AIC1880 Datasheet, PDF (1/11 Pages) Analog Intergrations Corporation – Low Noise, Step-Up PWM DC/DC Converter

AIC1880
Low Noise, Step-Up PWM DC/DC Converter
FEATURES
90% High Efficiency
1.6A, 0.3Ω, 12V Internal Power MOSFET
640kHz/1.2MHz Pin-Selectable Operation
Frequency
2.6V to 5.5V Input Range
Low Shutdown Current: 0.1µA
Programmable Soft-Start
External Compensation Network
Adjustable Output from V_IN to 11V
Thin 8-Pin MSOP Package
APPLICATIONS
TFT Bias Supplies
Handheld Devices
PCMCIA Cards
Portable Equipment
DESCRIPTION
The AIC1880 is a step-up DC/DC converter with a
1.6A, 0.3Ω internal power switch. A soft-start pro-
grammed with an external capacitor sets the input
current ramp rate. Pin-selectable high switching
frequency (640kHz or 1.2MHz) allows easy filter-
ing and low noises. An external compensation pin
gives users flexibility in setting frequency com-
pensation, which makes it feasible to use the
small, low ESR ceramic output capacitors. The
AIC1880 converts input ranging 2.6V to 5.5V into
output voltage up to 11V. The device is available
in a low profile 8-lead MSOP package.
TYPICAL APPLICATION CIRCUIT
3.3V
Cin
10uF
1.2MHz ^640kHz
ON ^OFF
Ccomp2
20pF
L
6.8uH
U1
6 _VIN
LX ⁵
7 _FREQ
4
GND
3 _SHDN
FB ²
1 _COMP
SS ⁸
Rcomp AIC1880
33k
Ccomp
1200pF
D
SS24
Css
0.022uF
10V
Cout R1
10uF 1.6M
R2
220k
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: [phone], FAX: [phone]
www.analog.com.tw
DS-1880P-02 042507
1