Datasheet LTC3871, LTC3871-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Bidirectional PolyPhase Synchronous Buck or Boost Controller |
| Pages / Page | 36 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | B |
| File Format / Size | PDF / 1.6 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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Text Version of Document
LTC3871/LTC3871-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C, VHIGH = 50V, VRUN = 5V unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VHIGH VHIGH Supply Voltage Range 5 100 V VLOW VLOW Supply Voltage Range VHIGH > 5V 1.2 30 V VLOW Regulated Feedback Voltage (Note 4); ITHLOW Voltage = 1.5V l 1.188 1.200 1.212 V VHIGH Regulated Feedback Voltage (Note 4); ITHHIGH Voltage = 0.5V l 1.185 1.200 1.215 V VLOW EA Feedback Current (Note 4) –115 –200 nA VHIGH EA Feedback Current (Note 4) –115 –200 nA Reference Voltage Line Regulation (Note 4); VHIGH = 7V to 80V 0.02 0.2 % VLOW/VHIGH Voltage Load Regulation Measured in Servo Loop; 0.01 0.2 % ∆ITH Voltage = 1V to 1.5V Measured in Servo Loop; –0.01 –0.2 % ∆ITH Voltage = 1V to 0.5V gm-buck Transconductance Amplifier gm-buck (Note 4); ITHLOW = 1.5V; Sink/Source 5µA 2 mmho gm-boost Transconductance Amplifier gm-boost (Note 4); ITHHIGH= 0.5V; Sink/Source 5µA 1 mmho IQ VHIGH DC Supply Current (Note 5) 8 14 mA Shutdown (VHIGH) VRUN = 0V; VHIGH = 50V 140 µA Undervoltage Lockout V5 Ramping Down 3.7 4.15 4.5 V Undervoltage Hysteresis 0.5 V RUN Pin On Threshold VRUN Rising 1.1 1.22 1.35 V RUN Pin On Hysteresis 80 mV RUN Pin Source Current VRUN < 1.2 l 1 2 µA RUN Pin Source Current VRUN > 1.3 l 3 6.5 µA ISS Soft-Start Charging Current VSS = 1.2V 0.9 1.25 1.7 µA ISNSA+ 1,2 Current Sensing Pins Current 0.1 ±1 µA ISNSD+ 1,2 Current Sensing Pins Current 0.01 ±1 µA ISNS– 1,2 Current Sensing Pins Current 1.5 mA Total DC Sense Signal Gain DCR Configuration 5 V/V ILIM Pin Input Resistance 100 kΩ ISETCUR Current to Program Initial Current Limit l 6.75 7.5 8.25 µA IMON Current Proportional to VLOW at VILIM = Float; RSENSE = 3mΩ ±10 % Max Current IMON Zero Current Voltage l 1.125 1.25 1.375 V Sense Pin to IMON Gain VILIM = 0V, 1/4 VV5, Float 38 V/V VILIM = 3/4 VV5, VV5 19 V/V TG Pull-Up On-Resistance 5 Ω TG Pull-Down On-Resistance 2.5 Ω BG Driver Pull-Up On-Resistance 5 Ω BG Driver Pull-Down On-Resistance 2.5 Ω Total DC Sense Signal Gain RSENSE Configuration 4 V/V Maximum Duty Cycle Buck Mode 96 98 % Boost Mode 92 % Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions 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, VHIGH = 50V, VRUN = 5V unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VHIGH VHIGH Supply Voltage Range 5 100 V VLOW VLOW Supply Voltage Range VHIGH > 5V 1.2 30 V VLOW Regulated Feedback Voltage (Note 4); ITHLOW Voltage = 1.5V l 1.188 1.200 1.212 V VHIGH Regulated Feedback Voltage (Note 4); ITHHIGH Voltage = 0.5V l 1.185 1.200 1.215 V VLOW EA Feedback Current (Note 4) –115 –200 nA VHIGH EA Feedback Current (Note 4) –115 –200 nA Reference Voltage Line Regulation (Note 4); VHIGH = 7V to 80V 0.02 0.2 % VLOW/VHIGH Voltage Load Regulation Measured in Servo Loop; 0.01 0.2 % ∆ITH Voltage = 1V to 1.5V Measured in Servo Loop; –0.01 –0.2 % ∆ITH Voltage = 1V to 0.5V gm-buck Transconductance Amplifier gm-buck (Note 4); ITHLOW = 1.5V; Sink/Source 5µA 2 mmho gm-boost Transconductance Amplifier gm-boost (Note 4); ITHHIGH= 0.5V; Sink/Source 5µA 1 mmho IQ VHIGH DC Supply Current (Note 5) 8 14 mA Shutdown (VHIGH) VRUN = 0V; VHIGH = 50V 140 µA Undervoltage Lockout V5 Ramping Down 3.7 4.15 4.5 V Undervoltage Hysteresis 0.5 V RUN Pin On Threshold VRUN Rising 1.1 1.22 1.35 V RUN Pin On Hysteresis 80 mV RUN Pin Source Current VRUN < 1.2 l 1 2 µA RUN Pin Source Current VRUN > 1.3 l 3 6.5 µA ISS Soft-Start Charging Current VSS = 1.2V 0.9 1.25 1.7 µA ISNSA+ 1,2 Current Sensing Pins Current 0.1 ±1 µA ISNSD+ 1,2 Current Sensing Pins Current 0.01 ±1 µA ISNS– 1,2 Current Sensing Pins Current 1.5 mA Total DC Sense Signal Gain DCR Configuration 5 V/V ILIM Pin Input Resistance 100 kΩ ISETCUR Current to Program Initial Current Limit l 6.75 7.5 8.25 µA IMON Current Proportional to VLOW at VILIM = Float; RSENSE = 3mΩ ±10 % Max Current IMON Zero Current Voltage l 1.125 1.25 1.375 V Sense Pin to IMON Gain VILIM = 0V, 1/4 VV5, Float 38 V/V VILIM = 3/4 VV5, VV5 19 V/V TG Pull-Up On-Resistance 5 Ω TG Pull-Down On-Resistance 2.5 Ω BG Driver Pull-Up On-Resistance 5 Ω BG Driver Pull-Down On-Resistance 2.5 Ω Total DC Sense Signal Gain RSENSE Configuration 4 V/V Maximum Duty Cycle Buck Mode 96 98 % Boost Mode 92 % Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
