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參數資料
| 型號： | SC1628CS |
| 廠商： | Semtech Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | HIGH-EFFICIENCY STEP-UP DC-DC CONVERTER |
| 中文描述： | 高效降壓型DC - DC轉換器 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 121K |
| 代理商： | SC1628CS |
1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH-EFFICIENCY STEP-UP
DC-DC CONVERTER
SC1628
January 30, 1998
Note:
(1) Add suffix ‘TR’ for tape and reel.
FEATURES
4V to 24V input voltage operation
Adjustable output voltage
Low quiescent current at 100μA
Pulse-skipping and pulse-frequency modulation
maintain high efficiency (max. 95%)
90kHz to 250kHz oscillator frequency
Power-saving shutdown mode (8μA typical)
Push-pull driver output
DESCRIPTION
The SC1628 is a high performance step-up DC-DC
converter, designed to drive an external power switch
to generate programmable positive voltages. In the
particularly suitable LCD contrast bias and flash
memory programming power supply applications,
typical full load efficiencies are 85% to 95%. The 4V to
24V input operation range allows the SC1628 to be
powered directly by the battery pack in most battery-
powered applications for greater efficiency. The 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 ranges. Quiescent current is about
100μA and can be reduced down to 8μA in shutdown
mode. With a switching frequency range of 90kHz to
250kHz, 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
BLOCK DIAGRAM
APPLICATIONS
Flash memory programming power supply
Positive LCD contrast bias for notebook and palm-
top computers
Step-up DC-DC converter module
Telecom power supply
ORDERING INFORMATION
DEVICE
(1)
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Supply Voltage
V
IN
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
PACKAGE
SC1628CS
SO-8
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