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参数资料
| 型号： | FAN5602MP45X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 4.5V 8MLP |
| 标准包装： | 1 |
| 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： | 4.5V |
| 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： | 标准包装 |
| 供应商设备封装： | 8-MLP（3x3） |
| 其它名称： | FAN5602MP45XDKR |
Functional Description
FAN5602 is a high-efficiency, low-noise switched capaci-
tor DC/DC converter capable of step-up and step-down
operations. It has seven built-in switch configurations.
Based on the ratio of the input voltage to the output volt-
age, the FAN5602 automatically reconfigures the switch
to achieve the highest efficiency. The regulation of the
output is achieved by a linear regulation loop, which
modulates the on-resistance of the power transistors so
that the amount of charge transferred from the input to
the flying capacitor at each clock cycle is controlled and
is equal to the charge needed by the load. The current
spike is reduced to minimum. At light load, the FAN5602
automatically switches to Pulse Frequency Modulation
(PFM) mode to save power. The regulation at PFM mode
is achieved by skipping pulses.
Linear Regulation Loop
The FAN5602 operates at constant frequency at load
higher than 10mA. The linear regulation loop consisting
of power transistors, feedback (resistor divider), and
error amplifier is used to realize the regulation of the out-
put voltage and to reduce the current spike. The error
amplifier takes feedback and reference as inputs and
generates the error voltage signal. The error voltage sig-
nal is then used as the gate voltage of the power transis-
tor and modulates the on-resistance of the power
transistor and, therefore, the charge transferred from the
input to the output is controlled and the regulation of the
output is realized. Since the charge transfer is controlled,
the FAN5602 has a small ESR spike.
Switch Array
Switch Configurations
The FAN5602 has seven built-in switch configurations,
including 1:1, 3:2, 2:1 and 3:1 for step-down and 2:3, 1:2
and 1:3 for step-up.
When 1.5 x V OUT > V IN > V OUT , the 1:1 mode shown in
Figure 21 is used. In this mode, the internal oscillator is
turned off. The power transistors connecting the input
and the output become pass transistors and their gate
voltages are controlled by the linear regulation loop, the
rest of power transistors are turned off. In this mode, the
FAN5602 operates exactly like a low dropout (LDO) regu-
lator and the ripple of the output is in the micro-volt range.
When 1.5 x V IN > V OUT > V IN , the 2:3 mode (step-up)
shown in Figure 22 is used. In the charging phase, two
flying capacitors are placed in series and each capacitor
is charged to a half of the input voltage. In pumping
phase, the flying capacitors are placed in parallel. The
? 2005 Fairchild Semiconductor Corporation
FAN5602 Rev. 1.5.3
9
input is connected to the bottom the capacitors so that
the top of the capacitors is boosted to a voltage that
equals V IN /2 + V IN , i.e., 3/2 x V IN . By connecting the top
of the capacitors to the output, one can ideally charge
the output to 3/2 x V IN . If 3/2 x V IN is higher than the
needed V OUT , the linear regulation loop adjusts the on-
resistance to drop some voltage. Boosting the voltage of
the top of the capacitors to 3/2 x V IN by connecting V IN
the bottom of the capacitors, boosts the power efficiency
3/2 times. In 2:3 mode, the ideal power efficiency is
V OUT /1.5 x V IN . For example, if V IN = 2V, V OUT = 2 x V IN
= 4V, the ideal power efficiency is 100%.
When 2 x V IN > V OUT > 1.5 x V IN , the 1:2 mode (step-up)
shown in Figure 23 is used. Both in the charging phase
and in pumping phase, two flying capacitors are placed
in parallel. In charging phase, the capacitors are charged
to the input voltage. In the pumping phase, the input volt-
age is placed to the bottom of the capacitors. The top of
the capacitors is boosted to 2 x V IN . By connecting the
top of the capacitors to the output, one can ideally
charge the output to 2 x V IN . Boosting the voltage on the
top of the capacitors to 2V IN boosts the power efficiency
2 times. In 1:2 mode, the ideal power efficiency is V OUT /2
x V IN . For example, V IN = 2V, V OUT = 2 x V IN = 4V, the
ideal power efficiency is 100%.
When 3 x V IN > V OUT > 2 x V IN , the 1:3 mode (step-up)
shown in Figure 24 is used. In charging phase, two flying
capacitors are placed in parallel and each is charged to
V IN . In the pumping phase, the two flying capacitors are
placed in series and the input is connected to the bottom
of the series connected capacitors. The top of the series
connected capacitors is boosted to 3 x V IN . The ideal
power efficiency is boosted 3 times and is equal to V OUT /
3V IN. For example, V IN = 1V, V OUT = 3 x V IN = 3V, the
ideal power efficiency is 100%. By connecting the output
to the top of the series connected capacitors, one can
charge the output to 3 x V IN .
The internal logic in the FAN5602 monitors the input and
the output compares them, and automatically selects the
switch configuration to achieve the highest efficiency.
The step-down modes 3:2, 2:1, and 3:1 can be under-
stood by reversing the function of V IN and V OUT in the
above discussion.
The built-in modes improve power efficiency and extend
the battery life. For example, if V OUT = 5V, mode 1:2
needs a minimum V IN = 2.5V. By built-in 1:3 mode, the
minimum battery voltage is extended to 1.7V.
www.fairchildsemi.com
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