LP2953IMX-3.3 National Semiconductor, LP2953IMX-3.3 Datasheet - Page 16

• Manufacturer Part Number: LP2953IMX-3.3
• Description: IC REG LDO 3.3V 250MA 16-SOIC
• Manufacturer: National Semiconductor

Specifications of LP2953IMX-3.3

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: Up to 30V
• Voltage - Dropout (typical): 0.47V @ 250mA
• Number Of Regulators: 1
• Current - Output: 250mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: *LP2953IMX-3.3

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Application Hints
SHUTDOWN INPUT
A logic-level signal will shut off the regulator output when a
“LOW” (
To prevent possible mis-operation, the Shutdown input must
be actively terminated. If the input is driven from open-
collector logic, a pull-up resistor (20 kΩ to 100 kΩ recom-
mended) should be connected from the Shutdown input to
the regulator input.
If the Shutdown input is driven from a source that actively
pulls high and low (like an op-amp), the pull-up resistor is not
required, but may be used.
If the shutdown function is not to be used, the cost of the
pull-up resistor can be saved by simply tying the Shutdown
input directly to the regulator input.
IMPORTANT: Since the Absolute Maximum Ratings state
that the Shutdown input can not go more than 0.3V below
ground, the reverse-battery protection feature which protects
the regulator input is sacrificed if the Shutdown input is tied
directly to the regulator input.
If reverse-battery protection is required in an application, the
pull-up resistor between the Shutdown input and the regula-
tor input must be used.
Typical Applications
<
1.2V) is applied to the Shutdown input.
Basic 5V Regulator
(Continued)
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* Output voltage equals +V
output current. Current limits at a maximum of 380 mA (typical).
** Select R1 so that the comparator input voltage is 1.23V at the output
voltage which corresponds to the desired fault current value.
5V Current Limiter with Load Fault Indicator
Low T.C. Current Sink
IN
minum dropout voltage, which varies with
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