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LTC1707 Datasheet(PDF) 2 Page - Linear Technology |
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LTC1707 Datasheet(HTML) 2 Page - Linear Technology |
2 / 16 page 2 LTC1707 ORDER PART NUMBER S8 PART MARKING Consult factory for Military grade parts. 1707 1707I LTC1707CS8 LTC1707IS8 TJMAX = 125°C, θJA = 110°C/ W TOP VIEW VREF SYNC/MODE VIN SW ITH RUN/SS VFB GND S8 PACKAGE 8-LEAD PLASTIC SO 1 2 3 4 8 7 6 5 (Note 1) Input Supply Voltage ................................ – 0.3V to 10V ITH Voltage ................................................. –0.3V to 5V RUN/SS, VFB Voltages ............................... – 0.3V to VIN SYNC/MODE Voltage ................................. – 0.3V to VIN P-Channel Switch Source Current (DC) .............. 800mA N-Channel Switch Sink Current (DC) .................. 800mA Peak SW Sink and Source Current ......................... 1.5A Operating Ambient Temperature Range Commercial ............................................ 0 °C to 70°C Industrial ........................................... – 40 °C to 85°C Junction Temperature (Note 2) ............................. 125 °C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IVFB Feedback Current (Note 3) 6 60 nA VFB Regulated Feedback Voltage (Note 3) q 0.78 0.80 0.82 V ∆VOVL Output Overvoltage Lockout ∆VOVL = VOVL – VFB 20 60 110 mV ∆VFB Reference Voltage Line Regulation VIN = 3V to 8.5V (Note 3) 0.002 0.01 %/V VLOADREG Output Voltage Load Regulation ITH Sinking 2µA (Note 3) 0.5 0.8 % ITH Sourcing 2µA (Note 3) – 0.5 – 0.8 % IS Input DC Bias Current (Note 4) Pulse Skipping Mode VIN = 8.5V, VOUT = 3.3V, VSYNC/MODE = 0V 300 µA Burst Mode Operation VITH = 0V, VIN = 8.5V, VSYNC/MODE = Open 200 320 µA Shutdown VRUN/SS = 0V, 3V < VIN < 8.5V 11 35 µA Shutdown VRUN/SS = 0V, VIN < 3V 6 µA VRUN/SS Run/SS Threshold VRUN/SS Ramping Positive 0.4 0.7 1.0 V IRUN/SS Soft-Start Current Source VRUN/SS = 0V 1.2 2.25 3.3 µA ISYNC/MODE SYNC/MODE Pull-Up Current VSYNC/MODE = 0V 0.5 1.5 2.5 µA fOSC Oscillator Frequency VFB = 0.7V 315 350 385 kHz VFB = 0V 35 kHz VUVLO Undervoltage Lockout VIN Ramping Down from 3V (0°C to 70°C) 2.55 2.70 2.85 V VIN Ramping Up from 0V (0°C to 70°C) 2.60 2.80 3.00 V VIN Ramping Down from 3V (–40°C to 85°C) 2.45 2.70 2.85 V VIN Ramping Up from 0V (–40°C to 85°C) 2.50 2.80 3.00 V RPFET RDS(ON) of P-Channel FET ISW = –100mA 0.5 0.7 Ω RNFET RDS(ON) of N-Channel FET ISW = – 100mA 0.6 0.8 Ω IPK Peak Inductor Current VIN = 4V, ITH = 1.4V, Duty Cycle < 40% 0.70 0.915 1.10 A ILSW SW Leakage VRUN/SS = 0V ±10 ±1000 nA VREF Reference Output Voltage IREF = 0µA q 1.178 1.19 1.202 mV ∆VREF Reference Output Load Regulation 0V ≤ IREF ≤ 100µA q 2.3 15 mV Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 110°C/W) Note 3: The LTC1707 is tested in a feedback loop that servos VFB to the balance point for the error amplifier (VITH = 0.8V). Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise specified. ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS |
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