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LTC1148HV Datasheet(PDF) 5 Page - Linear Technology |
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LTC1148HV Datasheet(HTML) 5 Page - Linear Technology |
5 / 20 page 5 LTC1148 LTC1148-3.3/LTC1148-5 CC HARA TERISTICS A TYPICALPERFOR CE Current Sense Threshold Voltage TEMPERATURE (°C) 0 0 25 50 75 175 125 20 40 150 100 60 80 100 MAXIMUM THRESHOLD MINIMUM THRESHOLD LTC1148 • TPC09 Off Time vs VOUT OUTPUT VOLTAGE (V) 0 40 50 60 4 LTC1148 • TPC08 30 20 0 1 23 10 80 70 5 LTC1148-5 LTC1148-3.3 VSENSE – = V OUT Gate Charge Supply Current OPERATING FREQUENCY (kHz) 20 0 4 8 12 28 20 80 140 24 16 200 260 QN + QP = 100nC QN + QP = 50nC LTC1148 • TPC07 P-DRIVE (Pin 1): High Current Drive for Top P-Channel MOSFET. Voltage swing at this pin is from VIN to ground. NC (Pin 2): No Connection. Can connect to power ground. VIN (Pin 3): Main Supply Pin. Must be closely decoupled to power ground Pin 12. CT (Pin 4): External capacitor CT from Pin 4 to ground sets the operating frequency. The actual frequency is also dependent upon the input voltage. INTVCC (Pin 5): Internal Supply Voltage, Nominally 3.3V. Can be decoupled to signal ground. Do not externally load this pin. ITH (Pin 6): Gain Amplifier Decoupling Point. The current comparator threshold increases with the Pin 6 voltage. SENSE – (Pin 7): Connects to internal resistive divider which sets the output voltage in LTC1148-3.3 and LTC1148-5 versions. Pin 7 is also the (–) input for the current comparator. SENSE + (Pin 8): The (+) Input to the Current Comparator. A built-in offset between Pins 7 and 8 in conjunction with RSENSE sets the current trip threshold. VFB (Pin 9): For the LTC1148 adjustable version, Pin 9 serves as the feedback pin from an external resistive divider used to set the output voltage. On LTC1148-3.3 and LTC1148-5 versions this pin is not used. SHUTDOWN (Pin 10): When grounded, the LTC1148 series operates normally. Pulling Pin 10 high holds both MOSFETs off and puts the LTC1148 series in micropower shutdown mode. Requires CMOS logic signal with tR, tF < 1µs, should not be left floating. SGND (Pin 11): Small-Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. PGND (Pin 12): Driver Power Ground. Connects to source of N-channel MOSFET and the (–) terminal of CIN. NC (Pin 13): No Connection. Can connect to power ground. N-DRIVE (Pin 14): High Current Drive for Bottom N-Channel MOSFET. Voltage swing at Pin 14 is from ground to VIN. PI FU CTIO S |
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