SC1563IMS-2.8TR [SEMTECH]
Fixed/Adjustable Positive LDO Regulator, 1.2V Min, 4.8V Max, 0.7V Dropout, CMOS, PDSO8, MSOP-8;
| 型号： | SC1563IMS-2.8TR |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fixed/Adjustable Positive LDO Regulator, 1.2V Min, 4.8V Max, 0.7V Dropout, CMOS, PDSO8, MSOP-8 光电二极管 输出元件 调节器 |
| 文件： | 总8页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
•= 450mV dropout @ 500mA
The SC1563 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 500 milliamps. Since
it has superior dropout characteristics compared to
regular LDOs, it can be used to supply 2.5V on
motherboards or 2.8V on peripheral cards from the
3.3V supply with no heatsink. Additionally, the SC1563
has a shutdown pin, to further reduce power
dissipation while shut down. The SC1563 provides
excellent regulation over variations in line, load and
temperature.
•= Designed to operate with ceramic capacitors
•= Adjustable output from 1.200V to 3.3V
•= Multiple output voltage options (all parts also
adjustable externally using resistors)
•= Over current and over temperature protection
•= Enable pin
•= 1µA quiescent current in shutdown
•= Low reverse leakage (output to input)
•= Full industrial temperature range
APPLICATIONS
•= Battery powered systems
•= Motherboards
•= Peripheral cards
•= PCMCIA cards
The SC1563 is available as a five terminal fixed or
adjustable output voltage device with enable. The
device is available in a 5-pin SOT-23 package and an
8-pin MSOP package for higher power dissipation/
lower junction temperature.
ORDERING INFORMATION
DEVICE(1)(2)(3)
SC1563ISK-X.XTR
SC1563IMS-X.XTR
PACKAGE
SOT-23-5L
MSOP-8
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V.
(2) Output voltage can be adjusted using external re-
sistors, see Pin Description.
(3) Only available in tape and reel packaging. A reel
contains 2500 devices (MSOP-8) or 3000 devices
(SOT-23-5L).
TYPICAL APPLICATION
Internally Preset Output Voltage
Externally Set Output Voltage
U1
SC1563ISK-X.X
VO
U1
SC1563ISK-X.X
VO
5
1
4
5
1
4
VIN
VO (X.XV)
VIN
VO
VIN
VIN
R1
R2
SHDN
SHDN
GND ADJ
GND ADJ
SHDN
SHDN
2
3
2
3
C1
C2
C1
C2
1.200 (R1 + R2)
VO
=
Volts
R2
1
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
VIN
Maximum
5.5
Units
V
Input Voltage
Power Dissipation
PD
Internally Limited
W
Thermal Resistance Junction to Ambient
MSOP-8(1)
MSOP-8(2)
SOT-23-5L(1)
206
95
256
°C/W
θJA
Thermal Resistance Junction to Case
MSOP-8
SOT-23-5L
39
81
°C/W
θJC
TA
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
-40 to+85
-40 to 150
-65 to 150
300
°C
°C
°C
°C
kV
TJ
TSTG
TLEAD
ESD
Lead Temperature (Soldering) 10 Sec.
ESD Rating
2
Notes:
(1) Minimum pad size.
(2) 1 square inch of FR-4, double sided, 1oz. minimum copper weight.
ELECTRICAL CHARACTERISTICS
Unless specified: VSHDN = 0V
Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2 to 5.5V and IO = 10µA to 500mA
Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 500mA
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
2.2
Typ
Max
Units
VIN
Supply Voltage Range
Quiescent Current
VIN
IQ
V
5.5
150
2
VIN = 3.3V
100
0.5
µA
µA
VIN = 5.5V, VSHDN = Open
VO
Output Voltage(1)
(Internal Fixed Voltage)
Line Regulation(1)
Load Regulation(1)
VO
VIN = VO + 0.7V, IO = 10mA
0.99VO
VO
VO
1.01VO
1.02VO
0.3
V
0.98VO
REG(LINE) VIN = (VO + 0.25V) to 5.5V, IOUT = 10mA
REG(LOAD) VIN = VO + 0.7V
0.035
0.2
%
%
0.4
2
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
ELECTRICAL CHARACTERISTICS (Cont.)
Unless specified: VSHDN = 0V
Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2 to 5.5V and IO = 10µA to 500mA
Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 500mA
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
1
Max
Units
mV
VO (Cont.)
Dropout Voltage(2)
VD
ILOAD = 2mA
5
10
I
LOAD = 100mA
LOAD = 250mA
75
100
150
300
400
550
700
10
mV
I
200
450
1
mV
ILOAD = 500mA
mV
Minimum Load Current(3)
Current Limit
IO
VIN = VO + 0.7V
µA
A
ICL
0.50
1.00
ADJ
Reference Voltage(1)
VREF
VIN = 2.2V, VADJ = VOUT, IO = 10mA
1.188
1.200
1.212
V
1.176
1.224
Adjust Pin Current(4)
Adjust Pin Threshold(5)
SHDN
IADJ
VADJ = VREF
50
nA
V
100
VTH(ADJ)
0.20
0.10
1.8
0.40
Shutdown Pin Current
Shutdown Pin Threshold
ISHDN
VIH
VSHDN = 0V, VIN = 3.3V
VIN = 3.3V
1
µA
V
10
VIL
VIN = 3.3V
0.4
OVER TEMPERATURE PROTECTION
High Trip Level
Hysteresis
THI
165
10
°C
°C
THYST
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at
a differential of 0.7V.
(3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement.
Adjustable versions only.
(4) Guaranteed by design.
(5) When VADJ exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the
error amplifier and connects VADJ instead.
3
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
BLOCK DIAGRAM
PIN CONFIGURATIONS
Top View
Top View
MSOP-8
SOT-23-5L
PIN DESCRIPTION
Pin
Pin Number
Pin Function
Name SOT-23-5L MSOP-8
ADJ
3
3
This pin, when grounded, sets the output voltage to that set by the internal feed-
back resistors. If external feedback resistors are used, the output voltage will be
(See Application Circuit):
1.200(R1+R2)
VO
=
Volts
R2
GND
VIN
2
5
5-8
1
Reference ground. Connect all MSOP-8 GND pins. These pins may be used for
heatsinking purposes.
Input voltage. For regulation at full load, the input to this pin must be between (VO
+ 0.7V) to 5.5V. Minimum VIN = 2.2V.
VO
4
1
4
2
This pin is the power output of this device.
SHDN
Shutdown Input. Leaving this pin open turns the regulator off, reducing the quies-
cent current to a fraction of its operating value (typically <100nA). The device will
be enabled if this pin is pulled below 0.4V. Connect to GND if not being used.
4
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
TYPICAL APPLICATION (Externally Set Output Voltage)(1)(2)
U1
SC1563IS-X.X
VO
5
1
4
VIN
VO
VIN
R1
R2
SHDN
SHDN
GND ADJ
2
3
C1
1uF
C2
10uF
1.200 (R1+ R2)
VO
=
Volts
R2
TYPICAL APPLICATIONS (Internally Set Output Voltage)(2)
U1
SC1563IS-X.X
VO
4
5
1
VIN
VO (X.XV)
VIN
SHDN
SHDN
ADJ
3
GND
2
C1
1uF
C2
10uF
U1 SC1563IMS-X.X
1
2
3
4
8
7
6
5
VIN
VIN
GND
GND
GND
GND
SHDN
SHDN
ADJ
VO
VO (X.XV)
C1
1uF
C2
10uF
Notes:
(1) Maximum VO setpoint is 3.3V.
(2) This device is designed to operate with ceramic input and output capacitors.
5
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
Thus PD(MAX) = 0.514W.
APPLICATIONS INFORMATION
Using this figure, and assuming TA(MAX) = 85°C, we can
calculate the maximum thermal impedance allowable
to maintain TJ ≤ 150°C:
Introduction
The SC1563 is intended for applications such as
graphics cards where high current capability and very
low dropout voltage are required. It provides a very
simple, low cost solution that uses little pcb real estate
and typically does not require a heatsink. Additional
features include an enable pin to allow for a very low
power consumption standby mode, and a fully ad-
justable output.
TJ(MAX ) − TA(MAX )
=
(
150 − 70
)
= 156°C / W
RTH(J−A )(MAX )
=
PD(MAX )
0.514
This should be achievable using pcb copper area to aid
in conducting the heat away from the device. Internal
ground/power planes and air flow will also assist in re-
moving heat. For higher ambient temperatures addi-
tional board copper may be required. Use of the avail-
able MSOP-8 package will allow operation at full load
where higher input to output voltage differentials exist.
Component Selection
Input capacitor - a 1µF ceramic capacitor is recom-
mended. This allows for the device being some dis-
tance from any bulk capacitance on the rail. Addition-
ally, input droop due to load transients is reduced, im-
proving load transient response. Additional capaci-
tance may be added if required by the application.
MARKING INFORMATION
MSOP-8
Output capacitor - a minimum bulk capacitance of 1µF,
along with a 0.1µF ceramic decoupling capacitor is rec-
ommended. Increasing the bulk capacitance will im-
prove the overall transient response. The use of multi-
ple lower value ceramic capacitors in parallel to
achieve the desired bulk capacitance will not cause
stability issues. Although designed for use with ce-
ramic output capacitors, the SC1563 is extremely toler-
ant of output capacitor ESR values and thus will also
work comfortably with tantalum output capacitors.
External voltage selection resistors - the use of 1% re-
sistors, and designing for a current flow ≥ 10µA is rec-
ommended to ensure a well regulated output (thus R2
≤ 120kΩ).
SOT-23-5L
Thermal Considerations
The power dissipation in the SC1563 is approximately
equal to the product of the output current and the input
to output voltage differential:
PD
≈
(
VIN − VOUT • IO
)
The absolute worst-case dissipation is given by:
PD(MAX )
=
VIN (MAX ) − VOUT
• IO(MAX ) + VIN (MAX ) • IQ(MAX )
(MIN )
For a typical scenario, VIN = 3.3V ± 5%, VOUT = 2.5V
and IO = 500mA, therefore:
63XX = SC1563, voltage option (example: 6318)
yyww = Datecode (example: 0008)
XXXX = Lot number (example: E01102)
VIN(MAX) = 3.465V, VOUT(MIN) = 2.450V and
IQ(MAX) = 1.75mA,
6
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
DEVICE OUTLINE - SOT-23-5
LAND PATTERN - SOT-23-5
7
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
SC1563
PRELIMINARY - September 11, 2000
OUTLINE DRAWING - MSOP-8
LAND PATTERN - MSOP-8
ECN00-1343
8
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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