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参数资料
| 型号： | FAN5602MU33X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 3.3V 8MSOP |
| 标准包装： | 4,000 |
| 类型： | 降压（降压），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： | 3.3V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 200mA |
| 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-MLP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MLP（3x3） |
Switch Array Modes
TOP
TOP
C1+
S1A
S1A
C1+
S1A
S2A
C1+
C1
C1
S2A
S3A
MID
S3B
C2
MID
C1-
C1-
S5
S4B
C1-
GND
Figure 21. Mode 1 (1:1)
TOP
GND
Figure 22. Mode 2 (2:3 or 3:2) All Switches Set for
Phase 1 and Reverse State for Phase 2
TOP
C1+
S1A
S1B
C2+
C1+
S1A
C2+
S2A
S2B
C1
S2A
MID
S2B
C2
C1
MID
C2
S3B
S3A
S3B
C1-
S4A
S5
S4B
C2-
C1-
S4A
S4B
C2-
GND
Figure 23. Mode 3 (1:2 or 2:1) All Switches Set for
Phase 1 and Reverse State for Phase 2
Light-Load Operation
The power transistors used in the charge pump are very
large in size. The dynamic loss from the switching the
power transistors is not small and increases its propor-
tion of the total power consumption as the load gets light.
To save power, the FAN5602 switches, when the load is
less than 10mA, from constant frequency to pulse-skip-
ping mode (PFM) for modes 2:3(3:2), 1:2(2:1) and
1:3(3:1), except mode 1:1. In PFM mode, the linear loop
is disabled and the error amplifier is turned off. A PFM
comparator is used to setup an upper threshold and a
lower threshold for the output. When the output is lower
than the lower threshold, the oscillator is turned on and
the charge pump starts working and keeps delivering
charges from the input to the output until the output is
higher than the upper threshold. The oscillator shuts off
power transistors and delivers the charge to the output
from the output capacitor. PFM operation is not used for
Mode 1:1, even if at light load. Mode 1:1 is designed as
an LDO with the oscillator off. The power transistors at
LDO mode are not switching and therefore do not have
the dynamic loss.
Switching from linear operation to PFM mode
(I LOAD <10mA) and from PFM to linear mode
(I LOAD >10mA) is automatic, based on the load current,
which is monitored all the time.
? 2005 Fairchild Semiconductor Corporation
FAN5602 Rev. 1.5.3
10
Figure 24. Mode 4 (1:3 or 3:1) All Switches Set for
Phase 1 and Reverse State for Phase 2
Short Circuit
When the output voltage is lower than 150mV, the
FAN5602 enters short-circuit condition. In this condition,
all power transistors are turned off. A small transistor
shorting the input and the output turns on and charges
the output. This transistor stays on as long as the V OUT
<150mV. Since this transistor is very small, the current
from the input to the output is limited. Once the short at
the output is eliminated, this transistor is large enough to
charge the output higher than 150mV and the FAN5602
enters soft-start period.
Soft Start
The FAN5602 uses a constant current, charging a low-
pass filter to generate a ramp. The ramp is used as refer-
ence voltage during the startup. Since the ramp starts at
zero and goes up slowly, the output follows the ramp and
inrush current is restricted. When the ramp is higher than
bandgap voltage, the bandgap voltage supersedes ramp
as reference and the soft start is over. The soft start
takes about 500μs.
Thermal Shutdown
The FAN5602 goes to thermal shutdown if the junction
temperature is over 150°C with 15°C hysteresis.
www.fairchildsemi.com
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