参数资料
| 型号： | BD3506F-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 2.5A 8SOIC |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.65 V ~ 2.5 V |
| 输入电压： | 1.2 V ~ 4.5 V |
| 电压 - 压降（标准）： | 0.12V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 2.5A（最小） |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 带卷 (TR) |
BD3506F,BD3506EFV
● Recommended Circuits
R2
Technical Note
VOUT(1.2V)/2.5A
1
8
C3
+
Ven
C2
2
7
VIN
R1
3
6
C4
Vcc
C1
4
5
Part No
R1/R2
C3
C1
C2
C4
Value
6.5k/5.5k
100μF
0.1μF
10μF
1μF
Notes for use
The present IC can set output voltage by external reference voltage (VR) and value of output voltage
setting resistors (R1, R2). Output voltage can be set by VRxR2/(R1+R2) but it is recommended to
use at the resistance value (total: about 10 k ? ) which is not susceptible to VREF bias current (±100
nA).
Connect the output capacitor between Vo1, Vo2 terminals and GND terminal without fail in order to
stabilize output voltage. The output capacitor has a role to compensate for the phase of loop gain
and to reduce output voltage fluctuation when load is rapidly changed. When there is an
insufficient capacity value, there is a possibility to cause oscillation, and when the equivalent serial
resistance (ESR) of the capacitors is large, output voltage fluctuation is increased when load is
rapidly changed. About 100-μF high-performance electrolytic capacitors are recommended but
output capacitor greatly depends on temperature and load conditions. In addition, when only
ceramic capacitors with low ESR are used, or various capacitors are connected in series, the total
phase allowance of loop gain becomes not sufficient, and oscillation may result. Thoroughgoing
confirmation at application temperature and under load range conditions is requested.
The input capacitor plays a part to lower output impedance of a power supply connected to input
terminals (Vcc). When output impedance of this power supply increases, the input voltages (Vcc,)
become unstable and there is a possibility of giving rise to oscillation and degraded ripple rejection
characteristics. The use of capacitors of about 0.1 μF with low ESR, which provide less capacity
value changes caused by temperature changes, is recommended, but since input capacitor greatly
depends on characteristics of the power supply used for input, substrate wiring pattern,
thoroughgoing confirmation under the application temperature and load range, is requested.
The input capacitor plays a part to lower output impedance of a power supply connected to input
terminals (VIN). When output impedance of this power supply increases, the input voltages (VIN)
become unstable and there is a possibility of giving rise to oscillation and degraded ripple rejection
characteristics. The use of capacitors of about 10 μF with low ESR, which provide less capacity
value changes caused by temperature changes, is recommended, but since input capacitor greatly
depends on characteristics of the power supply used for input, substrate wiring pattern,
thoroughgoing confirmation under the application temperature and load range, is requested.
To the present IC, there mounted is a function (Non Rush Current on Start-up: NRCS) to prevent
rush current from VIN to load and output capacitor via Vo at the output voltage start-up. When the
EN terminal is reset from High or UVLO, constant current is allowed to flow from the NRCS terminal.
By this current, voltage generated at the NRCS terminal becomes the reference voltage and output
voltage is started. In order to stabilize the NRCS set time, it is recommended to use a capacitor (B
special) with less capacity value change caused by temperature change.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
10/14
2010.05 - Rev.A
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