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BD3512MUV датащи(PDF) 11 Page - Rohm

номер детали BD3512MUV
подробное описание детали  Ultra Low Dropout Linear Regulators for PC Chipsets with Power Good
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
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BD3512MUV датащи(HTML) 11 Page - Rohm

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●Recommended Circuit Example
Component
Recommended
Value
Programming Notes and Precautions
R18/R19
3.3k/3.9k
IC output voltage can be set with a configuration formula VFB×(R18+R19)/R19 using the
values for the internal reference output voltage (VFB) and the output voltage resistors (R18,
R19). Select resistance values that will avoid the impact of the FB bias current (±100nA).
The recommended total resistance value is 10KΩ.
R4
100k
This is the pull-up resistance for open drain pin. It is recommended to set the value about
100kΩ.
C16
22μF
To assure output voltage stability, please be certain the Vo1~Vo5 pins and the GND pins
are connected. Output capacitors play a role in loop gain phase compensation and in
mitigating output fluctuation during rapid changes in load level. Insufficient capacitance
may cause oscillation, while high equivalent series reisistance (ESR) will exacerbate
output voltage fluctuation under rapid load change conditions. While a 22μF ceramic
capacitor is recomended, actual stability is highly dependent on temperature and load
conditions. Also, note that connecting different types of capacitors in series may result in
insufficient total phase compensation, thus causing oscillation. In light of this information,
please confirm operation across a variety of temperature and load conditions.
C6/C5
1μF/0.1μF
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VCC) input pins. If the impedance of this power supply were to increase, input voltage
(VCC) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 1μF / 0.1μF capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
C9
10μF
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VIN) input pins. If the impedance of this power supply were to increase, input voltage
(VIN) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 10 μ F capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
C20
0.01μF
The Non Rush Current on Startup (NRCS) function is built into the IC to prevent rush
current from going through the load (VIN to VO) and impacting output capacitors at power
supply start-up. Constant current comes from the NRCS pin when EN is HIGH or the
UVLO function is deactivated. The temporary reference voltage is proportionate to time,
due to the current charge of the NRCS pin capacitor, and output voltage start-up is
proportionate to this reference voltage. Capacitors with low susceptibility to temperature
are recommended, in order to assure a stable soft-start time.
CFB
1000pF
This component is employed when the C16 capacitor causes, or may cause, oscillation. It
provides more precise internal phase correction.
C16
C20
R19
R18
Vo (1.2V/3A)
16
17
18
19
20
1
2
3
4
5
15
14
13
12
11
10
9
8
7
6
C9
VIN
C6
VCC
VEN
R4
VPGOOD
VCC
C5
CFB
C2
C3
R9
R8


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