BA3259HFP_09 ROHM [Rohm], BA3259HFP_09 Datasheet - Page 5

• Manufacturer Part Number: BA3259HFP_09
• Description: Dual-output Secondary Fixed/Variable Output LDO Regulators for Local Power Supplies
• Manufacturer: ROHM [Rohm]

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