LP2980AIM5-1.8/NOPB National Semiconductor, LP2980AIM5-1.8/NOPB Datasheet - Page 13
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LP2980AIM5-1.8/NOPB
Manufacturer Part Number
LP2980AIM5-1.8/NOPB
Description
IC REG LDO MICROPOWER SOT23-5
Manufacturer
National Semiconductor
Datasheet
1.LP2980AIM5X-4.7NOPB.pdf
(16 pages)
Specifications of LP2980AIM5-1.8/NOPB
Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
2.1 ~ 16 V
Voltage - Dropout (typical)
0.12V @ 50mA
Number Of Regulators
1
Current - Output
50mA
Current - Limit (min)
100mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LP2980AIM5-1.8
LP2980AIM5-1.8TR
LP2980AIM5-1.8TR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LP2980AIM5-1.8/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
Increasing Output Current
The LP2980 can be used to control higher-current regulators,
by adding an external PNP pass device. With the PNP tran-
sistors shown in Figure 6, 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 Figure 7.
To ensure regulation, the minimum input voltage of this reg-
ulator is 6V. This “headroom” is the sum of the V
external 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
B. Recommended devices (other PNP transistors can be
used if the current gain and voltage ratings are similar).
IN
pin.
FIGURE 7. Safe Operation Boundary Curves for
FIGURE 6. 5V/400mA Regulator
BE
of the
Figure 6
13
C. Capacitor is required for regulator stability. Minimum size
is shown, and may be increased without limit.
D. Increasing the output capacitance improves transient re-
sponse and increases phase margin.
E. Maximum safe input voltage and load current are limited
by power dissipation in the PNP pass transistor and the max-
imum 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
eral ambient temperatures.
IN
and I
1207852
L
values that may be safely used for sev-
1207851
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