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BDXXKA5WFP Datasheet(PDF) 6 Page - Rohm

Part # BDXXKA5WFP
Description  500mA Secondary LDO Regulators for Local Power Supplies
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BDXXKA5WFP Datasheet(HTML) 6 Page - Rohm

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BD□□KA5,BD□□KA5W Series,BD00KA5W Series
Technical Note
6/9
www.rohm.com
2009.04 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
1μF
Terminal Vicinity Settings and Cautions
Vcc Terminal
Please attach a capacitor (greater than 1μF) between Vcc and GND.
The capacitance values differ depending on the application, so chose a capacitor with sufficient margin and verify the
operation on actual board.
GND Terminal
Please be sure to keep the set ground and IC ground at the same potential level so that a potential difference does not
arise between them. If a potential difference arises between the set ground and the IC ground, the preset voltage will not
be output properly, causing the system to become unstable. Please reduce the impedance by making the ground patterns
as wide as possible and reducing the distance between the set ground and the IC ground as much as possible.
CTL Terminal
The CTL terminal is turned ON at 2.0V and higher, and OFF at
0.8V and lower, within the operating power supply voltage
range.The power supply and the CTL terminal may be started
up and shut down in any order without problems.
Vo Terminal
Please be sure to attach an anti-oscillation capacitor between Vo and GND.
Be sure to place an anti-oscillation capacitor between the output terminal and the GND. Oscillations may arise if the
capacitance value changes, due to factors such as temperature changes. A 1μF capacitor with small internal series
resistance (ESR) such as a ceramic capacitor is recommended as an anti-oscillation capacitor. Ceramic capacitors generally
have favorable temperature characteristics and DC bypass characteristics. When selecting a ceramic capacitor, a high
voltage capacitor (good DC bypass characteristics) with temperature characteristics that are superior to those of X5R or X7R,
is recommended. In applications where input voltage and load fluctuations are rapid, please decide on a capacitor after
sufficiently confirming its properties according to its specifications in the actual application.
CTL
25kΩ
31.25kΩ
Fig.23 Input equivalent circuit
OUT
IC
0.01
0.1
1
10
100
0
100
200
300
400
500
Iout(mA)
安定領域
発振領域
Vcc
OUT
CTL GND ADJ
R1
R2
Cin
Vcc
VCTL
2V
1μF
1μF
ESR
Io(ROUT)
R1=30kΩ,R2=2kΩ
Fig.24 Output Equivalent Circuit
Fig.25 ESR-Io Characteristics
Oscillation region
Stable region
Io(mA)
0
20
40
60
80
100
120
01234
直流バイアスVdc(V)
0
20
40
60
80
100
120
01234
直流バイアスVdc(V)
0
20
40
60
80
100
120
-25
0
255075
Temp(℃)
50V Max.Input
16V Max.Input
10V Max.Input
16V Max.Input
10V Max.Input
Y5V
X7R
X5R
Vdc=0
Fig.26 :General characteristics of ceramic capacitors
50V Max.Input
DC bypass Vdc(V)
DC bypass Vdc(V)
(a)
Capacitance-bypass
characteristics (Y5V)
b)Capacitance-bypass
characteristics(X5R,X7R)
Temp(℃)
C)Capacitance-temperature
characteristics(X5R,X7R,Y5V)


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