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LTC1266IS-5 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1266IS-5 Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page 7 LTC1266 LTC1266-3.3/LTC1266-5 Pin 10 Connection Shown for LTC1266-3.3 and LTC1266-5; Changes Create LTC1266 + – 16 4 1 3 15 PGND BDRIVE TDRIVE PINV BINH 2 PWR VIN R S Q C VTRIP 7 13k ITH PINV 1.265V 11 5 REFERENCE SHDN VIN VOS V G 9 SENSE+ 10 ADJUSTABLE VERSION VFB 100k 5pF VTH1 T – + VTH2 S SLEEP 12 SIGNAL GROUND 6 CT OFF-TIME CONTROL MAX ON-TIME CONTROL VIN SENSE– VFB SENSE– 8 1266 FD ENABLE LBOUT LBIN VIN 14 LB 13 1.25V REFERENCE The LTC1266 series uses a current mode, constant off- time architecture to synchronously switch an external pair of power MOSFETs. Operating frequency is set by an external capacitor at the timing capacitor Pin 6. The output voltage is sensed by an internal voltage divider connected to SENSE –, Pin 8, (LTC1266-3.3 and LTC1266- 5) or external divider returned to VFB, Pin 10, (LTC1266). A voltage comparator V, and a gain block G, compare the divided output voltage with a reference voltage of 1.265V. To optimize efficiency, the LTC1266 automatically switches between two modes of operation, burst and continuous. The voltage comparator is the primary control element when the device is in Burst Modeoperation, while the gain block controls the output voltage in continuous mode. During the switch ON cycle in continuous mode, current comparator C monitors the voltage between Pins 8 and 9 connected across an external shunt in series with the inductor. When the voltage across the shunt reaches its threshold value, the topside driver output is switched to turn off the topside MOFSET (Power VIN for P-channel or ground for N-channel). The timing capacitor connected to Pin 6 is now allowed to discharge at a rate determined by the off-time controller. The discharge current is made proportional to the output voltage (measured by Pin 8) to model the inductor current, which decays at a rate which is also proportional to the output voltage. While the timing capacitor is discharging, the bottom-side drive output is switched to power VIN to turn on the bottom-side N-channel MOSFET. FU CTIO AL DIAGRA OPERATIO |
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