Datasheet LTC3729L-6 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | PolyPhase, Synchronous Step-Down Switching Regulator |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 356 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LTC3729L-6
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; ITH Voltage = 0.7V ● 0.1 0.5 % Measured in Servo Loop; ITH Voltage = 2V ● – 0.1 – 0.5 % VREFLNREG Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 3) 0.002 0.02 %/V VOVL Output Overvoltage Threshold Measured at VEAIN ● 0.64 0.66 0.68 V UVLO Undervoltage Lockout VIN Ramping Down 3 3.5 4 V gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5µA; (Note 3) 3 mmho gmOL Transconductance Amplifier Gain ITH = 1.2V; (gmxZL; No Ext Load); (Note 3) 1.5 V/mV IQ Input DC Supply Current (Note 4) Normal Mode EXTVCC Tied to VOUT; VOUT = 5V 470 µA Shutdown VRUN/SS = 0V 20 40 µA IRUN/SS Soft-Start Charge Current VRUN/SS = 1.9V – 0.5 – 1.2 µA VRUN/SS RUN/SS Pin ON Threshold VRUN/SS Rising 1.0 1.5 2.0 V VRUN/SSLO RUN/SS Pin Latchoff Arming VRUN/SS Rising from 3V 4.1 4.75 V ISCL RUN/SS Discharge Current Soft Short Condition VEAIN = 0.375V; VRUN/SS = 4.5V 0.5 2 4 µA ISDLDO Shutdown Latch Disable Current VEAIN = 0.4V 1.6 5 µA ISENSE Total Sense Pins Source Current Each Channel; VSENSE1–, 2– = VSENSE1+, 2+ = 0V – 85 – 60 µA DFMAX Maximum Duty Factor In Dropout; VSENSEMAX ≤ 30mV 98 99.5 % Top Gate Transition Time: TG1, 2 tr Rise Time CLOAD = 3300pF 55 100 ns TG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns Bottom Gate Transition Time: BG1, 2 tr Rise Time CLOAD = 3300pF 45 100 ns BG1, 2 tf Fall Time CLOAD = 3300pF 45 90 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns tON(MIN) Minimum On-Time Tested with a Square Wave (Note 5) 100 ns
Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V; VEXTVCC = 4V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA; VEXTVCC = 4V 0.2 2.0 % VLDO EXT EXTVCC Voltage Drop ICC = 20mA; VEXTVCC = 5V 100 200 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive ● 4.5 4.7 V VLDOHYS EXTVCC Switchover Hysteresis ICC = 20mA, EXTVCC Ramping Negative 0.2 V
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 620 kHz RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC – 15 µA Sourcing Capability fPLLIN > fOSC 15 µA sn3729l6 3729l6fs 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; ITH Voltage = 0.7V ● 0.1 0.5 % Measured in Servo Loop; ITH Voltage = 2V ● – 0.1 – 0.5 % VREFLNREG Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 3) 0.002 0.02 %/V VOVL Output Overvoltage Threshold Measured at VEAIN ● 0.64 0.66 0.68 V UVLO Undervoltage Lockout VIN Ramping Down 3 3.5 4 V gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5µA; (Note 3) 3 mmho gmOL Transconductance Amplifier Gain ITH = 1.2V; (gmxZL; No Ext Load); (Note 3) 1.5 V/mV IQ Input DC Supply Current (Note 4) Normal Mode EXTVCC Tied to VOUT; VOUT = 5V 470 µA Shutdown VRUN/SS = 0V 20 40 µA IRUN/SS Soft-Start Charge Current VRUN/SS = 1.9V – 0.5 – 1.2 µA VRUN/SS RUN/SS Pin ON Threshold VRUN/SS Rising 1.0 1.5 2.0 V VRUN/SSLO RUN/SS Pin Latchoff Arming VRUN/SS Rising from 3V 4.1 4.75 V ISCL RUN/SS Discharge Current Soft Short Condition VEAIN = 0.375V; VRUN/SS = 4.5V 0.5 2 4 µA ISDLDO Shutdown Latch Disable Current VEAIN = 0.4V 1.6 5 µA ISENSE Total Sense Pins Source Current Each Channel; VSENSE1–, 2– = VSENSE1+, 2+ = 0V – 85 – 60 µA DFMAX Maximum Duty Factor In Dropout; VSENSEMAX ≤ 30mV 98 99.5 % Top Gate Transition Time: TG1, 2 tr Rise Time CLOAD = 3300pF 55 100 ns TG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns Bottom Gate Transition Time: BG1, 2 tr Rise Time CLOAD = 3300pF 45 100 ns BG1, 2 tf Fall Time CLOAD = 3300pF 45 90 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns tON(MIN) Minimum On-Time Tested with a Square Wave (Note 5) 100 ns
Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V; VEXTVCC = 4V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA; VEXTVCC = 4V 0.2 2.0 % VLDO EXT EXTVCC Voltage Drop ICC = 20mA; VEXTVCC = 5V 100 200 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive ● 4.5 4.7 V VLDOHYS EXTVCC Switchover Hysteresis ICC = 20mA, EXTVCC Ramping Negative 0.2 V
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 620 kHz RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC – 15 µA Sourcing Capability fPLLIN > fOSC 15 µA sn3729l6 3729l6fs 3
