SC1540CS-3.3.TR [SEMTECH]
Fixed Positive LDO Regulator, 3.3V, 1.3V Dropout, PDSO8, SO-8;
| 型号： | SC1540CS-3.3.TR |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 3.3V, 1.3V Dropout, PDSO8, SO-8 光电二极管 |
| 文件： | 总5页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC1540(A)
300mA And 500mA Low Dropout
Voltage Regulators With Enable
PRELIMINARY
POWER MANAGEMENT
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 variations in line, load
and temperature. The SC1540A device is rated for
500mA output current, while the SC1540 is rated for
300mA.
u Low dropout performance, 1.3V max
u Full current rating over line and temperature
u Fast transient response
u +2% total output regulation over line, load
and temperature
u 10µA max. quiescent current in shutdown
u Three fixed output voltages
u Line regulation 0.2% max.
Outstanding features 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.
u Load regulation 0.4% max.
u SO-8 package
Applications
u Low voltage microcontrollers
u Switching power supply post-regulation
u Instantly available circuits
u Peripheral cards
With three voltage options available, the SC1540(A)
comes in the popular SO-8 surface mount package.
Typical Application Circuit
U1 SC1540(A)
8
1
VOUT
VIN
OUT
GND
NC
IN
2
3
4
7
6
5
NC
EN
NC
ENABLE
NC
C1
C2
+
+
10uF min Tant. or
10uF Tant. or
Al. electrolytic
Al. electrolytic
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.
Revision 1, December 2000
1
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SC1540(A)
POWER MANAGEMENT
PRELIMINARY
Absolute Maximum Rating
Parameter
Symbol
VIN, VEN
PD
Maximum
Units
V
Maximum Input Pin Voltage
7
Internally Limited
47
Power Dissipation
W
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient (1)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec
°C/W
°C/W
°C
qJC
65
qJA
TJ
0 to 125
-65 to 150
300
TSTG
TLEAD
°C
°C
Note:
(1) 2 inches square of 1/16 FR-4, double sided, 1 oz. minimum copper weight.
Electrical Characteristics
Unless otherwise specified: IOUT = 0mA to 300mA (500mA for SC1540A), VEN = VIN; 1.8V Option: VIN = 3.2V 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.
Parameter
Symbol
Conditions
Min
-1%
-2%
Typ
Max
+1%
+2%
0.2
Units
Output Voltage(1)
VOUT
VIN = 5V, IOUT = 0mA
VOUT
V
Line Regulation(1)
Load Regulation(1)
REG(LINE)
REG(LOAD)
IOUT = 10mA
VIN = 5V
0.035
0.2
%
%
0.4
Dropout Voltage(1)(2)
SC1540
SC1540A
VD
I
= 300mA
1.10
1.30
V
IOOUUTT = 500mA
Current Limit(1)
SC1540
SC1540A
ICL
330
550
mA
mA
Quiescent Current
IQ
VIN = VEN = 5V
5
6
7
10
8
VIN = 5V, VEN < 0.25V
µA
V
10
Enable Input Voltage
VIL
VIH
IEN
Device OFF
Device ON
0.25
0.45
(VO+0.5) (VO+0.8)
Enable Input Bias Current
Temperature Coefficient
VEN = 0V, VIN = 5V (OFF)
VEN = VIN = 5V (ON)
0.1
15
1.0
25
µA
TC
0.005
%/°C
ã 2000 Semtech Corp.
2
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SC1540(A)
POWER MANAGEMENT
PRELIMINARY
Electrical Characteristics (Cont.)
Unless otherwise specified: IOUT = 0mA to 300mA (500mA for SC1540A), VEN = VIN; 1.8V Option: VIN = 3.2V 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.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Temperature Stability
RMS Output Noise(3)
Ripple Rejection Ratio(4)
TS
VN
RA
0.5
0.003
72
%
%VOUT
dB
VIN = 5V
60
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) DVOUT, DVREF = 1%
(3) Bandwidth of 10 Hz to 10kHz.
(4) 120Hz input ripple.
ã 2000 Semtech Corp.
3
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SC1540(A)
POWER MANAGEMENT
PRELIMINARY
Pin Configuration
Ordering Information
(1)(2)
Device
Output Current
Package
TOP VIEW
SC1540CS-X.X.TR
SC1540ACS-X.X.TR
300mA
500mA
SO-8
SO-8
Notes:
(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. A reel
contains 2500 devices.
SO-8
Block Diagram
ã 2000 Semtech Corp.
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SC1540(A)
POWER MANAGEMENT
PRELIMINARY
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.
Contact Information
Semtech Corporation
Power Management Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
ã 2000 Semtech Corp.
5
www.semtech.com
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