MIC5280YMETR - Micrel - Product.Network

MIC5280

25mA, 120V, Low IQ, High PSRR LDO

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

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. MIC5280

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Ordering Information

Part Number Voltage Temperature Range Package Lead Finish

MIC5280YME Adj. –40° to +125°C 8-Pin EPAD SOIC Pb-Free

Pin Configuration

1CBYP

OUT

ADJ

GND

8 VIN

8-Pin EPAD SOIC (ME)

Pin Description

Pin Number Pin Name Pin Function

1 CBYP Connect 10µF capacitor. Increases PSRR when VIN  6.5V.

2 VOUT Regulator Output Pin. Connect 2.2µF for better stable operation.

3 ADJ Connect pin 3 to external resistor divider to set VOUT.

4 GND Ground.

5 EN Enable pin. Enable Low turns part OFF, Enable High turns part ON.

6, 7 NC Not internally connected.

8 VIN Supply Input pin. Supply (Input): -24V to 120V input voltage.

EP – Exposed Pad – Connect to Ground plane trace.

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Absolute Maximum Ratings(1)

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

Operating Ratings(2)

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 Typ Max Units

Variation from nominal VOUT –2 +2 % Output Voltage Accuracy

Variation from nominal VOUT, –40°C to +125°C –3 +3 %

ADJ Pin Voltage 1.219 V

Line Regulation(6) VIN = 6.5V to 120V –0.5 0.04 0.5 %

Load Regulation(7) IOUT = 100µA to 25mA –0.5 0.2 0.5 %

IOUT = 100µA; VIN = 4.5V; Adjust Pin = 0V 0 430 700 mV

IOUT = 10mA; VIN = 4.5V; Adjust Pin = 0V 0 800 1000 mV

Dropout Voltage

IOUT = 25mA; VIN = 4.5V; Adjust Pin = 0V 0 1100 1500 mV

IOUT = 100µA 0 31 50 µA Ground Pin Current

IOUT = 25mA 0 260 400 µA

VEN  0.3V 0 0.02 1 µA Ground Pin Current in Shutdown

VEN  0.3V, –40°C to +125°C 0 5 µA

Ripple Rejection f = up to 1kHz 80 dB

VOUT = 0V; VIN = 4.5V 40 70 mA Current Limit

VOUT = 0V; VIN = 14.4V 70 100 mA

IDD Reverse Battery VIN = –24V; VEN = 0.3V 0.4 0.03 50 µA

IOUT Reverse Current VIN = 0V; VOUT = 5V; VEN = 0.3V 3 10 µA

ADJ Pin Current 3.3 nA

Output Voltage Noise 120 µVRMS

Enable Input

Logic Low 0.3 V Enable Input Voltage

Logic High 2.0 V

VEN  0.3V; VIN = 12V 0 0.02 1 µA

VEN  2.0V; VIN = 12V 0 0.12 1 µA

Enable Input Current

VIN = 4.5V; VEN = 120V 0 0.15 10 µA

Turn-on Time COUT = 2.2µF; IOUT = 25mA 0.1 1 ms

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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, 1.5k 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.

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Typical Characteris t ics

100

120

10 100 1000 10000 100000

FREQUENCY (Hz)

Power Supply

Rejection Ratio

1mA

100µA

25mA

10mA

Output Vo ltage

vs. Input Voltage

3.145

3.146

3.147

3.148

3.149

3.150

3.151

3.152

3.153

3.154

3.155

0406080100120

INPUT VOLTAGE (V)

VOUT = 3.15V

CIN = 0.18µF

COUT = 2.2µF

Load = 100µA

4.990

4.992

4.994

4.996

4.998

5.000

5.002

5.004

5.006

5.008

5.010

0 5 10 15 20 25

LOAD CURRENT (mA)

Output Voltage

vs. Loa d C urrent

EN = VBYP

VIN = 12V

VOUT = 5V

CIN = 0.18µF

COUT = 2.2µF

1.215

1.216

1.217

1.218

1.219

1.220

1.221

1.222

1.223

1.224

1.225

Feedback Voltage

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Load=100µA

Load=25mA

100

150

200

250

300

0 5 10 15 20 25

OUTPUT CURRENT (mA)

Grou nd Cur ren t

vs. Output Current

VIN = 12V

VOUT = 5V

CIN = 0.18µF

COUT = 2.2µF

120°C

–40°C

25°C

Ground C urrent

vs. Te mper ature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

EN = VIN

Load = 100µA

VIN=120V

VIN=12V

VIN=4.5V

0.2

0.4

0.6

0.8

1.2

1.4

0 5 10 15 20 25

OUTPUT CURRENT (mA)

1.0

Dropout Voltage

vs. Output Current

VIN = 4.5V

CIN = 0.18µF

COUT = 2.2µF

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

Drop ou t V ol ta ge

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Load=100µA

Load=10mA

Load=25mA

0 20 40 60 80 100 120

INPUT VOLTAGE (V)

VOUT = 3.15V

COUT = 2.2µF

Current Limit

vs. Input V oltage

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VIN=4.5V

VIN=12V

Current Limit

vs. Temperature

3.10

3.13

3.16

3.19

3.22

3.25

3.28

3.31

3.34

3.37

3.40

Adjust Pin Current

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VEN = 12V

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

Enabl e Th resh old

vs. Te mper ature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Load = 100µA

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Typical Characteris tics (continue d)

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0 20406080100120

ENABLE VOLTAGE (V)

Enable Current

vs. Enable Voltage

VIN = 12V

0.115

0.117

0.119

0.121

0.123

0.125

0.127

0.129

0.131

0.133

0.135

Enable Current

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VIN=12V

VIN=120V

0.5

1.5

2.5

3.5

4.5

5.5

6.5

1.5 2.5 3.5 4.5 5.5 6.5

INPUT VOLTAGE (V)

Low V oltag e B ehavi or

Load=100µA

Load=10mA

VOUT = 5V

COUT = 2.2µF

0 24487296120

INPUT VOLTAGE (V)

VIN Current

vs. Input Voltage

VOUT = 1.2V

CIN = 0.18µF

COUT = 2.2µF

IOUT = 0A

0.01

0.1

Output N oise

Spectral Density

100

FREQUENCY (Hz)

10 1k 10k 1M100k

VIN = 3.6V

VOUT = 3.3V

COUT = 2.2µF

CBYP = 0.1µF

Load = 25mA

Noise(10Hz to 100kHz)=113µVRMS

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Functional Characteristics

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Functional Diagram

Enable

EN EN

< EN

EN >

VIN

EN >

GND

CBYP

VOUT

ADJ

EN >

1.22V

1.2V

Bypass Regulator

Post Regulator

Micrel, Inc. MIC5280

January 2009 9 M9999-012209-A

Functional Description

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.

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.

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.

EN Pin

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.

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.

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.

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.

Micrel, Inc. MIC5280

January 2009 10 M9999-012209-A

Application Information

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.

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.

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.

CBYP Output when Enable is Low

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.

By pa s s Ca p ac i t or

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.

PSRR

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.

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 0. When VIN is

lower than VOUT, VOUT is not pulled low by VIN. A small

current, typically 4µA, will sink into VOUT pin.

The output voltage is controlled by the feedback

resistors (R1 and R2) and can be calculated as follows:

⎟

⎠

⎞

⎜

⎝

⎛+⋅= 1

VV REFOUT

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.

⎟

⎠

⎞

⎜

⎝

⎛−⋅= 121 REF

OUT

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.

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.

One can also connect EN pin through 100k resistor to

input as shown in Figure 2 to achieve the same result.

Micrel, Inc. MIC5280

January 2009 11 M9999-012209-A

Figure 1. MIC5280 EN Always Enabled

Figure 2. Enable Connected to VIN Application

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Bill of Materials

Item Part Number Manufacturer Description Qty.

NMC-P1210X7R184K200TRPLPF NIC(1) Capacitor, 0.18µF, 200V, Size 1210

C1812C184K2RAC Kemet(2)

VJ1812Y184KXC Vishay(3) Capacitor, 0.18µF, 200V, Size 1812 1

C1608X5R1A225K TDK(4) Capacitor, 2.2µF,10V, X5R, Size 0603

0603C225MAT AVX(5) Capacitor, 2.2µF,6.3V, X7R, Size 0603

GRM188R60J225KE19D Murata(6) Capacitor, 2.2µF,6.3V, X5R, Size 0603

C1608X5R0J105K TDK(4)

VJ0603G105KXYPW1BC Vishay(3)

GRM188R60J105KA01D Murata(6)

Capacitor, 1µF,6.3V, X5R, Size 0603 1

R1 CRCW060315R4FKEYE3 Vishay(3) Resistor, 15.4k, 1%, 1/16W, Size 0603 1

R2 CRCW06034R87FKEYE3 Vishay(3) Resistor, 4.8k, 1%, 1/16W, Size 0603 1

U1 MIC5280YME Micrel, Inc.(7) 25mA, 120V, Low IQ, High PSRR LDO 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

Micrel, Inc. MIC5280

January 2009 13 M9999-012209-A

PCB Layout Recommendations

Top Layer

Bottom Layer

Micrel, Inc. MIC5280

January 2009 14 M9999-012209-A

Package Information

8-Pin EPAD SOIC (ME)

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 US

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 implan

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.