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PDF LDFMPVR Data sheet ( Hoja de datos )

Número de pieza LDFMPVR
Descripción 500 mA very low drop voltage regulator
Fabricantes STMicroelectronics 
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No Preview Available ! LDFMPVR Hoja de datos, Descripción, Manual

LDFM
500 mA very low drop voltage regulator
Datasheet - production data
Features
Input voltage from 2.5 to 16 V
Very low dropout voltage (300 mV max. at
500 mA load)
Low quiescent current (200 µA typ. @ 500
mA load)
Available in 1% precision in PPAK and
DFN6 packages, 2% in DPAK
500 mA guaranteed output current
Wide range of output voltages available on
request: adjustable from 0.8 V, fixed up to
12 V in 100 mV steps
Logic-controlled electronic shutdown
Power Good (PPAK and DFN packages)
Fast dynamic response to line and load
changes
Internal current and thermal protection
Temperature range: - 40 °C to 125 °C
Applications
PCs and laptop computers
Battery-powered equipment
Industrial and medical equipment
Portable equipment
Description
The LDFM is a fast, very low drop linear regulator
which operates from an input supply voltage in
the range of 2.5 V to 16 V.
It is available in fixed and adjustable output
voltage versions, from 0.8 V to 12 V.
The LDFM features high output precision, very
low dropout voltage, low noise, and low quiescent
current, therefore suitable for low voltage
microprocessors and memory applications.
Enable logic control pin and Power Good output
are featured on PPAK/DFN packages.
Current and thermal protection are provided.
September 2016
DocID023585 Rev 4
This is information on a product in full production.
1/36
www.st.com

1 page




LDFMPVR pdf
LDFM
3
Typical application
Figure 3: Fixed versions
Typical application
Figure 4: Adjustable version (PPAK and DFN6 packages only)
DocID023585 Rev 4
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LDFMPVR arduino
LDFM
6
6.1
6.1.1
6.1.2
6.2
6.3
Application information
Application information
External capacitors
The LDFM requires external capacitors for regulator stability. These capacitors must be
selected to meet the requirements of minimum capacitance and equivalent series
resistance (see Figure 25: "Stability plane adj (COUT, ESR)" and Figure 26: "Stability plane
3.3 V (COUT, ESR)"). It is advisable to locate the input/output capacitors as close as
possible to the relative pins.
Input capacitor
An input capacitor with a minimum value of 1 µF is required with the LDFM. 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 capacitors can be used for
this capacitor.
Output capacitor
It is possible to use ceramic capacitors but the output capacitor must meet the
requirements for minimum amount of capacitance and E.S.R. (equivalent series resistance)
value.
A minimum capacitance of 2.2 µF is a good choice to guarantee the stability of the
regulator. However, other COUT values can be used according to Figure 25: "Stability plane
adj (COUT, ESR)" and Figure 26: "Stability plane 3.3 V (COUT, ESR)", showing the allowable
ESR range as a function of the output capacitance.
The output capacitor must maintain its ESR in the stable region over the full operating
temperature range to assure stability. Also, capacitor tolerance and variation with
temperature must be kept in consideration in order to assure the minimum amount of
capacitance at all times.
Enable pin operation
The Enable pin can be used to turn OFF the regulator when pulled down, so drastically
reducing the current consumption. When the enable feature is not used, this pin must be
tied to VIN to keep the regulator output ON at all times. To assure proper operation, the
signal source used to drive the Enable pin must be able to swing above and below the
specified thresholds listed in the electrical characteristics section (VEN). The Enable pin
must not be left floating because it is not internally pulled down/up.
Power Good
The LDFM features an open drain Power Good (PG) pin to sequence external supplies or
loads and to provide fault detection. This pin requires an external resistor (RPG) to pull PG
high when the output is within the PG tolerance window. Typical values for this resistor
range from 10 kΩ to 100 kΩ.
DocID023585 Rev 4
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