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參數(shù)資料
| 型號(hào)： | SC1652CS |
| 廠商： | Semtech Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | MICROPOWER INVERTING DC-DC CONVERTER |
| 中文描述： | 反相微功耗DC - DC變換器 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 81K |
| 代理商： | SC1652CS |
1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
MICROPOWER INVERTING
DC-DC CONVERTER
SC1652
January 29, 1998
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
FEATURES
2.4V to 7V input voltage operation
Adjustable output voltage up to -40V
Low quiescent current at 80μA
Pulse frequency modulation maintains high
efficiency (max 87%)
70kHz to 160kHz switching frequency
Power-saving shutdown mode (0.7μA typical)
High efficiency with low cost external PNP bipolar
transistor
DESCRIPTION
The SC1652 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. 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 80μA and can be
reduced to 0.7μA in shutdown mode. With a switching
frequency range of 70kHz to 160kHz, 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
DEVICE
(1)
V
OUT
Adj
PACKAGE
SC1652CS
SO-8
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Supply Voltage
V
+
7.0
V
Operating
Temperature Range
T
A
0 to 70
°C
Storage Temperature
Range
T
STG
-65 to 125
°C
BLOCK DIAGRAM
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