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LD39150PU33R Datasheet(PDF) 11 Page - STMicroelectronics

Part # LD39150PU33R
Description  Ultra low drop BICMOS voltage regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LD39150PU33R Datasheet(HTML) 11 Page - STMicroelectronics

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LD39150
Application notes
11/19
7
Application notes
7.1
External capacitors
The LD39150 requires external capacitors for regulator stability. These capacitors must be
selected to meet the requirements of minimum capacitance and equivalent series resistance
(see
Figure 15. Figure 16.). The input/output capacitors must be located less than 1cm from
the relative pins and connected directly to the input/output ground pins using traces which
have no other currents flowing through them. Any good quality of Ceramic or Electrolytic
capacitors can be used.
7.2
Input capacitor
An input capacitor whose minimum value is 1µF is required with the LD39150 (amount of
capacitance can be increased without limit). This capacitor must be located a distance of not
more than 1cm 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.
7.3
Output capacitor
It is possible to use Ceramic or Tantalum capacitors but the output capacitor must meet the
requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance)
value. A minimum capacitance of 2.2µF is a good choice to guarantee the stability of the
regulator. Anyway, other CO values can be used according to the (Figure 15. Figure 16.)
showing the allowable ESR range as a function of the output capacitance. This curve
represents the stability region over the full temperature and IO range.
7.4
Thermal note
The output capacitor must maintain its ESR in the stable region over the full operating
temperature range to assure stability. Also, capacitors tolerance and variation with
temperature must be kept in consideration in order to assure the minimum amount of
capacitance at all times.
7.5
Inhibit input operation
The inhibit pin can be used to turn OFF the regulator when pulled down, so drastically
reducing the current consumption down to less than 1µA. When the inhibit feature is not
used, this pin must be tied to VI to keep the regulator output ON at all times. To assure
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 (VIH VIL).
The inhibit pin must not be left floating because it is not internally pulled down/up.


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