MIC5209-2.5YUTR_技术文档

MIC5209

500mA Low-Noise LDO Regulator

General Description

Features

The MIC5209 is an efﬁcient linear voltage regulator with

very low dropout voltage, typically 10mV at light loads and

less than 500mV at full load, with better than 1% output

voltage accuracy

• Output voltage range: 1.8V − 5V

• Meets Intel^®Slot 1 and Slot 2 requirements

• Guaranteed 500mA output over the full operating

temperature range

Designed especially for hand-held, battery-powered

devices, the MIC5209 features low ground current to help

prolong battery life. An enable/shutdown pin on SO-8 and

TO-263- 5 versions can further improve battery life with

near-zero shutdown current.

• Low 500mV maximum dropout voltage at full load

• Extremely tight load and line regulation

• Thermally-efﬁcient surface-mount package

• Low temperature coefﬁcient

• Current and thermal limiting

• Reversed-battery protection

• No-load stability

• 1% output accuracy

• Ultra-low-noise capability in SO-8 and TO-263-5

• Ultra-small 3mm × 3mm DFN package

Key features include reversed-battery protection, current

limiting, overtemperature shutdown, ultra-low-noise

capability (SO-8 and TO-263-5 versions), and availability

in thermally-efﬁcient packaging. The MIC5209 is available

in adjustable or ﬁxed output voltages.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Applications

• Pentium II Slot 1 and Slot 2 support circuits

• Laptop, notebook, and palmtop computers

• Cellular telephones

• Consumer and personal electronics

• SMPS post-regulator/DC-to-DC modules

• High-efﬁciency linear power supplies

Typical Application

3.3V Nominal Input Slot 1 Power Supply

Ultra-Low Noise 5V Regulator

Intel is a registered trademark of Intel Corporation.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Revision 3.0

June 2, 2014

Micrel, Inc.

MIC5209

Ordering Information

Part Number

Voltage

Junction Temperature Range

-40°C to +125°C

-0°C to +125°C

Package

SOT-223

SOIC-8

Pb-Free

MIC5209-2.5BS

MIC5209-2.5YS

MIC5209-3.0BS

MIC5209-3.0YS

MIC5209-3.3BS

MIC5209-3.3YS

MIC5209-3.6BS

MIC5209-3.6YS

MIC5209-4.2BS

MIC5209-4.2YS

MIC5209-5.0BS

MIC5209-5.0YS

MIC5209-1.8BM⁽¹⁾

MIC5209-1.8YM⁽¹⁾

MIC5209-2.5BM

MIC5209-2.5YM

MIC5209-3.0BM

MIC5209-3.0YM

MIC5209-3.3BM

MIC5209-3.3YM

MIC5209-3.6BM

MIC5209-3.6YM

MIC5209-5.0BM

MIC5209-5.0YM

2.5V

X

3.0V

3.3V

3.6V

4.2V

5.0V

1.8V

-0°C to +125°C

SOIC-8

2.5V

-40°C to +125°C

-0°C to +125°C

SOIC-8

2.5V

SOIC-8

3.0V

SOIC-8

3.0V

SOIC-8

3.3V

SOIC-8

3.3V

SOIC-8

3.6V

SOIC-8

3.6V

SOIC-8

5.0V

SOIC-8

5.0V

SOIC-8

MIC5209BM

SOIC-8

Adjustable (2.5V − 5.0V)

MIC5209YM

SOIC-8

X

Adjustable (2.5V − 5.0V)

MIC5209-1.8YU⁽¹⁾

MIC5209-2.5BU

MIC5209-2.5YU

1.8V

2.5V

TO-263-5

-40°C to +125°C

X

Note:

1. Contact Micrel for availability.

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Micrel, Inc.

MIC5209

Ordering Information (Continued)

Part Number

Voltage

Junction Temperature Range

-40°C to +125°C

40°C to +125°C

Package

TO-263-5

8-Pin DFN

Pb-Free

MIC5209-3.0BU

MIC5209-3.0YU

MIC5209-3.3BU

MIC5209-3.3YU

MIC5209-3.6BU

MIC5209-3.6YU

MIC5209-5.0BU

MIC5209-5.0YU

MIC5209BU

3.0V

X

3.3V

3.6V

5.0V

Adjustable (2.5V  5.0V)

MIC5209YU

X

MIC5209YML

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MIC5209

Pin Configuration

MIC5209-x.xBS

MIC5209YML

SOT-223

Fixed Voltages

8-Pin 3mm × 3mm DFN

Adjustable Voltages

MIC5209-x.xBM

SO-8

MIC5209-x.xBU

TO-263-5

Fixed Voltages

MIC5209BM

SO-8

MIC5209BU

TO-263-5

Adjustable Voltages

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MIC5209

Pin Description

Pin Number

8-Pin DFN

Pin Number

SOT-223

Pin Number

SO-8

Pin Number

TO-263-5

Pin Name Pin Function

1, 2

1

2

IN

Supply Input.

Ground: SOT-223 Pin 2 and TAB are internally

connected. SO-8 Pins 5 through 8 are internally

connected.

7

2, TAB

3

GND

5 − 8

Regulator Output: Pins 3 and 4 must be tied

together.

3, 4

8

3

1

4

1

OUT

EN

Enable (Input): CMOS-compatible control input.

Logic High = Enable; Logic Low = Shutdown.

Reference Bypass: Connect external 470pF

capacitor to GND to reduce output noise. Can

be left open. For 1.8V or 2.5V operation, see

Application Information.

4 (Fixed)

5 (Fixed)

BYP

ADJ

Adjust (Input): Feedback input. Connect to

resistive voltage-divider network.

6

4 (Adjustable)

5 (Adjustable)

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MIC5209

Absolute Maximum Ratings⁽²⁾

Operating Ratings⁽³⁾

Supply Voltage (V_IN)...................................... +2.5V to +16V

Output Voltage (V_OUT) Range......................... +1.8V to 5.0V

Junction Temperature (T_J)

Supply Voltage (V_IN)....................................... −20V to +20V

Power Dissipation (P_D)...........................Internally Limited⁽⁴⁾

Junction Temperature (T_J)

2.5V − 5.0V.........................................–40°C to +125°C

1.8V ≤ V_OUT< 2.5V..................................0°C to +125°C

Package Thermal Resistance....................................Note 4

All Except 1.8V ...................................−40°C to +125°C

1.8V Only................................................0°C to +125°C

Lead Temperature (soldering, 5s).............................. 260°C

Storage Temperature (T_S).........................−65°C to +150°C

Electrical Characteristics

V_IN= V_OUT+ 1V, C_OUT= 4.7µF, I_OUT= 100µA; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +125°C, except 0°C ≤ T_J≤ +125°C

for 1.8V ≤ V_OUT< 2.5V, unless noted.

Symbol

Parameter

Condition

Min.

−1

Typ.

Max.

Units

1

V_OUT

Output Voltage Accuracy

Output Voltage Temperature Co-Efficient

Line Regulation

Variation from nominal V_OUT

Note 5

%

2

−2

40

∆V_OUT/∆T

ppm/°C

0.009

0.05

0.1

V_IN= V_OUT+ 1V to 16V

%/V

∆V_OUT/ V_OUT

0.05

10

0.5

Load Regulation

I_OUT= 100µA to 500mA⁽⁶⁾

I_OUT= 100µA

%

0.7

60

80

115

165

350

175

250

300

400

500

600

I_OUT= 50µA

Dropout Voltage⁽⁷⁾

mV

V_IN− V_OUT

I_OUT= 150µA

I_OUT= 500µA

Notes:

2. Exceeding the absolute maximum ratings may damage the device.

3. The device is not guaranteed to function outside its operating ratings.

4. The maximum allowable power dissipation at any T_A(ambient temperature) is calculated using: 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. See Table 1 and the “Thermal

Considerations” sub-section in Application Information for details.

5. Output voltage temperature coefﬁcient is the worst case voltage change divided by the total temperature range.

6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range

from 100µA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation speciﬁcation.

7. Dropout voltage is deﬁned as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V

differential.

8. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load

current plus the ground pin current.

9.

V

_ENis the voltage externally applied to devices with the EN (enable) input pin. [SO-8 (M) and TO-263-5 (U) packages only.]

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MIC5209

Electrical Characteristics (Continued)

V_IN= V_OUT+ 1V, C_OUT= 4.7µF, I_OUT= 100µA; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +125°C, except 0°C ≤ T_J≤ +125°C

for 1.8V ≤ V_OUT< 2.5V, unless noted.

Symbol

Parameter

Condition

Min.

Typ.

Max.

130

170

650

900

2.5

3.0

20

Units

80

V_EN≥ 3.0V, I_OUT= 100µA

µA

350

1.8

8

V_EN≥ 3.0V, I_OUT= 50µA

V_EN≥ 3.0V, I_OUT= 150µA

V_EN≥ 3.0V, I_OUT= 500µA

I_GND

Ground Pin Current^{(8, 9)}

mA

25

3

0.05

0.10

75

V_EN≤ 0.4V (Shutdown)

V_EN≤ 0.18V (Shutdown)

f = 120Hz

I_GND

Ground Pin Quiescent Current⁽⁹⁾

Ripple Rejection

µA

dB

8

PSRR

I_LIMIT

700

900

Current Limit

V_OUT= 0V

mA

%/W

1000

Thermal Regulation

Note 10

0.05

500

∆V_OUT/∆P_D

V_OUT= 2.5V, I_OUT= 50mA

C_OUT= 2.2µF, C_BYP= 0

e_NO

Output Noise⁽¹¹⁾

nV √Hz

I_OUT= 50mA, C_OUT= 2.2µF

300

C_BYP= 470pF

0.4

V

_EN= Logic Low

(Regulator Shutdown)

0.18

V_ENL

Enable Input Logic-Low Voltage

Enable Input Current

V

V_EN= Logic High

(Regulator Enabled)

2.0

0.01

5

V_ENL≤ 0.4V

−1

−2

20

25

30

50

I_ENL

µA

V_ENL≤ 0.18V

V_ENH≤ 2.0V

V_ENH≤ 16V

I_ENH

µA

Notes:

10. Thermal regulation is the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation

effects. Speciﬁcations are for a 500mA load pulse at V N = 16V for t = 10ms.

11. C_BYPis an optional, external bypass capacitor connected to devices with a BYP (bypass) or ADJ (adjust) pin. [SO-8 (M) and TO-263-5 (U) packages

only].

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MIC5209

Block Diagrams

Low-Noise Fixed Regulator (SOT-223 Version Only)

Ultra-Low-Noise Fixed Regulator

Ultra-Low-Noise Adjustable Regulator

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MIC5209

Typical Characteristics

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MIC5209

Typical Characteristics (Continued)

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MIC5209

Application Information

Enable Shutdown

The start-up speed of the MIC5209 is inversely

proportional to the size of the reference bypass capacitor.

Applications requiring a slow ramp-up of output voltage

should consider larger values of C_BYP. Likewise, if rapid

Enable is available only on devices in the SO-8 (M) and

TO-263-5 (U) packages.

Forcing EN (enable/shutdown) high (> 2V) enables the

regulator. EN is compatible with CMOS logic. If the

enable/shutdown feature is not required, connect EN to

IN (supply input).

turn-on is necessary, consider omitting C_BYP

.

If output noise is not critical, omit C_BYPand leave BYP

open.

Input Capacitor

Thermal Considerations

A 1µF capacitor should be placed from IN to GND if there

is more than 10 inches of wire between the input and the

AC ﬁlter capacitor or if a battery is used as the input.

The SOT-223 has a ground tab which allows it to

dissipate more power than the SO-8 (refer to the “Slot-1

Power Supply” sub-section for details). At 25°C ambient,

it will operate reliably at 2W dissipation with “worst-case”

mounting (no ground plane, minimum trace widths, and

FR4 printed circuit board).

Output Capacitor

An output capacitor is required between OUT and GND

to prevent oscillation. The minimum size of the output

capacitor is dependent upon whether a reference bypass

capacitor is used. 1µF minimum is recommended when

CBYP is not used (see Figure 1). 2.2µF minimum is

recommended when CBYP is 470pF (see Figure 2).

Larger values improve the regulator’s transient response.

Thermal resistance values for the SO-8 represent typical

mounting on a 1”-square, copper-clad, FR4 circuit board.

For greater power dissipation, SO-8 versions of the

MIC5209 feature a fused internal lead frame and die

bonding arrangement that reduces thermal resistance

when compared to standard SO-8 packages.

The output capacitor should have an ESR (equivalent

series resistance) of about 1Ω and a resonant frequency

above 1MHz. Ultra-low-ESR capacitors can cause a low

amplitude oscillation on the output and/or underdamped

transient response. Most tantalum or aluminum

electrolytic capacitors are adequate; ﬁlm types will work,

but are more expensive. Since many aluminum

electrolytics have electrolytes that freeze at about –30°C,

solid tantalums are recommended for operation below

−25°C.

Table 1. MIC5209 Thermal Resistance

Package

θ_JA

50°C/W

−

θ_JC

SOT-223 (S)

SO-8 (M)

8°C/W

20°C/W

2°C/W

TO-263-5 (U)

3mm × 3mm DFN (ML)

63°C/W

At lower values of output current, less output capacitance

is needed for output stability. The capacitor can be

reduced to 0.47µF for current below 10mA or 0.33µF for

currents below 1mA.

Multilayer boards with a ground plane, wide traces near

the pads, and large supply-bus lines will have better

thermal conductivity and will also allow additional power

dissipation.

No-Load Stability

For additional heat sink characteristics, refer to Micrel

Application Hint 17, Designing P.C. Board Heat Sinks,

included in Micrel’s Databook. For a full discussion of

heat sinking and thermal effects on voltage regulators,

refer to the “Regulator Thermals” section of Micrel’s

Designing with Low-Dropout Voltage Regulators

handbook.

The MIC5209 will remain stable and in regulation with no

load (other than the internal voltage divider) unlike many

other voltage regulators. This is especially important in

CMOS RAM keep-alive applications.

Reference Bypass Capacitor

BYP (reference bypass) is available only on devices in

SO-8 and TO-263-5 packages.

BYP is connected to the internal voltage reference. A

470pF capacitor (C_BYP) connected from BYP to GND

quiets this reference, providing a signiﬁcant reduction in

output noise (ultra-low-noise performance). Because C_BYP

reduces the phase margin, the output capacitor should be

increased to at least 2.2µF to maintain stability.

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MIC5209

Figure 2 includes the optional 470pF noise bypass

capacitor between BYP and GND to reduce output noise.

Note that the minimum value of C_OUTmust be increased

when the bypass capacitor is used.

Low-Voltage Operation

The MIC5209-1.8 and MIC5209-2.5 require special

consideration when used in voltage-sensitive systems.

They may momentarily overshoot their nominal output

voltages unless appropriate output and bypass capacitor

values are chosen.

During regulator power up, the pass transistor is fully

saturated for a short time, while the error ampliﬁer and

voltage reference are being powered up more slowly from

the output (see Block Diagrams). Selecting larger output

and bypass capacitors allows additional time for the error

ampliﬁer and reference to turn on and prevent overshoot.

To ensure that no overshoot is present when starting up

into a light load (100µA), use a 4.7µF output capacitance

and 470pF bypass capacitance. This slows the turn-on

enough to allow the regulator to react and keep the

output voltage from exceeding its nominal value. At

heavier loads, use a 10µF output capacitance and 470pF

bypass capacitance. Lower values of output and bypass

capacitance can be used, depending on the sensitivity of

the system.

Figure 2. Ultra-Low-Noise Fixed Voltage Regulator

Adjustable Regulator Circuits

The MIC5209BM/U can be adjusted to a speciﬁc output

voltage by using two external resistors (Figure 3). The

resistors set the output voltage based on the equation:

Applications that can withstand some overshoot on the

output of the regulator can reduce the output capacitor

and/or reduce or eliminate the bypass capacitor.

Applications that are not sensitive to overshoot due to

power-on reset delays can use normal output and bypass

capacitor conﬁgurations.

R2

R1







V

= 1.242V 1+

Eq. 1



OUT





Please note the junction temperature range of the

regulator output less than 2.5V (ﬁxed and adjustable) is

0°C to +125°C.

This equation is correct due to the conﬁguration of the

bandgap reference. The bandgap voltage is relative to

the output, as seen in the block diagram. Traditional

regulators normally have the reference voltage relative to

ground; therefore, their equations are different from the

equation for the MIC5209BM/U.

Fixed Regulator Circuits

Figure 1 shows a basic MIC5209-x.xBM (SO-8) ﬁxed-

voltage regulator circuit. See Figure 5 for a similar

conﬁguration using the more thermally-efﬁcient MIC5209-

x.xBS (SOT-223). A 1µF minimum output capacitor is

required for basic ﬁxed- voltage applications.

Although ADJ is a high-impedance input and, for best

performance, R2 should not exceed 470kΩ.

Figure 1. Low-Noise Fixed Voltage Regulator

Figure 3. Low-Noise Adjustable Voltage Regulator

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MIC5209

Figure 4 includes the optional 470pF bypass capacitor

from ADJ to GND to reduce output noise.

A Slot-1 power supply (Figure 5) is easy to implement.

Only two capacitors are necessary, and their values are

not critical. C_INbypasses the internal circuitry and should

be at least 0.1µF. COUT provides output filtering,

improves transient response, and compensates the

internal regulator control loop. Its value should be at least

22µF. C_INand C_OUTcan be increased as much as

desired.

Slot-1 Power Supply Power Dissipation

Powered from a 3.3V supply, the Slot-1 power supply

illustrated in Figure 5 has a nominal efficiency of 75%. At

the maximum anticipated Slot-1 load (320mA), the

nominal power dissipation is only 256mW.

The SOT-223 package has sufﬁcient thermal

characteristics for wide design margins when mounted on

a single-layer copper-clad printed circuit board. The

power dissipation of the MIC5209 is calculated using the

voltage drop across the device output current plus supply

voltage ground current.

Figure 4. Ultra-Low-Noise Adjustable Application

Slot-1 Power Supply

Intel’s Pentium II processors have a requirement for a

2.5V ±5% power supply for a clock synthesizer and its

associated loads. The current requirement for the 2.5V

supply is dependent upon the clock synthesizer used, the

number of clock outputs, and the type of level shifter

(from core logic levels to 2.5V levels). Intel estimates a

“worst-case” load of 320mA.

Considering “worst-case” tolerances, the power

dissipation could be as high as:

(V_IN(MAX)− V_OUT(MAX)) × I_OUT+ V_IN(MAX)× I_GND

[(3.6V − 2.375V) × 320mA] + (3.6V × 4mA)

P_D= 407mW

The MIC5209 was designed to provide the 2.5V power

requirement for Slot-1 applications. Its guaranteed

performance of 2.5V ±3% at 500mA allows adequate

margin for all systems, and the dropout voltage of 500mV

means that it operates from a “worst-case” 3.3V supply

where the voltage can be as low as 3.0V.

Using the maximum junction temperature of 125°C and a

θ_JCof 8°C/W for the SOT-223, 25°C/W for the SO-8, or

2°C/W for the TO-263 package, the following worst-case

heat-sink thermal resistance (θ_SA) requirements are:

T_J(MAX)− T_A

θ_JA

=

P_D

θ_SA= θ_JA= θ_JC

Figure 5. Slot-1 Power Supply

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MIC5209

Table 2 and Figure 6 show that the Slot-1 power supply

application can be implemented with a minimum footprint

layout.

Table 2. Maximum Allowable Thermal Resistance

T_A

40°C

50°C

60°C

75°C

θ

_JA(Limit)

209°C/W

201°C/W

184°C/W

207°C/W

184°C/W

176°C/W

159°C/W

182°C/W

160°C/W

152°C/W

135°C/W

158°C/W

123°C/W

115°C/W

98°C/W

121°C/W

_SASOT-223

_SASO-8

_SATO-263-5

Figure 6 shows the necessary copper pad area to obtain

specific heatsink thermal resistance (θ_SA) values. The θ_SA

values highlighted in Table 2 require much less than

500mm2 of copper and, per Figure 6, can be easily

accomplished with the minimum footprint.

Figure 6. PCB Heatsink Thermal Resistance

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MIC5209

Package Information⁽¹²⁾

SOT-223 (S)

Note:

12. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.

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MIC5209

Package Information⁽¹²⁾(Continued)

8-Pin SOIC (M)

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MIC5209

Package Information⁽¹²⁾(Continued)

TO-263-5 (U)

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MIC5209

Package Information⁽¹²⁾(Continued)

8-Pin 3mm × 3mm DFN (ML)

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.

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型号：	MIC5209-2.5YUTR
厂家：	MICROCHIP
描述：	2.5V FIXED POSITIVE LDO REGULATOR, 0.6V DROPOUT, PSSO5, LEAD FREE, TO-263, 5 PIN 输出元件调节器
文件：	总18页 (文件大小：1703K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC5209-2.5YUTR [MICROCHIP]

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