FP6790 datasheet(2/8 Pages) FITIPOWER

tên linh kiện	FP6790

Giải thích chi tiết về linh kiện	Low-Noise Boost DC-DC Converter

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FP6790-1.5-JAN-2012

FP6790

85T

fitipower integrated technology lnc.

Typical Application Circuit

COMP

GND

FREQ

SHDN

FP6790

VIN

ON/OFF

VIN

VOUT

0.1µF

4.7µH

22µF

0.033µF

200K

680pF

33pF

51K

360K

10µF

0.1µF

22µF

3.3V

10V

250mA

Figure 2. Typical Application Circuit of FP6790

VIN (V)

VOUT (V)

fOSC (kHz)

L (µH)

COUT (µF)

(kΩ)

C4 (pF)

C6 (pF)

IOUT(MAX) (mA)

3.3

640

10 (TDK SLF7045)

33 (Ceramic)

120

1000

250

3.3

1200

4.7 (TDK SLF7045)

33 (Ceramic)

200

680

250

Functional Pin Description

Pin Name

Pin Function

COMP

Compensation Pin for Error Amplifier.

Connect a series RC from COMP to ground.

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.

Switching Pin.

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.

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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