MICROPOWER INVERTING
DC-DC CONVERTER
January 29, 1998
SC1652
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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 80碌A(chǔ) and can be
reduced to 0.7碌A(chǔ) 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.
FEATURES
鈥?/div>
2.4V to 7V input voltage operation
鈥?/div>
Adjustable output voltage up to -40V
鈥?/div>
Low quiescent current at 80碌A(chǔ)
鈥?/div>
Pulse frequency modulation maintains high
鈥?/div>
鈥?/div>
鈥?/div>
efficiency (max 87%)
70kHz to 160kHz switching frequency
Power-saving shutdown mode (0.7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
BLOCK DIAGRAM
鈥?/div>
ORDERING INFORMATION
DEVICE
(1)
V
OUT
Adj
PACKAGE
SO-8
SC1652CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating
Temperature Range
Storage Temperature
Range
Symbol
V
+
T
A
T
STG
Maximum
7.0
0 to 70
-65 to 125
Units
V
擄C
擄C
漏 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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英文版
SC1602_ETC.pdf
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