MIC5252-3.0YMLTR [MICREL]
3V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO6, 2 X 2 MM, LEAD FREE, MLF-6;
| 型号： | MIC5252-3.0YMLTR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 3V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO6, 2 X 2 MM, LEAD FREE, MLF-6 |
| 文件： | 总9页 (文件大小：88K) |
| 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 pro-
vides 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. A noise 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 de-
vices, the MIC5252 provides a TTL-logic-compatible enable
pin.Whendisabled,powerconsumptiondropsnearlytozero.
• 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
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.
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
Typical Application
VOUT
COUT
VIN
MIC5252-x.xBML
MIC5252-x.xBM5
VIN
VOUT
ENABLE
SHUTDOWN
C
IN = 1.0µF
Ceramic
1
2
3
5
6
5
4
1
2
3
EN
CBYP
(optional)
COUT = 1.0µF
Ceramic
4
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C
BYP = 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. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
M0394-121003
December 2003
1
MIC5252
Micrel
Ordering Information
Part Number
Marking Voltage
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
Package
SOT-23-5
MIC5252-1.8BM5
MIC5252-2.5BM5
MIC5252-2.8BM5
MIC5252-2.85BM5
MIC5252-3.0BM5
MIC5252-4.75BM5
MIC5252-2.8BML
MIC5252-2.85BML
MIC5252-3.0BML
L618
L625
L628
L62J
L630
L64H
628
1.8V
2.5V
SOT-23-5
2.8V
SOT-23-5
2.85V
3.0V
SOT-23-5
SOT-23-5
4.75V
2.8V
SOT-23-5
6-Pin 2×2 MLF™
6-Pin 2×2 MLF™
6-Pin 2×2 MLF™
62J
2.85V
3.0V
630
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3
2
1
6
5
4
BYP
EN
GND
IN
1
L6xx
NC
2
3
4
5
OUT
BYP
OUT
MIC5252-x.xBML
6-Pin 2mm × 2mm MLF™ (ML)
MIC5252-x.xBM5
SOT-23-5 (M5)
(Top View)
(Top View)
Pin Description
Pin Number
SOT-23-5
Pin Number
6-MLF™
Pin Name
Pin Function
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.
M0394-121003
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December 2003
MIC5252
Micrel
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
IN
EN
EN
(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
%
%
∆VLNR
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
0.05
1.5
5
%/V
%
∆VLDR
VIN – VOUT
mV
mV
IOUT = 100mA
150
IOUT = 150mA
135
200
250
mV
mV
IQ
Quiescent Current
V
EN ≤ 0.4V (shutdown)
0.2
90
1
µA
µA
IGND
Ground Pin Current(8)
IOUT = 0mA
150
200
IOUT = 150mA
117
63
µA
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
dB
48
dB
48
dB
ILIM
en
Current Limit
250
425
30
mA
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
0.4
V
V
1.6
V
IL ≤ 0.4V, regulator shutdown
IH ≥ 1.6V, regulator enabled
0.01
0.01
500
1
1
µA
µA
Ω
V
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 T (ambient temperature) is P (max) = (T (max)–T )/θ . Exceeding the maximum allowable
A
D
J
A
JA
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ of the MIC5252-x.xBM5 (all
JA
versions) 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 current.
December 2003
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M0394-121003
MIC5252
Micrel
Typical Characteristics
PSRR with Bypass Variation
PSRR with Bypass Cap
PSRR with Load 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
COUT = 1µF Ceramic
COUT = 1µF Ceramic
BYP = 10nF
VIN = VOUT + 1V
OUT = 2.8V
COUT = 1µF Ceramic
IN = VOUT + 0.3V
VOUT = 2.8V
VIN = VOUT + 1V
C
V
VOUT = 2.8V
Load = 150mA
V
Load = 150mA
10k
10k
100
1k
100k 1M
10k
1k
100k 1M
1k
100k 1M
100
10
100
10
10
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR
at 100Hz
Output Voltage
vs. Load Current
Output Voltage
vs. Temperature
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
COUT = 1µF
BYP = 10nF
OUT 2.8V
C
V
2.8VOUT
100µA
20 40 60 80 100 120
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
-40 -20 0
TEMPERATURE (°C)
VOLTAGE DROP (mV)
Ground Current
vs. Output Current
Ground Current
vs. Temperature
Ground Current
vs. Supply Voltage
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
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Ground Current
Dropout Characteristics
Dropout
vs. Temperature
vs. Supply Voltage
140
120
100
80
3
2.5
2
200
180
160
140
120
100
80
100µA
10mA Load
150mA
150mA Load
1.5
1
60
60
40
40
2.8VOUT
IL = 150mA
0.5
20
20
0
0
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
M0394-121003
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December 2003
MIC5252
Micrel
Dropout
vs. Output Current
Enable Threshold
vs. Supply Voltage
Enable Threshold
vs. Temperature
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
Enable On
Enable 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)
2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2
SUPPLY VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Short Circuit Current
vs. Input Supply 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)
December 2003
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M0394-121003
MIC5252
Micrel
Functional Characteristics
Enable Pin 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
50mA Load
TIME (10µs/div)
M0394-121003
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December 2003
MIC5252
Micrel
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
December 2003
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M0394-121003
MIC5252
Micrel
No-Load Stability
Applications Information
TheMIC5252willremainstableandinregulationwithnoload
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
allowstheregulatortobedisabled.Forcingtheenablepinlow
disables the regulator and sends it into a “zero” off-mode-
current 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 indetermi-
nate 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
dissipation of the package, use the junction-to-ambient ther-
malresistanceofthedeviceandthefollowingbasicequation:
Input Capacitor
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.
TJ(max)− TA
PD(max) =
θJA
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
θJA Recommended θJA 1" Square
Minimum Footprint
θJC
Output Capacitor
Copper Clad
The MIC5252 requires an output capacitor for stability. The
design requires 1µF or greater on the output to maintain
stability. The design is optimized for use with low-ESR
ceramic chip 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.
SOT-23-5
(M5 or D5)
235°C/W
185°C/W
145°C/W
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-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their oper-
ating temperature range and are the most stable type of
ceramiccapacitors.Z5UandY5Vdielectriccapacitorschange
value by as much as 50% and 60%, respectively, over their
operatingtemperatureranges. Touseaceramicchipcapaci-
torwithY5Vdielectric, thevaluemustbemuchhigherthanan
X7R ceramic capacitor to ensure the same minimum capaci-
tance over the equivalent operating temperature range.
125°C − 50°C
PD(max) =
235°C/W
P (max) = 315mW
D
The junction-to-ambient thermal resistance for the minimum
footprint is 235°C/W, from Table 1. The maximum power
dissipationmustnotbeexceededforproperoperation. Using
the output voltage of 2.8V and an output current of 150mA,
the maximum input voltage can be determined. Because this
device is CMOS and the ground current is typically 100µA
over the load range, the power dissipation contributed by the
groundcurrentis< 1%andcanbeignoredforthiscalculation.
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 ca-
pacitor can be increased, further reducing noise and improv-
ing 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 “Typical Char-
acteristics” 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
effectsonvoltageregulators,refertothe“RegulatorThermals”
sectionofMicrel’sDesigningwithLow-DropoutVoltageRegu-
lators 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.
M0394-121003
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December 2003
MIC5252
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)
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
Rev. 02
SIDE VIEW
6-Pin MLF™ (ML)
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
The 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
December 2003
9
M0394-121003
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