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参数资料
| 型号： | FAN5665UCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SWITCHD CAP 5V 8WLCSP |
| 标准包装： | 1 |
| 类型： | 升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 30mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WLCSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-WLCSP |
| 产品目录页面： | 1215 (CN2011-ZH PDF) |
| 其它名称： | FAN5665UCXDKR |
Block Diagram
Figure 39. Block Diagram
Functional Description
Overview
FAN5665 is a 5V switched capacitor regulator with very
low output ripple and high efficiency. The maximum
output current is 30mA.
Linear Regulation Loop
The linear regulation loop (consisting of the power
transistors, output feedback, and error amplifier), is
used to regulate the output voltage and reduce current
spikes at mode change.
Soft-start
At power-up, the device has 0.5ms soft-start to control
the inrush current and make the output ramp up slowly.
Modes of Operation
FAN5665 has 1×, 1.5×, and 2× modes. Input voltage is
compared with reference to determine mode.
? 2007 Fairchild Semiconductor Corporation
FAN5665 ? Rev. 1.0.1
11
Light / Heavy Load Monitor
In 1.5× / 2× mode, there is a current sense to detect the
output current. If a light-load condition is detected, the
device switches to a lower switching frequency around
50kHz. This frequency is a good compromise between
achieving high light-load efficiency and not causing
audible noise generation. If the load is heavy (typically
more than 5mA), the device switches at 1.2MHz to
decrease the output voltage ripple.
Protection
FAN5665 has thermal shutdown protection when the
die temperature is more than 150°C. It turns back off
when the temperature falls by about 10°C.
Short-circuit protection helps avoid damage to the
device when the output is shorted to ground. Whenever
output voltage is pulled below 150mV, short-circuit
protection is triggered and limits the input current. If
V OUT >150mV, protection is in the form of thermal
shutdown if die temperature exceeds 150°C.
www.fairchildsemi.com
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