MIC5250 [MICREL]
Dual 150mA レCap CMOS LDO Regulator Preliminary Information; 双150毫安レ章CMOS LDO稳压器的初步信息
| 型号： | MIC5250 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Dual 150mA レCap CMOS LDO Regulator Preliminary Information |
| 文件： | 总12页 (文件大小：170K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5250
Dual 150mA µCap CMOS LDO Regulator
Preliminary Information
General Description
Features
The MIC5250 is an efficient, precise dual CMOS voltage
regulator optimized for ultra-low-noise applications. The
MIC5250offersbetterthan1%initialaccuracy,extremelylow
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.
• 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
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.
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
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.
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V and V regulation/switching
CC
PP
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number
Voltage Junction Temp. Range
Package
MIC5250-2.7BMM
MIC5250-2.8BMM
MIC5250-3.0BMM
MIC5250-3.3BMM
2.7V
2.8V
3.0V
3.3V
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
10-lead MSOP
10-lead MSOP
10-lead MSOP
10-lead MSOP
Other voltages available. Contact Micrel for details.
Typical Application
MIC5250-3.3BMM
10
OUTA
3.3V
COUTA
9
2
1
3
VINA
INA
BYPA
CBYPA
(optional)
ENABLE
ENA GNDA
SHUTDOWN
7
5
8
4
6
VINB
INB
OUTB
3.3V
COUTB
ENABLE
SHUTDOWN
ENB BYPB
GNDB
CBYPB
(optional)
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
ENA
1
2
3
4
5
10 OUTA
9
8
7
6
INA
GNDA
BYPB
ENB
OUTB
INB
GNDB
MIC5250-x.xBMM
Pin Description
Pin Number
9 / 7
Pin Name
INA / B
Pin Function
Supply Input*
Ground*
3 / 6
GNDA / B
ENA / B
2 / 4
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
1 / 4
BYPA / B
Reference Bypass: Connect external 0.01µF capacitor to GND to reduce
output noise. May be left open.
10 / 8
OUTA / B
Regulator Output
* Supply inputs and grounds are fully isolated.
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Input Voltage (V ) .................................. 0V to +7V
Input Voltage (V ) ......................................... +2.7V to +6V
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
J
Junction Temperature (T ) ...................................... +150°C
J
Thermal Resistance (θ )......................................200°C/W
JA
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
MIC5250
2
March 2000
MIC5250
Micrel
Electrical Characteristics
Each regulator: 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 = 0mA
–1
–2
1
2
%
%
∆VLNR
Line Regulation
VIN = VOUT + 0.1V to 6V
IOUT = 0.1mA to 150mA, Note 4
IOUT = 100µA
–0.3
0
0.3
3.0
5
%/V
%
∆VLDR
Load Regulation
2.0
1.5
50
VIN – VOUT
Dropout Voltage, Note 5
mV
mV
mV
IOUT = 50mA
85
IOUT = 100mA
100
150
150
I
OUT = 150mA
200
250
mV
mV
IQ
Quiescent Current
V
EN ≤ 0.4V (shutdown)
0.2
100
100
50
1
µA
µA
IGND
Ground Pin Current, Note 6
IOUT = 0mA
150
IOUT = 150mA
µA
PSRR
ILIM
Power Supply Rejection
Current Limit
f = 120Hz, COUT = 10µF, CBYP = 0.01µF
VOUT = 0V
dB
160
300
30
mA
en
Output Voltage Noise
COUT = 10µF, 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
0.8
1
0.4
V
V
2.0
V
IL ≤ 0.4V
IH ≥ 2.0V
0.17
1.5
500
µA
µA
Ω
V
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
°C
°C
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4. 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.
Note 5. 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.
Note 6. 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.
March 2000
3
MIC5250
MIC5250
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
100
100
80
60
40
20
0
100
80
60
40
20
0
VIN = 4V
IOUT = 10mA
OUT = 1µF tant
IOUT = 100µA
VIN = 4V
OUT = 3V
IOUT = 100mA
COUT = 1µF tant
VIN = 4V
VOUT = 3V
V
OUT = 3V
C
COUT = 1µF tant
V
80
60
40
20
0
1E+11E+21E+31E+41E+51E+61E+7
1E+11E+21E+31E+41E+51E+61E+7
1k 10k
1k 10k
1M
1M
10M
100k
10 100
100k
FREQUENCY (Hz)
10M
10 100
1E+11E+21E1+k31E+41E+51E+6 E+7
10k 1M
10 100
100k
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
100
100
100
VIN = 4V
OUT = 3V
VIN = 4V
VOUT = 3V
IOUT = 150mA
OUT = 1µF tant
V
C
80
60
40
20
0
80
60
40
20
0
80
60
40
20
0
IOUT = 10mA
IOUT = 100µA
COUT = 10µF cer.
BYP = 0.01µF
VIN = 4V
OUT = 3V
C
OUT = 10µF cer.
BYP = 0.01µF
C
V
C
1E+11E+21E+31E+41E+51E+61E+7
1E+11E+21E+31E+41E+51E+61E+7
1k 10k
1M
1E+11E+21E+31E+41E+51E+6 E+7
10
10 100
100k
FREQUENCY (Hz)
10M
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
10
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Power Supply Ripple Rejection
vs. Voltage Drop
100
100
80
100µA 10mA
VIN = 4V
OUT = 3V
VIN = 4V
VOUT = 3V
70
V
80
60
40
20
0
80
60
40
20
0
60
50
40
30
150mA
IOUT = 150mA
OUT = 10µF cer.
BYP = 0.01
IOUT = 100mA
20
IOUT = 100mA
C
C
OUT = 10µF cer.
BYP = 0.01µF
10
C
COUT = 1µF
C
0
1E+11E+21E+31E+41E+51E+61E+7
100 1k 10k 100k 1M 10M
0
200 400 600 800 1000
VOLTAGE DROP (mV)
1E+11E+21E+31E+41E+51E+61E+7
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
10
10
FREQUENCY (Hz)
Power Supply Ripple Rejection
vs. Voltage Drop
Noise Performance
Noise Performance
80
10
1
10
IL = 100µA
IL = 100µA
70
IOUT = 100mA
100mA
60
1
0.1
50
40
30
20
10
0
10mA
VIN = 4V
OUT = 3V
VIN = 4V
0.1
V
V
OUT = 3V
COUT = 1µF cer.
BYP = 0.01µF
100µA
COUT = 10µF cer.
BYP = 0.01µF
COUT = 10µF cer.
BYP = 0.01µF
C
C
C
0.01
0.01
0
200 400 600 800 1000
VOLTAGE DROP (mV)
10
100
1k 10k 100k 1M
10
1k 10k
1M
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
FREQUENCY (Hz)
100
100k
1E+1 1E+2 1E+3 E+4 E+5 1E+6
FREQUENCY (Hz)
MIC5250
4
March 2000
MIC5250
Micrel
Ground Pin Current
Ground Pin Current
95
90
85
200
150
100
50
VIN = 4V
OUT = 3V
VIN = 4V
VOUT = 3V
V
IOUT = 100µA
0
0.1
1
10
100 500
-40 -20
0
20 40 60 80 100
LOAD CURRENT (mA)
TEMPERATURE (°C)
Ground Pin Current
Ground Pin Current
Ground Pin Current
150
100
100
VIN = 4V
OUT = 3V
VOUT = 3V
VOUT = 3V
V
125
100
75
75
50
25
0
75
50
25
0
IOUT = 150mA
IOUT = 150mA
IOUT = 100µA
50
-40 -20
0
20 40 60 80 100
0
1
2
3
4
5
0
1
2
3
4
5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout Characteristics
Dropout Voltage
Dropout Voltage
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
8
300
250
200
150
100
50
IL = 150mA
VOUT = 3V
ILOAD = 100µA
RL = 30kΩ
6
4
2
0
RL = 30Ω
0
0
1
2
3
4
5
-40 -20
0
20 40 60 80 100120140
-40 -20
0
20 40 60 80 100120140
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
Dropout Voltage
Short Circuit Current
300
250
200
150
100
50
600
500
400
300
200
100
0
3.05
3.00
2.95
2.90
2.85
VIN = 4V
TYPICAL 3V DEVICE
TA = 125°C
TA = 25°C
VIN = 3.5V
V
EN = 3V
ILOAD = 100µA
TA = -40°C
0
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
-40 -20
0
20 40 60 80 100120140
-50
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
March 2000
5
MIC5250
MIC5250
Micrel
Enable Pin Bias Current
Enable Threshold Voltage
4
3
2
1
0
2.0
1.5
1.0
0.5
0
VIN = 4.0V
VIN = 4.0V
VEN = 100mV
-40 -20
0
20 40 60 80 100120140
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
Functional Characteristics
Line Transient Response
Load Transient Response
6V
4V
150mA
VIN = 4V
VOUT = 3V
COUT = 10µF cer.
CBYP = 0.01µF
VOUT = 3V
COUT = 10µF
CBYP = 0.01µF
IOUT = 100µA
100µA
TIME (10ms/div.)
TIME (100µs/div.)
Enable Pin Delay
Shutdown Delay
VIN = 4V
VOUT = 3V
COUT = 10µF
CBYP = 0.01µF
IOUT = no load
VOUT = 3V
COUT = 10µF
CBYP = 0.01µF
IOUT = no load
TIME (20µs/div.)
TIME (1ms/div.)
MIC5250
6
March 2000
MIC5250
Micrel
Crosstalk
Crosstalk
Characteristics
Characteristics
VOUTB = 3.3V
COUTB = 10µF
VOUTB = 3.3V
COUTB = 10µF
CBYPB = 0
CBYPB = 0
ILOAD = 100µA
ILOAD = 100µA
VOUTA = 3.3V
COUTA = 10µF
CBYPA = 0
VOUTA = 3.3V
COUTA = 10µF
CBYPA = 0
VIN = 4.3V
separate supplies
V
IN = 4.3V
common supply
I
LOAD = 100µA
I
LOAD = 100µA
ILOAD = 150mA
ILOAD = 150mA
TIME (25µs/div.)
TIME (25µs/div.)
Block Diagrams
INA
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Reference
Voltage
ENA
BYPA
OUTA
PULL
UP
FAULT
Thermal
Sensor
Error
Amplifier
Current
Amplifier
Under-
voltage
Lockout
PULL
DOWN
ACTIVE SHUTDOWN
GNDA
INB
Startup/
Shutdown
Control
Quickstart/
Reference
Voltage
Noise
Cancellation
ENB
BYPB
OUTB
PULL
UP
FAULT
Thermal
Sensor
Error
Amplifier
Current
Amplifier
Under-
voltage
Lockout
PULL
DOWN
ACTIVE SHUTDOWN
GNDB
March 2000
7
MIC5250
MIC5250
Micrel
Thermal Considerations
Applications Information
The MIC5250 is a dual LDO voltage regulator designed to
provide two output voltages from one package. Both regula-
tor outputs are capable of sourcing 150mA of output current.
Proper thermal evaluation needs to be done to ensure that
the junction temperature does not exceed it’s maximum
value, 125°C. Maximum power dissipation can be calculated
basedontheoutputcurrentandthevoltagedropacrosseach
regulator. The sum of the power dissipation of each regulator
determines the total power dissipation. The maximum power
dissipation that this package is capable of handling can be
determined using thermal resistance, junction to ambient,
and the following basic equation:
Enable/Shutdown
The MIC5250 comes with active-high enable pins that allows
either regulator to be disabled. Forcing an enable pin low
disables the respective regulator and places it into a “zero”
off-mode-currentstate. Inthisstate, currentconsumedbythe
regulator goes nearly to zero. Forcing an enable pin high
enables the output voltage. This part is CMOS therefore the
enable pin cannot be left floating; a floating enable pin may
cause an indeterminate state on the output.
Input Capacitor
Input capacitors are not required for stability. A 1µF input
capacitor is recommended for either regulator when the bulk
ac supply capacitance is more than 10 inches away from the
device, or when the supply is a battery.
T
−T
A
J(max)
P
=
D(max)
θ
JA
Output Capacitor
T
is the maximum junction temperature of the die,
J(max)
The MIC5250 requires output capacitors for stability. The
design requires 1µF or greater on each output to maintain
stability. Capacitors can be low-ESR ceramic chip capaci-
tors. The MIC5250 has been designed to work specifically
withlow-cost,smallchipcapacitors.Tantalumcapacitorscan
also be used for improved capacitance over the operating
temperature range. The value of the capacitor can be in-
creased without bounds.
125°CandT istheambientoperatingtemperatureofthedie.
A
θ
is layout dependent. Table 1 shows the typical thermal
JA
resistance for a minimum footprint layout for the MIC5250.
θ
at Recommended
Minimum Footprint
JA
Package
MSOP-10
200° C/W
Table 1. Thermal Resistance
Bypass Capacitor
The actual power dissipation of each regulator output can be
calculated using the following simple equation:
Capacitors can be placed from each noise bypass pin to their
respective ground to reduce output voltage noise. These
capacitors bypass the internal references. A 0.01µF capaci-
tor is recommended for applications that require low-noise
outputs.
P
= V −V
I
+V I
IN GND
(
)
D
IN
OUT OUT
Each regulator contributes power dissipation to the overall
power dissipation of the package.
Transient Response
P
= P
+P
D(total)
D(reg1) D(reg2)
The MIC5250 implements a unique output stage design
which dramatically improves transient response recovery
time. The output is a totem-pole configuration with a P-
channel MOSFET pass device and an N-channel MOSFET
clamp. The N-channel clamp is a significantly smaller device
that prevents the output voltage from overshooting when a
heavy load is removed. This feature helps to speed up the
transient response by significantly decreasing transient re-
sponse recovery time during the transition from heavy load
(100mA) to light load (100µA).
Each output is rated for 150mA of output current, but the
application may limit the amount of output current based on
the total power dissipation and the ambient temperature.
A typical application may call for two 3.0V outputs from a
single Li-ion battery input. This input can be as high as 4.2V.
When operating at high ambient temperatures, the output
current may be limited. When operating at an ambient of
60°C, the maximum power dissipation of the package is
calculated as follows:
Active Shutdown
125°C − 60°C
Each regulator 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 discharge, de-energizing the load.
P
=
D(max)
200°C/W
P
= 325mW
D(max)
Cross Talk
Fortheapplicationmentionedabove,ifregulator1issourcing
150mA, it contributes the following to the overall power
dissipation:
When a load transient occurs on one output of the MIC5250,
the second output may couple a small amount of ripple to its
output. This typically comes from a common input source or
from poor grounding. Using proper grounding techniques
such as star grounding as well as good bypassing directly at
the inputs of each regulator will help to reduce the magnitude
of the cross talk. See “Functional Characteristics” for an
example of cross talk performance.
P
= V −V
I
+V I
IN GND
(
)
D(reg1)
IN
OUT OUT
P
= 4.2V − 3.0V 150mA + 4.2V ×100µA
(
)
D(reg1)
PD(reg1) = 180.4mW
MIC5250
8
March 2000
MIC5250
Micrel
Since the total power dissipation allowable is 325mW, the
Fixed Regulator Applications
maximumpowerdissipationofthesecondregulatorislimited
to:
MIC5250-3.3BMM
10
OUTA
3.3V
1µF
9
2
1
3
PD(max) = PD(reg1) +PD(reg2)
VINA
INA
BYPA
0.01µF
0.01µF
ENA GNDA
325mW = 180.4mW +P
D(reg2)
7
5
8
4
6
VINB
INB
OUTB
3.3V
1µF
ENB BYPB
GNDB
P
= 144.6mW
D(reg2)
The maximum output current of the second regulator can be
calculated using the same equations but solving for the
output current (ground current is constant over load and
simplifies the equation):
Figure 1. Ultra-Low-Noise Dual 3.3V Application
Figure 1 includes 0.01µF capacitors for low-noise operation
and shows EN (pin 3) connected to IN (pin 1) for an applica-
PD(reg2) = V −VOUT
I
+VIN IGND
OUT
(
)
IN
tions where enable/shutdown is not required. C
minimum.
= 1µF
OUT
144.6mW = 4.2V − 3.0V I
+ 4.2V ×100µA
(
)
OUT
MIC5250-3.3BMM
IOUT = 120.5mA
10
OUTA
BYPA
3.3V
1µF
9
2
1
3
VINA
INA
The second output is limited to 120mA due to the total power
dissipation of the system when operating at 60°C ambient
temperature.
ENA GNDA
7
5
8
4
6
VINB
INB
OUTB
3.3V
1µF
ENB BYPB
GNDB
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration where
C
is not required. C
= 1µF minimum.
BYP
OUT
Dual-Supply Operation
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.
March 2000
9
MIC5250
MIC5250
Micrel
Package Information
3.15 (0.122)
2.85 (0.114)
DIMENSIONS:
MM (INCH)
4.90 BSC (0.193)
3.10 (0.122)
2.90 (0.114)
1.10 (0.043)
0.94 (0.037)
0.26 (0.010)
0.10 (0.004)
0.30 (0.012)
0.15 (0.006)
0.15 (0.006)
0.05 (0.002)
6° MAX
0° MIN
0.70 (0.028)
0.40 (0.016)
0.50 BSC (0.020)
10-Lead MSOP (MM)
MIC5250
10
March 2000
MIC5250
Micrel
March 2000
11
MIC5250
MIC5250
Micrel
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
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC5250
12
March 2000
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MIC5250-3.3BMM
Fixed Positive LDO Regulator, 2 Output, 3.3V1, 3.3V2, CMOS, PDSO10, MSOP-10
MICROCHIP
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