LP2980AIM5-3.0 National Semiconductor, LP2980AIM5-3.0 Datasheet - Page 15

• Manufacturer Part Number: LP2980AIM5-3.0
• Description: Linear Voltage Regulator IC
• Manufacturer: National Semiconductor

Specifications of LP2980AIM5-3.0

• No. Of Pins: 5
• Output Current: 50mA
• Mounting Type: Surface Mount
• Voltage Regulator Type: LDO Linear
• Peak Reflow Compatible (260 C): No
• Supply Voltage: 16V
• Current Rating: 50A
• Output Voltage Max: 3V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Applications
01207851
FIGURE 5. 5V/400mA Regulator
The LP2980 can be used to control higher-current regulators, by adding an external PNP pass device. With the PNP transistors
shown in , the output current can be as high as 400 mA, as long as the input voltage is held within the Safe Operation Boundary
Curves shown below in.
To ensure regulation, the minimum input voltage of this regulator is 6V. This “headroom” is the sum of the V
of the external
BE
transistor and the dropout voltage of the LP2980.
Notes:
A. Drive this input with a logic signal (see Application Hints). If the shutdown function is not to be used, tie the ON/OFF pin directly
to the V
pin.
IN
B. Recommended devices (other PNP transistors can be used if the current gain and voltage ratings are similar).
C. Capacitor is required for regulator stability. Minimum size is shown, and may be increased without limit.
D. Increasing the output capacitance improves transient response and increases phase margin.
E. Maximum safe input voltage and load current are limited by power dissipation in the PNP pass transistor and the maximum
ambient temperature for the specific application. If a TO-92 transistor such as the MPS2907A is used, the thermal resistance from
junction-to-ambient is 180˚C/W in still air.
Assuming a maximum allowable junction temperature of 150˚C for the MPS2907A device, the following curves show the
maximum V
and I
values that may be safely used for several ambient temperatures.
IN
L
01207852
FIGURE 6. Safe Operation Boundary Curves for
Figure 5
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