AIC1628 Datasheet, PDF (1/7 Pages) Analog Intergrations Corporation – 3-Cell, High-Efficiency, Step-Up DC/DC Converter

AIC1628
3-Cell, High-Efficiency, Step-Up DC/DC Converter
FEATURES
4V to 24V Input Voltage Operation.
Adjustable Output Voltage.
Low Quiescent Current at 100µA.
Pulse-Skipping and Pulse-Frequency Modulation
Maintain High Efficiency (max. 95%).
90KHz to 250KHz Oscillator Frequency.
Power-Saving Shutdown Mode (8µA Typical).
Push-Pull Driver Output.
APPLICATIONS
Flash Memory Programming Power Supply.
Positive LCD Contrast Bias for Notebook &
Palmtop Computers.
Step-Up DC/DC Converter Module.
Telecom Power Supply.
DESCRIPTION
The AIC1628 is a high performance step-up
DC/DC converter, designed to drive an external
power switch to generate programmable posi-
tive voltages. In the particularly suitable LCD
contrast bias and flash memory programming
power supply applications, typical full-load effi-
ciencies are 85% to 95%. 4V to 24V input op-
eration range allows the AIC1628 to be powered
directly by the battery pack in the most battery-
operated applications for greater efficiency.
Output voltage can be scaled to 40V or greater
by two external resistors. A Pulse-Frequency
Modulation scheme is employed to maintain
high efficiency conversion under wide input
voltage range. Quiescent current is about
100µA and can be reduced to 8µA in shutdown
mode. Switching frequency being around 90KHz
to 250KHz range, small size switching compo-
nents are ideal for battery powered portable
equipments, like notebook and palmtop com-
puters.
TYPICAL APPLICATION CIRCUIT
VIN
C2 ^VREF
SHDN
CL
DHI
DLOW
5V
FB
GND
AIC1628
*Fuse
60mΩ
+5V ~ 24V
VIN
+ _C1
95
120µF
**L1
68µH
90
1N5819
D1
Q1
2SK940
C5
220µF
+
C6
0.1µF
+36V
VOUT
>50mA
85
R2
16.5K 0.033µF
R1
470K ^0.01µF
*Buss Fuse MCR-2A
80 ₀
C3
C4
**Sumida CDR105
Color LCD Contrast Bias Supply
V_IN=13V
V_IN=9V
V_IN=18V
V_IN=5V
V_OUT=36V
50
100
150
200
Load Current (mA)
Efficiency vs. Output Current
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1628-00
TEL: [phone] FAX: [phone]
www.analog.com.tw
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