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ILC6383CIR33X Datasheet(Hoja de datos) 8 Page - Fairchild Semiconductor

No. de Pieza. ILC6383CIR33X
Descripción  1-Cell to 3-Cell Boost DC-DC Converter with True Load Disconnect, 3.3V, 5V or Adjustable Output
Descarga  15 Pages
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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 8 page
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ILC6383
PRODUCT SPECIFICATION
8
REV. 1.2.6 6/13/02
Shut Down
The LBI pin is shared with the shutdown pin. A low voltage
(<0.4V) will put the ILC6383 into a power down state. The
simplest way to implement this is with an FET across R6 as
shown in Figure 8. Note that when the device is not in PWM
mode or is in shutdown the low battery detector does not
operate.
When the ILC6383 is shut down, the synchronous rectifier
disconnects the output from the input. This ensures that there
is only leakage (IIN < 1µA typical) from the input to the out-
put so that the battery is not drained when the ILC6383 is
shut down.
Figure 8. Shut Down Control
Power Good Output (POK)
The POK output of the ILC6383 indicates when VOUT is
within the regulation tolerance of the set output voltage.
POK output is an open drain device output capable of sink-
ing 2mA. It will remain pulled low until the output voltage
has risen to typically 95% of the specified VOUT. Note that a
pull-up resistor must be connected from the POK output (pin
5 of ILC6383CIR-XX) to either ILC6383’s output or to
some other system voltage source.
Adjustable Output Voltage Selection
The ILC6383-ADJ allows the output voltage to be set using
a potential divider. The formula for setting the adjustable
output voltage is;
VOUT = VFB x (1+R1/R2), R1+R2
≤ 100KΩ
where VFB is the threshold set which is 1.25V nominal.
Figure 9. Adjustable Voltage Configuration
Negative Voltage Output
It is possible to generate a negative output voltage as a sec-
ondary supply using the ILC6383. This negative voltage may
be useful in some applications where a negative bias voltage
at low current is required.
Figure 10. Negative Output Voltage
ON/OFF
R5
R6
LBI/SD
3
ILC6383
2 VIN
7 GND
47
µF
ON
OFF
VIN
1 to 3-cell
R5
R6
15
µH
L
47
µF
COUT
R1
R2
ILC6383-ADJ
MSOP-8
LX
VIN
LBI/SD
SEL
GND
LBO
VFB
VOUT
VOUT
VOUT = 1.25 (1+R1/R2)
1
2
3
4
8
7
6
5
CIN
+
PWM
PFM
1
2
L
LX
VIN
VIN
ILC6383
0.01
µF
0.01
µF
-V
1A Schottky Diodes




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