Datasheet LTC3835-1 (Analog Devices) - 3

LTC3835-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V l 0.792 0.800 0.808 V IVFB Feedback Current (Note 4) –5 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4V to 30V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V l 0.1 0.5 % Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V l –0.1 –0.5 % gm Transconductance Amplifi er gm ITH = 1.2V; Sink/Source 5μA (Note 4) 1.55 mmho IQ Input DC Supply Current (Note 5) Sleep Mode RUN = 5V, VFB = 0.83V (No Load) 80 125 μA Shutdown VRUN = 0V 10 20 μA UVLO Undervoltage Lockout VIN Ramping Down l 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VFB Relative to Regulated VFB 8 10 12 % I – + SENSE Sense Pins Total Source Current VSENSE = VSENSE = 0V –660 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 0.75 1.0 1.35 μA VRUN ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V V – SENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V 90 100 110 mV V – FB = 0.7V, VSENSE = 3.3V l 80 100 115 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) 180 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
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LTC3835E-1 is guaranteed to meet performance specifi cations may cause permanent damage to the device. Exposure to any Absolute from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device temperature range are assured by design, characterization and correlation reliability and lifetime. with statistical process controls. The LTC3835I-1 is guaranteed to meet performance specifi catons over the full –40°C to 85°C operating temperature range. 38351fc 3