AIC1652 Datasheet, PDF (1/6 Pages) Analog Intergrations Corporation – MICROPOWER INVERTING DC/DC CONVERTER

n ^FEATURES
l 2.4V to 7V Input Voltage Operation.
l Adjustable Output Voltage up to -40V.
l Low Quiescent Current at 80µA.
l Pulse Frequency Modulation Maintains High
Efficiency (87%).
l 70KHz to 160KHz Switching Frequency.
l Power-Saving Shutdown Mode (0.7µA Typical).
l High Efficiency with Low Cost External PNP
Bipolar Transistor.
n ^APPLICATIONS
l Negative LCD Contrast Bias for
1. Notebook & Palmtop Computers.
2. Pen-Based Data System.
3. Portable Data Collection Terminals.
4. Personal Digital Assistants.
l Negative Voltage Supply.
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n ^DESCRIPTION
The AIC1652 is a high performance inverting
DC/DC converter, designed to drive an external
power switch to generate programmable negative
voltages. In the particularly suitable LCD bias con-
trast application, efficiency of 87% can be
achieved with low cost PNP bipolar transistor driv-
ers. Output voltage can be scaled to -40V or
greater by two external resistors. A pulse frequen-
cy modulation scheme is employed to maintain
high efficiency conversion under wide input voltage
range. Quiescent current is about 80µA and can
be reduced to 0.7µA in shutdown mode. Switching
frequency being around 70KHz to 160KHz range,
small size switching components are ideal for bat-
tery powered portable equipments, like notebook
and palmtop computers.
n ^{TYPICAL APPLICATION CIRCUIT}
VIN
2.4V ~ 7V
100µF +
C1
0.047µF
C4
VIN
CL
VREF
DHI
AIC1652
SHDN
DLOW
FB
GND
Q1
9012
RB
D1 1N5819
470~1.8K
150µ H
*L
C2
100µF
+
R2
100K
R1
1M
C3
10nF
* Sumida CD-54 Series
VOUT = -1.22V x R1/R2
Negative LCD Contrast Bias Power Supply
VOUT
-12V~ -40V
-10mA
n ^{ORDERING INFORMATION}
AIC1652 XX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~ +70°C
ORDER NUMBER
AIC1652CN
(PLASTIC DIP)
AIC1652CS
(PLASTIC SO)
PIN CONFIGURATION
TOP VIEW
VIN 1
VREF 2
SHDN 3
FB ₄
8 ^CL
7 ^DHI
6 ^DLOW
5 ^GND
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based IndustrialPark,Hsinchu,Taiwan, R.O.C. TEL: [phone] FAX:[phone]
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