LP2950CZ-5.0RP ON Semiconductor, LP2950CZ-5.0RP Datasheet - Page 9
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LP2950CZ-5.0RP
Manufacturer Part Number
LP2950CZ-5.0RP
Description
IC REG LDO LP 100MA 5V TO-92
Manufacturer
ON Semiconductor
Datasheet
1.LP2951ACDR2G.pdf
(23 pages)
Specifications of LP2950CZ-5.0RP
Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
Up to 30V
Voltage - Dropout (typical)
0.35V @ 100mA
Number Of Regulators
1
Current - Output
100mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-92-3 (Standard Body), TO-226
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Limit (min)
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LP2950CZ-5.0RPG
Manufacturer:
ON Semiconductor
Quantity:
2 100
Introduction
internal current limiting and thermal shutdown making them
user−friendly. Typical application circuits for the LP2950
and LP2951 are shown in Figures 20 through 28.
require a 1.0 mF (or greater) capacitance between the
LP2950/LP2951 output terminal and ground for stability.
Most types of aluminum, tantalum or multilayer ceramic
will perform adequately. Solid tantalums or appropriate
multilayer ceramic capacitors are recommended for
operation below 25°C.
is required for output stability. The capacitor can be reduced
to 0.33 mF for currents less than 10 mA, or 0.1 mF for currents
below 1.0 mA. Using the 8 pin versions at voltages less than
5.0 V operates the error amplifier at lower values of gain, so
that more output capacitance is needed for stability. For the
worst case operating condition of a 100 mA load at 1.23 V
output (output Pin 1 connected to the feedback Pin 7) a
minimum capacitance of 3.3 mF is recommended.
operated with no output load. When setting the output
voltage of the LP2951 with external resistors, the resistance
values should be chosen to draw a minimum of 1.0 mA.
LP2950/LP2951 input to ground if more than 4 inches of
wire connects the input to either a battery or power supply
filter capacitor.
create a pole, causing instability if high value external
resistors are used to set the output voltage. Adding a 100 pF
capacitor between the Output Pin 1 and the Feedback Pin 7
and increasing the output filter capacitor to at least 3.3 mF
will stabilize the feedback loop.
Error Detection Comparator
the LP2951 output voltage falls more than approximately
5.0% out of regulation. This value is the comparator’s
designed−in offset voltage of 60 mV divided by the 1.235 V
internal reference. As shown in the representative block
diagram. This trip level remains 5.0% below normal
regardless of the value of regulated output voltage. For
example, the error flag trip level is 4.75 V for a normal 5.0 V
regulated output, or 9.50 V for a 10 V output voltage.
signal and the regulated output voltage as the input voltage
The LP2950/LP2951 regulators are designed with
These regulators are not internally compensated and thus
At lower values of output current, less output capacitance
The LP2950 will remain stable and in regulation when
A bypass capacitor is recommended across the
Input capacitance at the LP2951 Feedback Pin 7 can
The comparator switches to a positive logic low whenever
Figure 2 is a timing diagram which shows the ERROR
APPLICATIONS INFORMATION
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9
to the LP2951 is ramped up and down. The ERROR signal
becomes valid (low) at about 1.3 V input. It goes high when
the input reaches about 5.0 V (V
Since the LP2951’s dropout voltage is dependent upon the
load current (refer to the curve in the Typical Performance
Characteristics), the input voltage trip point will vary with
load current. The output voltage trip point does not vary
with load.
requires an external pullup resistor. This resistor may be
returned to the output or some other voltage within the
system. The resistance value should be chosen to be
consistent with the 400 mA sink capability of the error
comparator. A value between 100 k and 1.0 MW is
suggested. No pullup resistance is required if this output is
unused.
comparator output will go high if it has been pulled up to an
external supply. To avoid this invalid response, the error
comparator output should be pulled up to V
Figure 18).
Programming the Output Voltage (LP2951)
fixed output voltage using its internal voltage divider by
tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to
Pin 6 (5.0 V tap). Alternatively, it may be programmed for
any output voltage between its 1.235 reference voltage and
its 30 V maximum rating. An external pair of resistors is
required, as shown in Figure 19.
ERROR
Voltage
Voltage
Output
The error comparator output is an open collector which
When operated in the shutdown mode, the error
The LP2951CX may be pin−strapped for the nominal
Input
Valid
Not
1.3 V
Figure 18. ERROR Output Timing
4.75 V
4.75 V + V
dropout
5.0 V
4.70 V + V
out
4.70 V
exceeds about 4.75 V).
1.3 V
dropout
Not
Valid
Pullup
to V
out
Pullup
to Ext
out
(see