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LTC3834EGN-1-TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3834EGN-1-TRPBF Datasheet(HTML) 3 Page - Linear Technology |
3 / 28 page 3 LTC3834-1 38341f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; I TH Voltage = 1.2V to 0.7V ● 0.1 0.5 % Measured in Servo Loop; I TH Voltage = 1.2V to 2V ● – 0.1 – 0.5 % gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5μA (Note 4) 0.5 mmho IQ Input DC Supply Current (Note 5) Sleep Mode RUN = 5V, VFB = 0.83V (No Load) 30 50 μA Shutdown VRUN = 0V 4 10 μA UVLO Undervoltage Lockout VIN Ramping Down ● 3.7 4 V VOVL Feedback Overvoltage Lockout Measured at VFB Relative to Regulated VFB 810 12 % ISENSE Sense Pins Total Source Current VSENSE– = VSENSE+ = 0V –220 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 0.85 1.1 1.45 μA VRUN ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V ● 85 100 115 mV TG Transition Time: (Note 6) TG1, 2 tr Rise Time CLOAD = 3300pF 50 90 ns TG1, 2 tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 6) BG1, 2 tr Rise Time CLOAD = 3300pF 40 90 ns BG1, 2 tf Fall Time CLOAD = 3300pF 40 80 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF 70 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF 70 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 200 ns INTVCC Linear Regulator VINTVCCVIN Internal VCC Voltage 8.5V < VIN < 30V 5.0 5.25 5.5 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA 0.2 1.0 % Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLLPF = No Connect 360 400 440 kHz fLOW Lowest Frequency VPLLLPF = 0V 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC 475 530 580 kHz fSYNCMIN Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V 115 140 kHz fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN/MODE < fOSC –5 μA Sourcing Capability fPLLIN/MODE > fOSC 5 μA The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted. ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3834E-1 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3834I-1 is guaranteed to meet performance specifications over the –40°C to 85°C operating temperature range. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3834GN-1: TJ = TA + (PD • 90°C/W) LTC3834DHC-1: TJ = TA + (PD • 43.5°C/W) Note 4: The LTC3834-1 is tested in a feedback loop that servos VITH to a specified voltage and measures the resultant VFB. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 6: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 7: The minimum on-time condition is specified for an inductor peak-to-peak ripple current 40% of IMAX (see Minimum On-Time Considerations in the Applications Information section). |
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