MIC5211-5.0BM6_技术文档

MIC5211

Micrel

MIC5211

Dual µCap 80mA LDO Regulator

Preliminary Information

General Description

Features

The MIC5211 is a dual µCap 80mA linear voltage regulator

with very low dropout voltage (typically 20mV at light loads),

very low ground current (225µA at 20mA output current), and

better than 3% initial accuracy. This dual device comes in the

miniature SOT-23-6 package, featuring independent logic

control inputs.

• Stable with low-value ceramic or tantalum capacitors

• Independent logic controls

• Low quiescent current

• Low dropout voltage

• Mixed voltages available

• Tight load and line regulation

• Low temperature coefficient

• Current and thermal limiting

• Reversed input polarity protection

• Zero off-mode current

The µCap regulator design is optimized to work with low-

value, low-cost ceramic capacitors. The outputs typically

require only 0.1µF of output capacitance for stability.

Designedespeciallyforhand-held,battery-powereddevices,

ground current is minimized using Micrel’s proprietary Super

ßeta PNP™ technology to prolong battery life. When dis-

abled, power consumption drops nearly to zero.

• Dual regulator in tiny SOT-23 package

• 2.5V to 16V input range

Applications

• Cellular telephones

• Laptop, notebook, and palmtop computers

• Battery-powered equipment

• Bar code scanners

• SMPS post regulator/dc-to-dc modules

• High-efficiency linear power supplies

Key features include SOT-23-6 packaging, current limiting,

overtemperature shutdown, and protection against reversed

battery conditions.

The MIC5211 is available in dual 1.8V, 2.5V, 2.7V, 2.8V,

3.0V, 3.3V, 3.6V, and 5.0V versions. Certain mixed voltages

are also available. Contact Micrel for other voltages.

Ordering Information

Part Number

Marking Voltage

Junction Temp. Range

0°C to +125°C

Package

SOT-23-6

MIC5211-1.8BM6

MIC5211-2.5BM6

MIC5211-2.7BM6

MIC5211-2.8BM6

MIC5211-3.0BM6

MIC5211-3.3BM6

MIC5211-3.6BM6

MIC5211-5.0BM6

LFBB

LFCC

LFDD

LFEE

LFGG

LFLL

1.8V

2.5V

2.7V

2.8V

3.0V

3.3V

3.6V

5.0V

–40°C to +125°C

LFQQ

LFXX

Dual-Voltage Regulators

MIC5211-1.8/2.5BM6

MIC5211-1.8/3.3BM6

MIC5211-2.5/3.3BM6

MIC5211-3.3/5.0BM6

LFBC

LFBL

LFCL

LFLX

1.8V/2.5V

1.8V/3.3V

2.5V/3.3V

3.3V/5.0V

0°C to +125°C

SOT-23-6

–40°C to +125°C

Typical Application

Other voltages available. Contact Micrel for details.

V_IN

MIC5211

1

2

3

6

5

4

Enable

Shutdown

V_OUTA

0.1µF

Enable A

Enable

V_OUTB

Shutdown

0.1µF

Enable B

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

November 2000

1

MIC5211

Micrel

Pin Configuration

OUTA IN OUTB

6

5

4

Part

Identification

Pin 1

Index

LFxx

1

2

3

ENA GND ENB

Regulator A

Regulator B

Voltage Code

(V_OUTA

)

(V_OUTB)

Voltage

Code

1.8V

2.5V

2.7V

2.8V

3V

B

C

D

E

G

H

L

3.15V

3.3V

3.6V

5V

Q

X

Pin Description

Pin Number

Pin Name

Pin Function

1

ENA

Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,

logic low or open = shutdown.

2

3

GND

ENB

Ground

Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,

logic low or open = shutdown.

4

5

6

OUTB

IN

Regulator Output B

Supply Input

OUTA

Regulator Output A

MIC5211

2

November 2000

MIC5211

Micrel

Absolute Maximum Ratings (Note 1)

Operating Ratings (Note 2)

Supply Input Voltage (V ) ............................ –20V to +20V

Supply Input Voltage (V ) ............................... 2.5V to 16V

IN

Enable Input Voltage (V ) ........................... –20V to +20V

Enable Input Voltage (V ) ................................. 0V to 16V

EN

Power Dissipation (P ) ............................ Internally Limited

Junction Temperature (T ) (except 1.8V). –40°C to +125°C

D

J

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

Storage Temperature Range ................... –60°C to +150°C

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

ESD, (Note 3) .....................................................................

6-lead SOT-23-6 (θ ).............................................. Note 4

JA

Electrical Characteristics

V_IN= V_OUT+ 1V; I_L= 1mA; C_L= 0.1µF, and V_EN≥ 2.0V; T_J= 25°C, bold values indicate –40°C to +125°C;

for one-half of dual MIC5211; unless noted.

Symbol

Parameter

Conditions

Min Typical Max

Units

V_O

Output Voltage

Accuracy

variation from nominal V_OUT

–3

–4

3

4

%

∆V_O/∆T

∆V_O/V_O

V_IN– V_O

Output Voltage

Temperature Coeffcient

Note 5

50

200 ppm/°C

Line Regulation

V_IN= V_OUT+1V to 16V

I_L= 0.1mA to 50mA, Note 6

0.008

0.08

0.3

0.5

%

Load Regulation

0.3

0.5

%

Dropout Voltage, Note 7

I_L= 100µA

I_L= 20mA

I_L= 50mA

20

200

250

0.01

90

mV

µA

450

500

10

I_Q

Quiescent Current

Ground Pin Current

Note 8

V_EN≤ 0.4V (shutdown)

I_GND

V_EN≥ 2.0V, I_L= 100µA (active)

µA

I_L= 20mA (active)

I_L= 50mA (active)

V_OUT= 0V

225

750

140

0.05

450

1200

250

µA

I_LIMIT

Current Limit

mA

%/W

∆V_O/∆P_D

Enable Input

Thermal Regulation

Note 9

Enable Input Voltage Level

Enable Input Current

V_IL

V_IH

logic low (off)

logic high (on)

0.6

V

2.0

I_IL

V

_IL≤ 0.6V

_IH≥ 2.0V

0.01

3

1

µA

I_IH

V

50

Note 1: Exceeding the absolute maximum rating may damage the device.

Note 2: The device is not guareented to function outside itsperating rating.

Note 3: Devices are ESD sensitive. Handling precautions recommended.

Note 4: The maximum allowable power dissipation at any T (ambient temperature) is P

= (T

– T ) / θ . Exceeding the maximum

A

D(max)

J(max) A JA

allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ is 220°C/W for

JA

the SOT-23-6 mounted on a printed circuit board.

Note 5: Output voltage temperature coeffiecient is defined as the worst case voltage change divided by the total temperature range.

Note 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 0.1mA to 50mA. Change in output voltage due to heating effects are covered by thermal regulation specification.

Note 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. For output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum voltage being 2.5V.

Minimum input opertating voltage is 2.5V.

Note 8: Ground pin current is the quiescent current per regulator plus pass transistor base current. The total current drawn from the supply is the sum

of the load current plus the ground pin current.

Note 9: Thermal regulation is defined as 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 50mA load pulse at V = 16V for t = 10ms.

IN

November 2000

3

MIC5211

Micrel

Typical Characteristics

Dropout Voltage

vs. Output Current

Dropout Voltage

vs. Temperature

Dropout Characteristics

(MIC5211-3.3)

1000

400

300

200

100

0

4

3

2

1

0

C_IN= 10µF

_OUT= 1µF

C_OUT= 1µF

C

I_L= 100µA

100

10

1

I_L= 50mA

I_L= 100µA

I_L= 1mA

C_IN= 10µF

C_OUT= 1µF

0.01

0.1

1

10

100

-60 -30

0

30 60 90 120 150

0

1

2

3

4

5

6

7

OUTPUT CURRENT (mA)

TEMPERATURE (°C)

SUPPLY VOLTAGE (V)

Ground Current

vs. Output Current

Ground Current

vs. Supply Voltage

Ground Current

vs. Temperature

2000

1500

1000

500

0

2.0

1.5

1.0

0.5

0.0

3.0

2.5

2.0

1.5

1.0

0.5

0.0

C_IN= 10µF

_OUT= 1µF

I_L= 50mA

C

V_OUT= 3.3V

I_L= 100µA

I_L= 50mA

I_L= 100µA

V_IN= V_OUT+ 1V

0

10 20 30 40 50 60 70 80

OUTPUT CURRENT (mA)

0

1

2

3

4

5

6

7

-60 -30

0

30 60 90 120 150

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

Output Voltage

vs. Temperature

Output Voltage

vs. Output Current

Short Circuit Current

vs. Input Voltage

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

160

140

120

100

80

C_IN= 10µF

3.8

3.6

3.4

3.2

3.0

2.8

2.6

2.4

C_OUT= 1µF

C_IN= 10µF

_OUT= 1µF

C

3 DEVICES

60

HI / AVG / LO

C_IN= 10µF

40

C_OUT= 1µF

CURVES APPLICABLE

20

AT 100µA AND 50mA

0

-60 -30

0

30 60 90 120 150

0

50

100

150

200

0

1

2

3

4

5

6

7

TEMPERATURE (°C)

OUTPUT CURRENT (mA)

INPUT VOLTAGE (V)

Short Circuit Current

vs. Temperature

200

180

160

140

120

100

C_IN= 10µF

C_OUT= 1µF

-60 -30

0

30 60 90 120 150

TEMPERATURE (°C)

MIC5211

4

November 2000

MIC5211

Micrel

Load Transient

200

0

100

0

C_OUT= 10µF

C_OUT= 1µF

_IN= V_OUT+ 1

-200

-1400

50

-100

-1200

50

V

_IN= V_OUT+ 1

V

0

-50

-1

-50

-5

0

1

2

3

4

5

6

7

8

0

5

10

15

20

TIME (ms)

Line Transient

(MIC5211-3.3)

Line Transient

(MIC5211-3.3)

3

2

1

C_L= 1µF

C_L= 11µF

I

_L= 1mA

1

I

_L= 1mA

0

-1

-28

-81

6

4

2

4

2

-0.2 0.0 0.2 0.4 0.6 0.8 1.0

TIME (ms)

-0.2 0.0 0.2 0.4 0.6 0.8 1.0

TIME (ms)

Ripple Voltage

vs. Frequency

Ripple Voltage

vs. Frequency

Ripple Voltage

vs. Frequency

100

80

100

80

60

40

20

0

60

40

I_L= 100µA

_L= 1µF

_IN= V_OUT+ 1

I_L= 1mA

_L= 1µF

_IN= V_OUT+ 1

I_L= 50mA

_L= 1µF

_IN= V_OUT+ 1

C

20

0

20

0

V

FREQUENCY (Hz)

November 2000

5

MIC5211

Micrel

Output Impedance

Enable Characteristics

(MIC5211-3.3)

Enable Characteristics

(MIC5211-3.3)

1000

4.0

3.0

2.0

1.0

0.0

-1.40

5

4

3

2

1

100

10

I_L= 100µA

I_L= 1mA

C_L= 1µF

I

_L= 100µA

I

_L= 100µA

0

-41

1

I_L= 50mA

0.1

0.01

2

0

2

0

-2

0

2

4

6

8

10

-0.2 0.0 0.2 0.4 0.6 0.8 1.0

TIME (ms)

TIME (µs)

FREQUENCY (Hz)

Minimum Supply Voltage

vs. Temperature

Enable Voltage

vs. Temperature

Enable Current

vs. Temperature

3.5

3.4

3.3

1.50

1.25

1.00

0.75

0.50

40

C_IN= 10µF

_OUT= 1µF

_L= 1mA

C_IN= 10µF

_OUT= 1µF

_L= 1mA

C

I_L= 1mA

30

20

10

0

I

V

= 3.3V

OUT

V_EN= 5V

V_ON

V_OFF

C_IN= 10µF

_OUT= 1µF

V_EN= 2V

C

-60 -30

0

30 60 90 120 150

TEMPERATURE (°C)

-60 -30

0

30 60 90 120 150

-60 -30

0

30 60 90 120 150

TEMPERATURE (°C)

Crosstalk Characteristic

I_OUTB= 100µA

C_OUTB= 0.47µF

C_OUTA= 0.47µF

TIME (25ms/div.)

MIC5211

6

November 2000

MIC5211

Micrel

Applications Information

Enable/Shutdown

T

_J(max)− T_A

P_D(max)

=

θ_JA

ENA and ENB (enable/shutdown) may be controlled sepa-

rately. Forcing ENA/B high (>2V) enables the regulator. The

enable inputs typically draw only 15µA.

125°C − 25°C

220°C/W

P

D(max)

While the logic threshold is TTL/CMOS compatible, ENA/B

P_D(max)= 455mW

may be forced as high as 20V, independent of V . ENA/B

IN

The MIC5211-3.0 can supply 3V to two different loads inde-

pendently from the same supply voltage. If one of the regu-

latorsissupplying50mAat3Vfromaninputvoltageof4V,the

total power dissipation in this portion of the regulator is:

may be connected to the supply if the function is not required.

Input Capacitor

A 0.1µF 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 when a battery is used as the input.

P

= V − V

I

+ V I

IN GND

(

)

D1

IN

OUT OUT

Output Capacitor

P

= 4V − 3V 50mA + 4V 0.85mA

(

)

D1

Typical PNP based regulators require an output capacitor to

preventoscillation.TheMIC5211isultrastable,requiringonly

0.1µF of output capacitance per regulator for stability. The

regulator is stable with all types of capacitors, including the

tiny, low-ESR ceramic chip capacitors. The output capacitor

value can be increased without limit to improve transient

response.

P_D1= 53.4mW

Uptoapproximately400mWcanbedissipatedbytheremain-

ing regulator (455mW – 53.4mW) before reaching the ther-

mal shutdown temperature, allowing up to 50mA of current.

P

= V − V

I

+ V I

IN GND

(

)

D2

IN

OUT OUT

The capacitor should have a resonant frequency above

500kHz. Ceramic capacitors work, but some dielectrics have

poor temperature coefficients, which will affect the value of

the output capacitor over temperature. Tantalum capacitors

are much more stable over temperature, but typically are

larger and more expensive. Aluminum electrolytic capacitors

will also work, but they have electrolytes that freeze at about

–30°C. Tantalum or ceramic capacitors are recommended

for operation below –25°C.

P

= 4V − 3V 50mA + 4V 0.85mA

(

)

D2

P

= 53.4mW

D2

The total power dissipation is:

_D1+P_D2= 53.4mW + 53.4mW

+P = 106.8mW

P

D1

D2

Therefore, with a supply voltage of 4V, both outputs can

operate safely at room temperature and full load (50mA).

No-Load Stability

TheMIC5211willremainstableandinregulationwithnoload

(other than the internal voltage divider) unlike many other

voltage regulators. This is especially important in CMOS

RAM keep-alive applications.

V_IN

MIC5211

V_OUTA

V_OUTB

IN

OUTA

ENA OUTB

ENB GND

Thermal Shutdown

1µF 1µF

Thermal shutdown is independent on both halves of the dual

MIC5211, however, an overtemperature condition in one half

may affect the other half because of proximity.

Figure 1. Thermal Conditions Circuit

Thermal Considerations

In many applications, the ambient temperature is much

higher. By recalculating the maximum power dissipation at

70°Cambient, itcanbedeterminedifbothoutputscansupply

full load when powered by a 4V supply.

When designing with a dual low-dropout regulator, both

sections must be considered for proper operation. The part is

designed with thermal shutdown, therefore, the maximum

junction temperature must not be exceeded. Since the dual

regulators share the same substrate, the total power dissipa-

tion must be considered to avoid thermal shutdown. Simple

thermal calculations based on the power dissipation of both

regulators will allow the user to determine the conditions for

proper operation.

T

_J(max)− T_A

P_D(max)

=

θ_JA

125°C − 70°C

220°C/W

P

D(max)

The maximum power dissipation for the total regulator sys-

temcanbedeterminedusingtheoperatingtemperaturesand

thethermalresistanceofthepackage. Inaminimumfootprint

configuration, the SOT-23-6 junction-to-ambient thermal re-

P_D(max)= 250mW

At70°C, thedevicecanprovide250mWofpowerdissipation,

suitable for the above application.

sistance (θ ) is 220°C/W. Since the maximum junction

JA

temperature for this device is 125°C, at an operating tem-

perature of 25°C the maximum power dissipation is:

When using supply voltages higher than 4V, do not exceed

the maximum power dissipation for the device. If the device

November 2000

7

MIC5211

Micrel

is operating from a 7.2V-nominal two-cell lithium-ion battery

and both regulators are dropping the voltage to 3.0V, then

output current will be limited at higher ambient temperatures.

considerations must be taken to ensure proper functionality

of the part. The input voltage must be high enough for the 5V

section to operate correctly, this will ensure the 3.3V section

proper operation as well.

For example, at 70°C ambient the first regulator can supply

3.0V at 50mA output from a 7.2V supply; however, the

second regulator will have limitations on output current to

avoid thermal shutdown. The dissipation of the first regulator

is:

Both regulators live off of the same input voltage, therefore

the amount of output current each regulator supplies may be

limited thermally. The maximum power the MIC5211 can

dissipate at room temperature is 455mW, as shown in the

“Thermal Considerations” section. If we assume 6V input

voltage and 50mA of output current for the 3.3V section of the

regulator, then the amount of output current the 5V section

can provide can be calculated based on the power dissipa-

tion.

P

= 7.2V − 3V 50mA + 7.2V 0.85mA

(

)

D1

P

= 216mW

D1

Since maximum power dissipation for the dual regulator is

250mW at 70°C, the second regulator can only dissipate up

to 34mW without going into thermal shutdown. The amount

of current the second regulator can supply is:

P = (V

– V

) I

+ V · I

GND GND

D

GND

OUT OUT

P

= (6V – 3.3V) 50mA + 6V · 0.85mA

= 140.1mW

D(3.3V)

P

D(3.3V)

P

= 34mW

D2(max)

P

= 455mW

D(max)

7.2V − 3V I

= 34mW

(

)

OUT2(max)

P

– P

= P

D(max)

D(3.3V) D(5V)

4.2V I

= 34mW

OUT2(max)

P

= 455mW – 140.1mW

D(5V)

I

= 8mA

OUT2(max)

= 314.9mW

D(5V)

Based on the power dissipation allowed for the 5V section,

theamountofoutputcurrentitcansourceiseasilycalculated.

The second regulator can provide up to 8mA output current,

suitable for the keep-alive circuitry often required in hand-

held applications.

P

= 314.9mW

D(5V)

Refer to Application Hint 17 for heat sink requirements when

higher power dissipation capability is needed. Refer to De-

signing with Low Dropout Voltage Regulators for a more

thorough discussion of regulator thermal characteristics.

314.9mW = (6V – 5V) I

– 6V · I

GND

MAX

(I

typically adds less than 5% to the total power dissipa-

tion and in this case can be ignored)

GND

314.9mW = (6V – 5V) I

MAX

Dual-Voltage Considerations

I

= 314.9mA

MAX

Forconfigurationswheretwodifferentvoltagesareneededin

the system, the MIC5211 has the option of having two

independent output voltages from the same input. For ex-

ample, a 3.3V rail and a 5.0V rail can be supplied from the

MIC5211 for systems that require both voltages. Important

I

exceeds the maximum current rating of the device.

Therefore, for this condition, the MIC5211 can supply 50mA

of output current from each section of the regulator.

MAX

MIC5211

8

November 2000

MIC5211

Micrel

Package Information

1.90 (0.075) REF

0.95 (0.037) REF

1.75 (0.069) 3.00 (0.118)

1.50 (0.059) 2.60 (0.102)

DIMENSIONS:

MM (INCH)

1.30 (0.051)

0.90 (0.035)

3.00 (0.118)

2.80 (0.110)

0.20 (0.008)

0.09 (0.004)

10°

0°

0.15 (0.006)

0.00 (0.000)

0.50 (0.020)

0.35 (0.014)

0.60 (0.024)

0.10 (0.004)

SOT-23-6 (M6)

November 2000

9

MIC5211

Micrel

MIC5211

10

November 2000

MIC5211

Micrel

November 2000

11

MIC5211

Micrel

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

MIC5211

12

November 2000


型号：	MIC5211-5.0BM6
厂家：	MICREL SEMICONDUCTOR
描述：	Dual レCap 80mA LDO Regulator Preliminary Information 双レ帽80毫安LDO稳压器的初步信息稳压器调节器光电二极管输出元件
文件：	总12页 (文件大小：72K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC5211-5.0BM6 [MICREL]

相关型号：

MIC5211-5.0BM6T&R

MIC5211-5.0YM6

MIC5211-BCYM6

MIC5211-BCYM6TR

MIC5211-BLYM6

MIC5211-BLYM6TR

MIC5211-CLYM6

MIC5211-CLYM6-TR

MIC5211-CLYM6TR

MIC5211-LXYM6

MIC5211-LXYM6-TR

MIC5211_05