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LTC3203B-1 Datasheet(PDF) 9 Page - Linear Technology

Part No. LTC3203B-1
Description  500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3203B-1 Datasheet(HTML) 9 Page - Linear Technology

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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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