MIC5253
Micrel
MIC5253
100mA Low Noise
µ
Cap Teeny™ LDO
General Description
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.
Designed specifically for handheld and battery-powered de-
vices, the MIC5253 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5253 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
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.
Features
•
•
•
•
•
•
•
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
•
•
•
•
Applications
•
•
•
•
•
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
Typical Application
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
IN
MIC5253-x.xBC5
1
2
3
4
5
V
OUT
C
OUT
= 1.0µF
Ceramic
C
BYP
= 0.01µF
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
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
1
M9999-112305
MIC5253
Micrel
Ordering Information
Standard
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
Part Number
Voltage*
Marking Pb-Free
Marking**
1.5V
715
MIC5253-1.5YC5
715
1.8V
718
MIC5253-1.8YC5
718
1.85V
71J
MIC5253-1.85YC5
71J
2.5V
725
MIC5253-2.5YC5
725
2.6V
726
MIC5253-2.6YC5
726
2.7V
727
MIC5253-2.7YC5
727
2.8V
728
MIC5253-2.8YC5
728
2.9V
729
MIC5253-2.9YC5
729
3.0V
730
MIC5253-3.0YC5
730
3.1V
731
MIC5253-3.1YC5
731
3.2V
732
MIC5253-3.2YC5
732
3.3V
733
MIC5253-3.3YC5
733
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
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
* Other voltage options available. Contact Micrel Marketing for details.
** Under bar symbol ( _ ) may not be to scale.
Pin Configuration
EN
GND
3
2
2
IN
1
7xx
4
5
BYP
OUT
SC-70-5 (C5)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
IN
GND
EN
BYP
OUT
Pin Function
Supply Input.
Ground.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown.
Do not leave open.
Reference Bypass: Connect external 0.01µF
≤
C
BYP
≤
1.0µF capacitor to GND to reduce output
noise. May be left open.
Regulator Output.
M9999-112305
2
November
2005
MIC5253
Micrel
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) .................................. 0V to +7V
Enable Input Voltage (V
EN
) ................................. 0V to +7V
Power Dissipation (P
D
) ........................ Internally Limited
(3)
Junction Temperature (T
J
) ....................... –40°C to +125°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD Rating
(4) ................................................................................
2kV
Operating Ratings
(2)
Input Voltage (V
IN
) ...................................... +2.7V to +5.5V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... –40°C to +125°C
Thermal Resistance
SC-70-5
(θ
JA
) .................................................... 400°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V, V
EN
= V
IN;
I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless otherwise noted.
Symbol
V
O
∆V
LNR
∆V
LDR
V
IN
– V
OUT
I
Q
I
GND
PSRR
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
Conditions
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 100mA,
Note 6
I
OUT
= 50mA
I
OUT
= 100mA
Quiescent Current
Ground Pin Current
(8)
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 100mA
Ripple Rejection
f = 100Hz, C
OUT
= 1.0µF, C
BYP
= 0.1µF
f = 1kHz, V
IN
= V
OUT
+1, C
BYP
= 0.1µF
f = 10kHz, V
IN
= V
OUT
+1, C
BYP
= 0.1µF
t
ON
I
LIM
e
n
Enable Input
V
IL
V
IH
I
EN
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
V
IN
= 2.7V to 5.5V, regulator shutdown
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤
0.4V, regulator shutdown
V
IH
≥
1.6V, regulator enabled
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
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 T
A
(ambient temperature) is P
D(max)
= (T
J(max)
–T
A
)/θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
JA
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.
Min
–1.5
–3
Typical
Max
1.5
3
Units
%
%
%/V
%
mV
mV
µA
µA
µA
dB
dB
dB
µs
mA
µV(rms)
0.035
1.5
80
165
0.2
75
90
66
70
65
30
0.05
2.5
150
300
1
100
150
Turn-On Time
Current Limit
Output Voltage Noise
V
OUT
= 0V
C
OUT
= 1.0µF, C
BYP
= 0.01µF,
f = 10Hz to 100kHz
150
150
450
250
30
0.4
1.6
0.01
0.01
V
V
µA
µA
°C
°C
150
10
November
2005
3
M9999-112305
MIC5253
Micrel
Typical Characteristics
Power Supply Rejection Ratio
80
70
60
PSRR (dB)
Power Supply Rejection Ratio
80
GROUND CURRENT (µA)
Ground Pin Current
88
87
86
85
84
83
82
81
0
V
OUT
=1.8V
V
IN
= V
OUT
+ 1V
25 50 75 100 125 150
OUTPUT CURRENT (mA)
70
60
PSRR (dB)
50
40
30
20
100µA
1mA
10mA
50
100µA
1mA
30
10mA
100mA
20
V
OUT
= 1.8V C
OUT
= 1µF
10
C
BYP
= 0.01µF
V
IN
= 2.8V
0
10k
100k
1k
100
FREQUENCY (Hz)
40
100mA
V
OUT
= 1.8V C
OUT
= 1µF
10 V = 2.8V
C
BYP
= 0.1µF
IN
0
1k
10k
100k
100
FREQUENCY (Hz)
1M
1M
Ground Pin Current
90
GROUND CURRENT (µA)
GROUND CURRENT (µA)
Ground Pin Current
84
82
80
78
76
74
72
I
= 100µA
GROUND CURRENT (µA)
80
70
60
50
40
30
20
10
0
0
Ground Pin Current
88
86
84
82
80
78
76
74
72
I
= 100mA
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
LOAD
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
LOAD
I
LOAD
= 100µA
1
2
3
4
INPUT VOLTAGE (V)
5
Ground Pin Current
90
GROUND CURRENT (µA)
Dropout Characteristics
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE (mV)
2
1.8
1.6
Dropout Voltage
250
80
70
60
50
40
30
20
10
0
0
I
LOAD
= 100mA
5
1
2
3
4
INPUT VOLTAGE (V)
1.4
I
LOAD
= 100µA
1.2
1
0.8
0.6
0.4
0.2
V
= 1.85V
OUT
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
I
LOAD
= 100mA
200
150
100
50
V
IN
= 3.6V
V
OUT
= 2.6V
I
LOAD
= 100mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Dropout Voltage
SHORT CIRCUIT CURRENT (mA)
350
DROPOUT VOLTAGE (mV)
Short Circuit Current
2.7
Output Voltage
vs. Temperature
OUTPUT VOLTAGE (V)
290
270
250
230
210
190
170
150
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9
INPUT VOLTAGE (V)
2.65
300
250
200
150
100
50
0
0
–40°C
25°C
125°C
V
IN
= 3.6V
V
OUT
= 2.6V
25 50 75 100 125 150
OUTPUT CURRENT (mA)
2.6
2.55
2.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
I
= 100µA
LOAD
V
OUT
= 2.6V
V
IN
= 3.6V
M9999-112305
4
November
2005
MIC5253
Micrel
Functional Characteristics
Line Transient Response
Output Voltage
(20mV/div)
Load Transient Response
Input Voltage
(1V/div)
5V
4V
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
I
OUT
= 100µA
100mA
Output Current
(50mA/div)
Output Voltage
(50mV/div)
100µA
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
V
IN
= 4V
TIME (500µs/div)
TIME (5µs/div)
Enable Pin Delay
Enable Voltage
(1V/div)
Shutdown Delay
Enable Voltage
(1V/div)
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
I
OUT
= 100µA
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
V
IN
= 4V
Output Voltage
(500mV/div)
Output Voltage
(500mV/div)
TIME (5µs/div)
TIME (500µs/div)
November
2005
5
M9999-112305
嵌入式系统
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