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參數(shù)資料
| 型號(hào)： | FAN5602MP5X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, GREEN, MO-229VEEC, MLP-8 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 616K |
| 代理商： | FAN5602MP5X |
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12
REV. 1.1 10/7/04
FAN5602
PRODUCT SPECIFICATION
When 2 x V
IN
> V
OUT
> 1.5 x V
IN
, 1:2 mode (step-up)
shown in Fig. 1(c) 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 voltage is placed to
the bottom 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 2Vin
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
, 1:3 mode (step-up) shown
in Fig. 1(d) 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 con-
nected 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 and 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 understood by
reversing the function of V
IN
and V
OUT
in the above discus-
sion.
The reason for built-in so many modes is to improve power
efficiency and to 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.
Light Load Operation
The power transistors used in the charge pump are very large
in size. The dynamic loss from the switching the power tran-
sistors is not small and increases its proportion 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-skipping 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 out-
put 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. Then shut off the oscillator, shut off
power transistors and deliver 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 in the FAN5602 is designed as
a 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.
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 keeps on as long as the V
OUT
< 150mV. Since this
transistor is very small, the current from the input to the out-
put is limited. Once the short at the output is eliminated, this
transistor is large enough to charge the output higher than
150mV and then the FAN5607 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 reference volt-
age during the startup. Since the ramp starts at zero and goes
up slowly, the output follows the ramp and therefore 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 will go to thermal shutdown if the junction
temperature is over 150C with 15C hysteresis.
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