HIGH-VOLTAGE INVERTING
DC-DC CONVERTER
January 29, 1998
SC1650
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1650 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. The 4V to 24V
input operation range allows the SC1650 to be
powered directly by the battery pack in most battery-
operated applications for greater efficiency. The output
voltage can be scaled to -40V by two external
resistors. A pulse frequency modulation scheme is
employed to maintain high efficiency conversion under
wide input voltage ranges. Quiescent current is about
100碌A(chǔ) and can be reduced to 8碌A(chǔ) in shutdown mode.
With a switching frequency range of 100kHz to
320kHz, small size switching components may be
used, which is ideal for battery powered portable
equipment such as notebook and palmtop computers.
FEATURES
鈥?/div>
4V to 24V input voltage operation
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Adjustable output voltage up to -40V
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Low quiescent current at 100碌A(chǔ)
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Pulse frequency modulation maintains high
鈥?/div>
鈥?/div>
鈥?/div>
efficiency (max 90%)
100kHz to 320kHz switching frequency
Power-Saving shutdown mode (8碌A(chǔ) typical)
High efficiency with low cost external PNP bipolar
transistor
APPLICATIONS
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Negative LCD contrast bias for
1. Notebook & palmtop computers
2. Pen-based data systems
3. Portable data collection terminals
4. Personal digital assistants
Negative voltage supplies
鈥?/div>
BLOCK DIAGRAM
ORDERING INFORMATION
DEVICE
(1)
V
OUT
Adj
PACKAGE
SO-8
SC1650CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Symbol
V
+
V
SHDN
T
A
Maximum
24
15
0 to 70
V
V
擄C
PIN CONFIGURATION
SHDN Voltage
Operating
Temperature
Range
Storage
Temperature
Range
T
STG
-65 to 125
擄C
漏 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1650CS相關(guān)型號(hào)PDF文件下載
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