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LTC3859AL Datasheet(PDF) 4 Page - Linear Technology |
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LTC3859AL Datasheet(HTML) 4 Page - Linear Technology |
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4 / 38 page  LTC3899 4 3899fa For more information www.linear.com/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 (One Channel On) RUN1 = 5V and RUN2,3 = 0V or RUN2 = 5V and RUN1,3 = 0V or RUN3 = 5V and RUN1,2 = 0V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V 1.6 1.6 0.8 mA Pulse-Skipping or Forced Continuous Mode (All Channels On) RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V 3 mA Sleep Mode (One Channel On, Buck) RUN1 = 5V and RUN2,3 = 0V or RUN2 = 5V and RUN1,3 = 0V VFB1,2 = 0.83V (No Load) l 29 55 µA 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 RUN2 = 5V and RUN1 = 0V, RUN3 = 5V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V 34 55 µA Sleep Mode (All Three Channels On) RUN1,2,3 = 5V, VFB1,2 = 0.83V (No Load), VFB3 = 1.25V 39 60 µA Shutdown RUN1,2,3 = 0V 3.6 10 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVSET = 0V or RDRVSET ≤ 100kΩ DRVSET = INTVCC l l 4.0 7.5 4.2 7.8 V V DRVCC Ramping Down DRVSET = 0V or RDRVSET ≤ 100kΩ DRVSET = INTVCC l l 3.6 6.4 3.8 6.7 4.0 7.0 V 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 VOUT1,2 > VINTVCC + 0.5V 700 ±1 µA 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 Boost (Channel 3) in Overvoltage 97.5 99 100 % % DFMAX(BG) Maximum Duty Factor for BG Bucks (Channels 1,2) in Overvoltage Boost (Channel 3) 100 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, VFB3 = 1.1V, VSENSE3+ = 12V l 65 75 85 mV VSENSE(CM) SENSE3 Pins Common Mode Range (BOOST Converter Input Supply Voltage) 2.2 60 V Gate Driver TG1,2,3 Pull-Up On-Resistance Pull-Down On-Resistance VDRVSET = INTVCC 2.2 1.0 Ω Ω BG1,2,3 Pull-Up On-Resistance Pull-Down On-Resistance VDRVSET = INTVCC 2.2 1.0 Ω Ω |
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