bd00d0awhfp ROHM Co. Ltd., bd00d0awhfp Datasheet - Page 9

• Manufacturer Part Number: bd00d0awhfp
• Description: 2a Standard Variable Output Ldo Regulator
• Manufacturer: ROHM Co. Ltd.

BD00D0AWHFP
© 2011 ROHM Co., Ltd. All rights reserved.
www.rohm.com
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)
16. Applications or inspection processes where the potential of the Vcc pin or other pins may be reversed from their normal
It is necessary to place capacitors between each output pin and GND to prevent oscillation on the output. Usable
capacitance values range from 2.2µF 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.
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.
state may cause damage to the IC's internal circuitry or elements. Use an output pin capacitance of 1000µF or lower in
case Vcc is shorted with the GND pin while the external capacitor is charged. Insert a diode in series with Vcc to prevent
reverse current flow, or insert bypass diodes between Vcc and each pin.
0.001
Cout_ESR vs Io(reference data)
0.01
100
0.1
10
1
Vcc ＝ 4V ～ 25V
Ta ＝ -40 ℃～ +105 ℃
R1 ＝ 5k Ω～ 10k Ω
Cin ＝ 2.2µF ～ 100µF Cout ＝ 2.2µF ～ 100µF
0
(4～25V)
Vcc
400
Unstable operating region
Stable operating region
800
Io(mA)
Vo ＝ 3V ～ 15V
(2.2µF～)
Cin
1200
※Operation Notes 10 Measurement circuit
1600
V
(5V)
CTL
2000
CTL
Vcc
GND
9/11
ADJ
Vo
100
10
1
1
Vcc ＝ 4V ～ 25V
Ta ＝ -40 ℃～ +105 ℃
R1 ＝ 5k Ω～ 10k Ω
Cin vs Cout(reference data)
Cout(2.2µF～)
2.2
R2
(5k～10kΩ)
R1
Stable operating region
ESR
Cout（μF）
(0.001Ω～)
Vo ＝ 3V ～ 15V
10
Io ＝ 0A ～ 2A
Io(ROUT)
100
Technical Note
2011.03 - Rev.A