Datasheet LTC1627 (Analog Devices) - 2

LTC1627
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 Driver Supply Voltage (V NUMBER IN – VDR) ... – 0.3V to 10V I 1 8 SYNC/FCB TH ITH Voltage .. – 0.3V to 5V RUN/SS 2 7 VDR Run/SS, V LTC1627CS8 FB Voltages .. – 0.3V to VIN V 3 6 V LTC1627IS8 FB IN Sync/FCB Voltage .. – 0.3V to VIN GND 4 5 SW VDR Voltage (VIN ≤ 5V) ... – 5V to 0.3V S8 PART MARKING P-Channel Switch Source Current (DC) .. 800mA S8 PACKAGE 8-LEAD PLASTIC SO N-Channel Switch Sink Current (DC) .. 800mA 1627 Peak SW Sink and Source Current ... 1.5A TJMAX = 125°C, θJA = 110°C/ W 1627I Operating Ambient Temperature Range Commercial .. 0°C to 70°C Consult factory for Military grade parts. 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
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) 20 60 nA VFB Regulated Feedback Voltage (Note 3) ● 0.788 0.80 0.812 V ∆VOVL ∆Output Overvoltage Lockout ∆VOVL = VOVL – VFB 20 60 110 mV ∆VFB Reference Voltage Line Regulation VIN = 2.8V 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) Synchronized VIN = 8.5V, VOUT = 3.3V, Frequency = 525kHz 450 µA Burst Mode Operation VITH = 0V, VIN = 8.5V, VSYNC/FCB = Open 200 320 µA Shutdown VRUN/SS = 0V, 2.65V < VIN < 8.5V 15 35 µA Shutdown VRUN/SS = 0V, VIN < 2.65V 6 µA VRUN/SS Run/SS Threshold 0.4 0.7 1.0 V IRUN/SS Soft-Start Current Source VRUN/SS = 0V 1.2 2.25 3.3 µA VSYNC/FCB Auxiliary Feedback Threshold VSYNC/FCB Ramping Negative 0.730 0.8 0.860 V ISYNC/FCB Auxiliary Feedback Current VSYNC/FCB = 0V 0.5 1.5 2.5 µA fOSC Oscillator Frequency VFB = 0.8V 315 350 385 kHz VFB = 0V 35 kHz VUVLO Undervoltage Lockout VIN Ramping Down from 3V (–40°C to 85°C) 2.3 2.50 2.65 V VIN Ramping Up from 0V (–40°C to 85°C) 2.65 2.85 V VIN Ramping Down from 3V (0°C to 70°C) 2.4 2.50 2.65 V VIN Ramping Up from 0V (0°C to 70°C) 2.65 2.80 V RPFET RDS(ON) of P-Channel FET (VIN – VDR) = 5V, ISW = 100mA 0.5 0.7 Ω RNFET RDS(ON) of N-Channel FET ISW = – 100mA 0.6 0.8 Ω ILSW SW Leakage VRUN/SS = 0V ±10 ±1000 nA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3
: The LTC1627 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