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參數資料
| 型號： | SC1650CS |
| 廠商： | Semtech Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | HIGH-VOLTAGE INVERTING DC-DC CONVERTER |
| 中文描述： | 高壓反相DC - DC變換器 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 90K |
| 代理商： | SC1650CS |
1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH-VOLTAGE INVERTING
DC-DC CONVERTER
SC1650
January 29, 1998
ORDERING INFORMATION
DEVICE
(1)
Note:
(1) Add suffix ‘TR’ for tape and reel.
FEATURES
4V to 24V 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
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
100μA and can be reduced to 8μA 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.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
APPLICATIONS
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
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Supply Voltage
V
+
24
V
SHDN Voltage
V
SHDN
15
V
Operating
Temperature
Range
T
A
0 to 70
°C
Storage
Temperature
Range
T
STG
-65 to 125
°C
PIN CONFIGURATION
BLOCK DIAGRAM
V
OUT
Adj
PACKAGE
SC1650CS
SO-8
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