参数资料
| 型号： | BA3259HFP-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/ADJ 1A HRP7 |
| 标准包装： | 2,000 |
| 稳压器拓扑结构： | 正，固定式和可调式 |
| 输出电压： | 3.3V，0.8 V ~ 3.3 V |
| 输入电压： | 4.75 V ~ 14 V |
| 电压 - 压降（标准）： | 1.1V @ 1A |
| 稳压器数量： | 2 |
| 电流 - 输出： | 1A（最小值） |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | HRP7 |
| 包装： | 带卷 (TR) |
BA3259HFP
BA30E00WHFP
Datasheet
Application Information
● Setting the Output Voltage Vo2
The following output voltage setting method applies to the variable output pin.
Vo2=V ADJ × ( 1 +
R2
R1
) - R2 × I ADJ
V ADJ : Output feedback reference voltage (0.8 V typ.)
I ADJ : ADJ pin source current (0.05μA typ.: BA3259HFP)
(0.2μA typ.: BA30E00WHFP)
Vo2
R1
ADJ
I ADJ
R2
V ADJ
BA3259HFP: 1 k Ω to 10 k Ω
BA30E00HFP: 1 k Ω to 5 k Ω
The above is recommended.
R1
Note:Connect R1 and R2 to make output voltage settings as shown in Fig.1and Fig.2. Keep in mind that the offset
voltage caused by the current (I ADJ ) flowing out of the ADJ pin will become high if higher resistance is used.
● Function Explanation
1) Two-input power supply (BA30E00WHFP)
The input voltages (Vcc1 and Vcc2) supply power to two outputs (Vo1 and Vo2, respectively). The power dissipation
between the input and output pins can be suppressed for each output according to usage.
Efficiency comparison:
5V single input vs. 5V/3V two inputs
? Regulator with single input and two outputs
? Regulator with two inputs and two outputs
(Vo2=1.8V, Io1=Io2=0.3A)
Conventional
Power loss between input and output
Current
Power loss between input and output
5V
Vcc
REG1
Vo1
3.3 V/0.3 A
(Vcc ? Vo1) × Io1 + (Vcc ? Vo2) × Io2
= (5 ? 3.3) × 0.3 + (5 ? 1.8) × 0.3
= 0.51W + 0.96W
5V
Vcc
REG1
Vo1
3.3 V/0.3 A
(Vcc1 ? Vo1) × Io1 + (Vcc2 ? Vo2) × Io2
= (5 ? 3.3) × 0.3 + (5 ? 1.8) × 0.3
= 0.51W + 0.36W
= 1.47W
= 0.87W Reduced power loss by
REG2
Vo2
1.8 V/0.3 A
→ Single 5V input results in decreased
efficiency
3V
REG2
Vo2
1.8 V/0.3 A
0.6W.
→ Additional 3V input improves efficiency
2) Standby function (BA30E00WHFP)
The standby function is operated through the EN pin. Output is turned on at 2.0 V or higher and turned off at 0.8 V or
lower.
● Power Dissipation
If the IC is used under the conditions of excess of the power dissipation, the chip temperature will rise, which will have an
adverse effect on the electrical characteristics of the IC, such as a reduction in current capability. Furthermore, if the
temperature exceeds T jmax , element deterioration or damage may occur. Implement proper thermal designs to ensure that
the power dissipation is within the permissible range in order to prevent instantaneous IC damage resulting from heat and
maintain the reliability of the IC for long-term operation. Refer to the power derating characteristics curves in Fig.27.
? Power Consumption Pc (W) Calculation Method:
○ BA3259HFP
? Power consumption of 3.3 V power
○ BA30E00WHFP
? Power consumption of power transistor on
Vcc
I P
Vcc
transistor
Pc1=(Vcc ? 3.3) × Io1
? Power consumption of Vo2 power
Vcc1
Vo1 (3.3 V output)
Pc1=(Vcc1 ? Vo1) × Io1
? Power consumption of power transistor on
Controller
Icc
Power
Tr
Vcc
Power
Tr
Vo1
Vo2
3.3 V
output
Io1
0.8 V to
3.3 V
output
Io2
transistor
Pc2=(Vcc ? Vo2) × Io2
? Power consumption by circuit current
Pc3=Vcc × Icc
Pc=Pc1 + Pc2 + Pc3
* Vcc: Applied voltage
Io1: Load current on Vo1 side
Io2: Load current on Vo2 side
Vcc1
Vcc2
I B 1
Controller
I B 2
Icc1+Icc2
Power
Tr
Vcc2
Power
Tr
3.3 V
output
Io1
Io1
0.8 V to
3.3 V
Io2 output
Io2
Vo2 (variable output )
Pc2=(Vcc2 ? Vo2) × Io2
? Power consumption by circuit current
Pc3=Vcc1 × Icc1 + Vcc2 × Icc2
Pc=Pc1 + Pc2 + Pc3
* Vcc1, Vcc2: Applied voltage
Io1: Load current on 3.3 V output side
Io2: Load current on variable output side
GND
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
Icc: Circuit current
11/16
GND
Icc1, Icc2: Circuit currents
TSZ02201-0R6R0A600100-1-2
26.Jun.2012 Rev.001
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