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LT8705 Datasheet(PDF) 3 Page - Linear Technology |
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LT8705 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 42 page  LTC7813 3 7813f For more information www.linear.com/LTC7813 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 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG2 = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VBIAS Bias Input Supply Operating Voltage Range 4.5 60 V VOUT1 Buck Regulated Output Voltage Set Point 0.8 60 V VOUT2 Boost Regulated Output Voltage Set Point 60 V VSENSE2(CM) SENSE2 Pins Common Mode Range (BOOST Converter Input Supply Voltage) 2.2 60 V VFB1 Buck Regulated Feedback Voltage (Note 4) ITH1 Voltage = 1.2V 0°C to 85°C l 0.792 0.788 0.800 0.800 0.808 0.812 V V VFB2 Boost Regulated Feedback Voltage (Note 4) ITH2 Voltage = 1.2V VPRG2 = 0V VPRG2 = FLOAT VPRG2 = INTVCC l l l 1.182 9.78 11.74 1.200 10.00 12.00 1.218 10.22 12.26 V V V IFB1 Buck Feedback Current (Note 4) –2 ±50 nA IFB2 Boost Feedback Current (Note 4) VPRG2 = 0V VPRG2 = FLOAT VPRG2 = INTVCC ±0.01 4 5 ±0.05 6 7 µA µA µA Reference Voltage Line Regulation (Note 4) VBIAS = 4.5V to 60V 0.002 0.02 %/V Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 2V l –0.01 –0.1 % gm1,2 Transconductance Amplifier gm (Note 4) ITH1,2 = 1.2V, Sink/Source 5µA 2 mmho IQ Input DC Supply Current (Note 5), VDRVSET = 0V Pulse-Skipping or Forced Continuous Mode (One Channel On) RUN1 = 5V and RUN2 = 0V or RUN2 = 5V and RUN1 = 0V VFB1 = 0.83V (No Load), VFB2 = 1.25V (No Load) 1.6 0.8 mA mA Pulse-Skipping or Forced Continuous Mode (Both Channels On) RUN1,2 = 5V, VFB1 = 0.83V (No Load), VFB2 = 1.25V (No Load) 2.2 mA Sleep Mode (One Channel On, Buck) RUN1 = 5V and RUN2 = 0V VFB1 = 0.83V (No Load) l 29 55 µA Sleep Mode (One Channel On, Boost) RUN2 = 5V and RUN1 = 0V, VFB2 = 1.25V (No Load) 29 50 µA Sleep Mode (Both Channels On) RUN1 = 5V and RUN2 = 5V, VFB1 = 0.83V (No Load), VFB2 = 1.25V (No Load) 34 55 µA Shutdown RUN1,2 = 0V 3.6 10 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V DRVUV = INTVCC l l 4.0 7.5 4.2 7.8 V V DRVCC Ramping Down DRVUV = 0V DRVUV = INTVCC l l 3.6 6.4 3.8 6.7 4.0 7.0 V V Buck Feedback Overvoltage Protection Measured at VFB1 Relative to Regulated VFB1 7 10 13 % SENSE1+ Pin Current ±1 µA SENSE2+ Pin Current 170 µA SENSE1– Pin Current VSENSE1– < VINTVCC – 0.5V VSENSE1– > VINTVCC + 0.5V 700 ±1 µA µA SENSE2– Pin Current VSENSE2+, VSENSE2– = 12V ±1 µA |
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