MICREL MAQ5281

MAQ5281
120VIN, 25mA, Ultra-Low IQ, High-PSRR
Linear Regulator
Automotive
General Description
Features
The MAQ5281 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
automotive, industrial and telecom, the MAQ5281 offers
±3% initial accuracy, extremely high-power supply
rejection ratio (>90db) and ultra-low quiescent current of
6µA. The MAQ5281 is optimized for high-voltage line
transients, making it ideal for harsh environment
applications.
The MAQ5281 is offered in both fixed output voltage
(3.3V/5.0V) and adjustable output voltage (1.27V to 5.5V)
options.










The MAQ5281 operates over a 40ºC to +125ºC
temperature range and is available in lead-free, RoHScompliant, 8-pin ePad MSOP package. This part is also
AEC-Q100 qualified for automotive applications.
Data sheet and support documentation are found on the
Micrel website: www.micrel.com.
AEC-Q100 qualified
Wide input voltage range: 6V to 120V DC
Ultra-low quiescent current: 6µA (typ)
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 transient rejection (load dump)
High output accuracy:
– ±3% initial accuracy
 Thermal-shutdown and current-limit protection
 Thermally-efficient, 8-pin ePad MSOP package
Applications
 Automotive
 Remote keyless entry power supply
 Telecom applications
___________________________________________________________________________________________________________
Typical Applications
Quiescent Supply Current
vs. Input Voltage
QUIESCENT CURRENT (µA)
12
11
10
9
8
7
6
5
4
3
2
VOUT = 5V
1
IOUT = 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
July 2012
M9999-071112-A
Micrel, Inc.
MAQ5281
Ordering Information
Part Number
Output Voltage
Top Mark
Temperature Range
Package
Lead Finish
Adjustable
7Q1A
–40C to 125C
8-Pin ePad MSOP
Pb-Free
MAQ5281-3.3YMME
3.3V
7Q1S
–40C to 125C
8-Pin ePad MSOP
Pb-Free
MAQ5281-5.0YMME
5.0V
7Q15
–40C to 125C
8-Pin ePad MSOP
Pb-Free
MAQ5281YMME
Pin Configuration
8-Pin ePAD MSOP
MAQ5281-x.xYMME
8-Pin ePAD MSOP
MAQ5281YMME
(TOP VIEW)
(TOP VIEW)
Pin Description
MAQ5281YMME
1
Pin
MAQ5281-x.xYMME
1
2, 3, 7
Name
Function
VIN
Supply Voltage Input. Connect 1µF capacitor from VIN to GND.
2, 3, 7
NC
Not internally connected. Connect NC to GND or leave unconnected.
4
4
CPSRR
5
5
GND
6

FB

6
SNS
8
8
VOUT
Regulator Output. Connect 10µF capacitor from VOUT to GND.
EP
EP
ePad
Exposed Pad (ePad) for Thermal Relief. Connect EP to GND.
July 2012
Bypass Capacitor Connection. Connect 0.1µF capacitor from CPSRR to
GND.
Ground.
Feedback Connection. For external resistor divider to set VOUT.
Sense input. Connect SNS to VOUT.
2
M9999-071112-A
Micrel, Inc.
MAQ5281
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
Power Dissipation (PD) ........................... Internally Limited(3)
Lead Temperature (soldering, 10s).......................... +260°C
Junction Temperature ......................... –40°C  TJ  +125°C
Storage Temperature .........................–65°C  TA  +150°C
ESD Ratings(4)
HBM ......................................................................... 2kV
MM .........................................................................200V
VIN ................................................................. +6V to +120V
VOUT Adjust Range ..................................... +1.27V to +5.5V
Junction Temperature ......................... –40°C  TJ  +125°C
Junction Thermal Resistance (JA)
8-pin ePad MSOP..............................................64°C/W
Electrical Characteristics(5)
VIN = 12V, CIN = 1.0µF, CPSRR = 0.1µF, COUT = 10µF, IOUT = 100µA, TA = 25C, bold values indicate –40C  TJ  +125C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
120
V
11
µA
Power Supply Input
Input Voltage Range(6)
Quiescent Supply Current
6
(7)
IOUT = 0
6
Output Voltage
Adjustable
Output Voltage
1.27
3.2
Fixed 3.3V
Fixed 5.0V
Output Voltage Accuracy
Variation from nominal VOUT
5.5
3.3
3.4
3.13
3.3
3.47
4.85
5.0
5.15
4.75
5.0
5.25
V
3
+3
%
5
+5
%
Load Regulation
IOUT = 100µA to 25mA
1.0
0.2
+1.0
%
Line Regulation(8)
VIN = 10V to 120V
0.5
0.04
+0.5
%/V
1.232
1.270
1.308
1.206
1.270
1.333
Feedback Input (Adjustable)
FB Voltage
FB Current
VFB = 1.27V
3.2
V
nA
Current Limit
Current Limit
VOUT = 0V
30
65
130
mA
Ripple Rejection
Power Supply Rejection Ratio
July 2012
f = 20kHz to 2MHz
90
3
dB
M9999-071112-A
Micrel, Inc.
MAQ5281
Electrical Characteristics(5) (Continued)
VIN = 12V, CIN = 1.0µF, CPSRR = 0.1µF, COUT = 10µF, IOUT = 100µA, TA = 25C, bold values indicate –40C  TJ  +125C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
2
3
V
Power Dropout Voltage
Dropout Voltage
IOUT = 25mA
Thermal-Shutdown Temperature
TJ rising
Thermal-Shutdown Hysteresis
157
C
15
C
Notes:
1.
Exceeding the 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.
Quiescent current is specified for the adjustable option. Fixed output options will add approximately 1µA due to the internal feedback resistors.
8.
Line regulation is a percentage of VOUT.
July 2012
4
M9999-071112-A
Micrel, Inc.
MAQ5281
Typical Characteristics
11.0
11.0
IOUT = 0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
9.0
IOUT = 0mA
8.0
7.0
6.0
5.0
4.0
3.0
2.0
40
60
80
100
120
-25
0
50
75
100
0
125
OUTPUT VOLTAGE (V)
5.10
5.05
5.00
4.95
4.90
IOUT = 5mA
5.05
5.00
4.95
4.90
4.80
4.80
-50
25
-25
OUTPUT CURRENT (mA)
0
25
50
75
100
2.1
2.0
1.9
1.8
1.7
50
75
TEMPERATURE (°C)
July 2012
100
125
20
4.5
VOUT = 5V
IOUT = 5mA
4.0
VFB = 1.267V
1.29
1.28
1.27
1.26
25
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1.23
1.4
15
VOUT = 5V
1.24
1.5
10
FB Current
vs. Input Voltage
1.25
25
5
OUTPUT CURRENT (mA)
1.6
0
0.50
0
FB CURRENT (nA)
FB VOLTAGE (V)
IOUT = 25mA
-25
1.00
5.0
1.30
VOUT = 5V
-50
1.50
125
1.31
2.2
120
2.00
FB Voltage
vs. Input Voltage
Dropout Voltage
vs. Temperature
2.3
100
VOUT = 5V
ADJUSTABLE OPTION
2.50
TEMPERATURE (°C)
2.4
80
0.00
4.75
20
60
Dropout Voltage
vs. Output Current
VOUT = 5V
5.10
4.85
15
40
3.00
5.15
4.85
10
20
INPUT VOLTAGE (V)
VIN = 12V
5.20
4.75
DROPOUT VOLTAGE (V)
25
5.25
VOUT = 5V
5
4.95
Output Voltage
vs. Temperature
VIN = 12V
0
5.00
TEMPERATURE (°C)
5.25
5.15
5.05
4.85
-50
Output Voltage
vs. Output Current
5.20
IOUT = 5mA
4.90
DROPOUT VOLTAGE (V)
20
VOUT = 5V
5.10
1.0
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
VIN = 12V
VOUT = 5V
0.0
0
Output Voltage
vs. Input Voltage
5.15
VIN = 12V
10.0
VOUT = 5V
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
10.0
Quiescent Supply Current
vs. Temperature
OUTPUT VOLTAGE (V)
Quiescent Supply Current
vs. Input Voltage
0.0
0
20
40
60
80
INPUT VOLTAGE (V)
5
100
120
0
20
40
60
80
100
120
INPUT VOLTAGE (V)
M9999-071112-A
Micrel, Inc.
MAQ5281
Typical Characteristics (Continued)
1.30
VOUT = 5V
1.276
IOUT = 5mA
1.29
1.28
1.27
1.26
VIN = 12V
VIN = 12V
2.0
FB CURRENT (nA)
FB VOLTAGE (V)
2.5
VIN = 12V
VOUT = 5.0V
1.274
VFB = 1.267V
FB VOLTAGE (V)
1.31
FB Voltage
vs. Output Current
FB Current
vs. Temperature
FB Voltage
vs. Temperature
IOUT = 0
1.5
1.0
1.272
1.270
1.268
0.5
1.25
1.24
1.266
0.0
-50
-25
0
25
50
75
100
-50
125
-25
0
TEMPERATURE (°C)
75
100
0
125
VOUT = 0V
70
65
60
55
VOUT = 5V
IOUT = 100µA
0.30
0.25
0.20
0.15
0.10
0.05
-50
-25
0
25
50
75
100
25
50
75
100
Power Dissipation
vs. Output Current
Case Temperature (MME)
vs. Output Current
V OUT = 4.5V
0.14
0.12
0.10
0.08
0.06
125
0.28
VIN = 12V
0.26
VOUT = 5V
IOUT =100µA to 25mA
0.24
0.22
0.20
0.18
0.16
0.14
-50
V OUT = 4.5V
36
-10
34
-30
32
30
-50
0.02
-110
0.00
24
10
15
20
OUTPUT CURRENT (mA)
25
0
5
75
100
125
10
15
20
OUTPUT CURRENT (mA)
25
VOUT = 5V
IOUT = 5mA
CIN = None
CPSRR = 0.1µF
COUT = 10µF
-70
-90
5
50
VIN = 12V
10
26
0
25
30
28
0.04
0
PSRR vs. Frequency
V IN = 12V
38
-25
TEMPERATURE (°C)
PSRR (dB)
CASE TEMPERATURE (°C)
V IN = 12V
0.16
0
TEMPERATURE (°C)
40
0.18
-25
TEMPERATURE (°C)
0.20
25
0.10
-50
125
20
0.12
0.00
50
15
0.30
VIN = 10V to 120V
0.35
LOAD REGULATION (%)
LINE REGULATION (%/V)
VIN = 12V
10
Load Regulation
vs. Temperature
0.40
75
5
OUTPUT CURRENT (mA)
Line Regulation
vs. Temperature
80
CURRENT LIMIT (mA)
50
TEMPERATURE (°C)
Current Limit
vs. Temperature
POWER DISSIPATION (W)
25
-130
0.01
0.1
1
10
100
1000
10000
FREQUENCY (kHz)
Case Temperature*: The temperature measurement was taken at the hottest point on the MAQ5282 case mounted on a 2.25 square inch PCB at an
ambient temperature of 25°C; see “Thermal Measurement” section. Actual results will depend upon the size of the PCB, ambient temperature and
proximity to other heat emitting components.
July 2012
6
M9999-071112-A
Micrel, Inc.
MAQ5281
Functional Characteristics
July 2012
7
M9999-071112-A
Micrel, Inc.
MAQ5281
Functional Characteristics (Continued)
July 2012
8
M9999-071112-A
Micrel, Inc.
MAQ5281
Detailed Description
The MAQ5281 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 MAQ5281YMME offer an adjustable
output voltage from 1.27V to 5.5V. The MAQ52813.3YMME offer fixed 3.3V outputs and the MAQ52815.0YMME offer fixed 5.0V outputs. The YMME packaged
devices feature a heat slug to more effectively remove
heat from the die.
Applications Information
Thermal Protection
The MAQ5281 has an internal thermal shutdown circuit 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
The MAQ5281 features output current-limit protection. The
output sustains a continuous short circuit to GND without
damage to the device, but thermal shutdown often results.
Output Voltage Setting
For the MAQ5281YMME, VOUT is programmed from 1.27V
to 5.5V using:
 R1 
VOUT  VREF  
 1
 R2 
where VREF = 1.27V, and R1 and R2 are shown in the
Typical Applications circuit.
Thermal Measurements
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 thermocouple 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-K36-36), to minimize the heat-sinking effect. Also, apply
thermal compound to maximize heat transfer between the
IC and the thermocouple.
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.
Input Capacitor
Connect a 1µF capacitor from VIN to GND. Micrel
recommends the C5750X7R2E105M, 1µF, 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 MAQ5281.
July 2012
9
M9999-071112-A
Micrel, Inc.
MAQ5281
Functional Diagram
July 2012
10
M9999-071112-A
Micrel, Inc.
MAQ5281
MAQ5281 Evaluation Board Schematic
MAQ5281 Evaluation Board Schematic
July 2012
11
M9999-071112-A
Micrel, Inc.
MAQ5281
Bill of Materials
Item
C1
Part Number
C5750X7R2E105
M
C2
08053C104KAT2A
C3
0805ZD106KAT2A
C4, C5
Manufacturer
Description
Qty.
(1)
1.0µF, 250V, 20%, X7R capacitor (2220)
(2)
0.1µF 25V 20%, X5R capacitor (0805)
1
10µF, 10V, 20%, X5R, capacitor (0805)
1
TDK
AVX
AVX
OPEN
R1
CRCW06030000F
R2
CRCW06032942F
R3
R4
1
0
(3)
0, 1% resistor, 0603
1
Vishay/Dale
29.4k, 1% resistor, 0603
1
CRCW06031002F
Vishay/Dale
10.0k, 1% resistor, 0603
1
CRCW06031822F
Vishay/Dale
18.2k, 1%, resistor, 0603
1
R5
CRCW06033012F
Vishay/Dale
30.1k, 1% resistor chip, 0603
1
R6
CRCW06036982F
Vishay/Dale
69.8k, 1%, resistor, 0603
1
120VIN, 25mA, Ultra-Low IQ, High-PSRR Linear Regulator
1
U1
MAQ5281YMME
Vishay/Dale
Micrel
(4)
Notes:
1. TDK: www.tdk.com.
2. AVX.: www.avx.com.
3. Vishay Tel: www.vishay.com.
4. Micrel, Inc.: www.micrel.com.
July 2012
12
M9999-071112-A
Micrel, Inc.
MAQ5281
PCB Evaluation Board Layout
Top Layer Silk Screen
Top Layer Traces
July 2012
13
M9999-071112-A
Micrel, Inc.
MAQ5281
PCB Evaluation Board Layout (Continued)
Bottom Layer Traces
Bottom Layer Silk Screen
July 2012
14
M9999-071112-A
Micrel, Inc.
MAQ5281
PCB Evaluation Board Layout (Continued)
EV Board Dimensions
July 2012
15
M9999-071112-A
Micrel, Inc.
MAQ5281
Package Information
8-Pin Exposed Pad (ePad) MSOP (MME)
July 2012
16
M9999-071112-A
Micrel, Inc.
MAQ5281
Recommended Landing Pattern
8-Pin Exposed Pad (ePad) MSOP (MME)
Red circle indicates Thermal Via. Size should be .300mm  .350mm in diameter, 1.00mm pitch, and it should be
connected to GND plane for maximum thermal performance.
July 2012
17
M9999-071112-A
Micrel, Inc.
MAQ5281
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.
© 2012 Micrel, Incorporated.
July 2012
18
M9999-071112-A