Datasheet LTC1707 (Analog Devices) - 2

LTC1707
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Supply Voltage .. – 0.3V to 10V ORDER PART TOP VIEW I NUMBER TH Voltage ... – 0.3V to 5V RUN/SS, V I 1 8 V FB Voltages ... – 0.3V to VIN TH REF LTC1707CS8 SYNC/MODE Voltage ... – 0.3V to V RUN/SS 2 7 SYNC/MODE IN LTC1707IS8 P-Channel Switch Source Current (DC) .. 800mA V 3 6 V FB IN N-Channel Switch Sink Current (DC) .. 800mA GND 4 5 SW S8 PART MARKING Peak SW Sink and Source Current ... 1.5A S8 PACKAGE Operating Ambient Temperature Range 8-LEAD PLASTIC SO 1707 TJMAX = 125°C, θJA = 120°C/ W Commercial .. 0°C to 70°C 1707I Industrial ... – 40°C to 85°C Junction Temperature (Note 2) ... 125°C Consult factory for Military grade parts. Storage Temperature Range .. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVFB Feedback Current (Note 3) 6 60 nA VFB Regulated Feedback Voltage (Note 3) ● 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 ● 1.178 1.19 1.202 mV ∆VREF Reference Output Load Regulation 0V ≤ IREF ≤ 100µA ● 2.3 15 mV
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3
: The LTC1707 is tested in a feedback loop that servos VFB to the of a device may be impaired. balance point for the error amplifier (VITH = 0.8V).
Note 2:
TJ is calculated from the ambient temperature TA and power
Note 4:
Dynamic supply current is higher due to the gate charge being dissipation PD according to the following formula: delivered at the switching frequency. TJ = TA + (PD • 110°C/W) 2