Micrel MIC5211-3.0BM6 Dual î¼cap 80ma ldo regulator Datasheet

MIC5211
Micrel, Inc.
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.
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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.
Designed especially for hand-held, battery-powered devices,
ground current is minimized using Micrel’s proprietary Super
ßeta PNP™ technology to prolong battery life. When disabled,
power consumption drops nearly to zero.
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
Dual regulator in tiny SOT-23 package
2.5V to 16V input range
Applications
Key features include SOT-23-6 packaging, current limiting,
overtemperature shutdown, and protection against reversed
battery conditions.
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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.
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
Typical Application
VIN
MIC5211
Enable
Shutdown
1
2
5
Enable
Shutdown
3
4
EnableA
6
VOUTA
0.1µF
0.1µF
EnableB
VOUTB
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
Standard
Pb-Free Part Number
Mark Code
MIC5211-1.8BM6
LFBB
MIC5211-2.5BM6
MIC5211-2.7BM6
Full
Manufacturing
Mark Code
Voltage
Side A / Side B
Temperature
Range
Package
MIC5211-1.8YM6
LFBB
1.8V
0ºC to +125ºC
SOT-23-6
LFCC
Contact Factory
LFCC
2.5V
–40ºC to +125ºC
SOT-23-6
LFDD
MIC5211-2.7YM6
LFDD
2.7V
–40ºC to +125ºC
SOT-23-6
MIC5211-2.8BM6
LFEE
MIC5211-2.8YM6
LFEE
2.8V
–40ºC to +125ºC
SOT-23-6
MIC5211-3.0BM6
LFGG
MIC5211-3.0YM6
LFGG
3.0V
–40ºC to +125ºC
SOT-23-6
MIC5211-3.3BM6
LFLL
MIC5211-3.3YM6
LFLL
3.3V
–40ºC to +125ºC
SOT-23-6
MIC5211-3.6BM6
LFQQ
MIC5211-3.6YM6
LFQQ
3.6V
–40ºC to +125ºC
SOT-23-6
MIC5211-5.0BM6
LFXX
MIC5211-5.0YM6
LFXX
5.0V
–40ºC to +125ºC
SOT-23-6
LFBC
MIC5211-1.8/2.5YM6
MIC5211-BCYM6
LFBC
1.8V / 2.5V
0ºC to +125ºC
SOT-23-6
MIC5211-1.8/3.3BM6
LFBL
MIC5211-1.8/3.3YM6
MIC5211-BLYM6
LFBL
1.8V / 3.3V
0ºC to +125ºC
SOT-23-6
MIC5211-2.5/3.3BM6
LFCL
MIC5211-2.5/3.3YM6
MIC5211-CLYM6
LFCL
2.5V / 3.3V
–40ºC to +125ºC
SOT-23-6
MIC5211-3.3/5.0BM6
LFLX
MIC5211-3.3/5.0YM6
MIC5211-LXYM6
LFLX
3.3V / 5.0V
–40ºC to +125ºC
SOT-23-6
Dual-Voltage Regulators
MIC5211-1.8/2.5BM6
Other voltages available. Contact Micrel for details.
Pin Configuration
OUTA IN OUT B
6
Pin 1
Index
5
4
Part
Identification
LFxx
1
2
3
ENA GND E N B
RegulatorA
Voltage Code
(VOUTA )
RegulatorB
Voltage Code
(VOU TB )
Pin Description
Pin Number
Pin Name
1
ENA
2
GND
Ground
3
ENB
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
4
OUTB
MIC5211
5
IN
6
OUTA
Pin Function
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
Regulator Output B
Supply Input
Regulator Output A
2
May 2006
MIC5211
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Input Voltage (VIN) ..............................–20V to +20V
Enable Input Voltage (VEN) ............................–20V to +20V
Power Dissipation (PD) ............................. Internally Limited
Storage Temperature Range .................... –60°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD, (Note 3) ......................................................................
Supply Input Voltage (VIN) .................................2.5V to 16V
Enable Input Voltage (VEN) ..................................0V to 16V
Junction Temperature (TJ) (except 1.8V).. –40°C to +125°C
1.8V only................................................... 0°C to +125°C
6-lead SOT-23-6 (θJA) ............................................. Note 4
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
VO
Output Voltage
Accuracy
variation from nominal VOUT
ΔVO/ΔT
ppm/°C
Output Voltage
Note 5
Typical
–3
–4
Max
Units
3
4
%
%
50
200
Temperature Coeffcient
ΔVO/VO
Line Regulation
VIN = VOUT +1V to 16V
0.008
0.3
0.5
%
%
ΔVO/VO
Load Regulation
IL = 0.1mA to 50mA, Note 6
0.08
0.3
0.5
%
%
VIN – VO
Dropout Voltage, Note 7
IL = 100µA
200
450
mV
IQ
Quiescent Current
20
IL = 20mA
IGND
Ground Pin Current
ILIMIT
Current Limit
Note 8
ΔVO/ΔPD
Thermal Regulation
mV
250
500
mV
VEN ≤ 0.4V (shutdown)
0.01
10
µA
IL = 20mA (active)
225
450
750
1200
µA
VOUT = 0V
140
250
mA
IL = 50mA
VEN ≥ 2.0V, IL = 100µA (active)
90
IL = 50mA (active)
Note 9
µA
0.05
µA
%/W
Enable Input
Enable Input Voltage Level
VIL
VIH
IIL
Enable Input Current
IIH
logic low (off)
logic high (on)
VIL ≤ 0.6V
VIH ≥ 2.0V
0.6
V
V
0.01
1
µA
3
50
µA
2.0
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 allowable 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
MIC5211
Micrel, Inc.
Typical Characteristics
MIC5211
4
May 2006
MIC5211
May 2006
Micrel, Inc.
5
MIC5211
MIC5211
Micrel, Inc.
VOUTA
(50mV/div.)
Crosstalk Characteristic
IOUTA
(50mA/div.)
VOUTB
(50mV/div.)
IOUTB = 100µA
COUTB = 0.47µF
COUTA = 0.47µF
TIME (25ms/div.)
MIC5211
6
May 2006
MIC5211
Micrel, Inc.
Applications Information
PD(max) =
Enable/Shutdown
ENA and ENB (enable/shutdown) may be controlled separately. Forcing ENA/B high (>2V) enables the regulator. The
enable inputs typically draw only 15µA.
PD(max) =
TJ(max) – TA
θJA
125°C – 25°C
220°C/W
PD(max) = 455mW
While the logic threshold is TTL/CMOS compatible, ENA/B
may be forced as high as 20V, independent of VIN. ENA/B may
be connected to the supply if the function is not required.
The MIC5211-3.0 can supply 3V to two different loads independently from the same supply voltage. If one of the regulators
is supplying 50mA at 3V from an input voltage of 4V, the total
power dissipation in this portion of the regulator is:
PD1 = (VIN – VOUT) IOUT + VIN • IGND
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.
Output Capacitor
PD1 = (4V – 3V) 50mA + 4V • 0.85mA
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, including the tiny, low-ESR ceramic chip capacitors. The output
capacitor value can be increased without limit to improve
transient response.
PD1 = 53.4mW
Up to approximately 400mW can be dissipated by the remaining regulator (455mW – 53.4mW) before reaching the thermal
shutdown temperature, allowing up to 50mA of current.
PD2 = (VIN – VOUT) IOUT + VIN • IGND
PD2 = (4V – 3V) 50mA + 4V • 0.85mA
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.
PD2 = 53.4mW
The total power dissipation is:
PD1 + PD2 = 53.4mW + 53.4mW
PD1 + PD2 = 106.8mW
Therefore, with a supply voltage of 4V, both outputs can operate safely at room temperature and full load (50mA).
No-Load Stability
VIN
The MIC5211 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.
MIC5211
Thermal Shutdown
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.
OUTA
ENA
O UTB
ENB
GND
VOUTA
VOU TB
1µF 1µF
Figure 1. Thermal Conditions Circuit
Thermal Considerations
In many applications, the ambient temperature is much higher.
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.
TJ(max) – TA
PD(max) =
θJA
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 dissipation 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.
PD(max) =
125°C – 70°C
220°C/W
PD(max) = 250mW
The maximum power dissipation for the total regulator system
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
resistance (θJA) is 220°C/W. Since the maximum junction
temperature for this device is 125°C, at an operating temperature of 25°C the maximum power dissipation is:
May 2006
IN
At 70°C, the device can provide 250mW of power dissipation,
suitable for the above application.
When using supply voltages higher than 4V, do not exceed
the maximum power dissipation for the device. If the device is
operating from a 7.2V-nominal two-cell lithium-ion battery and
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MIC5211
MIC5211
Micrel, Inc.
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.
both regulators are dropping the voltage to 3.0V, then output
current will be limited at higher ambient temperatures.
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:
PD1 = (7.2V – 3V) 50mA + 7.2V · 0.85mA
PD1 = 216mW
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:
PD = (VGND – VOUT) IOUT + VGND · IGND
PD(3.3V) = (6V – 3.3V) 50mA + 6V · 0.85mA
PD(3.3V) = 140.1mW
PD(max) = 455mW
PD2(max) = 34mW
(7.2V – 3V) IOUT2(max) = 34mW
PD(max) – PD(3.3V) = PD(5V)
IOUT2(max) = 8mA
PD(5V) = 455mW – 140.1mW
4.2V • IOUT2(max) = 34mW
PD(5V) = 314.9mW
The second regulator can provide up to 8mA output current,
suitable for the keep-alive circuitry often required in handheld applications.
Based on the power dissipation allowed for the 5V section, the
amount of output current it can source is easily calculated.
Refer to Application Hint 17 for heat sink requirements when
higher power dissipation capability is needed. Refer to Designing with Low Dropout Voltage Regulators for a more thorough
discussion of regulator thermal characteristics.
PD(5V) = 314.9mW
314.9mW = (6V – 5V) IMAX – 6V · IGND
(IGND typically adds less than 5% to the total power dissipation and in this case can be ignored)
Dual-Voltage Considerations
314.9mW = (6V – 5V) IMAX
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 example, 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.
MIC5211
IMAX = 314.9mA
IMAX 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.
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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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