MIC5253-3.3YC5TR [MICROCHIP]
3.3V FIXED POSITIVE LDO REGULATOR, 0.3V DROPOUT, PDSO5, LEAD FREE, SC-70, 5 PIN;
| 型号： | MIC5253-3.3YC5TR |
| 厂家： | 
MICROCHIP |
| 描述： | 3.3V FIXED POSITIVE LDO REGULATOR, 0.3V DROPOUT, PDSO5, LEAD FREE, SC-70, 5 PIN 光电二极管 |
| 文件： | 总9页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5253
100mA Low Noise µCap Teeny™ LDO
General Description
Features
The MIC5253 is an efficient, CMOS voltage regulator opti-
mized for ultra-low-noise applications. It offers 1.5% initial
accuracy, extremely low dropout voltage (165mV at 100mA),
and low ground current (typically 95µA at full load). The
MIC5253 provides a very low noise output, ideal for RF
applications where a clean voltage source is required. A
noise bypass pin is also available for further reduction of
output noise.
• Input voltage range: 2.7V to 5.5V
• Teeny™ SC-70-5 package
• Ultra-low output noise: 30µV(rms)
• 100mA continuous output current, 150mA peak current
• Stability with ceramic output capacitors
• Ultralow dropout: 165mV @ 100mA
• High output accuracy:
1.5% initial accuracy
3.0% over temperature
• Low ground current: 95µA
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
Designed specifically for handheld and battery-powered de-
vices, the MIC5253 provides a TTL-logic-compatible enable
pin.Whendisabled,powerconsumptiondropsnearlytozero.
The MIC5253 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
Available in the Teeny™ SC-70-5 package, the MIC5253
offers a wide range of output voltages. Key features include
current limit, thermal shutdown, faster transient response,
and an active clamp to speed up device turn-off.
Typical Application
MIC5253-x.xBC5
VIN
EN
VOUT
CIN = 1.0µF
1
2
3
5
Ceramic
COUT = 1.0µF
Ceramic
4
Enable
Shutdown
EN (pin 3) may be
connected directly
to IN (pin 1).
C
BYP = 0.01µF
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2005
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MIC5253
Micrel
Ordering Information
Junction
Temp. Range
Part Number
Marking Pb-Free
Voltage*
Package
Standard
Marking**
715
MIC5253-1.5BC5
MIC5253-1.8BC5
MIC5253-1.85BC5
MIC5253-2.5BC5
MIC5253-2.6BC5
MIC5253-2.7BC5
MIC5253-2.8BC5
MIC5253-2.9BC5
MIC5253-3.0BC5
MIC5253-3.1BC5
MIC5253-3.2BC5
MIC5253-3.3BC5
715
718
71J
725
726
727
728
729
730
731
732
733
MIC5253-1.5YC5
1.5V
1.8V
1.85V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
–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
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
SC-70-5
MIC5253-1.8YC5
MIC5253-1.85YC5
MIC5253-2.5YC5
MIC5253-2.6YC5
MIC5253-2.7YC5
MIC5253-2.8YC5
MIC5253-2.9YC5
MIC5253-3.0YC5
MIC5253-3.1YC5
MIC5253-3.2YC5
MIC5253-3.3YC5
718
71J
725
726
727
728
729
730
731
732
733
* Other voltage options available. Contact Micrel Marketing for details.
** Under bar symbol ( _ ) may not be to scale.
Pin Configuration
EN
3
IN
1
GND
2
7xx
4
5
BYP
OUT
SC-70-5 (C5)
Pin Description
Pin Number
Pin Name
Pin Function
Supply Input.
Ground.
1
2
3
IN
GND
EN
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown.
Do not leave open.
4
5
BYP
OUT
Reference Bypass: Connect external 0.01µF ≤ CBYP ≤ 1.0µF capacitor to GND to reduce output
noise. May be left open.
Regulator Output.
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MIC5253
Micrel
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (V ) .................................. 0V to +7V
Input Voltage (V ) ...................................... +2.7V to +5.5V
IN
IN
Enable Input Voltage (V ) .................................. 0V to V
Enable Input Voltage (V ) ................................. 0V to +7V
EN
IN
EN
Junction Temperature (T ) ....................... –40°C to +125°C
(3)
J
Power Dissipation (P ) ........................ Internally Limited
D
Thermal Resistance
Junction Temperature (T ) ....................... –40°C to +125°C
J
SC-70-5 (θ ) ....................................................400°C/W
JA
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
(4)
ESD Rating ................................................................................ 2kV
Electrical Characteristics(5)
VIN = VOUT + 1V, VEN = VIN; OUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless otherwise noted.
I
Symbol
Parameter
Conditions
Min Typical Max
Units
VO
Output Voltage Accuracy
IOUT = 100µA
–1.5
–3
1.5
3
%
%
∆VLNR
Line Regulation
Load Regulation
Dropout Voltage(7)
VIN = VOUT + 1V to 6V
IOUT = 0.1mA to 100mA, Note 6
IOUT = 50mA
0.035
1.5
80
0.05
2.5
150
300
1
%/V
%
∆VLDR
VIN – VOUT
mV
mV
µA
IOUT = 100mA
165
0.2
75
IQ
Quiescent Current
VEN ≤ 0.4V (shutdown)
IGND
Ground Pin Current(8)
IOUT = 0mA
100
150
µA
IOUT = 100mA
90
µA
PSRR
Ripple Rejection
f = 100Hz, COUT = 1.0µF, CBYP = 0.1µF
f = 1kHz, VIN = VOUT +1, CBYP = 0.1µF
f = 10kHz, VIN = VOUT +1, CBYP = 0.1µF
66
dB
70
dB
65
dB
tON
ILIM
en
Turn-On Time
30
150
450
µs
Current Limit
VOUT = 0V
150
250
30
mA
µV(rms)
Output Voltage Noise
COUT = 1.0µF, CBYP = 0.01µF,
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
µA
µA
V
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
°C
°C
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
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 MIC5253-x.xBC5 (all versions) is
400°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 100mA. 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 differential.
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.
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Typical Characteristics
Power Supply Rejection Ratio
Power Supply Rejection Ratio
Ground Pin Current
80
80
88
87
86
85
84
83
82
81
70
60
70
60
50
40
30
20
10
0
50
100µA
100µA
1mA
40
30
20
10
0
1mA
10mA
10mA
100mA
100mA
VOUT = 1.8V
IN = 2.8V
COUT = 1µF
CBYP = 0.1µF
VOUT = 1.8V
IN = 2.8V
COUT = 1µF
BYP = 0.01µF
V
OUT =1.8V
V
C
VIN = VOUT + 1V
V
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
10k
100k
100
1k
10k
100k
1M
100
1k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
Ground Pin Current
Ground Pin Current
Ground Pin Current
90
84
80
70
60
50
40
30
20
10
0
88
86
84
82
80
78
76
74
72
70
82
80
78
76
74
72
70
ILOAD = 100µA
ILOAD = 100µA
ILOAD = 100mA
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
0
1
2
3
4
5
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Dropout Characteristics
Dropout Voltage
Ground Pin Current
2
1.8
1.6
1.4
1.2
1
250
200
150
100
50
90
80
70
60
50
40
30
20
10
0
ILOAD = 100mA
ILOAD = 100µA
0.8
0.6
0.4
0.2
0
VIN = 3.6V
V
OUT = 2.6V
ILOAD = 100mA
VOUT = 1.85V
ILOAD = 100mA
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
0
1
2
3
4
5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Output Voltage
vs. Temperature
Dropout Voltage
Short Circuit Current
350
300
250
200
150
100
50
2.7
2.65
2.6
290
270
250
230
210
190
170
150
–40°C
25°C
125°C
ILOAD = 100µA
OUT = 2.6V
IN = 3.6V
20 40 60 80 100 120
TEMPERATURE (°C)
2.55
2.5
V
VIN = 3.6V
V
OUT = 2.6V
V
0
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9
INPUT VOLTAGE (V)
-40 -20
0
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Micrel
Functional Characteristics
Line Transient Response
Load Transient Response
5V
4V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
C
BYP = 0.01µF
IOUT = 100µA
100mA
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = 4V
100µA
TIME (500µs/div)
TIME (5µs/div)
Enable Pin Delay
Shutdown Delay
CIN = 1µF Ceramic
COUT = 1µF Ceramic
C
BYP = 0.01µF
CIN = 1µF Ceramic
IOUT = 100µA
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = 4V
TIME (5µs/div)
TIME (500µs/div)
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MIC5253
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
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MIC5253
Micrel
No-Load Stability
Applications Information
TheMIC5253willremainstableandinregulationwithnoload
unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5253 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 MIC5253 is designed to provide 100mA of continuous
currentinaverysmallpackage. Maximumambientoperating
temperature can be calculated based on the output current
and the voltage drop across the part. Given that the input
voltage is 5.0V, the output voltage is 2.9V, and the output
current = 100mA.
Input Capacitor
The actual power dissipation of the regulator circuit can be
determined using the equation:
The MIC5253 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.
P = (V – V
) I
+ V I
IN GND
D
IN
OUT OUT
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power dissipation
contributed by the ground current is < 1% and can be ignored
for this calculation.
P = (5.0V – 2.9V) × 100mA
D
Output Capacitor
P = 0.21W
D
The MIC5253 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.
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resis-
tance of the device and the following basic equation:
T (max)− T
J
A
P (max) =
D
θ
JA
T (max) = 125°C, the max. junction temperture of the die
J
θ
thermal resistance = 400°C/W
JA
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.
Table 1 shows junction-to-ambient thermal resistance for the
MIC5253 in the SC-70 package.
Package
θJA Recommended
Minimum Footprint Copper Clad
400°C/W 325°C
θJA 1" Sq.
θJC
SC-70-5 (C5)
250°C/W
Table 1. Thermal Resistance
Substituting P for P (max) and solving for the ambient
D
D
Bypass Capacitor
operating temperature will give the maximum operating con-
ditions for the regulator circuit. The junction-to-ambient ther-
mal resistance for the minimum footprint is 400°C/W, from
Table 1. The maximum power dissipation must not be ex-
ceeded for proper operation.
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor by-
passes the internal reference. A 0.01µF capacitor is recom-
mended for applications that require low-noise outputs. The
bypass capacitor can be increased, further reducing noise
and improving PSRR. Turn-on time increases slightly with
respect to bypass capacitance. A unique quick-start circuit
allows the MIC5253 to drive a large capacitor on the bypass
pin without significantly slowing turn-on time. Refer to the
“Typical Characteristics” section for performance with differ-
ent bypass capacitors.
For example, when operating the MIC5253-2.9BC5 at an
input voltage of 5.0V and 100mA load with a minimum
footprint layout, the maximum ambient operating tempera-
ture T can be determined as follows:
A
125°C− TA
0.21W =
400°C/W
Active Shutdown
The MIC5253 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.
TA = 41°C
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MIC5253
Micrel
Therefore, a 2.9V application at 100mA of output current can
accept an ambient operating temperature of 41°C in a SC-70
package. For a full discussion of heat sinking and thermal
effectsonvoltageregulators,refertothe“RegulatorThermals”
sectionofMicrel’sDesigningwithLow-DropoutVoltageRegu-
lators handbook. This information can be found on Micrel's
website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
November 2005
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MIC5253
Micrel
Package Information
0.65 (0.0256) BSC
1.35 (0.053) 2.40 (0.094)
1.15 (0.045) 1.80 (0.071)
2.20 (0.087)
1.80 (0.071)
DIMENSIONS:
MM (INCH)
1.00 (0.039) 1.10 (0.043)
0.80 (0.032) 0.80 (0.032)
0.18 (0.007)
0.10 (0.004)
0.10 (0.004)
0.00 (0.000)
0.30 (0.012)
0.15 (0.006)
0.30 (0.012)
0.10 (0.004)
5-Pin SC-70-5 (C5)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 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.
© 2004 Micrel, Incorporated.
November 2005
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