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参数资料
| 型号： | BD2045AFJ-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH HIGH SIDE 1CH SOP-J8 |
| 特色产品： | High Side Switch Regulators |
| 标准包装： | 1 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 80 毫欧 |
| 电流 - 输出 / 通道： | 250mA |
| 电流 - 峰值输出： | 500mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP-J |
| 包装： | 标准包装 |
| 产品目录页面： | 1371 (CN2011-ZH PDF) |
| 其它名称： | BD2045AFJ-E2DKR |
BD2045AFJ BD2055AFJ
● Typical Application Circuit
5V(typ.)
Datasheet
VBUS
D+
D-
GND
IN
Regulator
OUT
10k to
GND
OUT
VBUS
USB
Controller
100k ?
C IN
IN
IN
OUT
OUT
+
C L -
D+
D-
EN(/EN) /OC
GND
● Application Information
When excessive current flows due to output short-circuit or so, ringing occurs because of inductance between power source
line to IC, and may cause bad influences on IC operations. In order to avoid this case, connect a bypass capacitor across
IN terminal and GND terminal of IC. 1 μ F or higher is recommended.
Pull up /OC output by resistance value of 10k ? to 100k ? .
Set up value which satisfies the application as C L .
This application circuit does not guarantee its operation.
When using the circuit with changes to the external circuit constants, make sure to leave an adequate margin for external
components including AC/DC characteristics as well as dispersion of the IC.
● Functional Description
1. Switch operation
IN terminal and OUT terminal are connected to the drain and the source of switch MOSFET respectively. The IN terminal
is used also as power source input to the internal control circuit.
When the switch is turned on from EN/EN control input, the IN terminal and OUT terminal are connected by an 80m ?
switch. In ON status, the switch is bidirectional. Therefore, when the potential of OUT terminal is higher than that of the IN
terminal, current flows from OUT terminal to IN terminal.
Since a parasitic diode between the drain and the source of switch MOSFET is not present in the off status, it is possible
to prevent current from flowing reversely from OUT to IN.
2. Thermal shutdown circuit (TSD)
If over current would continue, the temperature of the IC would increase drastically. If the junction temperature were
beyond 140°C (typ.) in the condition of over current detection, thermal shutdown circuit operates and makes power switch
turn off and outputs error flag (/OC). Then, when the junction temperature decreases lower than 120°C (typ.), power
switch is turned on and error flag (/OC) is cancelled. Unless the increasing of the chip’s temperature is removed or the
output of power switch is turned off, this operation repeats.
The thermal shutdown circuit operates when the switch is on (EN,/EN signal is active).
3. Over current detection (OCD)
The over current detection circuit limits current (I SC ) and outputs an error flag (/OC) when current flowing in each switch
MOSFET exceeds a specified value. There are three types of response against over current. The over current detection
circuit works when the switch is on (EN,/EN signal is active).
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
15/22
TSZ02201-0E3E0H300130-1-2
11.Mar.2013 Rev.001
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