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FP6790 Datasheet(PDF) 2 Page - Fitipower Integrated Technology Inc.

Part # FP6790
Description  Low-Noise Boost DC-DC Converter
PDF  8 Pages
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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.

FP6790 Datasheet(HTML) 2 Page - Fitipower Integrated Technology Inc.

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FP6790-1.5-JAN-2012
2
FP6790
85T
fitipower integrated technology lnc.
Typical Application Circuit
FB
COMP
GND
SS
LX
IN
FREQ
SHDN
FP6790
VIN
ON/OFF
VIN
VOUT
1
2
3
5
4
7
8
6
C5
0.1µF
L1
4.7µH
C1
22µF
C3
0.033µF
R3
200K
C4
680pF
C6
33pF
R2
51K
R1
360K
D1
C2
10µF
C7
0.1µF
C8
22µF
3.3V
10V
250mA
Figure 2. Typical Application Circuit of FP6790
VIN (V)
VOUT (V)
fOSC (kHz)
L (µH)
COUT (µF)
R3
(kΩ)
C4 (pF)
C6 (pF)
IOUT(MAX) (mA)
3.3
10
640
10 (TDK SLF7045)
33 (Ceramic)
120
1000
47
250
3.3
10
1200
4.7 (TDK SLF7045)
33 (Ceramic)
200
680
33
250
Functional Pin Description
Pin Name
Pin Function
COMP
Compensation Pin for Error Amplifier.
Connect a series RC from COMP to ground.
FB
Feedback Pin.
The typical reference voltage is 1.24V.
Set VOUT = 1.24V (1+ R1/R2).
See Figure 2.
Enable Pin.
Connect
SHDN low to turn off FP6790.
GND
Ground.
LX
Switching Pin.
IN
Power Input Pin.
FREQ
Frequency Select Pin.
When FREQ connects to ground, the frequency is 640kHz.
When FREQ connects to
VIN, the frequency is 1.2MHz.
SS
Soft-Start Control Pin.
Connect a capacitor (C3) to this pin.
The pin will source 4
μA constant current to charge
the capacitor.
Leave this pin floating to skip soft-start function.



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