参数资料
| 型号： | BD6522F-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 21/31页 |
| 文件大小： | 0K |
| 描述： | IC PWR MANAGEMENT SWITCH SOP8 TR |
| 标准包装： | 2,500 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 70 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 2.0A |
| 输入电压： | 3 V ~ 5.5 V |
| 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) |
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BD6520F
BD6522F
Datasheet
● Functional Description
1. Switch operation
VDD pin and OUT pin are connected to the drain and source of switch MOSFET respectively. VDD also serves as the
power source input to internal control circuit.
When CTRL input is set to High level and the switch is turned on, VDD and OUT is connected by a 50m ? switch. In a
normal condition, current flows from VDD to OUT. If voltage of OUT is higher than VDD, current flows from OUT to VDD,
since the switch is bidirectional.
In BD6520F, there is a parasitic diode between the drain and the source of switch MOSFET. Therefore, even when the
switch is off and the voltage of OUT is higher than that of VDD, current will flow from OUT to VDD. In BD6522F, there is
no parasitic diode and it is possible to prevent current from flowing reversely from OUT to VDD.
2. Thermal shutdown
Thermal shut down circuit turns off the switch of the circuit when the junction temperature exceeds 135 ℃ (Typ.).
The switch off status of the thermal shut down is latched. Therefore, even when the junction temperature goes down, off
status is maintained. To release the latch, it is necessary to input a signal to switch off by CTRL terminal or set UVLO
state. When the input signal is switched on or UVLO is released, the switch output resets.
The thermal shut down circuit works when CTRL signal is active.
3. Low voltage malfunction prevention circuit (UVLO)
Other term for Under Voltage Lockout Circuit, the UVLO circuit monitors the voltage of the VDD pin when the CTRL input
is active. UVLO circuit prevents the switch from turning on until the VDD exceeds 2.5V (Typ.). If the VDD drops below
2.3V (Typ.) while the switch turns on, then UVLO shuts off the switch.
4. Soft start control
In BD6520F/BD6522F, soft start is applied in order to reduce inrush current at switch on. Furthermore, in order to reduce
inrush current, soft start control pin (SSCTL) is made available.
By connecting external capacitor between SSCTL and GND, it is possible to make rise time for the switch smooth.
When the switch is enabled, SSCTL outputs a voltage of about 13.5V.
SSCTL terminal requires high impedance, therefore, proper packaging should be observed to avoid leak current. When a
certain value of voltage is supplied to SSCTL terminal, switch on and/or off is disabled.
5. Discharge circuit
When the switch between VDD and OUT is OFF, the 350 ? (Typ.) discharge switch resistance between OUT and GND
turns on. By turning on this switch, electric current at capacitive load is discharged.
In BD6522F, the input of discharge circuit is separately prepared as DISC pin. When discharge circuit is used, simply
connect OUT pin and DISC pin to ensure proper operation.
● Timing diagram
V DD
V CTRL
V OUT
Discharge circuit
ON
OFF
ON
Figure 63. Normal operation
V DD
V CTRL
V OUT
V UVLOL
V UVLOH
Discharge circuit
ON
OFF
Figure 64. UVLO operation
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
21/28
TSZ02201-0E3E0H300250-1-2
11.Mar.2013 Rev.001
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