AIC1899GG 데이터 시트보기 (PDF) - Analog Intergrations

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AIC1899GG

1.0MHz Current-Mode Step-Up DC/DC Converter

Analog Intergrations 

AIC1899

and larger diode capacitance, which can cause

significant switching losses at the 1.0MHz

switching frequency of AIC1899.

Setting the Output Voltage

The AIC1899 operates with an adjustable output

from Vin to 24V. Connect a resistive voltage

divider from the output to FB (see Fig.1).

Calculate R1 and R2 using the equation:

R1

R2

=



Vo

VFB

− 1

where VFB , the step-up regulator feedback set

point, is 1.23V. Connect the resistive-divider as

close to the IC as possible.

APPLICATION EXAMPLES

L1 22uH

Vin=3V~4.2V

+

Cin

33uF

U1 AIC1899

IN

LX

SHDN FB

SS GND

C2

33nF

D1 SS0540

15V/15mA

R1 11k

Cout +

Co

10uF

0.1uF

R2 CF 1nF

1k

Fig. 14 1-Cell Li-Ion boost converter for OLED Application

8

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