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BA3259HFP 데이터시트(PDF) 5 Page - Rohm

부품명 BA3259HFP
상세설명  Dual-output Secondary Fixed/Variable Output LDO Regulators for Local Power Supplies
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BA3259HFP,BA30E00WHFP
Technical Note
5/9
www.rohm.com
2009.04 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
VREF
Current
Limit
Thermal
Shutdown
Current
Limit
V
O1
V
O2
GND
3.3V
1μF
1.5V
1μF
3.3μF
V
IN
C
O1
C
O2
C
IN
1
5
4
FIN
2
ADJ
Vcc
R1
R2
3
GND
Block Diagrams / Standard Example Application Circuits
Fig.25 BA3259HFP Block Diagram
Fig.26 BA30E00WHFP Block Diagram
Pin No.
Pin name
Function
Pin No.
Pin name
Function
1
Vcc
Power supply pin
1
EN
Output on/off control pin: High active
2
ADJ
Variable output voltage detection pin
2
Vcc2
Power supply pin 2
3
GND
GND pin
3
Vcc1
Power supply pin 1
4
Vo2
Variable output pin
4
GND
GND pin
5
Vo1
3.3 V output pin
5
Vo1
Power supply pin for 3.3 V output
FIN
GND
GND pin
6
Vo2
Variable output voltage detection pin (0.8 V to 3.3 V)
7
ADJ
Variable output voltage detection pin
FIN
GND
GND pin
TOP VIEW
TOP VIEW
HRP5
HRP7
Setting the Output Voltage Vo2
The following output voltage setting method applies to the variable output pin.
Vo2=VADJ
 ( 1 +
R2
) - R2
 IADJ
R1
VADJ: Output feedback reference voltage
(0.8 V typ.)
IADJ: ADJ pin source current
(0.05
A typ.: BA3259HFP)
(0.2
A typ.: BA30E00WHFP)
Note:Connect R1 and R2 to make output voltage settings as shown in Fig.25 and Fig.26. Keep in mind that the offset
voltage caused by the current (IADJ) flowing out of the ADJ pin will become high if higher resistance is used.
Vo2
ADJ
IADJ
VADJ
R2
R1
R1
BA3259HFP: 1 k
 to 10 k
BA30E00HFP: 1 k
 to 5 k
The above is recommended.
EN
Current
Limit
Sat.
Prevention
Current
Limit
Sat.
Prevention
Thermal
Shut Down
GND(Fin)
Vcc1
Vcc1
Vcc2
Vcc2
Vcc1
ADJ
GND
Vo2
Vo1
Vcc2
Reference
Voltage
R1
R2
47μF
47μF
1μF
1μF
1
2
3
4
5
6
7
PIN
External capacitor setting range
Vcc (1Pin)
Approximately 3.3
F
Vo1 (5Pin)
1
F to 1000 F
Vo2 (4Pin)
1
F to 1000 F
PIN
External capacitor setting range
Vcc1 (3Pin)
Approximately 1
F
Vcc2 (2Pin)
Approximately 1
F
Vo1 (5Pin)
47
F to 1000 F
Vo2 (6Pin)
47
F to 1000 F
1
2
3
4
5
1 2 3 4 5 6 7


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