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参数资料
| 型号： | FAN5904UC01X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 17/23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 |
Operating Description
The FAN5904 is a high-efficiency, synchronous, step-
down converter operating with current-mode control. A
wide range of load currents is supported. High-current
applications, up to a DC output of 2.3 A demanded by
GSM/EDGE applications, are allowed. Performance
degradation due to spurs is mitigated by selection of a
3 MHz or 6 MHz switching rate. Moreover, the FAN5904
offers Bypass Mode, where the output is shorted to the
battery input via a low on-state resistance bypass FET.
The output voltage V OUT is regulated to 2.5 times the input
control voltage, V CON , set by an external DAC. The
FAN5904 operates in either PWM or PFM Mode,
depending on the output voltage and load current.
In Pulse Width Modulation (PWM) Mode , regulation
begins with an on-state where a P-channel transistor is
turned on and the inductor current is ramped up until the
off-state begins. In off-state, the P-channel is switched off
and an N-channel transistor is turned on. The inductor
current decreases to maintain an average value equal to
the DC load current. The inductor current is continuously
monitored. A current sense detects when the P-channel
transistor current exceeds the current limit and the
switcher is turned back to off-state to decrease the inductor
current and prevent magnetic saturation. Similarly, the
current sense detects when the N-channel transistor current
exceeds the current limit and redirects discharging current
through the inductor back to the battery.
In Pulse Frequency Modulation (PFM) Mode , at low
load currents, the FAN5904 operates in a constant on-time
mode. During the on-state, the P-channel is turned on for
a specified on-time before switching to off-state, during
which the N-channel switch is enabled until the inductor
Table 1. Mode Definitions
current decreases to 0 A. The switcher output is then put
in high-impedance state until a new regulation cycle starts.
PFM operation is allowed only in Low-Power Mode. At low
load currents, PFM achieves higher efficiencies than
PWM. To allow optimization of system performance, two
versions of the FAN5904 are available. The
FAN5904UC00X enables PFM only when V OUT is less
than approximately 1 V. The FAN5904UC01X allows PFM
to be entered at higher output voltages.
PFM Mode is only enabled for output load currents
nominally less than 100 mA. This realizes high efficiency
down to 10mA load current. This is not supported in High-
Power Mode (MODE = 0) and may be disabled in Low-
Power Mode by tying the SYNC input HIGH.
Low-Power Auto Mode (MODE = 1)
Low-Power Auto Mode is ideal for 3G/3.5G and 4G
applications. Current sense limits are nominally 1.65 Apk
and power levels up to 29 dBm are supported.
High-Power PWM Mode (MODE = 0)
Due to the large current requirements in GSM/EDGE
applications, only PWM Mode is supported when the
FAN5904 is configured for High-Power Mode. Current-
sense limits are increased to allow for large load currents
up to a maximum of approximately 3.3 A.
Bypass Mode
In Bypass Mode , the DC-DC turns into 100% duty cycle
and the bypass FET is turned on, which allows a very low
voltage dropout and up to 3.0 A load current.
Mode
Mode Description
MODE
Conditions
SYNC BPEN
EN
DC-DC in Auto Mode
1 Standby Mode
2 Auto Mode Low Power
Whole IC disabled
(10)
X
1
X
0
X
0
0
1
3 Forced PWM Mode Low Power DC-DC in PWM Mode only
1
1
0
1
4 PWM Mode High Power
5 Bypass Mode
DC-DC in PWM High-Power Mode
Bypass FET and PFET forced to 100% duty-cycle
0
X
0
X
0
1
1
1
Note:
10. When V OUT exceeds the bypass threshold, the bypass FET is enabled and the DC-DC goes to 100% duty cycle. When
V OUT is less than the exit threshold, the bypass FET is disabled and the DC-DC re-enters Auto Mode.
? 2011 Fairchild Semiconductor Corporation
FAN5904 ? Rev. 3.0.7
17
www.fairchildsemi.com
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