AIC AIC1650CS, AIC1650 Datasheet
µ
AIC1650
3-Cell, High-Efficiency, Inverting DC/DC
Converter
FEATURES
4V to 20V Input Voltage Operation.
Adjustable Output Voltage up to -40V.
Low Quiescent Current at 100µA.
Pulse Frequency Modulation Maintains High
Efficiency (max. 90%).
100KHz to 320KHz Switching Frequency.
Power-Saving Shutdown Mode (8µA Typical).
High Efficiency with Low Cost External PNP
Bipolar Transistor.
APPLICATIONS
Negative LCD Contrast Bias for
1. Notebook & Palmtop Computers.
2. Pen-Based Data System.
3. Portable Data Collection Terminals.
4. Personal Digital Assistants.
Negative Voltage Supply.
DESCRIPTION
The AIC1650 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, maximum efficiency of
90% can be achieved with low cost PNP bipolar
transistor drivers. 4V to 20V input operation
range allows the AIC1650 to be powered directly by the battery pack in most batteryoperated 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
100KHz to 320KHz range, small size switching
components are ideal for battery powered portable equipments, like notebook and palmtop
computers.
TYPICAL APPLICATION CIRCUIT
100µF
+
C1
5V
0.047µF
C4
Negative LCD Contrast Bias Power Supply
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1650-02 Dec 27, 00 TEL: 886-3-5772500 FAX: 886-3-5772510
VIN
VREF
SHDN
FB GND
AIC1650
R2
100K
CL
DHI
DLOW
R1
1M
RB
1.5K~12K
C3
10nF
Q1
2N2907A
* Sumida CD-54 SERIES
V
OUT
V
IN
+4V ~ 20V
D1 1N5819
*L
150µH
= -1.22V x R1/R2
F
100
C2
+
V
OUT
-12V~ -40V
1
ORDERING INFORMATION
AIC1650 XX
ORDER NUMBER
AIC1650
PIN CONFIGURATION
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~+70°C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .....................
Voltage
SHDN
Operating Temperature Range
Storage Temperature Range ..
TEST CIRCUIT
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS
.............................................……………....................................
............................…………..................................
..........................………........................... 0°C~
................................………...............
fied.)
AIC1650CN
(PLASTIC DIP)
AIC1650CS
(PLASTIC SO)
TOP VIEW
. -65
VIN
VREF
SHDN
°C~
FB
70
150
1
2
3
4
20V
15V
°C
°C
(VIN=13V, Ta=25°°°°C, unless otherwise speci-
8
7
6
5
CL
DHI
DLOW
GND
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Voltage 4 20 V
Switch Off Current V
V
Voltage I
REF
V
Source Current 250 µA
REF
DLOW “ON Resistance” 15 Ω
DHI “ON Resistance” 10 Ω
CL Threshold 507090mV
Shutdown Threshold 0.8 1.5 2.4 V
Shutdown Mode Current V
= -50mV 100 200 µA
FB
SOURCE
= 250µA 1.16 1.22 1.28 V
=0V 8 20 µA
SHDN
2
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