AIC AIC1652CS, AIC1652 Datasheet
AIC1652
AIC1652
CL
DHI
DLOW
0.047µF
9012RB470~1.8K
R1
1MC2C1
-10mA
100µF
R2
100K
ORDER NUMBER
PIN CONFIGURATION
1
8
CL
SHDN
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
FEATURES
n
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.
APPLICATIONS
n
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.
TYPICAL APPLICATION CIRCUIT
n
+
VIN
VREF
SHDN
FB
GND
Q1
150µH
*L
V
IN
2.4V ~ 7V
D1 1N5819
100µF
DESCRIPTION
n
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 contrast application, efficiency of 87% can be
achieved with low cost PNP bipolar transistor drivers. 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 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 battery powered portable equipments, like notebook
and palmtop computers.
VOUT
-12V~ -40V
+
C4
C3
10nF
* Sumida CD-54 Series
V
= -1.22V x R1/R2
OUT
Negative LCD Contrast Bias Power Supply
ORDERING INFORMATION
n
AIC1652 XX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~ +70°C
AIC1652CN
(PLASTIC DIP)
AIC1652CS
(PLASTIC SO)
TOP VIEW
VIN
VREF
FB
2
3
4
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
7
6
5
DHI
DLOW
GND
1
AIC1652
SHDN
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
ABSOLUTE MAXIMUM RATINGS
n
Supply Voltage ..................................................................…………………............ 7V
Voltage ...............................................……………..................................... 7V
Operation Temperature Range ................................……….......................... 0°C~70°C
Storage Temperature Range .................................…………................. -65
TEST CIRCUIT
n
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS (V
n
=5V, Ta=25°C, unless otherwise spec ified.)
IN
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Voltage
Switch Off Current VFB=-50mV
V
Voltage I
REF
V
Source Current
REF
DLOW “ON Resistance”
DHI “ON Resistance”
SOURCE
= 250µA
2.4 7
1.16 1.22 1.28
250
°
C~ 150°C
80 150
5
7
V
µA
V
µA
Ω
Ω
CL Threshold
Shutdown Threshold
Shutdown Mode Current
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
V 0VSHDN =
0.8 1.5 2.4
70
0.7 2
mV
V
µA
2
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