Datasheet LTC3851A-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Synchronous Step-Down Switching Regulator Controller |
| Pages / Page | 30 / 3 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| File Format / Size | PDF / 442 Kb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
- LTC3851AEMSE-1#PBF LTC3851AEMSE-1#PBF LTC3851AEMSE-1#TRPBF LTC3851AEMSE-1#TRPBF LTC3851AEUD-1#PBF LTC3851AEUD-1#PBF LTC3851AEUD-1#TRPBF LTC3851AEUD-1#TRPBF LTC3851AHMSE-1#PBF LTC3851AHMSE-1#PBF LTC3851AHMSE-1#TRPBF LTC3851AHMSE-1#TRPBF LTC3851AIMSE-1#PBF LTC3851AIMSE-1#PBF LTC3851AIMSE-1#TRPBF LTC3851AIMSE-1#TRPBF LTC3851AIUD-1#PBF LTC3851AIUD-1#PBF LTC3851AIUD-1#TRPBF LTC3851AIUD-1#TRPBF LTC3851AMPMSE-1#PBF LTC3851AMPMSE-1#PBF LTC3851AMPMSE-1#TRPBF LTC3851AMPMSE-1#TRPBF
Text Version of Document
LTC3851A-1
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, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Operating Voltage Range 4 38 V VFB Regulated Feedback Voltage ITH = 1.2V (Note 4) 0°C to 85°C l 0.792 0.800 0.808 V ITH = 1.2V (Note 4) –40°C to 125°C l 0.788 0.812 V ITH = 1.2V (Note 4) –40°C to 150°C l 0.788 0.812 V ITH = 1.2V (Note 4) –55°C to 150°C l 0.788 0.812 V IFB Feedback Current (Note 4) –10 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 6V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V (H-Grade, MP-Grade) l 0.2 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V l –0.01 –0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V (H-Grade, MP-Grade) l –0.2 % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source = 5µA (Note 4) 2 mmho gm GBW Transconductance Amp Gain Bandwidth ITH = 1.2V (Note 8) 3 MHz IQ Input DC Supply Current (Note 5) Normal Mode VRUN = 5V 1 mA Shutdown VRUN = 0V 25 50 µA UVLO Undervoltage Lockout on INTVCC VINTVCC Ramping Down 3.25 V UVLO Hys UVLO Hysteresis 0.4 V ISENSE SENSE Pins Current ±1 ±2 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V 0.6 1 2 µA VRUN RUN Pin On—Threshold VRUN Rising l 1.10 1.22 1.35 V VRUNHYS RUN Pin On—Hysteresis 120 mV VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V l 40 53 65 mV VFB = 0.7V, VSENSE = 3.3V (H-Grade, MP-Grade) l 35 70 mV TG RUP TG Driver Pull-Up On-Resistance TG High 2.2 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.2 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 2.1 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low 1.1 Ω TG Transition Time (Note 6) TG tr Rise Time CLOAD = 3300pF 25 ns TG tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Note 6) BG tr Rise Time CLOAD = 3300pF 25 ns BG tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 30 ns Bottom Switch-On Delay Time (Note 6) BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 30 ns Top Switch-On Delay Time (Note 6) tON(MIN) Minimum On-Time (Note 7) 90 ns
INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 38V 4.8 5 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 50mA 0.5 % 3851a1fa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications 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 (Note 2). VIN = 15V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Operating Voltage Range 4 38 V VFB Regulated Feedback Voltage ITH = 1.2V (Note 4) 0°C to 85°C l 0.792 0.800 0.808 V ITH = 1.2V (Note 4) –40°C to 125°C l 0.788 0.812 V ITH = 1.2V (Note 4) –40°C to 150°C l 0.788 0.812 V ITH = 1.2V (Note 4) –55°C to 150°C l 0.788 0.812 V IFB Feedback Current (Note 4) –10 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 6V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V (H-Grade, MP-Grade) l 0.2 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V l –0.01 –0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V (H-Grade, MP-Grade) l –0.2 % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source = 5µA (Note 4) 2 mmho gm GBW Transconductance Amp Gain Bandwidth ITH = 1.2V (Note 8) 3 MHz IQ Input DC Supply Current (Note 5) Normal Mode VRUN = 5V 1 mA Shutdown VRUN = 0V 25 50 µA UVLO Undervoltage Lockout on INTVCC VINTVCC Ramping Down 3.25 V UVLO Hys UVLO Hysteresis 0.4 V ISENSE SENSE Pins Current ±1 ±2 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V 0.6 1 2 µA VRUN RUN Pin On—Threshold VRUN Rising l 1.10 1.22 1.35 V VRUNHYS RUN Pin On—Hysteresis 120 mV VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V l 40 53 65 mV VFB = 0.7V, VSENSE = 3.3V (H-Grade, MP-Grade) l 35 70 mV TG RUP TG Driver Pull-Up On-Resistance TG High 2.2 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.2 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 2.1 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low 1.1 Ω TG Transition Time (Note 6) TG tr Rise Time CLOAD = 3300pF 25 ns TG tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Note 6) BG tr Rise Time CLOAD = 3300pF 25 ns BG tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 30 ns Bottom Switch-On Delay Time (Note 6) BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 30 ns Top Switch-On Delay Time (Note 6) tON(MIN) Minimum On-Time (Note 7) 90 ns
INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 38V 4.8 5 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 50mA 0.5 % 3851a1fa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
