MIC5208-5.0BMM [MICREL]
Dual 50mA LDO Voltage Regulator Preliminary Information; 双50毫安LDO稳压器的初步信息
| 型号： | MIC5208-5.0BMM |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Dual 50mA LDO Voltage Regulator Preliminary Information |
| 文件： | 总6页 (文件大小：58K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5208
Dual 50mA LDO Voltage Regulator
Preliminary Information
General Description
Features
The MIC5208 is a dual linear voltage regulator with very low • Micrel Mini 8™ MSOP package
dropout voltage (typically 20mV at light loads and 250mV at • Guaranteed 50mA output
50mA), very low ground current (225µA at 10mA output), and • Low quiescent current
better than 3% initial accuracy. It also features individual • Low dropout voltage
logic-compatible enable/shutdown control inputs.
• Wide selection of output voltages
• Tight load and line regulation
• Low temperature coefficient
• Current and thermal limiting
• Reversed input polarity protection
• Zero off-mode current
Designed especially for hand-held battery powered devices,
the MIC5208 can be switched by a CMOS or TTL compatible
logic signal, or the enable pin can be connected to the supply
input for 3-terminal operation. When disabled, power con-
sumption drops nearly to zero. Dropout ground current is
minimized to prolong battery life.
• Logic-controlled electronic enable
Key features include current limiting, overtemperature shut-
down, and protection against reversed battery.
Applications
The MIC5208 is available in 3.0V, 3.3V, 3.6V, 4.0V and 5.0V
fixed voltage configurations. Other voltages are available;
contact Micrel for details.
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery powered equipment
• Bar code scanners
• SMPS post regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number
Voltage
3.0
Accuracy Junction Temp. Range*
Package
MIC5208-3.0BMM
MIC5208-3.3BMM
MIC5208-3.6BMM
MIC5208-4.0BMM
MIC5208-5.0BMM
3%
3%
3%
3%
3%
–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
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
3.3
3.6
4.0
5.0
Other voltages available. Contact Micrel for details.
Typical Application
MIC5208
1
2
3
4
8
7
6
5
Output A
Output B
Enable A
Enable B
1µF
1µF
Enable may be connected to V
IN
3-168
1997
MIC5208
Micrel
Pin Configuration
1
2
3
4
8
7
6
5
OUTA
GND
INA
ENA
INB
OUTB
GND
ENB
MIC5208BMM
Pin Description
Pin Number
Pin Name
OUTA
GND
Pin Function
1
2, 4
3
Regulator Output A
Ground: Both pins must be connected together.
Regulator Output B
OUTB
ENB
5
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
3
6
7
INB
Supply Input B
ENA
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
8
INA
Supply Input A
1997
3-169
MIC5208
Micrel
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Input Voltage (V ) ............................ –20V to +20V Supply Input Voltage (V ) ............................... 2.5V to 16V
IN
IN
Enable Input Voltage (V ) ........................... –20V to +20V Enable Input Voltage (V ) ................................. 0V to 16V
EN
EN
Power Dissipation (P ) ............................ Internally Limited
Junction Temperature (T ) ....................... –40°C to +125°C
D
J
Storage Temperature Range ................... –60°C to +150°C 8-lead MSOP (θ ) ................................................... Note 1
JA
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Electrical Characteristics
VIN = VOUT + 1V; IL = 1mA; CL = 1µF, and VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C to +125°C;
for one-half of dual MIC5208; unless noted.
Symbol
Parameter
Conditions
Min Typical Max
Units
VO
Output Voltage
Accuracy
variation from nominal VOUT
–3
–4
3
4
%
%
∆VO/∆T
∆VO/VO
∆VO/VO
Output Voltage
Temperature Coeffcient
Note 2
50
200 ppm/°C
Line Regulation
VIN = VOUT +1V to 16V
IL = 0.1mA to 50mA, Note 3
0.008
0.08
0.3
0.5
%
%
Load Regulation
0.3
0.5
%
%
V
IN – VO
Dropout Voltage, Note 4
IL = 100µA
IL = 20mA
IL = 50mA
20
200
250
mV
mV
mV
350
500
IQ
Quiescent Current
VEN ≤ 0.4V (shutdown)
0.01
10
µA
IGND
Ground Pin Current
Note 5
V
EN ≥ 2.0V (enabled), IL = 100µA
180
225
850
µA
µA
µA
IL = 20mA
IL = 50mA
750
1200
IGNDDO
Ground Pin Current at Dropout
Current Limit
VIN = 0.5V less than designed VOUT, Note 5
200
180
0.05
300
250
µA
mA
ILIMIT
VOUT = 0V
∆VO/∆PD
Control Input
Thermal Regulation
Note 6
%/W
Input Voltage Level
Logic Low
Logic High
VIL
VIH
shutdown
enabled
0.6
V
V
2.0
IIL
IIH
Control Input Current
V
V
IL ≤ 0.6V
IH ≥ 2.0V
0.01
15
1
50
µA
µA
General Note: Devices are ESD protected, however, handling precautions are recommended.
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum
junction temperature, T
, the junction-to-ambient thermal resistance, θ , and the ambient temperature, T . The maximum allowable
J(max)
JA
A
power dissipation at any ambient temperature is calculated using: P
= (T
– T ) / θ . Exceeding the maximum allowable power
MAX
J(max)
A
JA
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. θ of the 8-lead MSOP is 200°C/W,
JA
mounted on a PC board.
Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects
are covered by the thermal regulation specification.
Note 4: 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 5: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
Note 6: Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 50mA load pulse at V = 16V for t = 10ms.
IN
3-170
1997
MIC5208
Micrel
Typical Characteristics
Dropout Voltage
vs. Temperature
Dropout Characteristics
(MIC5208-3.3)
Dropout Voltage
vs. Output Current
1000
400
300
200
100
0
4
3
2
1
0
CIN = 10µF
OUT = 1µF
CIN = 10µF
OUT = 1µF
C
C
IL = 100µA
100
10
1
IL = 50mA
IL = 50mA
IL = 100µA
IL = 1mA
CIN = 10µF
C
OUT = 1µF
0.01
0.1
1
10
100
-60 -30
0
30 60 90 120 150
0
1
2
3
4
5
6
7
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
Ground Current
vs. Temperature
Ground Current
vs. Output Current
2000
1500
1000
500
0
2.0
1.5
1.0
0.5
0.0
3.0
2.5
2.0
1.5
1.0
0.5
0.0
CIN = 10µF
OUT = 1µF
IL = 50mA
C
3
VOUT = 3.3V
IL = 100µA
IL = 50mA
IL = 100µA
VIN = VOUT + 1V
0
10 20 30 40 50 60 70 80
OUTPUT CURRENT (mA)
0
1
2
3
4
5
6
7
-60 -30
0
30 60 90 120 150
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Output Current
Short Circuit Current
vs. Input Voltage
Thermal Regulation
(MIC5208-3.3)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
160
140
120
100
80
60
40
20
0
-20
-40
CIN = 10µF
OUT = 1µF
C
-6
100
60
50
0
CIN = 10µF
40
C
OUT = 1µF
20
CL = 1µF
0
-50
-2
0
50
100
150
200
0
1
2
3
4
5
6
7
0
2
4
6
8
10 12 14 16
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
TIME (ms)
Output Voltage
vs. Temperature
Short Circuit Current
vs. Temperature
Minimum Supply Voltage
vs. Temperature
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
200
180
160
140
120
100
3.5
3.4
3.3
CIN = 10µF
C
OUT = 1µF
IL = 1mA
V
= 3.3V
OUT
CIN = 10µF
3 DEVICES
C
OUT = 1µF
HI / AVG / LO
CIN = 10µF
OUT = 1µF
CURVES APPLICABLE
C
AT 100µA AND 50mA
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1997
3-171
MIC5208
Micrel
Typical Characteristics
Output Impedance
Load Transient
Load Transient
1000
200
0
100
0
100
IL = 100µA
COUT = 10µF
COUT = 1µF
IN = VOUT + 1
-200
-1400
50
-100
-1200
50
V
IN = VOUT + 1
10
V
IL = 1mA
1
IL = 50mA
0.1
0
0
0.01
-50
-1
-50
-5
0
1
2
3
4
5
6
7
8
0
5
10
15
20
TIME (ms)
TIME (ms)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
Line Transient
(MIC5208-3.3)
Line Transient
(MIC5208-3.3)
100
3
2
2
1
CL = 1µF
CL = 11µF
I
L = 1mA
80
60
1
I
L = 1mA
0
0
-1
-28
-81
6
40
IL = 100µA
6
4
2
CL = 1µF
20
0
4
V
IN = VOUT + 1
2
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
TIME (ms)
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
TIME (ms)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
Enable Characteristics
(MIC5208-3.3)
Enable Characteristics
(MIC5208-3.3)
100
80
60
40
20
0
4.0
5
4
3
2
1
0
3.0
2.0
1.0
0.0
-1.40
CL = 1µF
L = 100µA
CL = 1µF
I
IL = 100µA
-41
IL = 1mA
L = 1µF
IN = VOUT + 1
2
0
2
0
C
V
-2
-2
-2
0
2
4
6
8
10
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
TIME (ms)
TIME (µs)
FREQUENCY (Hz)
Enable Voltage
vs. Temperature
Enable Current
vs. Temperature
Ripple Voltage
vs. Frequency
1.50
1.25
1.00
0.75
0.50
40
100
80
60
40
20
0
CIN = 10µF
OUT = 1µF
L = 1mA
CIN = 10µF
OUT = 1µF
IL = 1mA
C
C
30
20
10
0
I
VEN = 5V
VON
VOFF
IL = 50mA
L = 1µF
IN = VOUT + 1
VEN = 2V
C
V
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
3-172
1997
MIC5208
Micrel
No-Load Stability
Applications Information
The MIC5208 will remain stable and in regulation with no load
(other than the internal voltage divider) unlike many other
voltageregulators. ThisisespeciallyimportantinCMOSRAM
keep-alive applications.
Supply/Ground
Both MIC5208 GND pins must be connected to the same
ground potential. INA and INB can each be connected to a
different supply.
Thermal Shutdown
Enable/Shutdown
Thermal shutdown is independent on both halves of the dual
MIC5208, however, an overtemperature condition in one half
may affect the other half because of proximity.
ENA (enable/shutdown) and ENB may be enabled sepa-
rately. Forcing ENA/B high (> 2V) enables the associated
regulator. ENA/B requires a small amount of current, typically
15µA. While the logic threshold is TTL/CMOS compatible,
Thermal Considerations
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
ENA/B may be forced as high as 20V, independent of V .
IN
Input Capacitor
A 0.1µF capacitor should be placed from IN to GND if there is
more than 10 inches of wire between the input and the ac filter
capacitor or if a battery is used as the input.
The MIC5208-xxBMM (8-lead MSOP) has a thermal resis-
tance of 200°C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.
Output Capacitor
PC Board
Dielectric
θJA
An output capacitor is required between OUT and GND to
prevent oscillation. Larger values improve the regulator’s
transient response. The output capacitor value may be in-
creased without limit.
FR4
200°C
MSOP Thermal Characteristics
3
The output capacitor should have an ESR (effective series
resistance) of about 5Ω or less and a resonant frequency
above 500kHz. Most tantalum or aluminum electrolytic ca-
pacitors are adequate; film types will work, but are more
expensive. Since many aluminum electrolytics have electro-
lytes that freeze at about –30°C, solid tantalums are recom-
mended for operation below –25°C.
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.22µF for current below 10mA or 0.1µF for currents below
1mA.
1997
3-173
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