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参数资料
| 型号： | FAN5903UCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV BUCK W/BYPASS 9-WLCSP |
| 标准包装： | 3,000 |
| 应用： | 转换器，3G 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： | 9-UFBGA，WLCSP |
| 供应商设备封装： | * |
| 包装： | 带卷 (TR) |
Table 1. Mode Descriptions
#
Mode
Mode Description
Conditions
FSEL BPEN EN VCON
1 Shutdown Mode
2 Sleep Mode
3 6 MHz Auto Mode
4 3 MHz Auto Mode
5 Bypass Mode
The whole IC is disabled.
The DC-DC is in Sleep Mode and consumes less than
70 μA of current.
The DC-DC is in Auto Mode and switches at 6 MHz. (6,7)
The DC-DC is in Auto Mode and switches at 3 MHz.
The bypass FET is forced ON. The DC-DC is set to 100%
duty cycle.
X
X
0
1
X
X
X
0
0
1
0
1
1
1
1
0
0
1
1
1
Notes:
6.
7.
When V OUT exceeds V IN – 200 mV, the bypass FET is enabled and the DC-DC goes to 100% duty cycle. When
V OUT ≤ V IN – 375 mV, the bypass FET is disabled and the DC-DC goes to Auto Mode.
When the load current is smaller than PFM current threshold, the DC-DC changes to PFM Mode.
DC Output Voltage
The output voltage of the DC-DC is determined by V CON,
provided by an external DAC or voltage reference:
Bypass Mode
The trigger to enter Bypass Mode is based on the
voltage difference between the battery voltage (sensed
V OUT ? 2 . 5 ? V CON
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
(1)
through the PVIN pin) and the internally generated
reference voltage, V REF , as depicted in Figure 36. The
DC-DC enters Bypass Mode when V IN = V OUT + 200 mV.
It then turns into 100% duty cycle and the low-R DSON
bypass FET is turned on. As V OUT approaches V IN ; the
DC-DC operates in a constant off-time mode, the
frequency is decreased to achieve a high duty cycle,
and the system continues to run in a regulated mode
until the bypass condition is satisfied.
As noted above, Bypass Mode is also entered when
V CON exceeds 1.5 V.
1.0
0.5
Sleep Mode
DCDC Mode
Bypass Mode
PVIN
FB
0.0
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
250mV
-
+
Bypass Slew
Controller
V CON (V)
VCON
+
V REF
-
Figure 35. Output Voltage vs. Control Voltage
V REF
PWM
Controller
DC-DC
Switcher
SW
L1
The DC-DC is able to provide a regulated V OUT only if
V CON is between 0.16 V to 1.40 V. This allows V OUT to
be adjusted between 0.40 V and 3.50 V. If V CON is below
this range, V OUT is clamped to 0.40 V as minimum and
enters bypass for V CON > 1.50 V. If V CON is less than
50 mV, FAN5903 enters a non-regulated Sleep Mode.
This reduces current consumption to less than 70 μA
while allowing for a rapid return to regulation.
V REF ranges from 0.4 V to 3. 4V
when V IN is higher than 3. 4V
Figure 36. Enabling Bypass Transistor Circuit
The bypass FET is turned on progressively using a slew
rate controller to limit the inrush current. The inrush
current is expressed as a function of the specified slew
rate as follows:
FAN5903 automatically switches between PFM, PWM,
and Bypass Modes.
I INRUSH ? C OUT
? V OUT
? t
? C OUT ? V BP_SLEW
(2)
The DC-DC is able to provide a regulated V OUT only if
the battery voltage is 200 mV greater than V OUT .
? 2008 Fairchild Semiconductor Corporation
FAN5903 ? Rev. 1.0.9
13
The slew rate controller is not used when releasing the
Bypass Mode.
www.fairchildsemi.com
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