LT3030HFE-PBF 데이터 시트보기 (PDF) - Linear Technology

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LT3030HFE-PBF

Dual 750mA/250mA Low Dropout, Low Noise, Micropower Linear Regulator

Linear Technology 

LT3030

Applications Information

drops to less than 2μA. This occurs if the IN pin is con-

nected to a discharged (low voltage) battery, and either

a backup battery or a second regulator circuit holds up

the output. The state of that channel’s SHDN pin has no

effect on the reverse output current if the output is pulled

above the input.

Overload Recovery

Like many IC power regulators, the LT3030 has safe

operating area (SOA) protection. The safe area protec-

tion decreases current limit as input-to-output voltage

increases and keeps the power transistor inside a safe

operating region for all values of input-to-output voltage.

The protective design provides some output current at

all values of input-to-output voltage up to the specified

maximum operational input voltage of 20V.

When power is first applied, as input voltage rises, the

output follows the input, allowing the regulator to start-up

into heavy loads. During start-up, as the input voltage is

rising, the input-to-output voltage differential is small, al-

lowing the regulator to supply large output currents. With

a high input voltage, an event can occur wherein removal

of an output short will not allow the output to recover. The

event occurs with a heavy output load when the input voltage

is high and the output voltage is low. Common situations

occur immediately after the removal of a short-circuit or if

the shutdown pin is pulled high after the input voltage has

already been turned on. The load line intersects the output

current curve at two points creating two stable output oper-

ating points for the regulator. With this double intersection,

the input power supply may need to be cycled down to zero

and brought up again to make the output recover.

For more information www.linear.com/LT3030

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