bd00c0awfp ROHM Co. Ltd., bd00c0awfp Datasheet - Page 9

• Manufacturer Part Number: bd00c0awfp
• Description: 1a Standard Variable Output Ldo Regulators
• Manufacturer: ROHM Co. Ltd.

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BD00C0AWFP,BD00C0AWCP-V5
© 2011 ROHM Co., Ltd. All rights reserved.
10. Output pin
11. CTL pin
12. For a steep change of the Vcc voltage
13. For an infinitesimal fluctuations of output voltage.
14. Over current protection circuit (OCP)
15. Thermal shutdown circuit (TSD)
It is necessary to place capacitors between each output pin and GND to prevent oscillation on the output. Usable
capacitance values range from 1µF to 1000µF. Ceramic capacitors can be used as long as their ESR value is low enough
to prevent oscillation (0.001Ω to 20Ω). Abrupt fluctuations in input voltage and load conditions may affect the output
voltage. Output capacitance values should be determined only through sufficient testing of the actual application.
Do not make voltage level of chip enable pin keep floating level, or in between VthH and VthL. Otherwise, the output
voltage would be unstable or indefinite.
Because MOS FET for output Transistor is used when an input voltage change is very steep, it may evoke large current.
When selecting the value of external circuit constants, please make sure that the operation on the actual application takes
these conditions into account.
At the use of the application that infinitesimal fluctuations of output voltage caused by some factors (e.g. disturbance noise,
input voltage fluctuations, load fluctuations, etc.), please take enough measures to avoid some influence (e.g. insert the
filter, etc.).
The IC incorporates an integrated over-current protection circuit that operates in accordance with the rated output capacity.
This circuit serves to protect the IC from damage when the load becomes shorted. It is also designed to limit output current
(without latching) in the event of a large and instantaneous current flow from a large capacitor or other component. These
protection circuits are effective in preventing damage due to sudden and unexpected accidents. However, the IC should
not be used in applications characterized by the continuous or transitive operation of the protection circuits.
The IC incorporates a built-in thermal shutdown circuit, which is designed to turn the IC off completely in the event of
thermal overload. It is not designed to protect the IC from damage or guarantee its operation. ICs should not be used after
this function has activated, or in applications where the operation of this circuit is assumed.
0.001
Cout_ESR vs Io(reference data)
0.01
100
0.1
10
1
0
Vcc=4V ～ 25V
Ta=-40 ℃～ +105 ℃
R1=5k Ω～ 10k Ω
Cin=2.2µF ～ 100µF Cout=1µF ～ 100µF
200
Unstable operating region
Stable operating region
400
Io(mA)
Vo=3V ～ 15V
600
Vcc
800
(4～25V)
1000
※ Operation Notes 10 Measurement circuit
(1μF～)
Cin
100
2.2
10
1
Vcc=4V ～ 25V
Ta=-40 ℃～ +105 ℃
R1=5k Ω～ 10k Ω
1
operating region
V
(5V)
CTL
Unstable
CTL
Vcc
Stable operating region
9/11
Cout（μF）
Vo=3V ～ 15V
GND
10
Io=0A ～ 1A
ADJ
Vo
Cin vs Cout(reference data)
100
Cout(1μF～)
（5k～10kΩ）
R2
R1
100
10
1
Vcc=6V ～ 25V
Ta=-40 ℃～ +105 ℃
R1=5k Ω～ 10k Ω
1
ESR
(0.001Ω～)
Stable operating region
Io(ROUT)
Cout(μF)
Vo=5V ～ 15V
10
Io=0A ～ 1A
Technical Note
2011.08 - Rev.B
100