Datasheet LTC3801, LTC3801B (Analog Devices) - 2

LTC3801/LTC3801B
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
ORDER PART Input Supply Voltage (VIN).. – 0.3V to 10V TOP VIEW NUMBER SENSE–, PGATE Voltages .. – 0.3V to (VIN + 0.3V) V ITH/RUN 1 6 PGATE FB, ITH/RUN Voltages ... – 0.3V to 2.4V LTC3801ES6 GND 2 5 V PGATE Peak Output Current (<10µs) .. 1A IN LTC3801BES6 VFB 3 4 SENSE– Operating Temperature Range (Note 2) .. – 40°C to 85°C S6 PART MARKING Junction Temperature (Note 3) .. 150°C S6 PACKAGE 6-LEAD PLASTIC TSOT-23 Storage Temperature Range ... – 65°C to 150°C LTACR TJMAX = 150°C, θJA = 230°C/W Lead Temperature (Soldering, 10 sec).. 300°C LTAHN Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 4.2V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range ● 2.4 9.8 V Input DC Supply Current Typicals at VIN = 4.2V (Note 4) Normal Operation 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 1.3V 195 300 µA SLEEP Mode 2.4V ≤ VIN ≤ 9.8V (LTC3801 Only) 16 30 µA Shutdown 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V (LTC3801) 6 15 µA 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V (LTC3801B) 8 17 µA UVLO VIN < UVLO Threshold 1 2 µA Undervoltage Lockout Threshold VIN Rising ● 1.8 2.3 V VIN Falling ● 1.7 2.2 V Start-Up Current Source VITH/RUN = 0V (LTC3801) 0.5 1 1.5 µA VITH/RUN = 0V (LTC3801B) 1.0 2 3.0 µA Shutdown Threshold (at ITH/RUN) VITH/RUN Rising ● 0.3 0.6 0.95 V Regulated Feedback Voltage 0°C ≤ TA ≤ 85°C (Note 5) 0.788 0.800 0.812 V –40°C ≤ TA ≤ 85°C (Note 5) ● 0.780 0.800 0.812 V Feedback Voltage Line Regulation 2.4V ≤ VIN ≤ 9.8V (Note 5) 0.05 mV/V Feedback Voltage Load Regulation ITH/RUN Sinking 5µA (Note 5) 2 mV/µA ITH/RUN Sourcing 5µA (Note 5) 2 mV/µA VFB Input Current (Note 5) 2 10 nA Overvoltage Protect Threshold Measured at VFB 0.850 0.880 0.910 V Overvoltage Protect Hysteresis 40 mV Oscillator Frequency Normal Operation VFB = 0.8V 500 550 650 kHz Output Short Circuit VFB = 0V 210 kHz Gate Drive Rise Time CLOAD = 3000pF 40 ns Gate Drive Fall Time CLOAD = 3000pF 40 ns Peak Current Sense Voltage Duty Cycle < 40% (Note 6) LTC3801 ● 109 117 125 mV LTC3801B ● 95 104 113 mV Peak Current Sense Voltage in Burst Mode Operation LTC3801 Only 26 mV Default Soft-Start Time 0.6 ms
Note 1:
Absolute Maximum Ratings are those values beyond which the life TJ = TA + (PD • θJA°C/W) of a device may be impaired.
Note 4:
Dynamic supply current is higher due to the gate charge being
Note 2:
The LTC3801ES6/LTC3801BES6 are guaranteed to meet specifica- delivered at the switching frequency. tions from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 5:
The LTC3801/LTC3801B are tested in a feedback loop that servos temperature range are assured by design, characterization and correlation VFB to the output of the error amplifier while maintaining ITH/RUN at the with statistical process controls. midpoint of the current limit range.
Note 3:
TJ is calculated from the ambient temperature TA and power
Note 6:
Peak current sense voltage is reduced dependent on duty cycle as dissipation PD according to the following formula: given in Figure 1. sn3801 3801fs 2