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LD3986J29R-E データシート(PDF) 8 Page - STMicroelectronics

部品番号 LD3986J29R-E
部品情報  DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LD3986J29R-E データシート(HTML) 8 Page - STMicroelectronics

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LD3986 SERIES
8/12
APPLICATION INFORMATION
CURRENT LIMIT
The device includes short-circuit protection. It
includes a current limiter that controls the pass
transistor’s gate voltage to limit the output current
to about 600mA.
THERMAL OVERLOAD PROTECTION
The Thermal over load protection limits total
power dissipation in the device. When the junction
temperature (TJ) exceeds +160°C, the thermal
sensor sends a signal to the shutdown logic,
turning off the pass transistors and allowing the
device to cool. The pass transistors turns on again
after the device’s junction temperature typically
cools by 20°C, resulting in a pulsed output during
continuous thermal overload conditions.
POWER DISSIPATION
Maximum
power
dissipation
of
the
device
depends on the thermal resistance of the case
and circuit board, the temperature difference
between the die junction and ambient air, and the
rate of air flow. The power dissipated by the
device is:
PD = IO (VI -VO)
The maximum power dissipation is:
PMAX = (TJMAX - TA) / RTH
Where:
TJMAX = +125°C
TA is the ambient temperature
RTH thermal resistance.
The device’s pins perform the dual function of
providing an electrical connection as well as
channeling heat away from the die. Use wide
circuit-board
traces and large, solid
copper
polygons to improve power dissipation. Using
multiple vias to buried ground planes further
enhances thermal conductivity.
INPUT CAPACITOR
An input capacitance of
≈ 1µF is required between
the LD3986 input pin and ground (the amount of
the capacitance may be increased without limit).
This capacitor must be located a distance of not
more than 1cm from the input pin and returned to
a clean analog ground. Any good quality ceramic,
tantalum, or film capacitor may be used at the
input.
Important:
Tantalum
capacitors
can
suffer
catastrophic failures due to surge current when
connected to a low impedance source of power
(like a battery or a very large capacitor). If a
tantalum capacitor is used at the input, it must be
guaranteed by the manufacturer to have a surge
current rating sufficient for the application.
There are no requirements for the ESR on the
input capacitor, but tolerance and temperature
coefficient must be considered when selecting the
capacitor to ensure
the capacitance will be
≈ 1µF over the entire
operating temperature range.
OUTPUT CAPACITOR
The LD3986 is designed specifically to work with
very small ceramic output capacitors, any ceramic
capacitor (temperature characteristics X7R, X5R,
Z5U or Y5V) in 1 to 22 µF range with 5m. to 500m.
ESR range is suitable in the LD3986 application
circuit. it may also be possible to use tantalum or
film capacitors at the output, but these are not as
attractive for reasons of size and cost.
The output capacitor must meet the requirement
for minimum amount of capacitance and also have
an ESR (Equivalent Series Resistance) value
which is within a stable range.
NOISE BYPASS CAPACITOR
Connecting a 0.01µF capacitor between the CBYP
pin and ground significantly reduces noise on both
regulator outputs.
This cap is connected directly to a high impedance
node in the band gap reference circuit. Any
significant loading on this node will cause a
change on the regulated output voltage.
For this reason, DC leakage current through this
pin must be kept as low as possible for best output
voltage accuracy. The use of this 0.01µF bypass
capacitor is strongly recommended to prevent
overshoot on the output during start up.
The types of capacitors best suited for the noise
bypass
capacitor
are
ceramic
and
film.
High-quality ceramic capacitors with either NPO
or COG dielectric typically have very low leakage.
Polypropylene and polycarbonate film capacitors
are available in small surface-mount packages
and typically have extremely low leakage current.
Unlike many other LDO’s, addition of a noise
reduction capacitor does not effect the transient
response of the device.
TURN-ON/OFF INPUT OPERATION
Each LD3986 output is turned off by pulling the
relevant EN pin low, and turned on by pulling it
high. To assure proper operation, the signal


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