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参数资料
| 型号： | SC1578CS |
| 厂商： | Semtech Corporation |
| 英文描述： | CAP 47UF 50V ELECT TG SMD |
| 中文描述： | 高效降压型DC - DC转换器 |
| 文件页数： | 1/5页 |
| 文件大小： | 130K |
| 代理商： | SC1578CS |
1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH-EFFICIENCY STEP-DOWN
DC-DC CONVERTER
SC1578
January 29, 1998
FEATURES
4V to 24V input voltage operation.
High efficiency (up to 95%).
Low quiescent current at 90A.
Pulse-skipping and pulse-frequency modulation.
Inputs-uncommitted current sense comparator.
Duty cycle adjustable
90kHz to 280kHz oscillator frequency
Power-saving shutdown mode (8A Typical).
Push-pull driver output
DESCRIPTION
The SC1578 is a high performance step-down DC-DC
converter, designed to drive an external P-channel
MOSFET to generate programmable output voltages.
Two main schemes of pulse-skipping and pulse-
frequency modulation are employed to maintain low
quiescent current and high conversion efficiency over
wide ranges of input voltage and loads. The SC1578
delivers 10mA to 2A of output current with 87%-93%
efficiency at V
IN=9V, VOUT=5V. A current sense
comparator with both inverting and non-inverting inputs
uncommitted is included to provide the crucial function
of either current limit protection or constant output
current control. When the SC1578 is used in a high-
side current sensing step-down constant current
source, the efficiency is typically greater than 90%.
Duty cycle can be adjusted to greater than 90% by
connecting a resistor from the DUTY pin to V
IN.
Quiescent current is about 90A and can be reduced
to 8A in shutdown mode. With a switching frequency
range of 90kHz to 280kHz, small size switching
components may be used, which is ideal for battery
powered portable equipment.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
BLOCK DIAGRAM
APPLICATIONS
Notebook 5V/3.3V main power
Step-down DC-DC converter module.
Constant current source for battery chargers.
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Supply Voltage
V
IN
24
V
Duty Voltage
V
DUTY
20
V
SHDN Voltage
V
SHDN
15
V
Operating
Temperature Range
T
A
0 to 70
°C
Storage Temperature
Range
T
STG
-65 to 150
°C
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SC1578CS
SO-8
Note:
(1) Add suffix ‘TR’ for tape and reel.
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