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LT3485-1 Datasheet(PDF) 7 Page - Linear Technology |
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LT3485-1 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LT3485-0/LT3485-1/ LT3485-2/LT3485-3 7 34850123fb CHARGE (Pin 1): Charge Pin. A low (<0.3V) to high (>1V) transition on this pin puts the part into power delivery mode. Once the target voltage is reached, the part will stop charging the output. Toggle this pin to start charging again. Bringing the pin low (<0.3V) will terminate the power delivery and put the part in shutdown. VBAT (Pin 2): Battery Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. Battery supply must be 1.7V or higher. VIN (Pin 3): Input Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. Input supply must be 2.5V or higher. SW (Pins 4, 5): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to this pin to minimize EMI. Tie one side of the primary of the transformer to this pin. The target output voltage is set by the turns ratio of the transformer. Choose Turns Ratio N by the following equation: N VOUT = + 2 31 5 . where VOUT is the desired output voltage. IGBTOUT (Pin 6): Output Drive for IGBT Gate. Connect this pin to the gate of the IGBT. IGBTIN (Pin 7): Logic Input Pin for IGBT Drive. When this pin is driven higher than 1.5V, the IGBT output pin goes high. When the pin is below 0.3V, the output is low. IGBTPWR (Pin 8): Input Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. Input supply must be 0.1V higher than the turn-on voltage for the IGBT. DONE (Pin 9): Open NPN Collector Indication Pin. When target output voltage is reached, NPN turns on. This pin needs a pull-up resistor or current source. VMONT (Pin 10): Supplies a voltage proportional to the output voltage where 1V is the end of charge voltage. Only valid while the part is charging. Exposed Pad (Pin 11): Ground. Tie directly to local ground plane. PI FU CTIO S |
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Similar Description - LT3485-1 |
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