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SC1404ISSTRT

更新时间： 2024-02-28 04:01:53
品牌 Logo 应用领域
商升特 - SEMTECH 控制器
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27页 501K
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中文翻译

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SC1404ISSTRT 数据手册

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SC1404  
Mobile Multi-Output PWM Controller  
with Virtual Current SenseTM  
POWER MANAGEMENT  
Description  
Features  
ꢀ 6 to 30V input range (operation possible below 6V)  
ꢀ 3.3V and 5V dual synchronous outputs  
ꢀ Fixed-frequency or PSAVE for maximum efficiency over  
wide load current range  
The SC1404 is a multiple-output power supply controller designed  
to power battery operated systems. The SC1404 provides syn-  
chronous rectified buck converter control for two power supplies.  
An efficiency of 95% can be achieved. The SC1404 uses  
Semtech’s proprietary Virtual Current SenseTM technology along  
with external error amplifier compensation to achieve enhanced  
stability and DC accuracy over a wide range of output filter compo-  
nents while maintaining fixed frequency operation. The SC1404  
also provides two linear regulators for system housekeeping. The  
5V linear regulator takes its input from the battery; for efficiency,  
the output is switched to the 5V output when available. The 12V  
linear regulator output is generated from a coupled inductor off  
the 5V switching regulator.  
ꢀ 5V/50mA linear regulator  
ꢀ 12V/200mA linear regulator  
ꢀ Virtual Current Sense TM for enhanced stability  
ꢀ Accurate low-loss current limiting  
ꢀ Out-of-phase switching reduces input capacitance  
ꢀ External compensation supports wide range of  
output filter components for reduced cost  
ꢀ Programmable power-up sequence  
ꢀ Power Good output  
ꢀ Output overvoltage & overcurrent protection with output  
undervoltage shutdown  
ꢀ 4µA typical shutdown current  
Control functions include: power up sequencing, soft start, power-  
good signaling, and frequency synchronization. Line and load  
regulation is to +/-1% of the output voltage. The internal oscilla-  
tor can be adjusted to 200 kHz or 300 kHz or synchronized to an  
external clock. The MOSFET drivers provide >1A peak drive cur-  
rent for fast MOSFET switching.  
ꢀ 6mW typical quiescent power  
Applications  
ꢀ Notebook and Subnotebook Computers  
ꢀ Automotive Electronics  
The SC1404 includes a PSAVE# input to select pulse skipping  
mode for high efficiency at light load, or fixed frequency mode for  
low noise operation.  
ꢀ
Desktop DC-DC Converters  
Typical Application Circuit  
INPUT +6V to +30V  
+5V ALW AYS O N  
0.1uF  
+
SC1404 O N/O FF  
10  
4.7uF  
U4  
22  
+12V O UTPUT  
V+  
0.22uF  
4
12OUT  
5
4.7uF  
+
VDD  
23  
3
SC1404 O N/O FF  
SHDN  
12  
COMP3  
COMP5  
C7  
C11  
+
25  
18  
2.2uF  
BST3  
BST5  
SC1404  
0.1uF  
0.1uF  
0.1uF  
L1  
27  
26  
16  
DH3  
DH5  
T1  
+3V O UTPUT  
0.1uF  
+5V O UTPUT  
17  
PHASE3  
PHASE5  
24  
19  
20  
DL3  
DL5  
+
+
PGND  
1
2
14  
13  
CSH3  
CSL3  
CSH5  
CSL5  
15  
9
+2.5V REF  
SEQ  
REF  
28  
7
+
3V O N /O F F  
5V O N /O F F  
RUN/ON3  
ON5  
0.1uF  
11  
RESET  
PO W ER G O O D  
1
www.semtech.com  
Revision 4, July 2003  
1234567...27

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SC1404ITSTR SEMTECH

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 		Mobile Multi-Output PWM Controller with Virtual Current Sense
SC1404ITSTRT SEMTECH

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 		Dual Switching Controller, Current-mode, 380kHz Switching Freq-Max, PDSO28, ROHS COMPLIANT
SC1405 SEMTECH

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 		HIGH SPEED SYNCHRONOUS POWER MOSFET SMART DRIVER
SC1405B SEMTECH

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 		High Speed Synchronous Power MOSFET Smart Driver
SC1405B.TR SEMTECH

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 		Half Bridge Based MOSFET Driver, 3A, CMOS, PDSO14, 0.635 MM PITCH, MO-153AB1, TSSOP-14
SC1405B.TRT SEMTECH

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 		Half Bridge Based MOSFET Driver, 3A, PDSO14, 0.635 MM PITCH, MO-153AB1, TSSOP-14
SC1405BT SEMTECH

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 		Half Bridge Based MOSFET Driver, 2A, PDSO14, 0.635 MM PITCH, MO-153AB1, TSSOP-14
SC1405BTR SEMTECH

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 		Half Bridge Based MOSFET Driver, 2A, CMOS, PDSO14, 0.635 MM PITCH, MO-153AB1, TSSOP-14
SC1405BTRT SEMTECH

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 		Half Bridge Based MOSFET Driver, 2A, PDSO14, 0.635 MM PITCH, MO-153AB1, TSSOP-14
SC1405BTS.TR SEMTECH

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 		High Speed Synchronous Power MOSFET Smart Driver

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