MIC5280YME-TR [MICROCHIP]
IC REG LDO ADJ 25MA 8SOIC;
| 型号： | MIC5280YME-TR |
| 厂家： | 
MICROCHIP |
| 描述： | IC REG LDO ADJ 25MA 8SOIC 光电二极管 输出元件 调节器 |
| 文件： | 总14页 (文件大小：255K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5280
25mA, 120V, Low IQ, High PSRR LDO
General Description
Features
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.
• Wide input voltage range: 4.5V to 120V DC
• Very low quiescent current: 31µA typical
• 25mA guaranteed output current
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.
• 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
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.
– ± 2% initial accuracy
– ± 3% over temperature (–40°C to +125°C)
• Thermal shutdown and current limit protection
• Thermally efficient 8-pin EPAD SOIC package
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.
Applications
• Industrial applications
• Remote keyless entry power supply
• Telecom applications
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• 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
M9999-012209-A
January 2009
Micrel, Inc.
MIC5280
Ordering Information
Part Number
Voltage
Temperature Range
Package
Lead Finish
MIC5280YME
Adj.
–40° to +125°C
8-Pin EPAD SOIC
Pb-Free
Pin Configuration
CBYP
1
2
3
4
8
7
6
5
VIN
VOUT
ADJ
NC
NC
EN
GND
8-Pin EPAD SOIC (ME)
Pin Description
Pin Number
Pin Name
Pin Function
1
2
CBYP
VOUT
ADJ
GND
EN
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.
3
4
5
Enable pin. Enable Low turns part OFF, Enable High turns part ON.
Not internally connected.
6, 7
8
NC
VIN
–
Supply Input pin. Supply (Input): -24V to 120V input voltage.
Exposed Pad – Connect to Ground plane trace.
EP
M9999-012209-A
January 2009
2
Micrel, Inc.
MIC5280
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN)..................................... –24V to +120V
Enable Voltage (VEN)...................................... –1V to +120V
Power Dissipation (PD)...........................Internally Limited(3)
Max Reflow Temperature (per IPC/JEDEC 20°C) ..... 260°C
Junction Temperature (TJ) ........................–40°C to +150°C
Storage Temperature (TS).........................–65°C to +150°C
ESD Rating(4)..................................................................2kV
Supply Voltage (VIN)...................................... 4.5V to +120V
Enable Voltage (VEN)........................................ 0V to +120V
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
EPAD SOIC-8 (θJA)............................................41°C/W
Electrical Characteristics(5)
VIN = 12V; VEN = 2V; COUT = 2.2µF; CBYP = 10µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless
noted.
Parameter
Condition
Min
–2
Typ
Max
+2
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT, –40°C to +125°C
–3
+3
%
ADJ Pin Voltage
Line Regulation(6)
Load Regulation(7)
Dropout Voltage
1.219
0.04
0.2
V
–0.5
0.5
0.5
700
1000
1500
50
ΔVIN = 6.5V to 120V
%
–0.5
0
IOUT = 100µA to 25mA
%
IOUT = 100µA; VIN = 4.5V; Adjust Pin = 0V
IOUT = 10mA; VIN = 4.5V; Adjust Pin = 0V
IOUT = 25mA; VIN = 4.5V; Adjust Pin = 0V
IOUT = 100µA
430
800
1100
31
mV
mV
mV
µA
µA
µA
µA
dB
mA
mA
µA
µA
nA
0
0
Ground Pin Current
0
400
1
IOUT = 25mA
0
260
0.02
Ground Pin Current in Shutdown
VEN ≤ 0.3V
0
5
VEN ≤ 0.3V, –40°C to +125°C
0
Ripple Rejection
Current Limit
f = up to 1kHz
80
70
VOUT = 0V; VIN = 4.5V
40
VOUT = 0V; VIN = 14.4V
70
100
50
IDD Reverse Battery
IOUT Reverse Current
ADJ Pin Current
VIN = –24V; VEN = 0.3V
0.4
0.03
3
VIN = 0V; VOUT = 5V; VEN = 0.3V
10
3.3
120
Output Voltage Noise
Enable Input
µVRMS
0.3
Enable Input Voltage
Logic Low
V
2.0
0
Logic High
V
1
1
Enable Input Current
Turn-on Time
VEN ≤ 0.3V; VIN = 12V
VEN ≥ 2.0V; VIN = 12V
VIN = 4.5V; VEN = 120V
COUT = 2.2µF; IOUT = 25mA
0.02
0.12
0.15
1
µA
µA
µA
ms
0
10
0
0.1
M9999-012209-A
January 2009
3
Micrel, Inc.
MIC5280
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 of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. 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 VOUT
.
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.
M9999-012209-A
January 2009
4
Micrel, Inc.
MIC5280
Typical Characteristics
Power Supply
Output Voltage
Output Voltage
Rejection Ratio
vs. Input Voltage
vs. Load Current
120
3.155
3.154
3.153
3.152
3.151
3.150
3.149
3.148
3.147
3.146
3.145
5.010
5.008
5.006
5.004
5.002
5.000
4.998
4.996
4.994
4.992
4.990
EN = VBYP
VIN = 12V
VOUT = 5V
CIN = 0.18µF
COUT = 2.2µF
100µA
100
80
60
40
20
0
1mA
10mA
25mA
VOUT = 3.15V
CIN = 0.18µF
COUT = 2.2µF
Load = 100µA
0
5
10
15
20
25
10
100
1000 10000 100000
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
FREQUENCY (Hz)
Feedback Voltage
vs. Temperature
Ground Current
vs. Output Current
Ground Current
vs. Temperature
1.225
1.224
1.223
1.222
1.221
1.220
1.219
1.218
1.217
1.216
1.215
300
250
200
150
100
50
35
32
29
26
23
20
VIN=120V
VIN=12V
–40°C
120°C
25°C
Load=100µA
Load=25mA
VIN=4.5V
VIN = 12V
VOUT = 5V
CIN = 0.18µF
COUT = 2.2µF
EN = VIN
Load = 100µA
0
-40 -20
0 20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
0
5
10
15
20
25
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
Current Limit
vs. Input Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
79
76
73
70
67
64
61
58
55
Load=25mA
Load=10mA
Load=100µA
VIN = 4.5V
CIN = 0.18µF
COUT = 2.2µF
VOUT = 3.15V
COUT = 2.2µF
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
0
5
10
15
20
25
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Current Limit
vs. Temperature
Adjust Pin Current
vs. Temperature
Enable Threshold
vs. Temperature
80
77
74
71
68
65
62
59
56
53
50
3.40
3.37
3.34
3.31
3.28
3.25
3.22
3.19
3.16
3.13
3.10
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
Load = 100µA
VIN=12V
VIN=4.5V
VEN = 12V
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
M9999-012209-A
January 2009
5
Micrel, Inc.
MIC5280
Typical Characteristics (continued)
Enable Current
vs. Enable Voltage
Enable Current
vs. Temperature
Low Voltage Behavior
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
0.135
6.5
5.5
4.5
3.5
2.5
1.5
0.133
0.131
0.129
0.127
0.125
0.123
0.121
0.119
0.117
0.115
VIN=12V
Load=100µA
Load=10mA
VIN=120V
VOUT = 5V
COUT = 2.2µF
0.5
0
VIN = 12V
1.5
2.5
3.5
4.5
5.5
6.5
0
20 40 60 80 100 120
ENABLE VOLTAGE (V)
-40 -20 0 20 40 60 80 100 120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
V
Current
Output Noise
IN
vs. Input Voltage
Spectral Density
Noise(10Hz to 100kHz)=113µV
70
60
50
40
30
20
10
0
10
1
RMS
VIN = 3.6V
V
OUT = 3.3V
COUT = 2.2µF
CBYP = 0.1µF
Load = 25mA
0.1
VOUT = 1.2V
CIN = 0.18µF
COUT = 2.2µF
IOUT = 0A
0.01
0
24 48 72 96 120
INPUT VOLTAGE (V)
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
M9999-012209-A
January 2009
6
Micrel, Inc.
MIC5280
Functional Characteristics
M9999-012209-A
January 2009
7
Micrel, Inc.
MIC5280
Functional Diagram
VIN
EN >
Bypass Regulator
+
< EN
Post Regulator
1.2V
CBYP
EN >
1.22V
Enable
EN
EN
VOUT
ADJ
EN >
EN >
GND
M9999-012209-A
January 2009
8
Micrel, Inc.
MIC5280
EN Pin
Functional Description
EN pin is a logic level enable input which turns MIC5280
on/off. Drive EN pin level high to turn the device ON and
drive EN pin low to keep the device in shutdown mode.
In shutdown mode the MIC5280 draws typically 20nA
from the input supply. EN pin can withstand 120V,
allowing EN always connected to input supply for
always-ON operation.
MIC5280 is a high performance linear regulator which
accepts wide input operating range 4.5V to 120V. This
allows the use in harsh environments. The input can
surge from 0V to 120V within a millisecond. The first
stage bypass regulator isolates output from this input by
producing an intermediate head voltage which is a input-
to-post regulator. This post regulator gives the control to
regulate the required output voltage. The output voltage
is adjustable from 1.22V to 5V.
ADJ Pin
ADJ pin gives the flexibility to set the output voltage to
the requirement from 1.22V to 5V. Use a resistor divider
from output and connect to ADJ pin, internal reference is
typically 1.219V.
VIN Pin
VIN pin is the supply input pin. A 0.18µF or larger
capacitor with proper voltage rating is recommended for
filtering the input voltage variations and noise on the
input voltage. This capacitor should be close to the VIN
and GND pins.
GND Pin
This GND pin provides the ground for all the electrical
connections. MIC5280 has exposed pad underneath the
package which should be connected to ground. If this
exposed pad is connected to wide ground plane it would
improve the thermal performance of MIC5280.
CBYP Pin
The Bypass pin is the output of the Bypass regulator and
the input of the post regulator. By connecting a capacitor
from the CBYP pin-to-GND, a greater stability and a much
higher PSRR is achieved. A 10µF ceramic capacitor is
recommended and this significantly decreases VOUT
noise and perturbations due to line transients. When the
MIC5280 is enabled, the Bypass pin voltage is regulated
at 5.5V. To maintain 5.5V regulation and high PSRR, the
VIN must be no lower than 6.5V. For VIN less than 6.5V
while in dropout, the PSRR is reduced.
NC Pins
There are two NC pins on the package which are not
connected internally.
VOUT Pin
The VOUT pin is the regulated output of the post
regulator. When the MIC5280 is enabled, VOUT regulates
at a fixed voltage, when disabled, VOUT is high
impedance. A 2.2µF or larger ceramic capacitor must be
connected to VOUT pin-to-ground.
M9999-012209-A
January 2009
9
Micrel, Inc.
MIC5280
PSRR
Application Information
Power Supply Rejection Ratio is the measure of a VOUT
signal caused by a signal on the VIN pin. The ratio of
VIN/VOUT in dB is PSRR. The MIC5280’s PSRR from 0Hz
to 1kHz exceeds 80dB.
MIC5280 is a linear regulator with a wide operating
range of input voltage 4.5V to 120V. The input can go
down to –24V without any damage to the device. This
feature gives the advantage to use in harsh environment
applications such as remote keyless entry and telecom
applications.
Output Voltage Setting
For this adjustable regulator, VOUT is programmable from
1.22V to 5.0V. A 2.2µF or larger capacitor must be
connected to VOUT pin-to-ground to maintain stability.
This capacitor value can be increased without bound.
The VOUT capacitor can have an ESR of 0Ω. When VIN is
lower than VOUT, VOUT is not pulled low by VIN. A small
current, typically 4µA, will sink into VOUT pin.
Thermal Protection
MIC5280 has internal thermal shutdown to protect from
over dissipation and failure. When the junction
temperature exceeds +160°C, an internal thermal sensor
signals the shutdown logic to turn off the pass transistor
and allows the IC to cool. The thermal sensor turns the
pass transistor on again after the junction temperature
cools by 10°C. This results in a cycled output during
continuous thermal overload conditions. The recovery
from thermal shutdown is smooth without any overshoot.
For continuous operation, do not exceed the maximum
junction temperature rating of +125°C.
The output voltage is controlled by the feedback
resistors (R1 and R2) and can be calculated as follows:
R1
R2
⎛
⎜
⎞
VOUT = VREF
⋅
+ 1
⎟
⎝
⎠
VREF = 1.219V
The evaluation board is initially adjusted to 5V, but can
easily be modified by removing R1 and replacing it with
the value that yields the desired output voltage.
Current Limit
MIC5280 has a current limit protection to protect it from
over loads. The recovery from current limit protection is
smooth without any overshoots. The output can be
shorted to GND for an indefinite period of time without
damage to the device. During a short circuit, the power
dissipated across the pass transistor can quickly heat
the device. When the die temperature reaches +160°C,
the MIC5280 shut down and automatically restart after
the die temperature cools by 10°C. This results in a
pulsed output operation.
⎛VOUT
⎞
⎜
⎟
− 1
R1 = R2 ⋅
⎜
⎟
VREF
⎝
⎠
Ensure the output voltage selected does not exceed 5V.
Enable Pin
The voltage on enable pin EN of MIC5280 could vary
from –1V to 120V. So enable pin EN of MIC5280 can be
used in a different configuration as the application
dictates.
CBYP Output when Enable is Low
If the MIC5280 needs to be always enabled then simply
connect the EN pin to CBYP pin, as shown in Figure 1.
Then whenever VIN has a supply voltage output is
developed. Input can swing from –24V to 120V.
When the Enable is low and the MIC5280 is disabled,
while VIN voltage is present, the CBYP pin voltage is
typically 4.5V, even for VIN as high as 120V. The Bypass
regulator although maintaining the Bypass voltage,
requires no current from VIN other than leakage current.
One can also connect EN pin through 100kꢀ resistor to
input as shown in Figure 2 to achieve the same result.
Bypass Capacitor
A 10µF capacitor should be connected from bypass pin
to ground to maintain stability of the bypass regulator.
The voltage rating of the capacitor must be 8V or higher.
Low ESR ceramic capacitors work well. Although a 1µF
capacitor maintains good AC power supply rejection,
higher capacitance values will enhance AC power supply
rejection.
M9999-012209-A
January 2009
10
Micrel, Inc.
MIC5280
Figure 1. MIC5280 EN Always Enabled
Figure 2. Enable Connected to VIN Application
M9999-012209-A
January 2009
11
Micrel, Inc.
MIC5280
Bill of Materials
Item
Part Number
Manufacturer
NIC(1)
Description
Qty.
NMC-P1210X7R184K200TRPLPF
C1812C184K2RAC
Capacitor, 0.18µF, 200V, Size 1210
Kemet(2)
Vishay(3)
TDK(4)
AVX(5)
Murata(6)
TDK(4)
Vishay(3)
Murata(6)
Vishay(3)
Vishay(3)
Micrel, Inc.(7)
C1
C2
C3
1
1
1
Capacitor, 0.18µF, 200V, Size 1812
VJ1812Y184KXC
C1608X5R1A225K
Capacitor, 2.2µF,10V, X5R, Size 0603
Capacitor, 2.2µF,6.3V, X7R, Size 0603
Capacitor, 2.2µF,6.3V, X5R, Size 0603
0603C225MAT
GRM188R60J225KE19D
C1608X5R0J105K
Capacitor, 1µF,6.3V, X5R, Size 0603
VJ0603G105KXYPW1BC
GRM188R60J105KA01D
CRCW060315R4FKEYE3
CRCW06034R87FKEYE3
MIC5280YME
R1
R2
U1
Resistor, 15.4k, 1%, 1/16W, Size 0603
Resistor, 4.8k, 1%, 1/16W, Size 0603
25mA, 120V, Low IQ, High PSRR LDO
1
1
1
Notes:
1. NIC: www.nic.com
2. Kemet Electronics: www.ketem.com
3. Vishay: www.vishay.com
4. TDK: www.tdk.com
5. AVX: www.avx.com
6. Murata: www.murata.com
7. Micrel, Inc.: www.micrel.com
M9999-012209-A
January 2009
12
Micrel, Inc.
MIC5280
PCB Layout Recommendations
Top Layer
Bottom Layer
M9999-012209-A
January 2009
13
Micrel, Inc.
MIC5280
Package Information
8-Pin EPAD SOIC (ME)
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
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
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.
© 2008 Micrel, Incorporated.
M9999-012209-A
January 2009
14
相关型号：
©2020 ICPDF网 联系我们和版权申明