MIC5211-CLYM6TR [MICREL]
DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO6, LEAD FREE, MO-193, SOT-23, 6 PIN;
| 型号： | MIC5211-CLYM6TR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO6, LEAD FREE, MO-193, SOT-23, 6 PIN 稳压器 调节器 光电二极管 输出元件 |
| 文件： | 总9页 (文件大小：1129K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5211
Dual µCap 80mA LDO Regulator
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
TheµCapregulatordesignisoptimizedtoworkwithlow-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
ßetaPNP™technologytoprolongbatterylife.Whendisabled,
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.
Typical Application
VIN
MIC5211
1
2
3
6
Enable
VOUTA
0.1µF
Shutdown
5
EnableA
4
Enable
Shutdown
VOUTB
0.1µF
EnableB
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2006
1
MIC5211
MIC5211
Micrel, Inc.
Ordering Information
Part Number
Pb-Free Part Number
Manufacturing
Voltage
Side A / Side B
Temperature
Range
Package
Standard
Mark Code Full
Mark Code
LFBB
MIC5211-1.8BM6
MIC5211-2.5BM6
MIC5211-2.7BM6
MIC5211-2.8BM6
MIC5211-3.0BM6
MIC5211-3.3BM6
MIC5211-3.6BM6
MIC5211-5.0BM6
Dual-Voltage Regulators
MIC5211-1.8/2.5BM6
MIC5211-1.8/3.3BM6
MIC5211-2.5/3.3BM6
MIC5211-3.3/5.0BM6
LFBB
LFCC
LFDD
LFEE
LFGG
LFLL
MIC5211-1.8YM6
Contact Factory
MIC5211-2.7YM6
MIC5211-2.8YM6
MIC5211-3.0YM6
MIC5211-3.3YM6
MIC5211-3.6YM6
MIC5211-5.0YM6
1.8V
2.5V
2.7V
2.8V
3.0V
3.3V
3.6V
5.0V
0ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
LFCC
LFDD
LFEE
LFGG
LFLL
LFQQ
LFXX
LFQQ
LFXX
LFBC
LFBL
LFCL
LFLX
MIC5211-1.8/2.5YM6 MIC5211-BCYM6
MIC5211-1.8/3.3YM6 MIC5211-BLYM6
MIC5211-2.5/3.3YM6 MIC5211-CLYM6
MIC5211-3.3/5.0YM6 MIC5211-LXYM6
LFBC
LFBL
LFCL
LFLX
1.8V / 2.5V
1.8V / 3.3V
2.5V / 3.3V
3.3V / 5.0V
0ºC to +125ºC
0ºC to +125ºC
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
–40ºC to +125ºC
–40ºC to +125ºC
Other voltages available. Contact Micrel for details.
Pin Configuration
OUTA IN OUTB
6
5
4
Part
Identification
Pin 1
Index
LFxx
1
2
3
ENA GND ENB
RegulatorA
RegulatorB
Voltage Code Voltage Code
(VOUTA
(VOUTB)
)
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
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Micrel, Inc.
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
IN
Enable Input Voltage (V ) ............................–20V to +20V
Enable Input Voltage (V ) ..................................0V to 16V
EN
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
VIN = VOUT + 1V; IL = 1mA; CL = 0.1µF, and VEN ≥ 2.0V; TJ = 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
VO
Output Voltage
Accuracy
variation from nominal VOUT
–3
–4
3
4
%
%
ΔVO/ΔT
ppm/°C
Output Voltage
Note 5
50
200
Temperature Coeffcient
Line Regulation
ΔVO/VO
ΔVO/VO
VIN – VO
VIN = VOUT +1V to 16V
0.008
0.08
0.3
0.5
%
%
Load Regulation
IL = 0.1mA to 50mA, Note 6
0.3
0.5
%
%
Dropout Voltage, Note 7
IL = 100µA
20
200
250
0.01
90
mV
mV
mV
µA
IL = 20mA
450
500
10
IL = 50mA
IQ
Quiescent Current
Ground Pin Current
Note 8
VEN ≤ 0.4V (shutdown)
VEN ≥ 2.0V, IL = 100µA (active)
IL = 20mA (active)
IL = 50mA (active)
VOUT = 0V
IGND
µA
225
750
140
0.05
450
1200
250
µA
µA
ILIMIT
Current Limit
mA
%/W
ΔVO/ΔPD
Enable Input
Thermal Regulation
Note 9
Enable Input Voltage Level
Enable Input Current
VIL
VIH
logic low (off)
logic high (on)
0.6
V
V
2.0
IIL
VIL ≤ 0.6V
VIH ≥ 2.0V
0.01
3
1
µA
µA
IIH
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 TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allow-
able power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA is 220°C/W for 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 VIN = 16V for t = 10ms.
May 2006
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MIC5211
Micrel, Inc.
Typical Characteristics
MIC5211
4
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MIC5211
Micrel, Inc.
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MIC5211
MIC5211
Micrel, Inc.
Crosstalk Characteristic
I
= 100µA
= 0.47µF
= 0.47µF
OUTB
C
OUTB
C
OUTA
TIME (25ms/div.)
MIC5211
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May 2006
MIC5211
Micrel, Inc.
T
– T
A
Applications Information
Enable/Shutdown
J(max)
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
P
D(max)
D(max)
= 455mW
While the logic threshold is TTL/CMOS compatible, ENA/B
maybeforcedashighas20V,independentofV .ENA/Bmay
be connected to the supply if the function is not required.
IN
TheMIC5211-3.0cansupply3Vtotwodifferentloadsindepen-
dently from the same supply voltage. If one of the regulators
is supplying 50mAat 3V from an input voltage of 4V, the total
power dissipation in this portion of the regulator is:
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
D1
IN
OUT OUT IN GND
P
P
= (4V – 3V) 50mA + 4V • 0.85mA
= 53.4mW
D1
D1
Output Capacitor
Typical PNP based regulators require an output capacitor
to prevent oscillation. The MIC5211 is ultrastable, requiring
only 0.1µF of output capacitance per regulator for stability.
The regulator is stable with all types of capacitors, includ-
ing the tiny, low-ESR ceramic chip capacitors. The output
capacitor value can be increased without limit to improve
transient response.
Uptoapproximately400mWcanbedissipatedbytheremain-
ingregulator(455mW–53.4mW)beforereachingthethermal
shutdown temperature, allowing up to 50mA of current.
P
= (V – V
) I
+ V • I
D2
IN
OUT OUT IN GND
P
P
= (4V – 3V) 50mA + 4V • 0.85mA
= 53.4mW
D2
D2
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.
The total power dissipation is:
P
+ P = 53.4mW + 53.4mW
D2
D1
P
+ P = 106.8mW
D1
D2
Therefore, withasupplyvoltageof4V, bothoutputscanoper-
ate safely at room temperature and full load (50mA).
No-Load Stability
VIN
TheMIC5211will remain stableandinregulation withnoload
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS
RAM keep-alive applications.
MIC5211
VOUTA
VOUTB
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
Inmanyapplications,theambienttemperatureismuchhigher.
By recalculating the maximum power dissipation at 70°C
ambient, it can be determined if both outputs can supply full
load when powered by a 4V supply.
When designing with a dual low-dropout regulator, both sec-
tions 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
– T
A
J(max)
P
=
=
D(max)
θ
JA
125°C – 70°C
220°C/W
P
P
D(max)
D(max)
= 250mW
Themaximumpowerdissipationforthetotalregulatorsystem
can be determined using the operating temperatures and the
thermal resistance of the package. In a minimum footprint
configuration, the SOT-23-6 junction-to-ambient thermal
At70°C, thedevicecanprovide250mWofpowerdissipation,
suitable for the above application.
When using supply voltages higher than 4V, do not exceed
themaximumpowerdissipationforthedevice. Ifthedeviceis
operatingfroma7.2V-nominaltwo-celllithium-ionbatteryand
resistance (θ ) is 220°C/W. Since the maximum junction
temperature for this device is 125°C, at an operating tem-
perature of 25°C the maximum power dissipation is:
JA
May 2006
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MIC5211
MIC5211
Micrel, Inc.
both regulators are dropping the voltage to 3.0V, then output
current will be limited at higher ambient temperatures.
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
dissipation.
For example, at 70°C ambient the first regulator can supply
3.0V at 50mA output from a 7.2V supply; however, the sec-
ond regulator will have limitations on output current to avoid
thermal shutdown. The dissipation of the first regulator is:
P
P
= (7.2V – 3V) 50mA + 7.2V·0.85mA
= 216mW
D1
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
= 455mW
P
= 34mW
D(max)
D2(max)
P
– P
= P
(7.2V – 3V) I
4.2V • I
= 34mW
D(max)
D(3.3V) D(5V)
OUT2(max)
= 34mW
OUT2(max)
P
P
= 455mW – 140.1mW
= 314.9mW
I
= 8mA
D(5V)
OUT2(max)
The second regulator can provide up to 8mA output current,
suitable for the keep-alive circuitry often required in hand-
held applications.
D(5V)
Basedonthepowerdissipationallowedforthe5Vsection,the
amount of output current it can source is easily calculated.
Refer toApplication Hint 17 for heat sink requirements when
higherpowerdissipationcapabilityisneeded.RefertoDesign-
ingwithLowDropoutVoltageRegulatorsforamorethorough
discussion of regulator thermal characteristics.
P
= 314.9mW
D(5V)
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
Dual-Voltage Considerations
314.9mW = (6V – 5V)I
MAX
For configurations where two different voltages are needed
in 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
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.
I
= 314.9mA
MAX
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
May 2006
MIC5211
Micrel, Inc.
Package Information
SOT-23-6 (M6)
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
This 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.
© 2000 Micrel, Inc.
May 2006
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MIC5211
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