LP2952 National Semiconductor, LP2952 Datasheet - Page 13

• Manufacturer Part Number: LP2952
• Description: Adjustable Micropower Low-Dropout Voltage Regulators
• Manufacturer: National Semiconductor

Application Hints
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
Typical Applications
Low T.C. Current Sink
Basic 5V Regulator
(Continued)
DS011127-15
DS011127-17
* 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.
* Connect to Logic or µP control inputs.
LOW BATT flag warns the user that the battery has discharged down to
about 5.8V, giving the user time to recharge the battery or power down
some hardware with high power requirements. The output is still in
regulation at this time.
OUT OF REGULATION flag indicates when the battery is almost
completely discharged, and can be used to initiate a power-down
sequence.
13
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.
5V Current Limiter with Load Fault Indicator
LOW BATTERY and OUT OF REGULATION
5V Regulator with Error Flags for
IN
minum dropout voltage, which varies with
DS011127-16
DS011127-18
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