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参数资料
| 型号： | FAN5904UC01X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | IC CONV BUCK W/BYPASS 16-WLCSP |
| 标准包装： | 1 |
| 应用： | 转换器，3G，3.5G，4G RF 功率放大器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFBGA，WLCSP |
| 供应商设备封装： | 16-WLCSP |
| 包装： | 标准包装 |
| 其它名称： | FAN5904UC01XFSDKR |
Δ V OUT Positive Step
After a V CON positive step, the FAN5904 goes into a current
limit mode, where V OUT ramps with a constant slew rate
dictated by the output capacitor and the current limit I LIMp
Δ V OUT Negative Step
After a V CON negative step, the FAN5904 enters a current
limit mode where V OUT is reduced with a constant slew rate
dictated by the output capacitor and the current limit I LIMn .
V OUT Transition to or from Bypass Mode
The transition to or from Bypass Mode requires that the
bypass conditions be met. The FAN5904 performs detection
of the bypass conditions 2 μs after V CON transition and
enables the required charging / discharging circuit to realize
a transition time of 20 μs.
V OUT Transition at Startup
Application Information
Figure 56 illustrates an application of the FAN5904 in a
GSM/EDGE/WCDMA transmitter configuration. The
FAN5904 is ideal for driving multiple GSM/EDGE and
3G/3.5G and 4G PAs. Figure 57 presents a timing diagram
At startup, after EN rising edge is detected, the system
requires 25 μs to allow all internal voltage references and
amplifiers to start before enabling the DC-DC function.
V OUT Transition after BPEN
When BPEN goes HIGH, the controller dismisses the
internal bypass flags and sensors and enables Bypass
Mode. However, the transition is managed with the same
current limits and slew rate used during regular transitions.
Thermal Protection
When the junction temperature exceeds the maximum
specified junction temperature, the FAN5904 enters Power-
Down Mode (except the thermal detection circuit).
designed to support voltage transients of 10 μs when
configured for GSM/EDGE applications (MODE = 0) and
driving a load capacitance of approximately 10 μF. Figure 58
shows a timing diagram for WCDMA applications.
designed to meet GSM specifications. The FAN5904 is
Figure 56. Typical Application Diagram with GSM/EDGE/WCDMA Transmitters
? 2011 Fairchild Semiconductor Corporation
FAN5904 ? Rev. 3.0.7
19
www.fairchildsemi.com
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