MIC5205-2.9BM5 [MICREL]
150mA Low-Noise LDO Regulator; 150毫安低噪声LDO稳压器
| 型号： | MIC5205-2.9BM5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 150mA Low-Noise LDO Regulator |
| 文件： | 总12页 (文件大小：101K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5205
150mA Low-Noise LDO Regulator
General Description
Features
TheMIC5205isanefficientlinearvoltageregulatorwithultra-
low-noise output, very low dropout voltage (typically 17mV at
light loads and 165mV at 150mA), and very low ground
current (600µA at 100mA output). The MIC5205 offers better
than 1% initial accuracy.
• Ultra-low-noise output
• High output voltage accuracy
• Guaranteed 150mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Reverse-battery protection
• “Zero” off-mode current
Designedespeciallyforhand-held,battery-powereddevices,
the MIC5205 includes a CMOS or TTL compatible enable/
shutdown control input. When shutdown, power consump-
tion drops nearly to zero. Regulator ground current increases
only slightly in dropout, further prolonging battery life.
• Logic-controlled electronic enable
Key MIC5205 features include a reference bypass pin to
improve its already excellent low-noise performance, re-
versed-battery protection, current limiting, and
overtemperature shutdown.
Applications
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery-powered equipment
The MIC5205 is available in fixed and adjustable output
voltage versions in a small SOT-23-5 package.
• PCMCIA V and V regulation/switching
CC
PP
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
For low-dropout regulators that are stable with ceramic
output capacitors, see the µCap MIC5245/6/7 family.
Ordering Information
Part Number
Marking Voltage
Accuracy
1%
Junction Temp. Range*
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
MIC5205BM5
LBAA
LB25
LB27
LB28
LB2J
LB29
LB30
LB33
LB36
LB38
LB40
LB50
Adj
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.3V
3.6V
3.8V
4.0V
5.0V
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
MIC5205-2.5BM5
MIC5205-2.7BM5
MIC5205-2.8BM5
MIC5205-2.85BM5
MIC5205-2.9BM5
MIC5205-3.0BM5
MIC5205-3.3BM5
MIC5205-3.6BM5
MIC5205-3.8BM5
MIC5205-4.0BM5
MIC5205-5.0BM5
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
Other voltages available. Contact Micrel for details.
Typical Application
MIC5205-x.xBM5
VIN
VOUT
1
2
3
5
COUT = 2.2µF
tantalum
4
Enable
Shutdown
Low-Noise Operation:
BYP = 470pF, COUT ≥ 2.2µF
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
CBYP
C
Basic Operation:
CBYP = not used, COUT ≥ 1µF
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
1
MIC5205
MIC5205
Micrel
Pin Configuration
EN GND IN
EN GND IN
3
2
1
3
2
1
Part
Identification
LBxx
LBAA
4
5
4
5
BYP
OUT
ADJ
OUT
MIC5205-x.xBM5
Fixed Voltages
MIC5205BM5
Adjustable Voltage
Pin Description
MIC5205-x.x
(fixed)
MIC5205
(adjustable)
Pin Name
Pin Function
1
2
3
1
2
3
IN
GND
EN
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
4
BYP
ADJ
OUT
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open.
4
5
Adjust (Input): Adjustable regulator feedback input. Connect to resistor
voltage divider.
5
Regulator Output
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Input Voltage (V ) ............................ –20V to +20V
Input Voltage (V ) ....................................... +2.5V to +16V
IN
IN
Enable Input Voltage (V ) .................................. 0V to V
Enable Input Voltage (V ) ........................... –20V to +20V
EN
IN
EN
Junction Temperature (T ) ....................... –40°C to +125°C
J
Power Dissipation (P ) ............... Internally Limited, Note 3
D
Thermal Resistance, SOT-23-5 (θ )....................... Note 3
JA
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Junction Temperature (T ) ....................... –40°C to +125°C
J
Storage Temperature (T ) ....................... –65°C to +150°C
S
MIC5205
2
June 2000
MIC5205
Micrel
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min Typical Max
Units
VO
Output Voltage Accuracy
variation from specified VOUT
–1
–2
1
2
%
%
∆VO/∆T
∆VO/VO
∆VO/VO
Output Voltage
Temperature Coefficient
Note 4
40
ppm/°C
Line Regulation
VIN = VOUT + 1V to 16V
IL = 0.1mA to 150mA, Note 5
0.004 0.012
% / V
% / V
0.05
Load Regulation
0.02
0.2
0.5
%
%
VIN – VO
Dropout Voltage, Note 6
IL = 100µA
IL = 50mA
IL = 100mA
IL = 150mA
10
50
70
mV
mV
mV
mV
mV
mV
mV
mV
110
140
165
150
230
250
300
275
350
IGND
IGND
Quiescent Current
V
V
EN ≤ 0.4V (shutdown)
EN ≤ 0.18V (shutdown)
0.01
1
5
µA
µA
Ground Pin Current, Note 7
VEN ≥ 2.0V, IL = 100µA
80
350
600
1300
125
150
600
µA
µA
µA
µA
µA
µA
µA
µA
IL = 50mA
IL = 100mA
IL = 150mA
800
1000
1500
1900
2500
PSRR
ILIMIT
Ripple Rejection
Current Limit
frequency = 100Hz, IL = 100µA
75
dB
mA
VOUT = 0V
320
0.05
260
500
∆VO/∆PD
eno
Thermal Regulation
Output Noise
Note 8
%/W
nV/ Hz
IL = 50mA, CL = 2.2µF,
470pF from BYP to GND
ENABLE Input
VIL
Enable Input Logic-Low Voltage
regulator shutdown
regulator enabled
0.4
0.18
V
V
VIH
IIL
Enable Input Logic-High Voltage
Enable Input Current
2.0
V
VIL ≤ 0.4V
VIL ≤ 0.18V
VIH ≥ 2.0V
VIH ≥ 2.0V
0.01
5
–1
–2
20
25
µA
µA
µA
µA
IIH
2
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3: 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 of the MIC5205-
JA
xxBM5 (all versions) is 220°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
Note 4: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 5: 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 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 6: 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.
Note 7: 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.
Note 8: 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 150mA load pulse at V = 16V for t = 10ms.
IN
June 2000
3
MIC5205
MIC5205
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply Ripple Rejection
vs. Voltage Drop
0
0
-20
60
VIN = 6V
VIN = 6V
OUT = 5V
V
OUT = 5V
50
40
30
20
10
0
V
-20
-40
1mA
-40
10mA
IOUT = 100mA
-60
-60
IOUT = 100µA
-80
-80
IOUT = 100µA
OUT = 1µF
C
OUT = 2.2µF
BYP = 0.01µF
COUT = 1µF
C
C
-100
-100
1E+11E+21E+31E+41E+51E+6 E+7
1E+11E+21E+31E+41E+51E+6 E+7
1k 10k
1M
10 100 100k
10M
1k 10k
1M
10 100
100k
10M
0
0.1
0.2
0.3
0.4
FREQUENCY (Hz)
FREQUENCY (Hz)
VOLTAGE DROP (V)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply Ripple Rejection
vs. Voltage Drop
0
0
100
VIN = 6V
OUT = 5V
VIN = 6V
OUT = 5V
90
80
70
60
50
40
30
20
10
0
V
V
-20
-40
-20
-40
1mA
IOUT = 100mA
-60
-60
10mA
IOUT = 1mA
COUT = 2.2µF
-80
-80
C
OUT = 2.2µF
BYP = 0.01µF
IOUT = 1mA
OUT = 1µF
CBYP = 0.01µF
C
C
-100
-100
1E+11E+21E+31E+41E+51E+6 E+7
1E+11E+21E+31E+41E+51E+6 E+7
1k 10k
1M
10 100 100k
10M
1k 10k
1M
10 100
100k
10M
0
0.1
0.2
0.3
0.4
FREQUENCY (Hz)
FREQUENCY (Hz)
VOLTAGE DROP (V)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Turn-On Time
vs. Bypass Capacitance
0
0
10000
1000
100
VIN = 6V
OUT = 5V
VIN = 6V
VOUT = 5V
V
-20
-40
-20
-40
-60
-60
IOUT = 10mA
-80
-80
IOUT = 10mA
OUT = 1µF
C
OUT = 2.2µF
BYP = 0.01µF
C
C
-100
-100
10
10
1E+11E+21E+31E+41E+51E+6 E+7
1E+11E+21E+31E+41E+51E+6 E+7
1k 10k
1M
10 100 100k
10M
1k 10k
1M
10 100
100k
10M
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (Hz)
CAPACITANCE (pF)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Dropout Voltage
vs. Output Current
0
0
320
VIN = 6V
OUT = 5V
VIN = 6V
VOUT = 5V
280
240
200
160
120
80
V
-20
-40
-20
-40
+125°C
+25°C
-60
-60
–40°C
IOUT = 100mA
IOUT = 100mA
OUT = 1µF
-80
-80
COUT = 2.2µF
BYP = 0.01µF
40
C
C
-100
-100
0
1E+11E+21E1+k31E+41E+51E+6 E+7
1E+11E+21E1+k31E+41E+51E+6 E+7
10k 1M 10M
10 100 100k
10k
1M 10M
0
40
80
120
160
10 100
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
MIC5205
4
June 2000
MIC5205
Micrel
Typical Characteristics
Noise Performance
Noise Performance
Noise Performance
10
10
1
10
1
10mA, COUT = 1µF
1
100mA
10mA
10mA
0.1
0.01
0.1
0.1
1mA
OUT = 1µF
BYP = 10nF
100mA
C
C
0.01
0.001
0.0001
0.01
0.001
0.0001
VOUT = 5V
OUT = 22µF
tantalum
BYP = 10nF
VOUT = 5V
OUT = 10µF
electrolytic
1mA
C
1mA
0.001
0.0001
C
C
VOUT = 5V
1E1+011E+21E+31E+41E+51E+61E+7
1k
1E10+11E+21E1k+31E+41E+51E1M+61E+7
1E10+11E+21E1k+31E+41E+51E1M+61E+7
100
10k 100k 10M
100
10k 100k
10M
100
10k 100k 1M 10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Noise Performance
Noise Performance
Noise Performance
10
1
10
1
10
1
10mA
100mA
100mA
100mA
1mA
0.1
0.1
0.1
0.01
0.001
0.0001
0.01
0.001
0.0001
0.01
0.001
0.0001
1mA
1mA
VOUT = 5V
OUT = 10µF
electrolytic
BYP = 1nF
VOUT = 5V
OUT = 10µF
electrolytic
BYP = 100pF
VOUT = 5V
OUT = 10µF
electrolytic
BYP = 10nF
C
C
C
10mA
10mA
C
C
C
1E10+11E+21E1k+31E+41E+51E1M+61E+7
1E10+11E+21E1k+31E+41E+51E1M+61E+7
1E1+011E+21E+31E+41E+51E+61E+7
10M
1M
100
10k 100k
10M
100
10k 100k
10M
100 1k 10k 100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
June 2000
5
MIC5205
MIC5205
Micrel
Block Diagrams
OUT
IN
VOUT
COUT
VIN
BYP
CBYP
(optional)
Bandgap
Ref.
EN
Current Limit
Thermal Shutdown
MIC5205-x.xBM5
GND
Ultra-Low-Noise Fixed Regulator
OUT
IN
VOUT
COUT
VIN
R1
R2
ADJ
CBYP
(optional)
Bandgap
Ref.
EN
VOUT = VREF (1 + R2/R1)
Current Limit
Thermal Shutdown
MIC5205BM5
GND
Ultra-Low-Noise Adjustable Regulator
MIC5205
6
June 2000
MIC5205
Micrel
Thermal Considerations
Applications Information
The MIC5205 is designed to provide 150mA of continuous
current in a very small package. Maximum power dissipation
canbecalculatedbasedontheoutputcurrentandthevoltage
drop across the part. To determine the maximum power
dissipation of the package, use the junction-to-ambient ther-
malresistanceofthedeviceandthefollowingbasicequation:
Enable/Shutdown
Forcing EN (enable/shutdown) high (> 2V) enables the regu-
lator. EN is compatible with CMOS logic gates.
If the enable/shutdown feature is not required, connect EN
(pin 3) to IN (supply input, pin 1). See Figure 1.
Input Capacitor
T
– TA
(
)
J(max)
A 1µF capacitor should be placed from IN to GND if there is
morethan10inchesofwirebetweentheinputandtheacfilter
capacitor or if a battery is used as the input.
PD
=
(max)
θJA
T
is the maximum junction temperature of the die,
125°C, and T is the ambient operating temperature. θ is
layout dependent; Table 1 shows examples of junction-to-
ambient thermal resistance for the MIC5205.
J(max)
Reference Bypass Capacitor
A
JA
BYP (reference bypass) is connected to the internal voltage
reference. A 470pF capacitor (C
GNDquietsthisreference,providingasignificantreductionin
) connected from BYP to
BYP
Package
θJA Recommended θJA 1" Square
Minimum Footprint Copper Clad
θJC
output noise. C
when using C
reduces the regulator phase margin;
, output capacitors of 2.2µF or greater are
BYP
BYP
SOT-23-5 (M5)
220°C/W
170°C/W
130°C/W
generally required to maintain stability.
The start-up speed of the MIC5205 is inversely proportional
to the size of the reference bypass capacitor. Applications
requiring a slow ramp-up of output voltage should consider
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can be
determined using the equation:
larger values of C
. Likewise, if rapid turn-on is necessary,
.
BYP
P = (V – V
) I
+ V I
IN GND
consider omitting C
D
IN
OUT OUT
BYP
Substituting P
for P and solving for the operating
If output noise is not a major concern, omit C
BYP open.
and leave
D(max)
D
BYP
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For
example, when operating the MIC5205-3.3BM5 at room
temperature with a minimum footprint layout, the maximum
input voltage for a set output current can be determined as
follows:
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. 1.0µF minimum is recommended when C
is not
BYP
used (see Figure 2). 2.2µF minimum is recommended when
is 470pF (see Figure 1). Larger values improve the
regulator’s transient response. The output capacitor value
125°C – 25°C
(
)
P
=
D(max)
C
220°C/W
= 455mW
BYP
P
D(max)
may be increased without limit.
The junction-to-ambient thermal resistance for the minimum
footprint is 220°C/W, from Table 1. The maximum power
dissipationmustnotbeexceededforproperoperation. Using
the output voltage of 3.3V and an output current of 150mA,
the maximum input voltage can be determined. From the
Electrical Characteristics table, the maximum ground current
for 150mA output current is 2500µA or 2.5mA.
The output capacitor should have an ESR (effective series
resistance) of about 5Ω or less 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 electro-
lytes that freeze at about –30°C, solid tantalums are recom-
mended for operation below –25°C.
455mW = (V – 3.3V) 150mA + V ·2.5mA
IN
IN
455mW = V ·150mA – 495mW + V ·2.5mA
IN
IN
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
950mW = V ·152.5mA
IN
V
= 6.23V
IN(max)
Therefore, a 3.3V application at 150mA of output current can
accept a maximum input voltage of 6.2V in a SOT-23-5
package. For a full discussion of heat sinking and thermal
effectsonvoltageregulators, refertotheRegulatorThermals
sectionofMicrel’sDesigningwithLow-DropoutVoltageRegu-
lators handbook.
No-Load Stability
TheMIC5205willremainstableandinregulationwithnoload
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS
RAM keep-alive applications.
June 2000
7
MIC5205
MIC5205
Micrel
Fixed Regulator Applications
R2
R1
V
= 1.242V ×
+ 1
OUT
MIC5205-x.xBM5
VIN
VOUT
2.2µF
1
2
3
5
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 and
4
470pF
have a different V
equation.
OUT
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Resistor values are not critical because ADJ (adjust) has a
high input impedance, but for best results use resistors of
470kΩ or less. A capacitor from ADJ to ground provides
greatly improved noise performance.
Figure 1 includes a 470pF capacitor for low-noise operation
and shows EN (pin 3) connected to IN (pin 1) for an applica-
tion where enable/shutdown is not required. C
minimum.
= 2.2µF
OUT
MIC5205BM5
VIN
VOUT
1
2
3
5
MIC5205-x.xBM5
VIN
VOUT
1
2
3
5
R1
R2
2.2µF
4
1.0µF
4
Enable
Shutdown
470pF
EN
Figure 3. Ultra-Low-Noise
Adjustable Voltage Application
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration where
Figure 3 includes the optional 470pF noise bypass capacitor
from ADJ to GND to reduce output noise.
C
is not required. C
= 1µF minimum.
BYP
OUT
Adjustable Regulator Applications
Dual-Supply Operation
The MIC5205BM5 can be adjusted to a specific output
voltage by using two external resistors (Figure 3). The resis-
tors set the output voltage based on the following equation:
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.
MIC5205
8
June 2000
MIC5205
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)
3.02 (0.119)
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-23-5 (M5)
June 2000
9
MIC5205
MIC5205
Micrel
MIC5205
10
June 2000
MIC5205
Micrel
June 2000
11
MIC5205
MIC5205
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.
© 2000 Micrel Incorporated
MIC5205
12
June 2000
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MIC5205-2.9YM5TR
2.9V FIXED POSITIVE LDO REGULATOR, 0.35V DROPOUT, PDSO5, LEAD FREE, SOT-23, 5 PIN
MICROCHIP
MIC5205-3.0BM5
Fixed Positive LDO Regulator, 3V, 0.35V Dropout, BIPolar, PDSO5, SOT-23, 5 PIN
MICROCHIP
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