MIC5252-3.0YML [MICREL]
150mA High PSRR, Low Noise μCap CMOS LDO; 150毫安高PSRR ,低噪声μCap CMOS LDO型号: | MIC5252-3.0YML |
厂家: | MICREL SEMICONDUCTOR |
描述: | 150mA High PSRR, Low Noise μCap CMOS LDO |
文件: | 总9页 (文件大小:645K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MIC5252
150mA High PSRR, Low Noise µCap CMOS LDO
General Description
Features
The MIC5252 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. It offers 1% initial
accuracy, extremely-low dropout voltage (135mV at 150mA)
and low ground current (typically 90µA). The MIC5252
provides a very-low-noise output, ideal for RF applications
where a clean voltage source is required. The MIC5252 has
a high PSRR even at low supply voltages, critical for battery
operated electronics. Anoise bypass pin is also available for
further reduction of output noise.
• Input voltage range: 2.7V to 6.0V
• PSRR = 50dB @ V + 0.3V
O
• Ultra-low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
1.0% initial accuracy
2.0% over temperature
• Low quiescent current: 90µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
• “Zero” off-mode current
Designed specifically for handheld and battery-powered
devices, the MIC5252 provides a TTL-logic-compatible en-
able pin. When disabled, power consumption drops nearly
to zero.
• Thermal shutdown and current limit protection
The MIC5252 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up device
turn-off. The MIC5252 is available in the 6-pin 2mm × 2mm
MLF™ package and the IttyBitty® SOT-23-5 package in a
wide range of output voltages.
Typical Application
VOUT
COUT
VIN
EN
MIC5252-x.xBM5
MIC5252-x.xBML
VIN
VOUT
CIN = 1.0µF
1
2
3
5
ENABLE
SHUTDOWN
6
5
4
1
2
3
Ceramic
CBYP
(optional)
COUT = 1.0µF
Ceramic
4
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
CBYP
= 0.01µF
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-020305
February 2005
1
MIC5252
Micrel, Inc.
Ordering Information
Part Number
Marking
Voltage Junction Temp. Range
Package
Standard
Pb-Free
Standard Pb-Free
MIC5252-1.8BM5
MIC5252-2.5BM5
MIC5252-2.8BM5
MIC5252-1.8YM5
MIC5252-2.5YM5
MIC5252-2.8YM5
L618
L625
L628
L62J
L630
L64H
628
L618
L625
L628
L62J
L630
L64H
628
1.8V
2.5V
-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
SOT-23-5
SOT-23-5
2.8V
SOT-23-5
MIC5252-2.85BM5 MIC5252-2.85YM5
MIC5252-3.0BM5 MIC5252-3.0YM5
MIC5252-4.75BM5 MIC5252-4.75YM5
MIC5252-2.8BML MIC5252-2.8YML
MIC5252-2.85BML MIC5252-2.85YML
MIC5252-3.0BML MIC5252-3.0YML
2.85V
3.0V
SOT-23-5
SOT-23-5
4.75V
2.8V
SOT-23-5
6-Pin 2x2 MLF™
6-Pin 2x2 MLF™
6-Pin 2x2 MLF™
62J
62J
2.85V
3.0V
630
630
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3
2
1
6
5
4
BYP
NC
EN
GND
IN
1
2
3
L6xx
4
5
OUT
BYP
OUT
MIC5252-x.xBM5
SOT-23-5 (M5)
(Top View)
MIC5252-x.xBML
6-Pin 2mm × 2mm MLF™ (ML)
(Top View)
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
SOT-23-5
6-MLF™
1
2
3
3
2
1
IN
GND
EN
Supply Input.
Ground.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4
6
BYP
Reference Bypass: Connect external 0.01µF ≤ CBYP ≤ 1.0µF capacitor to
GND to reduce output noise. May be left open.
5
–
–
4
5
OUT
NC
Regulator Output.
No internal connection.
EP
GND
Ground: Internally connected to the exposed pad. Connect externally to
GND pin.
M9999-020305
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February 2005
MIC5252
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (V )....................................0V to +7V
Input Voltage (V ).......................................... +2.7V to +6V
IN
IN
Enable Input Voltage (V ) ..................................0V to +7V
Enable Input Voltage (V ) ...................................0V to V
EN
EN
IN
(3)
Power Dissipation (P )..........................Internally Limited
Junction Temperature (T )........................ –40°C to +125°C
D
J
Junction Temperature (T )........................ –40°C to +125°C
Thermal Resistance
J
SOT-23 (θ )......................................................235°C/W
Storage Temperature................................ –65°C to +150°C
JA
2x2 MLF™ (θ ) ..................................................90°C/W
JA
Lead Temperature (soldering, 5 sec.)........................ 260°C
(4)
ESD ............................................................................ 2kV
Electrical Characteristics(5)
VIN = VOUT + 1V, VEN = VIN; OUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
I
Symbol
Parameter
Conditions
Min Typical Max
Units
VO
Output Voltage Accuracy
IOUT = 100µA
–1
–3
1
3
%
%
ΔVLNR
Line Regulation
Load Regulation
Dropout Voltage(7)
VIN = VOUT + 1V to 6V
IOUT = 0.1mA to 150mA(6)
IOUT = 100µA
0.02
0.6
0.1
90
0.2
1.5
5
%
%
ΔVLDR
VIN – VOUT
mV
mV
IOUT = 100mA
150
IOUT = 150mA
135
200
250
mV
mV
IQ
Quiescent Current
Ground Pin Current(8)
VEN ≤ 0.4V (shutdown)
IOUT = 0mA
0.2
90
1
µA
µA
µA
dB
dB
dB
mA
IGND
150
200
IOUT = 150mA
117
63
PSRR
Ripple Rejection; IOUT = 150mA
f = 10Hz, COUT = 1.0µF, CBYP = 0.01µF
f = 10Hz, VIN = VOUT + 0.3V
f = 10kHz, VIN = VOUT + 0.3V
VOUT = 0V
48
48
ILIM
Current Limit
250
425
30
en
Output Voltage Noise
COUT = 1.0µF, CBYP = 0.01µF,
µV(rms)
f = 10Hz to 100kHz
Enable Input
VIL
VIH
IEN
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
VIN = 2.7V to 5.5V, regulator shutdown
VIN = 2.7V to 5.5V, regulator enabled
VIL ≤ 0.4V, regulator shutdown
0.4
V
V
1.6
0.01
0.01
500
1
1
µA
µA
Ω
VIH ≥ 1.6V, regulator enabled
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
°C
°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of 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 of the MIC5252-x.xBM5 (all ver-
sions) is 235°C/W on a PC board. See ”Thermal Considerations” section for further details.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
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 150mA. 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 differen-
tial. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating
voltage is 2.7V.
8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin cur-
rent.
February 2005
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M9999-020305
MIC5252
Micrel, Inc.
Typical Characteristics
P S R R with B ypas s Variation
P S R R with B ypas s C ap
P S R R with L oad Variation
(V = V
+ 0.3V)
Variation (V = V
+ 1V)
IN
OUT
IN
OUT
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
10nF
100µA
1µF
1µF
100nF
100nF
0nF
150mA
0nF
10nF
C OUT = 1µF C eramic
VIN = VOUT + 1V
VOUT = 2.8V
C OUT = 1µF C eramic
C BY P = 10nF
VIN = VOUT + 1V
VOUT = 2.8V
C OUT = 1µF C eramic
VIN = VOUT + 0.3V
VOUT = 2.8V
Load = 150mA
Load = 150mA
10k
100
FREQUENCY (Hz)
10k
1k
100k 1M
10k
100
FREQUENCY (Hz)
1k
100k 1M
1k
100k 1M
100
10
10
10
FREQUENCY (Hz)
Output Voltage
Output Voltage
vs . Temperature
P S R R
at 100Hz
vs . L oad C urrent
90
80
70
60
50
40
30
20
10
0
2.85
2.83
2.81
2.79
2.77
2.75
2.73
2.71
2.69
2.67
2.65
2.84
2.82
2.8
100µA
2.78
2.76
2.74
2.72
2.7
150mA
C OUT = 1µF
C BYP = 10nF
VOUT 2.8V
2.8VOUT
100µA
20 40 60 80 100 120
TEMPERATURE (°C)
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
-40 -20 0
VOLTAGE DROP (mV)
G round C urrent
G round C urrent
vs . Temperature
G round C urrent
vs . S uppl Voltage
vs . Output C urrent
y
140
120
100
80
160
140
120
100
80
120
100
80
60
40
20
0
1µA Load
100µA Load
150mA Load
0mA Load
0µA Load
60
60
40
40
20
20
2.8VOUT
0
0
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
-40 -20
0
20 40 60 80 100 120
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Dropout
vs . Temperature
G round C urrent
Dropout C haracteris tics
vs . S uppl
y
Voltage
3
2.5
2
200
180
160
140
120
100
80
140
120
100
80
100µA
10mA Load
150mA
150mA Load
1.5
1
60
60
40
40
2.8VOUT
IL = 150mA
20 40 60 80 100 120
TEMPERATURE (°C)
0.5
20
20
0
0
0
0
-40 -20
0
0
0.5
1
1.5
SUPPLY VOLTAGE (V)
2
2.5
3
3.5
4
4.5
5
0.5
1
1.5
2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
M9999-020305
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February 2005
MIC5252
Micrel, Inc.
Dropout
E nable Thres hold
E nable Thres hold
vs . Temperature
vs . Output C urrent
vs . S upply Voltage
200
1.4
1.3
1.2
1.1
1
1.4
1.3
1.2
1.1
1
180
160
140
120
100
80
VIN = 5V
E nable On
E nable Off
VIN = 3.8V
0.9
0.8
0.7
0.6
0.9
0.8
0.7
0.6
60
40
20
2.8VOUT
0
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
-40 -20
0
20 40 60 80 100 120
2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
S hort C ircuit C urrent
vs . Input S upply Voltage
500
450
400
350
300
250
200
150
100
50
2.8VOUT
0
2.7 3.2 3.7 4.2 4.7 5.2
SUPPLY VOLTAGE (V)
February 2005
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M9999-020305
MIC5252
Micrel, Inc.
Functional Characteristics
EnablePin Delay
Load Transient Response
VOUT = 2.85V
VIN = 3.6V
COUT = 1µF Ceramic
150mA
100µA
TIME (10µs/div)
TIME (40µs/div)
Line Transient Response
5V
3.3V
50mALoad
TIME (10µs/div)
M9999-020305
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February 2005
MIC5252
Micrel, Inc.
Block Diagram
IN
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Reference
Voltage
EN
BYP
OUT
FAULT
Thermal
Sensor
Error
Amplifier
Current
Amplifier
Under-
voltage
Lockout
ACTIVE SHUTDOWN
GND
February 2005
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M9999-020305
MIC5252
Micrel, Inc.
No-Load Stability
Applications Information
The MIC5252 will remain stable and in regulation with no
load unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5252 comes with an active-high enable pin that al-
lows the regulator to be disabled. Forcing the enable pin low
disables theregulator andsendsitintoa“zero”off-mode-cur-
rent state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables
the output voltage. This part is CMOS and the enable pin
cannot be left floating; a floating enable pin may cause an
indeterminate state on the output.
Thermal Considerations
The MIC5252 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 dis-
sipation of the package, use the junction-to-ambient thermal
resistance of the device and the following basic equation:
Input Capacitor
T (max) − T
The MIC5252 is a high performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for opti-
mal performance. A 1µF capacitor is required from the input
to ground to provide stability. Low-ESR ceramic capacitors
provide optimal performance at a minimum of space. Addi-
tional high-frequency capacitors, such as small valued NPO
dielectric type capacitors, help filter out high frequency noise
and are good practice in any RF based circuit.
J
A
P (max) =
D
θ
JA
T (max) 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 MIC5252.
J
A
JA
Package
θ
JA Recommended
θJA 1” Square
θJC
Minimum Footprint
Copper Clad
Output Capacitor
SOT-23-5
(M5 or D5)
235°C/W
185°C/W
145°C/W
The MIC5252 requires an output capacitor for stability. The
designrequires1µForgreaterontheoutputtomaintainstabil-
ity.Thedesignisoptimizedforusewithlow-ESRceramicchip
capacitors. High ESR capacitors may cause high frequency
oscillation. The maximum recommended ESR is 300mΩ.
The output capacitor can be increased, but performance has
been optimized for a 1µF ceramic output capacitor and does
not improve significantly with larger capacitance.
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can be
determined using the equation:
P = (V – V
) I
+ V I
IN GND
D
IN
OUT OUT
Substituting P (max) for P and solving for the operating
D
D
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For
example, when operating the MIC5252-2.8BM5 at 50°C with
a minimum footprint layout, the maximum input voltage for a
set output current can be determined as follows:
X7R/X5R dielectric-type ceramic capacitors are recom-
mendedbecauseoftheirtemperatureperformance.X7R-type
capacitors change capacitance by 15% over their operating
temperature range and are the most stable type of ceramic
capacitors. Z5U and Y5V dielectric capacitors change value
by as much as 50% and 60%, respectively, over their operat-
ing temperature ranges. To use a ceramic chip capacitor with
Y5V dielectric, the value must be much higher than an X7R
ceramic capacitor to ensure the same minimum capacitance
over the equivalent operating temperature range.
125°C − 50°C
235°C/W
P (max) =
D
P (max) = 315mW
D
The junction-to-ambient thermal resistance for the minimum
footprint is 235°C/W, from Table 1. The maximum power dis-
sipation must not be exceeded for proper operation. Using
the output voltage of 2.8V and an output current of 150mA,
the maximum input voltage can be determined. Because this
deviceisCMOSandthegroundcurrentistypically100µAover
theloadrange,thepowerdissipationcontributedbytheground
current is <1% and can be ignored for this calculation.
Bypass Capacitor
A capacitor is required from the noise bypass pin to ground
to reduce output voltage noise. The capacitor bypasses
the internal reference. A 0.01µF capacitor is recommended
for applications that require low-noise outputs. The bypass
capacitor can be increased, further reducing noise and im-
proving PSRR. Turn-on time increases slightly with respect
to bypass capacitance. A unique quick-start circuit allows
the MIC5252 to drive a large capacitor on the bypass pin
without significantly slowing turn-on time. Refer to the “Typi-
cal Characteristics” section for performance with different
bypass capacitors.
315mW = (V – 2.8V)150mA
IN
315mW = V × 150mA – 420mW
IN
735mW = V × 150mA
IN
V (max) = 4.9V
IN
Therefore, a 2.8V application at 150mA of output current
can accept a maximum input voltage of 4.9V in a SOT-23-5
package. For a full discussion of heat sinking and thermal
effects on voltage regulators, refer to the “Regulator Ther-
mals” sectionofMicrel’sDesigningwithLow-DropoutVoltage
Regulators handbook.
Active Shutdown
The MIC5252 also features an active shutdown clamp, which
is an N-Channel MOSFET that turns on when the device is
disabled. This allows the output capacitor and load to dis-
charge, de-energizing the load.
M9999-020305
8
February 2005
MIC5252
Micrel, Inc.
Package Information
SOT-23-5 (M5)
6-Pin MLF™ (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
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.
© 2003 Micrel Incorporated
February 2005
9
M9999-020305
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