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LTC1266CS-3.3 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1266CS-3.3 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  6 LTC1266 LTC1266-3.3/LTC1266-5 TDRIVE (Pin 1): High Current Drive for Topside MOSFET. This MOSFET can be either P-channel or N-channel, user selectable by Pin 3. Voltage swing at this pin is from PWR VIN to ground. PWR VIN (Pin 2): Power Suppy for Drive Signals. Must be closely decoupled to power ground (Pin 15). PINV (Pin 3): Phase Invert. Sets the phase of the topside driver to drive either a P-channel or an N-channel MOSFET as follows: P-channel: Pin 3 = 0V N-channel: Pin 3 = PWR VIN BINH (Pin 4): Burst Mode Operation Inhibit. A CMOS logic high on this pin will disable the Burst Mode operation feature forcing continuous operation down to zero load. VIN (Pin 5): Main Supply Pin. CT (Pin 6): External Capacitor. CT from Pin 4 to ground sets the operating frequency. The actual frequency is also dependent on the input voltage. ITH (Pin 7): Gain Amplifier Decoupling Point. The current comparator threshold increases with the Pin 7 voltage. SENSE – (Pin 8): Connects to internal resistive divider which sets the output voltage in LTC1266-3.3 and LTC1266-5 versions. Pin 8 is also the (–) input for the current comparator. SENSE + (Pin 9): The (+) Input to the Current Comparator. A built-in offset between Pins 8 and 9 in conjunction with RSENSE sets the current trip threshold. VFB (Pin 10): For the LTC1266 adjustable version, Pin 10 serves as the feedback pin from an external resistive divider used to set the output voltage. On LTC1266-3.3 and LTC1266-5 versions this pin is not used. SHDN (Pin 11): When grounded, the LTC1266 series operates normally. Pulling Pin 11 high holds both MOSFETs off and puts the LTC1266 in micropower shut- down mode. Requires CMOS logic signal with tr, tf < 1µs. Should not be left floating. SGND (Pin 12): Small-Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. LBIN (Pin 13): Input to the Low-Battery Comparator. This input is compared to an internal 1.25V reference. LBOUT (Pin 14): Open Drain Output of the Low-Battery Comparator. This pin will sink current when Pin 13 is below 1.25V. PGND (Pin 15): Driver Power Ground. Connects to source of N-channel MOSFET and the (–) terminal of CIN. BDRIVE (Pin 16): High Current Drive for Bottom N-Channel MOSFET. Voltage swing at Pin 16 is from ground to PWR VIN. PI FU CTIO S OUTPUT VOLTAGE (V) 01 40 60 5 1266 G10 20 0 2 34 100 80 LTC1266-3.3 LTC1266-5 VSENSE – = VOUT (VIN – VOUT) VOLTAGE (V) 0 2.5 3.0 12 10 8 1266 G11 0.5 1.5 2.0 1.0 0 2 4 6 14 16 VOUT = 3.3V 0 °C 70 °C 25 °C TEMPERATURE ( °C) 0 100 150 200 80 1266 G12 50 0 –50 20 40 60 100 MAX THRESHOLD MIN THRESHOLD (Burst Mode OPERATION INHIBIT) MIN THRESHOLD (Burst Mode OPERATION ENABLED) Off-Time vs Output Voltage Operating Frequency vs (VIN – VOUT) Voltage Current Sense Threshold Voltage TYPICAL PERFOR A CE CHARACTERISTICS |
Similar Part No. - LTC1266CS-3.3 |
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Similar Description - LTC1266CS-3.3 |
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