LD2980CM25TR STMicroelectronics, LD2980CM25TR Datasheet - Page 14

IC REG LDO 2.5V 50MA SOT23-5L

LD2980CM25TR

Manufacturer Part Number
LD2980CM25TR
Description
IC REG LDO 2.5V 50MA SOT23-5L
Manufacturer
STMicroelectronics
Datasheet

Specifications of LD2980CM25TR

Regulator Topology
Positive Fixed
Voltage - Output
2.5V
Voltage - Input
Up to 16V
Voltage - Dropout (typical)
0.12V @ 50mA
Number Of Regulators
1
Current - Output
50mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Limit (min)
-
Other names
497-3478-2

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Application notes
External capacitors
Like any low-dropout regulator, the LD2980 requires external capacitors for regulator
stability. This capacitor must be selected to meet the requirements of minimum capacitance
and equivalent series resistance. We suggest to solder input and output capacitors as close
as possible to the relative pins.
Input capacitor
An input capacitor whose value is 1 µF is required with the LD2980 (amount of capacitance
can be increased without limit). This capacitor must be located a distance of not more than
0.5" from the input pin of the device and returned to a clean analog ground. Any good quality
ceramic, tantalum or film capacitors can be used for this capacitor.
Output capacitor
The LD2980 is designed specifically to work with ceramic output capacitors. It may also be
possible to use Tantalum capacitors, but these are not as attractive for reasons of size and
cost. By the way, the output capacitor must meet both the requirement for minimum amount
of capacitance and ESR (equivalent series resistance) value. The
show the allowable ESR range as a function of the output capacitance. These curves
represent the stability region over the full temperature and I
gain, the stability improves for higher output versions and so the suggested minimum output
capacitor value, if low ESR ceramic type is used, is 1 µF for output voltages equal or major
than 3.8 V, 2.2 µF for output voltages from 2.85 to 3.3 V, and 3.3 µF for the other versions.
However, if an output capacitor lower than the suggested one is used, it’s possible to make
stable the regulator adding a resistor in series to the capacitor (see
choose the right value according to the used version and keeping in account that the ESR of
ceramic capacitors has been measured @ 100 kHz).
Important
The output capacitor must maintain its ESR in the stable region over the full operating
temperature to assure stability. Also, capacitor tolerance and variation with temperature
must be considered to assure the minimum amount of capacitance is provided at all times.
This capacitor should be located not more than 0.5" from the output pin of the device and
returned to a clean analog ground.
Inhibit input operation
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically
reducing the current consumption down to less than 1 µA. When the inhibit feature is not
used, this pin must be tied to V
proper operation, the signal source used to drive the inhibit pin must be able to swing above
and below the specified thresholds listed in the electrical characteristics section under V
V
IL
. Any slew rate can be used to drive the inhibit.
I
to keep the regulator output ON at all times. To assure
O
range. Due to the different loop
Figure 4
Figure 1
and
and
Figure 5
Figure 2
IH
to

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