SC1541CS-X.X.TR [SEMTECH]
1.0A Low Dropout Voltage Regulator with Enable; 1.0A低压差稳压器与启用型号: | SC1541CS-X.X.TR |
厂家: | SEMTECH CORPORATION |
描述: | 1.0A Low Dropout Voltage Regulator with Enable |
文件: | 总6页 (文件大小:168K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SC1541
1.0A Low Dropout Voltage
Regulator with Enable
POWER MANAGEMENT
Description
Features
The SC1541 is a high performance low dropout positive
voltage regulator designed for use in applications where
power management is critical, such as battery powered
systems.
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 and TO-263 packages
Additionally, the SC1541 provides excellent regulation
over variations in line, load and temperature.
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.
Applications
Low voltage microcontrollers
Switching power supply post-regulation
Instantly available circuits
Motherboards
The SC1541 is available with three different voltage
options as standard and two package options, SO-8 and
5-lead TO-263.
Battery operated equipment
Typical Application Circuit
U1
IN
SC1541
OUT
VIN
VOUT
ENABLE SIGNAL
EN
GND
C1
C2
10uF
10uF min.
Tantalum
Tantalum
Notes:
(1) Input and output capacitors should be located close to the device.
(2) Connect all pins to PCB (SO-8 package) for optimal thermal characteristics.
(3) Increasing the output capacitor value will improve the overall transient response.
(4) The device is enabled when VEN = 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 SC1541 on and off.
Revision: February 11, 2004
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SC1541
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
Parameter
Symbol
VIN, VEN
PD
Maximum
7
Units
V
Maximum Input Pin Voltage
Power Dissipation
Internally Limited
W
Thermal Resistance Junction to Case
SO-8
39
3
°C/W
°C/W
θJC
TO-263
Thermal Resistance Junction to Ambient
SO-8(1)
TO-263
65
60
θJA
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec
Note:
TJ
0 to 125
-65 to 150
300
°C
°C
°C
TSTG
TLEAD
(1) 1 inch square of 1/16” FR-4, double sided, 1 oz. minimum copper weight.
Electrical Characteristics
Unless otherwise specified: IO = 0mA to 1A, 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
Output Voltage (1)
Symbol
Min
-1
Typ
Max
+1
Units
VOUT
VIN = 5V, IOUT = 0mA
VOUT
%
-2
+2
Line Regulation(1)
Load Regulation(1)
Dropout Voltage(1)(2)
Current Limit(1)
REG(LINE)
IOUT = 10mA
VIN = 5V
0.035
0.2
0.2
0.4
1.30
%
%
REG(LOAD)
VD
ICL
IQ
IOUT = 1A
1.10
V
1.1
A
Quiescent Current
VIN = VEN = 5V
5
6
7
10
8
mA
VIN = 5V, VEN < 0.25V
µA
V
10
Enable Pin Control Voltage
Enable Pin Current
VEN
Device OFF
Device ON
0.25
0.45
(VOUT + 0.5) (VOUT + 0.8)
IEN
VEN = 0V, VIN = 5V (OFF)
0.1
15
1.0
25
µA
V
EN = VIN = 5V (ON)
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SC1541
PRELIMINARY
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified: IO = 0mA to 1A, 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
Min
Typ
0.005
0.5
Max
Units
%/C
%
Temperature Coefficient
Temperature Stability
RMS Output Noise(3)
Ripple Rejection Ratio(4)
TC
TS
VN
RA
0.003
72
%VOUT
dB
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.
(5) This device is ESD sensitive. Use of standard ESD handling precautions is required.
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SC1541
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device(1)(2)
Package
SC1541CM-X.X.TR
SC1541CM-X.X.TRT(3)
SC1541CS-X.X.TR
SC1541CS-X.X.TRT(3)
TO-263-5
SO-8
Notes:
SO-8
(1) Where X.X denotes voltage options. Available
voltages are: 1.8V, 2.5V and 3.3V. Contact factory for
additional voltage options.
TO-263-5
PIN FUNCTION
(2) Only available in tape and reel packaging. A reel
contains 800 (TO-263-5) or 2500 (SO-8) devices.
(3) Lead free product.
1
EN
GND
OUT
IN
2
3/TAB
4
Block Diagram
5
NC
Pin Descriptions
Pin Name SO-8 Pin # TO-263-5 Pin # Pin Function
EN
GND
NC
1
1
Active high enable for the regulator output. Connect to VIN if not being used.
Ground pin. Bottom end of the internal feedback resistor chain.
No connection.
2
2
5
4
3
IN
4
This is the input supply pin for the device.
OUT
5, 6, 7, 8
3/TAB
This is the power output of the device. This pin is electrically connected to
the tab of the TO-263-5 package.
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SC1541
POWER MANAGEMENT
Outline Drawing - SO-8
Land Pattern - SO-8(1)
Note:
(1) More copper area should be used to lower RTH(J-A) as needed.
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SC1541
POWER MANAGEMENT
Outline Drawing - TO-263-5L
Land Pattern - TO-263-5L(1)
Note:
(1) More copper area should be used to lower RTH(J-A) as needed.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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