MIC5281-5.0YMM-TR [MICROCHIP]
FIXED POSITIVE LDO REGULATOR;
| 型号： | MIC5281-5.0YMM-TR |
| 厂家： | 
MICROCHIP |
| 描述： | FIXED POSITIVE LDO REGULATOR 信息通信管理 光电二极管 输出元件 调节器 |
| 文件： | 总17页 (文件大小：901K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5281
120VIN, 25mA, Ultra-Low IQ, High-PSRR
Linear Regulator
Features
General Description
• Wide input voltage range: 6V to 120V DC
• Ultra-low quiescent current: 6µA
• 25mA guaranteed output current
• Adjustable output from 1.27V to 5.5V
• Withstands up to +120V DC at the input
• Stable with ceramic capacitors
• Ultra-high PSRR >90dB
• Ultra-high line rejection (load dump)
• High output accuracy:
− ±3% initial accuracy
• Thermal-shutdown and current-limit protection:
The MIC5281 high-performance linear regulator offers a
very-wide input operating voltage range, up to 120V DC,
and supplies an output current of up to 25mA.
Ideal for high input voltage applications such as industrial
and telecom, the MIC5281 offers ±3% initial accuracy,
extremely high-power supply rejection ratio (>90db) and
ultra-low quiescent current of 6µA. The MIC5281 is
optimized for high-voltage line transients, making it ideal
for harsh environment applications.
The MIC5281 is offered in both fixed output voltage
(3.3V/5.0V) and adjustable output voltage (1.27V to 5.5V)
options.
The MIC5281 operates over
a
−40ºC to +125ºC
− Thermally-efficient, 8-pin MSOP, and 8-pin ePad
temperature range and is available in lead-free, RoHS-
compliant, 8-pin ePad MSOP, and 8-pin MSOP packages
MSOP packages
Applications
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
• Industrial applications
• Remote keyless entry power supply
• Telecom applications
• Off-line power supplies
Typical Application
Quiescent Supply Current
vs. Input Voltage
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
VOUT = 5V
OUT = 0
I
0
20
40
60
80
100
120
INPUT VOLTAGE (V)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Revision 3.0
October 2, 2014
Micrel, Inc.
MIC5281
Ordering Information
Part Number
Output Voltage
Top Mark
781A
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
Lead Finish
MIC5281YMME
MIC5281-3.3YMME
MIC5281-5.0YMME
Adjustable
3.3V
8-Pin ePad MSOP
8-Pin ePad MSOP
8-Pin ePad MSOP
Pb-Free
Pb-Free
Pb-Free
781S
5.0V
7815
5281
YMM
MIC5281YMM
Adjustable
3.3V
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Pb-Free
Pb-Free
Pb-Free
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
5281
3.3Y
MIC5281-3.3YMM
MIC5281-5.0YMM
5281
5.0Y
5.0V
Pin Configuration
8-Pin ePAD MSOP
MIC5281-x.xYMME
8-Pin MSOP
MIC5281-x.xYMM
(TOP VIEW)
(TOP VIEW)
8-Pin ePAD MSOP
MIC5281YMME
8-Pin MSOP
MIC5281YMM
(TOP VIEW)
(TOP VIEW)
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Pin Description
Pin
MIC5281-x.xYMME
Name
Function
MIC5281YMME
MIC5281YMM
MIC5281-x.xYMM
Supply Voltage Input. Connect 1µF
capacitor from VIN to GND.
1
1
1
1
VIN
NC
Not internally connected. Connect
NC to GND or leave unconnected.
2, 3, 7
4
2, 3, 7
2, 3, 7
4
2, 3, 7
4
Bypass Capacitor Connection.
CPSRR Connect 0.1µF capacitor from
CPSRR to GND.
4
5
6
5
5
6
5
GND
FB
Ground.
Feedback Connection. For external
resistor divider to set VOUT
−
−
.
Sense input. Connect SNS to
VOUT.
6
8
6
8
−
SNS
VOUT
EP
−
8
−
8
−
Regulator Output. Connect 10µF
capacitor from VOUT to GND.
Exposed Pad (ePad) for Thermal
Relief. Connect EP to GND.
EP
EP
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Absolute Maximum Ratings(1)
Operating Ratings(2)
VIN to GND................................................... –0.3V to +125V
VCPSRR to GND..................................................–0.3 to +14V
VFB, VSNS, VOUT to GND ................................... –0.3V to +6V
Lead Temperature (soldering, 10s)..........................+260°C
Junction Temperature .........................–40°C ≤ TJ ≤ +125°C
Storage Temperature .........................–65°C ≤ TA ≤ +150°C
ESD Ratings(4)
VIN ................................................................. +6V to +120V
VOUT Adjust Range ..................................... +1.27V to +5.5V
Junction Temperature .........................–40°C ≤ TJ ≤ +125°C
Power Dissipation (PD)...........................Internally Limited(3)
Junction Thermal Resistance (θJA)
8-pin ePad MSOP..............................................64°C/W
8-pin MSOP.....................................................160°C/W
HBM.........................................................................2kV
MM.........................................................................200V
Electrical Characteristics(5)
VIN = 12V, CIN = 1.0µF, CPSRR = 0.1µF, COUT = 10µF, VOUT = 5.0V or 3.3V, IOUT = 100µA, TA = 25°C, bold values indicate
–40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
Power Supply Input
Input Voltage Range(6)
Quiescent Supply Current
Output Voltage
6
120
V
IOUT = 0
6
11
µA
Adjustable
Fixed 3.3V
1.27
3.2
5.5
3.4
3.3
3.3
5.0
5.0
Output Voltage
3.13
4.85
4.75
−3
3.47
5.15
5.25
+3
V
Fixed 5.0V
%
%
%
%
Output Voltage Accuracy
Variation from nominal VOUT
+5
−5
Load Regulation
Line Regulation(7)
IOUT = 100µA to 25mA
VIN = 10V to 120V
0.2
+1.0
+0.5
−1.0
−0.5
0.04
Feedback Input (Adjustable)
1.232
1.270
1.270
3.2
1.308
FB Voltage
V
1.206
1.333
FB Current
VFB = 1.27V
nA
Current Limit
Current Limit
VOUT = 0V
30
65
90
130
mA
dB
Ripple Rejection
Power Supply Rejection Ratio
Notes:
f = 20kHz to 2MHz
1. Exceeding an absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power
dissipation results in excessive die temperature, and causes the regulator to enter thermal shutdown.
4. Devices are ESD sensitive; use proper handling precautions. Human body model, 1.5kΩ in series with 100pF.
5. Specifications are for packaged products only.
6. Assure that VIN ≥ (VOUT + 3V) and VIN ≥ 6V.
7. Line regulation is a percentage of VOUT
.
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Electrical Characteristics(5) (Continued)
VIN = 12V, CIN = 1.0µF, CPSRR = 0.1µF, COUT = 10µF, VOUT = 5.0V or 3.3V, IOUT = 100µA, TA = 25°C, bold values indicate
–40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
IOUT = 25mA
TJ rising
Min.
Typ.
Max.
Units
Power Dropout Voltage
Dropout Voltage
2
3
V
Thermal Protection
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
157
15
°C
°C
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Typical Characteristics
Quiescent Supply Current
Quiescent Supply Current
vs. Temperature
Output Voltage
vs. Input Voltage
vs. Input Voltage
11.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
5.15
5.10
5.05
5.00
4.95
4.90
4.85
VIN = 12V
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
V
OUT = 5V
VIN = 12V
V
OUT = 5V
I
OUT = 0
VOUT = 5V
IOUT = 5mA
I
OUT = 0mA
0
20
40
60
80
100
120
0
20
40
60
80
100
120
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage
vs. Temperature
Dropout Voltage
vs. Output Current
Output Voltage
vs. Output Current
5.25
5.25
3.00
2.50
2.00
1.50
1.00
0.50
0.00
VIN = 12V
VIN = 12V
OUT = 5V
OUT = 5mA
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
VOUT = 5V
ADJUSTABLE OPTION
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
V
OUT = 5V
V
I
0
5
10
15
20
25
-50
-25
0
25
50
75
100
125
0
5
10
15
20
25
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
FB Voltage
vs. Input Voltage
FB Current
vs. Input Voltage
Dropout Voltage
vs. Temperature
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.31
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.23
VOUT = 5V
IOUT = 5mA
V
V
OUT = 5V
VOUT = 5V
FB = 1.267V
IOUT = 25mA
0
20
40
60
80
100
120
0
20
40
60
80
100
120
-50
-25
0
25
50
75
100
125
INPUT VOLTAGE (V)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Typical Characteristics (Continued)
FB Voltage
FB Current
FB Voltage
vs. Output Current
vs. Temperature
vs. Temperature
2.5
2.0
1.5
1.0
0.5
0.0
1.31
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.276
1.274
1.272
1.270
1.268
1.266
VIN = 12V
OUT = 5.0V
VIN = 12V
OUT = 5V
OUT = 5mA
VIN = 12V
FB = 1.267V
OUT = 0
V
V
V
I
I
0
5
10
15
20
25
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
125
25
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Load Regulation
vs. Temperature
Line Regulation
vs. Temperature
Current Limit
vs. Temperature
0.30
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
80
75
70
65
60
55
50
VIN = 10V to 120V
OUT = 5V
OUT = 100µA
VIN = 12V
OUT = 5V
OUT =100µA to 25mA
V
VIN = 12V
OUT = 0V
V
I
V
I
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Power Dissipation
vs. Output Current
Case Temperature (MME)
vs. Output Current
PSRR vs. Frequency
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
40
38
36
34
32
30
28
26
24
30
10
VIN = 12V
OUT = 5V
OUT = 5mA
VIN = 12V
OUT = 4.5V
V
VIN = 12V
OUT = 4.5V
V
I
V
-10
CIN = None
CPSRR = 0.1µF
-30
C
OUT = 10µF
-50
-70
-90
-110
-130
0
5
10
15
20
25
0
5
10
15
20
0.01
0.1
1
10
100
1000 10000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
FREQUENCY (kHz)
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Functional Characteristics
Revision 3.0
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Micrel, Inc.
MIC5281
Functional Characteristics (Continued)
Revision 3.0
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Micrel, Inc.
MIC5281
Functional Diagram
MIC5281 Adjustable Version
MIC5281 Fixed Version
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Functional Description
Output Voltage Setting
The MIC5281 voltage regulator accepts a 6V to 120V
input and has an ultra-low 6µA typical quiescent current
while offering an excellent line transient response and
PSRR. These features make it ideal for harsh, noisy
environments. All options of the device offer 25mA of
output current. The MIC5281YMM and MIC5281YMME
offer an adjustable output voltage from 1.27V to 5.5V.
The MIC5281-3.3YMME and MIC5281-3.3YMM offer
fixed 3.3V outputs and the MIC5281-5.0YMME and
MIC5281-5.0YMM offer fixed 5.0V outputs. The YMME
packaged devices feature a heat slug to more effectively
remove heat from the die.
For the MIC5281YMME and MIC5281YMM, VOUT is
programmed from 1.27V to 5.5V using Equation 1:
R1
R2
VOUT = VREF
×
+1
Eq. 1
where VREF = 1.267V, and R1 and R2 are shown in the
Typical Applications circuit.
Thermal Measurements
Applications Information
It is always wise to measure an IC’s case temperature to
make sure that it is within operating limits, but it is easy to
get erroneous results. The standard thermal couple that
comes with many voltage meters uses a large wire gauge
that behaves like a heat-sink, resulting in artificially low
case temperature measurements. Use a thermocouple of
36-gauge wire or smaller, such as the Omega (5SC-TT-
K-36-36), to minimize the heat-sinking effect. Also, apply
thermal compound to maximize heat transfer between the
IC and the thermocouple.
Thermal Protection
MIC5281 has internal thermal shutdown to protect it from
excessive heating of the die. When the junction
temperature exceeds approximately +155°C, the output is
disabled and the device begins to cool down. The device
turns back on when the junction temperature cools by
15°C. This will result in a cycled output during continuous
thermal-overload conditions.
Current Limit
An infrared thermometer is a recommended alternative.
The IR thermometer from Optris has a 1mm spot size,
ideal for monitoring small surface mount packages. Also,
the optional stand makes it easy to keep the beam on the
IC for long periods of time.
MIC5281 features output current-limit protection. The
output sustains a continuous short circuit to GND without
damage to the device, but thermal shutdown often
results.
Input Capacitor
Connect a 1.0µF capacitor from VIN to GND. Micrel
recommends the C5750X7R2E105M, 1.0µF, 250V
capacitor made by TDK. When using a different
capacitor, assure that the voltage rating of the capacitor
exceeds any potential transient.
CPSRR Capacitor
Connect a 0.1µF capacitor from CPSRR to GND to
maintain high power supply rejection. The voltage rating
of the capacitor must be at least 14V.
Output Capacitor
Connect a 10µF capacitor from VOUT to GND. Assure
that the voltage rating of the capacitor exceeds the
designed output voltage of the MIC5281.
Revision 3.0
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Micrel, Inc.
MIC5281
MIC5281 Evaluation Board Schematic
Bill of Materials
Item Part Number
Manufacturer Description
Qty.
C1
C2
C3
C5750X7R2E105M
TDK(8)
AVX(9)
AVX
1.0µF, 250V, 20%, X7R capacitor (2220)
1
1
1
08053C104KAT2A
0805ZD106KAT2A
0.1µF 25V 20%, X5R capacitor (0805)
10µF, 10V, 20%, X5R, capacitor (0805)
100µF, 160V, 20% capacitor (ALU, 0.492"diameter can 0.197" lead
spacing - Part # ECA-2CM101)
C4
OPEN
Panasonic(10)
0
C5
R1
R2
R3
R4
R5
OPEN
ANY
Capacitor
0
1
1
1
1
1
1
1
CRCW06030000F
CRCW06032942F
CRCW06031002F
CRCW06031822F
CRCW06033012F
CRCW06036982F
MIC5281YMME
Vishay/Dale(11)
Vishay/Dale
Vishay/Dale
Vishay/Dale
Vishay/Dale
Vishay/Dale
Micrel(12)
0Ω, 1% resistor, 0603
29.4kΩ, 1% resistor, 0603
10.0kΩ, 1% resistor, 0603
18.2kΩ, 1%, resistor, 0603
30.1kΩ, 1% resistor chip, 0603
69.8kΩ, 1%, resistor, 0603
120VIN, 25mA, Ultra-Low IQ, High-PSRR Linear Regulator
R6
U1
Notes:
8. TDK: www.tdk.com.
9. AVX: www.avx.com.
10. Panasonic: www.panasonic.com.
11. Vishay: www.vishay.com.
12. Micrel, Inc.: www.micrel.com.
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
PCB Layout Recommendations
Top Layer Silk Screen
Top Layer Traces
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
PCB Layout Recommendations (Continued)
Bottom Layer Traces
Bottom Layer Silk Screen
Revision 3.0
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Micrel, Inc.
MIC5281
PCB Layout Recommendations (Continued)
Evaluation Board Dimensions
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Package Information and Recommended Landing Pattern(13)
8-Pin MSOP
Note:
13. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
Revision 3.0
October 2, 2014
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Micrel, Inc.
MIC5281
Package Information and Recommended Landing Pattern(13) (Continued)
8-Pin Exposed Pad (ePad) MSOP
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2011 Micrel, Incorporated.
Revision 3.0
October 2, 2014
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