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1997 1 MIC5208
MIC5208 Micrel
MIC5208
Dual 50mA LDO Regulator
Final Information
General Description
The MIC5208 is a dual linear voltage regulator with very low
dropout voltage (typically 20mV at light loads and 250mV at
50mA), very low ground current (225µA at 10mA output), and
better than 3% initial accuracy. It also features individual
logic-compatible enable/shutdown control inputs.
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.
Key features include current limiting, overtemperature shut-
down, and protection against reversed battery.
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.
Features
• Micrel Mini 8™ MSOP package
• Guaranteed 50mA output
• Low quiescent current
• Low dropout voltage
• 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
• Logic-controlled electronic enable
Applications
• 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
1
2
3
4
8
7
6
5
Output A
MIC5208
1µF
Enable may be connected to VIN
Enable A
Enable B
1µF
Output B
Typical Application
Ordering Information
Part Number Voltage Accuracy Junction Temp. Range* Package
MIC5208-3.0BMM 3.0 3% –40°C to +125°C 8-lead MSOP
MIC5208-3.3BMM 3.3 3% –40°C to +125°C 8-lead MSOP
MIC5208-3.6BMM 3.6 3% –40°C to +125°C 8-lead MSOP
MIC5208-4.0BMM 4.0 3% –40°C to +125°C 8-lead MSOP
MIC5208-5.0BMM 5.0 3% –40°C to +125°C 8-lead MSOP
Other voltages available. Contact Micrel for details.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
3333
CECE
MIC5208 2 1997
MIC5208 Micrel
Pin Configuration
1
2
3
4
8
7
6
5
INA
ENA
INB
ENB
OUTA
GND
OUTB
GND
MIC5208BMM
Pin Description
Pin Number Pin Name Pin Function
1 OUTA Regulator Output A
2, 4 GND Ground: Both pins must be connected together.
3 OUTB Regulator Output B
5 ENB Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
6 INB Supply Input B
7 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 MIC5208
MIC5208 Micrel
Absolute Maximum Ratings
Supply Input Voltage (VIN) ............................ –20V to +20V
Enable Input Voltage (VEN) ........................... –20V to +20V
Power Dissipation (PD) ............................ Internally Limited
Storage Temperature Range ................... –60°C to +150°C
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
VOOutput Voltage variation from nominal VOUT –33%
Accuracy –4 4 %
∆VO/∆T Output Voltage Note 2 50 200 ppm/°C
Temperature Coeffcient
∆VO/VOLine Regulation VIN = VOUT +1V to 16V 0.008 0.3 %
0.5 %
∆VO/VOLoad Regulation IL = 0.1mA to 50mA, Note 3 0.08 0.3 %
0.5 %
VIN – VODropout Voltage, Note 4 IL = 100µA20mV
IL = 20mA 200 350 mV
IL = 50mA 250 500 mV
IQQuiescent Current VEN ≤ 0.4V (shutdown) 0.01 10 µA
IGND Ground Pin Current VEN ≥ 2.0V (enabled), IL = 100µA 180 µA
Note 5 IL = 20mA 225 750 µA
IL = 50mA 850 1200 µA
IGNDDO Ground Pin Current at Dropout VIN = 0.5V less than designed VOUT, Note 5 200 300 µA
ILIMIT Current Limit VOUT = 0V 180 250 mA
∆VO/∆PDThermal Regulation Note 6 0.05 %/W
Control Input
Input Voltage Level
VIL Logic Low shutdown 0.6 V
VIH Logic High enabled 2.0 V
IIL Control Input Current VIL ≤ 0.6V 0.01 1 µA
IIH VIH ≥ 2.0V 15 50 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, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable
power dissipation at any ambient temperature is calculated using: PMAX = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. θJA of the 8-lead MSOP is 200°C/W,
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 VIN = 16V for t = 10ms.
Recommended Operating Conditions
Supply Input Voltage (VIN) ............................... 2.5V to 16V
Enable Input Voltage (VEN) ................................. 0V to 16V
Junction Temperature (TJ) ....................... –40°C to +125°C
8-lead MSOP (θJA) ................................................... Note 1
MIC5208 4 1997
MIC5208 Micrel
1
10
100
1000
0.01 0.1 1 10 100
DROPOUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
CIN = 10µF
COUT = 1µF
0
100
200
300
400
-60 -30 0 30 60 90 120 150
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 100µA
I
L
= 1mA
I
L
= 50mA
0
1
2
3
4
01234567
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Dropout Characteristics
(MIC5208-3.3)
I
L
= 50mA
I
L
= 100µA
C
IN
= 10µF
C
OUT
= 1µF
0
500
1000
1500
2000
0 1020304050607080
GROUND CURRENT (µA)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
VIN = VOUT + 1V
0.0
0.5
1.0
1.5
2.0
01234567
GROUND CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
L
= 50mA
I
L
= 100µAV
OUT
= 3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-60 -30 0 30 60 90 120 150
GROUND CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Temperature
I
L
= 50mA
I
L
= 100µA
C
IN
= 10µF
C
OUT
= 1µF
Typical Characteristics
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 50 100 150 200
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
C
IN
= 10µF
C
OUT
= 1µF
Output Voltage
vs. Output Current
0
20
40
60
80
100
120
140
160
01234567
SHORT CIRCUIT CURRENT (mA)
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
CIN = 10µF
COUT = 1µF
-60
-40
-20
0
20
40
60
∆ OUTPUT (mV)
-50
0
50
100
-2 0 2 4 6 8 10 12 14 16
LOAD (mA)
TIME (ms)
Thermal Regulation
(MIC5208-3.3)
CL = 1µF
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
-60 -30 0 30 60 90 120 150
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
CURVES APPLICABLE
AT 100µA AND 50mA
3 DEVICES
HI / AVG / LO
100
120
140
160
180
200
-60 -30 0 30 60 90 120 150
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
CIN = 10µF
COUT = 1µF
3.3
3.4
3.5
-60 -30 0 30 60 90 120 150
MIN. SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Minimum Supply Voltage
vs. Temperature
IL = 1mA
VOUT = 3.3V
CIN = 10µF
COUT = 1µF
1997 5 MIC5208
MIC5208 Micrel
Typical Characteristics
0.01
0.1
1
10
100
1000
1x10
0
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
OUTPUT IMPEDANCE (Ω)
FREQUENCY (Hz)
Output Impedance
IL = 100µA
IL = 1mA
IL = 50mA
-400
-200
0
200
∆ OUTPUT (mV)
-50
0
50
100
-1 012345678
OUTPUT (mA)
TIME (ms)
Load Transient
C
OUT
= 1µF
V
IN
= V
OUT
+ 1
-50
0
50
100
-5 0 5 10 15 20
OUTPUT (mA)
TIME (ms)
-200
-100
0
100
∆ OUTPUT (mV)
Load Transient
C
OUT
= 10µF
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 100µA
C
L
= 1µF
V
IN
= V
OUT
+ 1
-2
-1
0
1
2
3
∆ OUTPUT (V)
2
4
6
8
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
INPUT (V)
TIME (ms)
Line Transient
(MIC5208-3.3)
C
L
= 1µF
I
L
= 1mA
-1
0
1
2
3
4
5
OUTPUT (V)
-2
0
2
4
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
ENABLE (V)
TIME (ms)
Enable Characteristics
(MIC5208-3.3)
CL = 1µF
IL = 100µA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 50mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
0.50
0.75
1.00
1.25
1.50
-60 -30 0 30 60 90 120 150
ENABLE VOLTAGE (mV)
TEMPERATURE (°C)
Enable Voltage
vs. Temperature
CIN = 10µF
COUT = 1µF
IL = 1mA
VON
VOFF
0
10
20
30
40
-60 -30 0 30 60 90 120 150
ENABLE CURRENT (µA)
TEMPERATURE (°C)
Enable Current
vs. Temperature
CIN = 10µF
COUT = 1µF
IL = 1mA
VEN = 5V
VEN = 2V
-1
0
1
2
∆ OUTPUT (V)
2
4
6
8
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
INPUT (V)
TIME (ms)
Line Transient
(MIC5208-3.3)
C
L
= 11µF
I
L
= 1mA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 1mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
-1.0
0.0
1.0
2.0
3.0
4.0
OUTPUT (V)
-2
0
2
4
-2 0246810
ENABLE (V)
TIME (µs)
Enable Characteristics
(MIC5208-3.3)
CL = 1µF
IL = 100µA
MIC5208 6 1997
MIC5208 Micrel
No-Load Stability
The MIC5208 will remain stable and in regulation with no load
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS RAM
keep-alive applications.
Thermal 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.
Thermal Considerations
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
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.
PC Board θJA
Dielectric
FR4 200°C
MSOP Thermal Characteristics
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
Applications Information
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.
Enable/Shutdown
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,
ENA/B may be forced as high as 20V, independent of VIN.
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.
Output Capacitor
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.
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.
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.
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1997 7 MIC5208
MIC5208 Micrel
Package Information
0.008 (0.20)
0.004 (0.10) 0.039 (0.99)
0.035 (0.89)
0.021 (0.53)
0.012 (0.03) R
0.0256 (0.65) TYP
0.012 (0.30) R
5° MAX
0° MIN
0.122 (3.10)
0.112 (2.84)
0.120 (3.05)
0.116 (2.95)
0.012 (0.03)
0.007 (0.18)
0.005 (0.13)
0.043 (1.09)
0.038 (0.97)
0.036 (0.90)
0.032 (0.81)
DIMENSIONS:
INCH (MM)
0.199 (5.05)
0.187 (4.74)
8-Pin MSOP (MM)
MIC5208 8 1997
MIC5208 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.
© 1997 Micrel Incorporated
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