MIC5281
120V
IN
, 25mA, Ultra-Low IQ, High-PSRR
Linear Regulator
General Description
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
temperature range and is available in lead-free, RoHS-
compliant, 8-pin ePad MSOP, and 8-pin MSOP packages
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
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:
−
Thermally-efficient, 8-pin MSOP, and 8-pin ePad
MSOP packages
Applications
•
•
•
•
Industrial applications
Remote keyless entry power supply
Telecom applications
Off-line power supplies
Typical Application
Quiescent Supply Current
vs. Input Voltage
V
OUT
= 5V
I
OUT
= 0
11.0
QUIESCENT CURRENT (µA)
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
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
October 2, 2014
Revision 3.0
Micrel, Inc.
MIC5281
Ordering Information
Part Number
MIC5281YMME
MIC5281-3.3YMME
MIC5281-5.0YMME
MIC5281YMM
MIC5281-3.3YMM
MIC5281-5.0YMM
Output Voltage
Adjustable
3.3V
5.0V
Adjustable
3.3V
5.0V
Top Mark
781A
781S
7815
5281
YMM
5281
3.3Y
5281
5.0Y
Temperature Range
–40°C to
+125°C
–40°C to
+125°C
–40°C to
+125°C
–40°C to
+125°C
–40°C to
+125°C
–40°C to
+125°C
Package
8-Pin ePad MSOP
8-Pin ePad MSOP
8-Pin ePad MSOP
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
8-Pin ePAD MSOP
MIC5281-x.xYMME
(TOP VIEW)
8-Pin MSOP
MIC5281-x.xYMM
(TOP VIEW)
8-Pin ePAD MSOP
MIC5281YMME
(TOP VIEW)
8-Pin MSOP
MIC5281YMM
(TOP VIEW)
October 2, 2014
2
Revision 3.0
Micrel, Inc.
MIC5281
Pin Description
Pin
MIC5281YMME
1
2, 3, 7
MIC5281-x.xYMME
1
2, 3, 7
MIC5281YMM
1
2, 3, 7
MIC5281-x.xYMM
1
2, 3, 7
Name
VIN
NC
Function
Supply Voltage Input. Connect 1µF
capacitor from VIN to GND.
Not internally connected. Connect
NC to GND or leave unconnected.
Bypass Capacitor Connection.
Connect 0.1µF capacitor from
CPSRR to GND.
Ground.
Feedback Connection. For external
resistor divider to set V
OUT
.
Sense input. Connect SNS to
VOUT.
Regulator Output. Connect 10µF
capacitor from VOUT to GND.
Exposed Pad (ePad) for Thermal
Relief. Connect EP to GND.
4
5
6
−
8
EP
4
5
−
6
8
EP
4
5
6
−
8
−
4
5
−
6
8
−
CPSRR
GND
FB
SNS
VOUT
EP
October 2, 2014
3
Revision 3.0
Micrel, Inc.
MIC5281
Absolute Maximum Ratings
(1)
V
IN
to GND................................................... –0.3V to +125V
V
CPSRR
to GND ..................................................–0.3 to +14V
V
FB
, V
SNS
, V
OUT
to GND ................................... –0.3V to +6V
Lead Temperature (soldering, 10s) .......................... +260°C
Junction Temperature ......................... –40°C
≤
T
J
≤
+125°C
Storage Temperature .........................–65°C
≤
T
A
≤
+150°C
ESD Ratings
(4)
HBM ......................................................................... 2kV
MM ......................................................................... 200V
Operating Ratings
(2)
V
IN
................................................................. +6V to +120V
V
OUT
Adjust Range ..................................... +1.27V to +5.5V
Junction Temperature ......................... –40°C
≤
T
J
≤
+125°C
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Junction Thermal Resistance (θ
JA
)
8-pin ePad MSOP .............................................. 64°C/W
8-pin MSOP ..................................................... 160°C/W
Electrical Characteristics
(5)
V
IN
= 12V, C
IN
= 1.0µF, C
PSRR
= 0.1µF, C
OUT
= 10µF, V
OUT
= 5.0V or 3.3V, I
OUT
= 100µA, T
A
= 25°C,
bold
values indicate
–40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Power Supply Input
Input Voltage Range
(6)
Quiescent Supply Current
Output Voltage
Adjustable
Fixed 3.3V
1.27
3.2
3.13
4.85
4.75
−3
−5
−1.0
−0.5
0.2
0.04
3.3
3.3
5.0
5.0
5.5
3.4
3.47
5.15
5.25
+3
+5
+1.0
+0.5
%
%
%
%
V
I
OUT
= 0
6
6
120
11
V
µA
Condition
Min.
Typ.
Max.
Units
Output Voltage
Fixed 5.0V
Output Voltage Accuracy
Load Regulation
Line Regulation
(7)
Feedback Input (Adjustable)
FB Voltage
FB Current
Current Limit
Current Limit
Ripple Rejection
Power Supply Rejection Ratio
Notes:
Variation from nominal V
OUT
I
OUT
= 100µA to 25mA
V
IN
= 10V to 120V
1.232
1.206
V
FB
= 1.27V
1.270
1.270
3.2
1.308
1.333
V
nA
V
OUT
= 0V
30
65
130
mA
f = 20kHz to 2MHz
90
dB
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 T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. 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 V
IN
≥
(V
OUT
+ 3V) and V
IN
≥
6V.
7. Line regulation is a percentage of V
OUT
.
October 2, 2014
4
Revision 3.0
Micrel, Inc.
MIC5281
Electrical Characteristics
(5)
(Continued)
V
IN
= 12V, C
IN
= 1.0µF, C
PSRR
= 0.1µF, C
OUT
= 10µF, V
OUT
= 5.0V or 3.3V, I
OUT
= 100µA, T
A
= 25°C,
bold
values indicate
–40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Power Dropout Voltage
Dropout Voltage
Thermal Protection
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
J
rising
157
15
°C
°C
I
OUT
= 25mA
2
3
V
Condition
Min.
Typ.
Max.
Units
October 2, 2014
5
Revision 3.0
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