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BA3259HFP Datasheet(PDF) 6 Page - Rohm |
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BA3259HFP Datasheet(HTML) 6 Page - Rohm |
6 / 11 page Technical Note 6/10 www.rohm.com 2011.03 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. BA3259HFP,BA30E00WHFP ● Block Diagrams / Standard Example Application Circuits Fig.25 BA3259HFP Block Diagram Fig.26 BA30E00WHFP Block Diagram Pin No. Pin name Function 1 Vcc Power supply pin 2 ADJ Variable output voltage detection pin 3 GND GND pin 4 Vo2 Variable output pin 5 Vo1 3.3 V output pin FIN GND GND pin Pin No. Pin name Function 1 EN Output on/off control pin: High active 2 Vcc2 Power supply pin 2 3 Vcc1 Power supply pin 1 4 GND GND pin 5 Vo1 Power supply pin for 3.3 V output 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 PIN External capacitor setting range Vcc (1Pin) Approximately 3.3µF Vo1 (5Pin) 1 µF to 1000 µF Vo2 (4Pin) 1 µF to 1000 µF TOP VIEW PIN External capacitor setting range Vcc1 (3Pin) Approximately 1 µF Vcc2 (2Pin) Approximately 1 µF Vo1 (5Pin) 47 µF to 1000 µF Vo2 (6Pin) 47 µF to 1000 µF 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 (0.05µA typ.: BA3259HFP) (0.2µA 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. R1 BA3259HFP: 1 kΩ to 10 kΩ BA30E00HFP: 1 kΩ to 5 kΩ The above is recommended. 1 2 3 4 5 6 7 Vo2 ADJ IADJ VADJ R2 R1 1 2 3 4 5 VREF Current Limit Thermal Shutdown Current Limit VO1 VO2 GND 3.3V 1μF 1.5V 1μF 3.3μF VIN CO1 CO2 CIN 1 5 4 FIN 2 ADJ Vcc R1 R2 3 GND 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 |
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