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SC1540ACS-3.3-.TR [SEMTECH]

3.3V FIXED POSITIVE LDO REGULATOR, 1.3V DROPOUT, PDSO8, SO-8;
SC1540ACS-3.3-.TR
型号： SC1540ACS-3.3-.TR
厂家： SEMTECH CORPORATION    SEMTECH CORPORATION
描述：

3.3V FIXED POSITIVE LDO REGULATOR, 1.3V DROPOUT, PDSO8, SO-8

光电二极管 输出元件 调节器
文件： 总4页 (文件大小：64K)
中文：  中文翻译
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300mA AND 500mA LOW DROPOUT  
VOLTAGE REGULATORS WITH ENABLE  
SC1540  
SC1540A  
PRELIMINARY - May 1, 2000  
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com  
DESCRIPTION  
FEATURES  
The SC1540 and SC1540A are high performance low  
dropout positive voltage regulators designed for use in  
applications where power management is critical, such  
as battery powered systems. Additionally, the  
SC1540(A) provides excellent regulation over varia-  
tions in line, load and temperature. Outstanding fea-  
tures include low dropout performance at rated current,  
fast transient response, internal current limiting and  
thermal shutdown protection of the output device. A  
very low quiescent current of 10µA in shutdown mode  
reduces power dissipation. With three voltage options  
available, the SC1540(A) comes in the popular SO-8  
surface mount package.  
•= Low dropout performance, 1.3V max  
•= Full current rating over line and temperature  
•= Fast transient response  
•= +2% total output regulation over line, load and  
temperature  
•= 10µA max. quiescent current in shutdown  
•= Three fixed output voltages  
•= Line regulation 0.2% max.  
•= Load regulation 0.4% max.  
•= SO-8 package  
ORDERING INFORMATION  
DEVICE(1)(2)  
SC1540CS-X.X  
SC1540ACS-X.X  
Notes:  
OUTPUT CURRENT PACKAGE  
300mA  
500mA  
SO-8  
SO-8  
APPLICATIONS  
•= Active SCSI termination  
•= Low voltage microcontrollers  
•= Switching power supply post-regulator  
(1) Where X.X denotes voltage options. Available voltages  
are: 1.8V, 2.5V and 3.3V. Contact factory for additional  
voltage options.  
(2) Only available in tape and reel packaging (suffix ‘.TR’)  
e.g. SC1540CS-X.X-.TR.  
BLOCK DIAGRAM  
ABSOLUTE MAXIMUM RATINGS  
Parameter  
Symbol Maximum Units  
Maximum Input Pin  
Voltage  
VIN, EN  
PD  
7
V
Power Dissipation  
Internally  
Limited  
W
Thermal Resistance  
Junction to Case  
SO-8  
47  
°C/W  
θJC  
Thermal Resistance  
Junction to Ambient  
SO-8(1)  
65  
°C/W  
°C  
θJA  
PIN CONFIGURATIONS  
Operating Junction  
Temperature Range  
TJ  
0 to 125  
Top View  
Storage Temperature  
Range  
TSTG  
-65 to 150  
260  
°C  
°C  
Lead Temperature  
(Soldering) 10 Sec  
TLEAD  
Notes:  
(1) 2 inch square of 1/16” FR-4, double sided, 1 oz.  
minimum copper weight.  
SO-8  
1
© 2000 SEMTECH CORP.  
652 MITCHELL ROAD NEWBURY PARK CA 91320  
300mA AND 500mA LOW DROPOUT  
VOLTAGE REGULATORS WITH ENABLE  
SC1540  
SC1540A  
PRELIMINARY - May 1, 2000  
ELECTRICAL CHARACTERISTICS  
Unless otherwise specified: IO = 0mA to 300mA (500mA for SC1540A), EN = VIN  
1.5V Option: VIN = 2.9V to 7.0V  
2.5 Option: VIN = 3.9V to 7.0V  
3.3V Option: VIN = 4.7V to 7.0V  
Values in bold apply over full operating temperature range.  
Test Conditions  
Test Limits  
Typ  
Parameter  
Symbol  
Min  
Max  
Units  
Output Voltage (1)  
VO  
VIN = 5V, IO = 0mA  
0.99|VO|  
0.98|VO|  
VO  
1.01|VO|  
1.02|VO|  
0.2  
V
VO  
Line Regulation(1)  
Load Regulation(1)  
REG(LINE)  
REG(LOAD)  
IO = 10mA  
VIN = 5V  
%
%
0.035  
0.2  
0.4  
Dropout Voltage(1)(2)  
SC1540  
SC1540A  
VD  
IO = 300mA  
IO = 500mA  
V
1.10  
1.30  
Current Limit(1)  
SC1540  
SC1540A  
ICL  
IQ  
mA  
mA  
330  
550  
Quiescent Current  
VIN = 5V, EN = VIN  
5
6
7
10  
8
VIN = 5V, EN < 0.25V  
µA  
V
10  
Enable Pin Control Voltage  
Enable Pin Current  
EN  
IEN  
Device OFF  
Device ON  
0.25  
0.45  
(VO+0.5) (VO+0.8)  
EN = 0V, VIN = 5V (OFF)  
EN = VIN = 5V (ON)  
0.1  
15  
µA  
1.0  
25  
Temperature Coefficient  
Temperature Stability  
RMS Output Noise(3)  
TC  
TS  
VN  
RA  
%/°C  
%
0.005  
0.5  
0.003  
72  
%VO  
dB  
Ripple Rejection Ratio(4)  
VIN = 5V  
60  
NOTES:  
(1) Low duty cycle pulse testing with Kelvin connections required.  
(2) ∆VOUT, ∆ VREF = 1%  
(3) Bandwidth of 10 Hz to 10kHz.  
(4) 120Hz input ripple.  
2
© 2000 SEMTECH CORP.  
652 MITCHELL ROAD NEWBURY PARK CA 91320  
300mA AND 500mA LOW DROPOUT  
VOLTAGE REGULATORS WITH ENABLE  
SC1540  
SC1540A  
PRELIMINARY - May 1, 2000  
TYPICAL APPLICATION  
U1  
VIN  
SC1540(A)  
VO  
VIN  
VOUT  
ENABLE SIGNAL  
EN  
GND  
C1  
C2  
10uF  
Tantalum  
10uF min.  
Tantalum  
NOTES  
(1) Input and output capacitors should be located close to the device.  
(2) Connect all pins to PCB for optimal thermal characteristics.  
(3) Increasing the output capacitor value will improve the overall transient response.  
(4) The device is enabled when EN = VIN, and shut down when EN is pulled to ground. EN should not be taken  
higher than VIN. A CMOS signal referenced to VIN would be ideal for switching the SC1540(A) on and off.  
3
© 2000 SEMTECH CORP.  
652 MITCHELL ROAD NEWBURY PARK CA 91320  
300mA AND 500mA LOW DROPOUT  
VOLTAGE REGULATORS WITH ENABLE  
SC1540  
SC1540A  
PRELIMINARY - May 1, 2000  
OUTLINE DRAWING - SO-8  
JEDEC  
REF: MS-012AA  
LAND PATTERN - SO-8(1)  
Note:  
(1) More copper area should be used to lower RTH(J-A) as needed.  
ECN00-1038  
4
© 2000 SEMTECH CORP.  
652 MITCHELL ROAD NEWBURY PARK CA 91320  

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