MIC5280
25mA, 120V, Low I
Q
, High PSRR LDO
General Description
The MIC5280 is a high performance low dropout regulator,
offering a very low noise output with a very wide input
voltage operating range, up to 120V DC input voltage.
Ideal for high input voltage applications such as industrial
and telecom, the MIC5280 offers 2% initial accuracy,
extremely high power supply rejection ratio (PSRR >
80dB) and low ground current (typically 31µA). The
MIC5280 can also be put into a zero-off-mode current
state, drawing a minuscule amount of current when
disabled.
The MIC5280 has a very wide input voltage range, with a
DC rating from –24V to 120V. The MIC5280 is optimized
for line transient response, making it ideal for harsh
environment applications.
The MIC5280 has an operating junction temperature range
of –40°C to +125°C and is available in an adjustable
output voltage version in a lead-free (RoHS compliant) 8-
pin EPAD SOIC packaging.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
Wide input voltage range: 4.5V to 120V DC
Very low quiescent current: 31µA typical
25mA guaranteed output current
Adjustable output from 1.215V to 5V
DC voltage protection down to -24V
Ability to withstand up to +120V DC at the input
Stable with ceramic output capacitors
Ultra High PSRR > 80dB for RF applications
High output accuracy
– ± 2% initial accuracy
– ± 3% over temperature (–40°C to +125°C)
•
Thermal shutdown and current limit protection
•
Thermally efficient 8-pin EPAD SOIC package
Applications
•
Industrial applications
•
Remote keyless entry power supply
•
Telecom applications
•
Off-line power supplies
___________________________________________________________________________________________________________
Typical Application
Telecom Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2009
M9999-012209-A
Micrel, Inc.
MIC5280
Ordering Information
Part Number
MIC5280YME
Voltage
Adj.
Temperature Range
–40° to +125°C
Package
8-Pin EPAD SOIC
Lead Finish
Pb-Free
Pin Configuration
CBYP
VOUT
ADJ
GND
1
2
3
4
8 VIN
7 NC
6 NC
5 EN
8-Pin EPAD SOIC (ME)
Pin Description
Pin Number
1
2
3
4
5
6, 7
8
EP
Pin Name
CBYP
VOUT
ADJ
GND
EN
NC
VIN
–
Pin Function
Connect 10µF capacitor. Increases PSRR when VIN
≥
6.5V.
Regulator Output Pin. Connect 2.2µF for better stable operation.
Connect pin 3 to external resistor divider to set VOUT.
Ground.
Enable pin. Enable Low turns part OFF, Enable High turns part ON.
Not internally connected.
Supply Input pin. Supply (Input): -24V to 120V input voltage.
Exposed Pad – Connect to Ground plane trace.
January 2009
2
M9999-012209-A
Micrel, Inc.
MIC5280
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ..................................... –24V to +120V
Enable Voltage (V
EN
)...................................... –1V to +120V
(3)
Power Dissipation (P
D
) ........................... Internally Limited
Max Reflow Temperature (per IPC/JEDEC 20°C) ..... 260°C
Junction Temperature (T
J
) ........................ –40°C to +150°C
Storage Temperature (T
S
)......................... –65°C to +150°C
(4)
ESD Rating .................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) ...................................... 4.5V to +120V
Enable Voltage (V
EN
)........................................ 0V to +120V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
EPAD SOIC-8 (θ
JA
) ............................................41°C/W
Electrical Characteristics
(5)
V
IN
= 12V; V
EN
= 2V; C
OUT
= 2.2µF; C
BYP
= 10µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to +125°C, unless
noted.
Parameter
Output Voltage Accuracy
ADJ Pin Voltage
Line Regulation
(6)
(7)
Condition
Variation from nominal V
OUT
Variation from nominal V
OUT
, –40°C to +125°C
ΔV
IN
= 6.5V to 120V
I
OUT
= 100µA to 25mA
I
OUT
= 100µA; V
IN
= 4.5V; Adjust Pin = 0V
I
OUT
= 10mA; V
IN
= 4.5V; Adjust Pin = 0V
I
OUT
= 25mA; V
IN
= 4.5V; Adjust Pin = 0V
Min
–2
–3
Typ
Max
+2
+3
Units
%
%
V
%
%
mV
mV
mV
µA
µA
µA
µA
dB
mA
1.219
–0.5
–0.5
0
0
0
0
0
0
0
80
40
0.4
70
70
0.03
3
3.3
120
Logic Low
Logic High
2.0
0
0
0
0.1
0.02
0.12
0.15
1
1
1
10
V
EN
≤
0.3V; V
IN
= 12V
V
EN
≥
2.0V; V
IN
= 12V
V
IN
= 4.5V; V
EN
= 120V
0.3
100
50
10
0.04
0.2
430
800
1100
31
260
0.02
0.5
0.5
700
1000
1500
50
400
1
5
Load Regulation
Dropout Voltage
Ground Pin Current
Ground Pin Current in Shutdown
Ripple Rejection
Current Limit
I
DD
Reverse Battery
I
OUT
Reverse Current
ADJ Pin Current
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
I
OUT
= 100µA
I
OUT
= 25mA
V
EN
≤
0.3V
V
EN
≤
0.3V, –40°C to +125°C
f = up to 1kHz
V
OUT
= 0V; V
IN
= 4.5V
V
OUT
= 0V; V
IN
= 14.4V
V
IN
= –24V; V
EN
= 0.3V
V
IN
= 0V; V
OUT
= 5V; V
EN
= 0.3V
mA
µA
µA
nA
µV
RMS
V
V
µA
µA
µA
ms
Turn-on Time
C
OUT
= 2.2µF; I
OUT
= 25mA
January 2009
3
M9999-012209-A
Micrel, Inc.
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
MIC5280
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5. Specification for packaged product only.
6. Line regulation is a percentage of V
OUT
.
7. Regulation is measured at constant junction temperature using low duty cycle pulse testing; changes in output voltage due to heating effects are
covered by the thermal regulation specification.
January 2009
4
M9999-012209-A
Micrel, Inc.
MIC5280
Typical Characteristics
120
100
80
60
40
20
0
10
100
1000 10000 100000
FREQUENCY (Hz)
10mA
25mA
1mA
Power Supply
Rejection Ratio
100µA
3.155
3.154
3.153
3.152
3.151
3.150
3.149
3.148
3.147
3.146
3.145
0
Output Voltage
vs. Input Voltage
5.010
5.008
5.006
5.004
5.002
5.000
4.998
4.996
4.994
4.992
4.990
0
Output Voltage
vs. Load Current
EN = V
BYP
V
IN
= 12V
V
OUT
= 5V
C
IN
= 0.18µF
C
OUT
= 2.2µF
V
OUT
= 3.15V
C
IN
= 0.18µF
C
OUT
= 2.2µF
Load = 100µA
20
40 60 80 100 120
INPUT VOLTAGE (V)
5
10
15
20
LOAD CURRENT (mA)
25
1.225
1.224
1.223
1.222
1.221
1.220
1.219
1.218
1.217
1.216
Feedback Voltage
vs. Temperature
300
250
Ground Current
vs. Output Current
35
32
29
26
23
Ground Current
vs. Temperature
V
IN
=120V
–40°C
Load=100µA
V
IN
=12V
200
150
120°C
25°C
V
IN
= 12V
V
OUT
= 5V
C
IN
= 0.18µF
C
OUT
= 2.2µF
Load=25mA
V
IN
=4.5V
100
50
0
0
1.215
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5
10
15
20
25
OUTPUT CURRENT (mA)
20
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
EN = V
IN
Load = 100µA
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Dropout Voltage
vs. Output Current
V
IN
= 4.5V
C
IN
= 0.18µF
C
OUT
= 2.2µF
5
10
15
20
25
OUTPUT CURRENT (mA)
1.2
1.1
Load=25mA
1.0
0.9
0.8
Load=10mA
0.7
0.6
0.5
0.4
0.3
Load=100µA
0.2
0.1
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
79
76
73
70
67
64
61
58
55
0
Current Limit
vs. Input Voltage
V
OUT
= 3.15V
C
OUT
= 2.2µF
20
40 60 80 100 120
INPUT VOLTAGE (V)
80
77
74
71
68
65
62
59
56
53
Current Limit
vs. Temperature
3.40
3.37
3.34
3.31
3.28
3.25
3.22
3.19
3.16
3.13
Adjust Pin Current
vs. Temperature
1.1
1.0
0.9
0.8
0.7
0.6
0.5
Enable Threshold
vs. Temperature
Load = 100µA
V
IN
=12V
V
IN
=4.5V
50
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3.10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
EN
= 12V
0.4
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
January 2009
5
M9999-012209-A
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