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LTC3203B Datasheet(PDF) 9 Page - Linear Technology |
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LTC3203B Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page LTC3203/LTC3203-1 LTC3203B/LTC3203B-1 9 32031fa When the output voltage drops enough to overcome the burst comparator hysteresis, the part wakes up and com- mences normal fixed frequency operation. The output capacitor recharges and causes the part to re-enter the Sleep state if the output load still remains less than the Burst Mode threshold. This Burst Mode threshold varies with VIN, VOUT and the choice of output storage capacitor. Short-Circuit/Thermal Protection The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 have built-in short-circuit current limit as well as over-tempera- ture protection. During a short-circuit condition, the chip will automatically limit the output current to approximately 1A. At higher temperatures, or if the input voltage is high enough to cause excessive self-heating of the part, the thermal shutdown circuitry will shut down the charge pump once the junction temperature exceeds approxi- mately 150 °C. It will enable the charge pump once the junction temperature drops back to approximately 135 °C. The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 will cycle in and out of thermal shutdown indefinitely without latch-up or damage until the short circuit condition on VOUT is removed. Soft-Start To prevent excessive current flow at VIN during start-up, the LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 have built-in soft-start circuitry. Soft-start is achieved by in- creasing the amount of current available to the output charge storage capacitor linearly over a period of approxi- mately 250 µs. OPERATIO |
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