MIC5250
Micrel
MIC5250
Dual 150mA
µ
Cap CMOS LDO Regulator
Preliminary Information
General Description
The MIC5250 is an efficient, precise dual CMOS voltage
regulator optimized for ultra-low-noise applications. The
MIC5250 offers better than 1% initial accuracy, extremely low
dropout voltage (typically 150mV at 150mA) and constant
ground current over load (typically 100µA). The MIC5250
provides a very-low-noise output, ideal for RF applications
where quiet voltage sources are required. A noise bypass pin
is also available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5250 provides TTL logic compatible enable
pins. When disabled, power consumption drops nearly to
zero.
The MIC5250 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, push-
pull outputs for faster transient response, and active clamps
to speed up device turnoff. Available in the 10-lead MSOP
(micro-shrink-outline package), the MIC5250 also offers a
range of fixed output voltages.
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30µV(rms)
• Stability with ceramic, tantalum, or aluminum electrolytic
capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
• “Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
•
•
•
•
•
•
•
•
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
PCMCIA V
CC
and V
PP
regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Ordering Information
Part Number
MIC5250-2.7BMM
MIC5250-2.8BMM
MIC5250-3.0BMM
MIC5250-3.3BMM
Voltage
2.7V
2.8V
3.0V
3.3V
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
10-lead MSOP
10-lead MSOP
10-lead MSOP
10-lead MSOP
Other voltages available. Contact Micrel for details.
Typical Application
MIC5250-3.3BMM
OUTA
V
INA
ENABLE
SHUTDOWN
9
2
10
1
3
3.3V
C
BYPA
(optional)
C
OUTA
INA
ENA
INB
ENB
BYPA
GNDA
OUTB
BYPB
GNDB
V
INB
ENABLE
SHUTDOWN
7
5
8
4
6
3.3V
C
BYPB
(optional)
C
OUTB
ENA may be connected directly to INA.
ENB may be connected directly to INB.
GNDA and GND B may be connected to
isolated grounds or the same ground.
Dual Ultra-Low-Noise Regulator Circuit
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
March 2000
1
MIC5250
MIC5250
Micrel
Pin Configuration
BYPA 1
ENA 2
GNDA 3
BYPB 4
ENB 5
10 OUTA
9 INA
8 OUTB
7 INB
6 GNDB
MIC5250-x.xBMM
Pin Description
Pin Number
9/7
3/6
2/4
1/4
10 / 8
Pin Name
INA / B
GNDA / B
ENA / B
BYPA / B
OUTA / B
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 capacitor to GND to reduce
output noise. May be left open.
Regulator Output
* Supply inputs and grounds are fully isolated.
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage (V
IN
) .................................. 0V to +7V
Enable Input Voltage (V
EN
) ................................. 0V to +7V
Junction Temperature (T
J
) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD,
Note 3
Operating Ratings
(Note 2)
Input Voltage (V
IN
) ......................................... +2.7V to +6V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... –40°C to +125°C
Thermal Resistance
(θ
JA
)...................................... 200°C/W
MIC5250
2
March 2000
MIC5250
Micrel
Electrical Characteristics
Each regulator: 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 noted.
Symbol
V
O
∆V
LNR
∆V
LDR
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage,
Note 5
Conditions
I
OUT
= 0mA
V
IN
= V
OUT
+ 0.1V to 6V
I
OUT
= 0.1mA to 150mA,
Note 4
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
I
Q
I
GND
PSRR
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
V
IH
≥
2.0V
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
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.
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.
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
–2
–0.3
Typical
Max
1
2
Units
%
%
%/V
%
mV
mV
mV
mV
mV
µA
µA
µA
dB
mA
µV(rms)
0
2.0
1.5
50
100
150
0.2
100
100
50
0.3
3.0
5
85
150
200
250
1
150
Quiescent Current
Ground Pin Current,
Note 6
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 150mA
f = 120Hz, C
OUT
= 10µF, C
BYP
= 0.01µF
V
OUT
= 0V
C
OUT
= 10µF, C
BYP
= 0.01µF,
f = 10Hz to 100kHz
160
Power Supply Rejection
Current Limit
Output Voltage Noise
300
30
0.8
2.0
1
0.17
1.5
500
0.4
V
V
µA
µA
Ω
°C
°C
150
10
March 2000
3
MIC5250
MIC5250
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
100
I
OUT
= 100µA
C
OUT
= 1µF tant
80
PSRR (dB)
60
40
20
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
IN
= 4V
V
OUT
= 3V
PSRR (dB)
100
I
OUT
= 10mA
80 C
OUT
= 1µF tant
60
40
20
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
IN
= 4V
V
OUT
= 3V
Power Supply
Rejection Ratio
100
Power Supply
Rejection Ratio
I
OUT
= 100mA
80 C
OUT
= 1µF tant
PSRR (dB)
60
40
20
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
IN
= 4V
V
OUT
= 3V
Power Supply
Rejection Ratio
100
I
OUT
= 150mA
80 C
OUT
= 1µF tant
PSRR (dB)
60
40
20
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
IN
= 4V
V
OUT
= 3V
PSRR (dB)
100
80
Power Supply
Rejection Ratio
100
80
PSRR (dB)
60
40
20
Power Supply
Rejection Ratio
V
IN
= 4V
V
OUT
= 3V
60
40
I
OUT
= 100µA
20 V = 4V
C
OUT
= 10µF cer.
IN
V
OUT
= 3V
C
BYP
= 0.01µF
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
I
OUT
= 10mA
C
OUT
= 10µF cer.
C
BYP
= 0.01µF
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Power Supply
Rejection Ratio
100
80
PSRR (dB)
60
40
20
I
OUT
= 100mA
C
OUT
= 10µF cer.
C
BYP
= 0.01µF
V
IN
= 4V
V
OUT
= 3V
PSRR (dB)
100
80
60
40
20
Power Supply
Rejection Ratio
RIPPLE REJECTION (dB)
V
IN
= 4V
V
OUT
= 3V
Power Supply Ripple Rejection
vs. Voltage Drop
80
70
60
50
40
30
20
10
0
0
150mA
I
OUT
= 100mA
C
OUT
= 1µF
200 400 600 800 1000
VOLTAGE DROP (mV)
100µA
10mA
I
OUT
= 150mA
C
OUT
= 10µF cer.
C
BYP
= 0.01
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
10M
10 100 1k 10k 100k 1M
1E+7
FREQUENCY (Hz)
Power Supply Ripple Rejection
vs. Voltage Drop
80
RIPPLE REJECTION (dB)
70
60
50
40
30
20
10
0
0
100µA
C
OUT
= 10µF cer.
C
BYP
= 0.01µF
200 400 600 800 1000
VOLTAGE DROP (mV)
10mA
100mA
I
OUT
= 100mA
Noise Performance
10
I
L
= 100µA
NOISE (µV/√Hz)
1
NOISE (µV/√Hz)
1
10
Noise Performance
I
L
= 100µA
V
IN
= 4V
0.1 V
OUT
= 3V
C
OUT
= 1µF cer.
C
BYP
= 0.01µF
0.01
10
100
1k 10k
1E+5
1M
1E+1 1E+2 1E+3 1E+4
100k
1E+6
FREQUENCY (Hz)
V
IN
= 4V
0.1 V
OUT
= 3V
C
OUT
= 10µF cer.
C
BYP
= 0.01µF
0.01
1k 10k 100k 1M
10
100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
FREQUENCY (Hz)
MIC5250
4
March 2000
MIC5250
Micrel
Ground Pin Current
95
QUIESCENT CURRENT (µA)
V
IN
= 4V
V
OUT
= 3V
QUIESCENT CURRENT (µA)
200
Ground Pin Current
V
IN
= 4V
V
OUT
= 3V
150
90
100
50
I
OUT
= 100µA
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
85
0.1
1
10
100
LOAD CURRENT (mA)
500
Ground Pin Current
150
QUIESCENT CURRENT (µA)
V
IN
= 4V
V
OUT
= 3V
QUIESCENT CURRENT (µA)
100
Ground Pin Current
100
V
OUT
= 3V
75
QUIESCENT CURRENT (µA)
Ground Pin Current
V
OUT
= 3V
75
125
100
50
50
75
I
OUT
= 150mA
50
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
25
I
OUT
= 100µA
0
0
1
2
3
4
INPUT VOLTAGE (V)
5
25
I
OUT
= 150mA
1
2
3
4
INPUT VOLTAGE (V)
5
0
0
Dropout Characteristics
3.5
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
1
2
3
4
INPUT VOLTAGE (V)
5
V
OUT
= 3V
R
L
= 30kΩ
R
L
= 30Ω
8
Dropout Voltage
300
I
LOAD
= 100µA
6
DROPOUT VOLTAGE (mV)
250
200
150
100
50
Dropout Voltage
I
L
= 150mA
4
2
0
-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Dropout Voltage
300
DROPOUT VOLTAGE (mV)
250
200
150
100
50
0
0
T
A
= -40°C
25 50 75 100 125 150
OUTPUT CURRENT (mA)
T
A
= 125°C
T
A
= 25°C
OUTPUT CURRENT (mA)
600
500
400
300
200
100
Short Circuit Current
3.05
OUTPUT VOLTAGE (V)
Output Voltage
vs. Temperature
V
IN
= 4V
TYPICAL 3V DEVICE
3.00
V
IN
= 3.5V
V
EN
= 3V
2.95
2.90
I
LOAD
= 100µA
2.85
-50
0
50
100
TEMPERATURE (°C)
150
0
-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
March 2000
5
MIC5250
模拟与混合信号
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