Datasheet LTC3875 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation |
| Pages / Page | 46 / 4 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 997 Kb |
| Document Language | English |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
Text Version of Document
LTC3875
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 = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX)(DC) Maximum Current Sense Threshold 0°C to 85°C with SNSD+ Pin to V – OUT VSNS (s) = 1.2V, ILIM = 0V 9 10 11 mV V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC 14 15 16 mV – VSNS (s) = 1.2V, ILIM = 1/2 INTVCC 19 20 21 mV – VSNS (s) = 1.2V, ILIM = 3/4 INTVCC 23.5 25 26.5 mV – VSNS (s) = 1.2V, ILIM = INTVCC 28.5 30 31.5 mV –40°C to 125°C V – SNS (s) = 1.2V, ILIM = 0V l 8.5 10 11.5 mV V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC l 13.5 15 16.5 mV – VSNS (s) = 1.2V, ILIM = 1/2 INTVCC l 17.5 20 22.5 mV – VSNS (s) = 1.2V, ILIM = 3/4 INTVCC l 22 25 28 mV – VSNS (s) = 1.2V, ILIM = INTVCC l 26.5 30 33.5 mV V – SENSE(MAX)(NODE) Maximum Current Sense Threshold VSNS (s) = 1.2V, ILIM = 0V l 45 50 55 mV with SNSD+ Pin to GND V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC l 70 75 80 mV V – SNS (s) = 1.2V, ILIM = 1/2 INTVCC l 95 100 105 mV V – SNS (s) = 1.2V, ILIM = 3/4 INTVCC l 117.5 125 132.5 mV V – SNS (s) = 1.2V, ILIM = INTVCC l 142.5 150 157.5 mV IMISMATCH Channel-to-Channel Current ILIM = Float, ENTMPB = Float 5 % Mismatch (Thermal Balance Disabled) IQ Input DC Supply Current (Note 5) Normal Mode VIN = 15V (without EXTVCC Enabled) 7 10 mA Shutdown VRUN1,2 = 0V 40 60 µA UVLO Undervoltage Lockout VINTVCC Ramping Down 3.5 3.7 4.0 V UVLO Hyst UVLO Hysteresis 0.5 V V + OVL Feedback Overvoltage Lockout Measured at VOSNS1,2 l 0.625 0.645 0.665 V ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V l 1.0 1.25 1.5 µA VRUN1,2 RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2HYS RUN Pin On Hysteresis 80 mV
Driver Functions
TG Transition Time (Note 6) TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Note 6) BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On CLOAD = 3300pF Each Driver 30 ns Delay Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On CLOAD = 3300pF Each Driver 30 ns Delay Synchronous Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 90 ns 3875fb 4 For more information www.linear.com/LTC3875 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications 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 = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX)(DC) Maximum Current Sense Threshold 0°C to 85°C with SNSD+ Pin to V – OUT VSNS (s) = 1.2V, ILIM = 0V 9 10 11 mV V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC 14 15 16 mV – VSNS (s) = 1.2V, ILIM = 1/2 INTVCC 19 20 21 mV – VSNS (s) = 1.2V, ILIM = 3/4 INTVCC 23.5 25 26.5 mV – VSNS (s) = 1.2V, ILIM = INTVCC 28.5 30 31.5 mV –40°C to 125°C V – SNS (s) = 1.2V, ILIM = 0V l 8.5 10 11.5 mV V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC l 13.5 15 16.5 mV – VSNS (s) = 1.2V, ILIM = 1/2 INTVCC l 17.5 20 22.5 mV – VSNS (s) = 1.2V, ILIM = 3/4 INTVCC l 22 25 28 mV – VSNS (s) = 1.2V, ILIM = INTVCC l 26.5 30 33.5 mV V – SENSE(MAX)(NODE) Maximum Current Sense Threshold VSNS (s) = 1.2V, ILIM = 0V l 45 50 55 mV with SNSD+ Pin to GND V – SNS (s) = 1.2V, ILIM = 1/4 INTVCC l 70 75 80 mV V – SNS (s) = 1.2V, ILIM = 1/2 INTVCC l 95 100 105 mV V – SNS (s) = 1.2V, ILIM = 3/4 INTVCC l 117.5 125 132.5 mV V – SNS (s) = 1.2V, ILIM = INTVCC l 142.5 150 157.5 mV IMISMATCH Channel-to-Channel Current ILIM = Float, ENTMPB = Float 5 % Mismatch (Thermal Balance Disabled) IQ Input DC Supply Current (Note 5) Normal Mode VIN = 15V (without EXTVCC Enabled) 7 10 mA Shutdown VRUN1,2 = 0V 40 60 µA UVLO Undervoltage Lockout VINTVCC Ramping Down 3.5 3.7 4.0 V UVLO Hyst UVLO Hysteresis 0.5 V V + OVL Feedback Overvoltage Lockout Measured at VOSNS1,2 l 0.625 0.645 0.665 V ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V l 1.0 1.25 1.5 µA VRUN1,2 RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2HYS RUN Pin On Hysteresis 80 mV
Driver Functions
TG Transition Time (Note 6) TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Note 6) BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On CLOAD = 3300pF Each Driver 30 ns Delay Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On CLOAD = 3300pF Each Driver 30 ns Delay Synchronous Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 90 ns 3875fb 4 For more information www.linear.com/LTC3875 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Related Parts
