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FP6711 Datasheet(PDF) 10 Page - Fitipower Integrated Technology Inc.

Part # FP6711
Description  High-Efficiency, 1-Cell and 2-Cell Boost Converter
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Manufacturer  FITIPOWER [Fitipower Integrated Technology Inc.]
Direct Link  http://www.fitipower.com/en_US/index.asp
Logo FITIPOWER - Fitipower Integrated Technology Inc.

FP6711 Datasheet(HTML) 10 Page - Fitipower Integrated Technology Inc.

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10
FP6711-1.4-DEC-2011
FP6711
85T
fitipower integrated technology lnc.
Application Information (Continued)
Auto-Discharge
The
auto-discharge
function
is
useful
for
applications where the supply voltage of a µC, µP,
or memory has to be removed during shutdown in
order to ensure a defined state of the system.
The auto-discharge function will be enabled when
the ADEN is set high; and it will be disabled when
the
ADEN
is
set
to
GND.
When
the
auto-discharge function is enabled, the output
capacitor will be discharged after the device is shut
down by setting EN to GND.
The capacitors
connected to the output are discharged by an
integrated switch
of 300Ω, hence the discharge
time depends on the total output capacitance.
The
residual voltage on VOUT is less than 0.4V after
auto-discharge.
The resistive divider scales down the battery
voltage to a voltage level of 500mV, which is then
compared to the LBI threshold voltage.
The LBI
pin has a built-in hysteresis of 10mV.
See the
application section for more details about the
programming of the LBI threshold.
If the low-battery detection circuit is not used, the
LBI pin should be connected to GND (or to VBAT)
and the LBO pin can be left unconnected.
Do not
let the LBI pin float.
Low-Battery Detector Circuit (LBI and LBO)
The low-battery detector circuit is typically used to
supervise the battery voltage and generate an error
flag when the battery voltage drops below user-set
threshold voltage.
The function is active only
when the device is enabled.
When the device is
disabled, the LBO pin will be high impedance.
The
LBO pin goes active low when the voltage on the
LBI pin decreases below the set threshold voltage
of 500 mV ±15 mV, which is equal to the internal
reference voltage.
The battery voltage, at the
detection circuit switches, can be programmed with
a resistive divider connected to the LBI pin.
Anti-Ringing Switch
The device integrates a circuit which removes the
ringing that typically appears on the SW node when
the converter enters the discontinuous current
mode.
In this case, the current through the
inductor ramps to zero and the integrated PMOS
switch turns off to prevent a reverse current from
the output capacitors back to the battery.
Due to
remaining
energy
that
is
stored
in
parasitic
components
of
the
semiconductors
and
the
inductor, a ringing on the SW pin is induced.
The
integrated anti-ringing switch clamps this voltage
internally to VBAT; therefore, dampens this ringing.
Adjustable Output Voltage
The accuracy of the output voltage is determined by
the accuracy of the internal voltage reference, the
controller topology, and the accuracy of the external
resistor.
The reference voltage has an accuracy of
± 4%.
The controller switches between fixed
frequency and PFM mode, depending on load
current.
The tolerance of the resistors in the
feedback
divider determines the total system
accuracy.
Design Procedure
The FP6711 boost converter family is intended for
systems that are powered by a single-cell NiCd or
NiMH battery with a typical terminal voltage
between 0.9V to 1.6V.
It can also be used in
systems that are powered by two-cell NiCd or NiMH
batteries with a typical stack voltage between 1.8V
to 3.2V.
Additionally, single or dual-cell, primary
and secondary alkaline battery cells can be the
power source in systems where the FP6711 is used.
(1) Programming the Output Voltage
The output voltage of the FP6711 can be
adjusted with an external resistor divider.
The
typical value of the voltage on the FB pin is
500mV in fixed frequency operation.
The
maximum allowed value for the output voltage is
3.3V.
The current through the resistive divider
should be about 100 times greater than the
current into the FB pin.
The typical current into
the FB pin is 0.01µA, and the voltage across R4
is typically 500mV.
Based on those two values,
the recommended value for R4 is in the range of
500kΩ in order to set the divider current at 1µA.
From that, the value of resistor R3, depending on
the
needed
output
voltage
(VO), can be
calculated using Equation 1.
1)
-
mV
500
V
(
500k
)
1
-
V
V
(
R4
R3
O
FB
O
.....(1)


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