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVSET = 0V or RDRVSET ≤ 100kΩ l 3.6 3.8 4.0 V DRVSET = INTVCC l 6.4 6.7 7.0 V VOVL1,2 Buck Feedback Overvoltage Protection Measured at VFB1,2 Relative to Regulated VFB1,2 7 10 13 % ISENSE1,2+ SENSE+ Pin Current Bucks (Channels 1 and 2) ±1 µA ISENSE3+ SENSE+ Pin Current Boost (Channel 3) 170 µA ISENSE1,2– SENSE– Pins Current Bucks (Channels 1 and 2) VOUT1,2 < VINTVCC – 0.5V ±1 µA VOUT1,2 > VINTVCC + 0.5V 700 µA ISENSE3– SENSE– Pin Current Boost (Channel 3) VSENSE+, VSENSE– = 12V ±1 µA DFMAX(TG) Maximum Duty Factor for TG Bucks (Channels 1,2) in Dropout, FREQ = 0V 97.5 99 % Boost (Channel 3) in Overvoltage 100 % DFMAX(BG) Maximum Duty Factor for BG Bucks (Channels 1,2) in Overvoltage 100 % Boost (Channel 3) 96 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK/SS1,2 = 0V 8 10 12 µA ISS Soft-Start Charge Current VSS3 = 0V 8 10 12 µA VRUN1,2,3 ON RUN Pin On Threshold VRUN1, VRUN2, VRUN3 Rising l 1.22 1.275 1.33 V VRUN1,2,3 Hyst RUN Pin Hysteresis 75 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1,2– = 3.3V, l 65 75 85 mV VFB3 = 1.1V, VSENSE3+ = 12V VSENSE(CM) SENSE3 Pins Common Mode Range 2.2 60 V (BOOST Converter Input Supply Voltage)
Gate Driver
TG1,2,3 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω BG1,2,3 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω 3899fa 4 For more information www.linear.com/LTC3899 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagrams Operation Typical Applications Package Description 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) VBIAS = 12V, VRUN1,2,3 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG3 = Float unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IQ Input DC Supply Current (Note 5), VDRVSET = 0V Pulse-Skipping or Forced Continuous Mode RUN1 = 5V and RUN2,3 = 0V or 1.6 mA (One Channel On) RUN2 = 5V and RUN1,3 = 0V or 1.6 RUN3 = 5V and RUN1,2 = 0V, 0.8 VFB1,2 = 0.83V (No Load), VFB3 = 1.25V Pulse-Skipping or Forced Continuous Mode RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), 3 mA (All Channels On) VFB3 = 1.25V Sleep Mode (One Channel On, Buck) RUN1 = 5V and RUN2,3 = 0V or l 29 55 µA RUN2 = 5V and RUN1,3 = 0V VFB1,2 = 0.83V (No Load) Sleep Mode (One Channel On, Boost) RUN3 = 5V and RUN1,2 = 0V, VFB3 = 1.25V 29 50 µA Sleep Mode (Buck and Boost Channel On) RUN1 = 5V and RUN2 = 0V or 34 55 µA RUN2 = 5V and RUN1 = 0V, RUN3 = 5V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V Sleep Mode (All Three Channels On) RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), 39 60 µA VFB3 = 1.25V Shutdown RUN1,2,3 = 0V 3.6 10 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVSET = 0V or RDRVSET ≤ 100kΩ l 4.0 4.2 V DRVSET = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVSET = 0V or RDRVSET ≤ 100kΩ l 3.6 3.8 4.0 V DRVSET = INTVCC l 6.4 6.7 7.0 V VOVL1,2 Buck Feedback Overvoltage Protection Measured at VFB1,2 Relative to Regulated VFB1,2 7 10 13 % ISENSE1,2+ SENSE+ Pin Current Bucks (Channels 1 and 2) ±1 µA ISENSE3+ SENSE+ Pin Current Boost (Channel 3) 170 µA ISENSE1,2– SENSE– Pins Current Bucks (Channels 1 and 2) VOUT1,2 < VINTVCC – 0.5V ±1 µA VOUT1,2 > VINTVCC + 0.5V 700 µA ISENSE3– SENSE– Pin Current Boost (Channel 3) VSENSE+, VSENSE– = 12V ±1 µA DFMAX(TG) Maximum Duty Factor for TG Bucks (Channels 1,2) in Dropout, FREQ = 0V 97.5 99 % Boost (Channel 3) in Overvoltage 100 % DFMAX(BG) Maximum Duty Factor for BG Bucks (Channels 1,2) in Overvoltage 100 % Boost (Channel 3) 96 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK/SS1,2 = 0V 8 10 12 µA ISS Soft-Start Charge Current VSS3 = 0V 8 10 12 µA VRUN1,2,3 ON RUN Pin On Threshold VRUN1, VRUN2, VRUN3 Rising l 1.22 1.275 1.33 V VRUN1,2,3 Hyst RUN Pin Hysteresis 75 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1,2– = 3.3V, l 65 75 85 mV VFB3 = 1.1V, VSENSE3+ = 12V VSENSE(CM) SENSE3 Pins Common Mode Range 2.2 60 V (BOOST Converter Input Supply Voltage)
Gate Driver
TG1,2,3 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω BG1,2,3 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω 3899fa 4 For more information www.linear.com/LTC3899 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagrams Operation Typical Applications Package Description Typical Application Related Parts